Roj teeb Qib thiab Carbon Coated Aluminium Ntawv Nyiaj: Kev Qhia Txog Kev Qhia
Roj teeb txhuas ntawv ci yog lub cathode tam sim no collector nyob rau hauv lub lithium-ion cell - cov hlau substrate uas cov cathode active khoom yog coated rau., thiab qhov ntawd nqa tam sim no tawm ntawm electrode. Nws tsis muaj lub luag haujlwm electrochemical. Nws tsis khaws lub zog. Thiab precisely vim nws yog “inert”, nws yog ib qho yooj yim rau under-specify.
Qhov ntawd yog ib qho yuam kev. Cov ntawv sau tam sim no cuam tshuam rau kev cuam tshuam ntawm lub ntsej muag, txheej adhesion, tus nqi muaj peev xwm, lub neej voj voog, thiab tus nqi seem ntawm cov txheej txheej uas yuav khiav ntawm kaum ntawm meters ib feeb. Tau txais nws yuam kev yog kim nyob rau hauv ib txoj kev uas yog ib qho nyuaj rau taug qab mus rau cov ntawv ci.
Phau ntawv qhia no suav nrog kev xaiv alloy, ntsuas, npau taws sai, rooj plaub rau carbon txheej, thiab cov parameter tsim nyog muab tso rau hauv ib qho kev qhia tshwj xeeb.
Vim li cas txhuas rau cathode thiab tooj liab rau anode
Ib qho pib pib muaj txiaj ntsig, vim nws piav txog feem ntau ntawm cov qauv tsim logic:
| Cathode tam sim no collector | Anode tam sim no collector | |
| Khoom siv | Aluminium ntawv nyiaj | tooj liab ntawv ci |
| Ua li cas | Aluminium ua kom ruaj khov, passivating oxide txheej ntawm cathode muaj peev xwm, thiab yog lub teeb thiab pheej yig | Tooj liab yog ruaj khov ntawm qis (anode) muaj peev xwm tab sis yuav alloy nrog lithium |
| Qhov ntom | 2.7 g/cm³ | 8.96 g/cm³ |
Aluminium yog siv rau ntawm cathode vim tooj liab yuav oxidise ntawm cathode voltages, thiab aluminium vim tooj liab yuav txwv tsis pub hnyav. Yog tias koj tab tom nrhiav rau sodium-ion cell, nco ntsoov tias ob leeg electrodes tuaj yeem siv aluminium ntawv ci - sodium tsis alloy nrog aluminium lithium ua. Qhov no yog ib qho laj thawj vim li cas sodium-ion yog qhov txaus nyiam ntawm tus nqi, thiab nws yog qhov loj hlob ntawm cov roj teeb ntawv thov.
Base alloy xaiv
Cov ntawv ci roj teeb siv 1xxx series - kev lag luam ntshiab txhuas - vim tias kev coj ua thiab purity teeb meem ntau dua li lub zog.
| Alloy | Hom kev siv | Sau ntawv |
| 1235 | Feem ntau cov roj teeb foil alloy | ≥99.35% Al. Zoo sib npaug ntawm conductivity thiab nqi |
| 1060 | Siv dav, me ntsis siab dua purity | ≥99.60% Al |
| 1070 | Kev xav tau purity siab dua | ≥99.70% Al |
| 1050 | Siv nyob rau hauv ib co roj teeb thiab hluav taws xob ntawv ci | ≥99.50% Al |
| 1100 | Xaiv qhov twg yuav tsum muaj zog dua me ntsis | Muaj me Cu |
Ntsuas purity ntawm cov khoom siv feem ntau ua haujlwm siab tshaj qhov tshwj xeeb yam tsawg kawg nkaus - ≥99.0% specification feem ntau ntsuas ≥99.5% hauv kev xyaum.
Tswv yim tswv yim: tsis txhob tshaj qhia purity tshwj tsis yog tias koj cov electrode chemistry xav tau nws. Txhua kauj ruam purity raug nqi nyiaj, thiab 1235 ua haujlwm feem ntau ntawm kev lag luam cathode formulations.
Ntsuas: txoj kev, thiab lub siab mus thinner
Thinner foil txhais tau tias tsis tshua muaj zog hauv lub cell, uas txhais tau hais tias muaj zog ntau dua. Tag nrho kev lag luam raug thawb.
| Thickness | Txoj hauj lwm |
| 20 μm | Cov qauv qub, tseem siv qhov chaw tuav lub zog tseem ceeb |
| 18 μm | Kev saib xyuas, zoo txheej txheem stability |
| 16 μm | Feem ntau hauv ntim ntau lawm |
| 15 μm | Feem ntau rau siab zog ceev |
| 13 μm | Tam sim no lub ntsiab tseem ceeb rau cov hlwb muaj zog |
| 12 μm | Cov hlwb muaj zog heev, xav tau txheej txheem tswj |
| 10 μm thiab hauv qab no | Frontier, khoom siv tsawg |
Rau cov hlwb muaj zog-ntaus, 12- 15 m os yog qhov kev xaiv ib txwm muaj. Rau cov ntawv thov uas txheej txheej ruaj khov thiab tuav lub zog muaj teeb meem ntau dua li ob peb feem pua ntawm lub zog ceev, 18- 20 m os muab cov txheej txheem zoo dua thiab qis dua.
Kev sib pauv yog tiag tiag: raws li ntawv ci tau thinner nws wrinkles thiab stretches yooj yim dua ntawm kev kub ceev, tawg yooj yim dua ntawm khoov, thiab xav kom nruj dua ntsuas ntsuas los ntawm lub zeb. Yog tias koj cov kab txheej txheej tsis zoo-tuned, poob los ntawm 16 m ua to 13 μm tuaj yeem raug nqi koj ntau dua hauv cov khoom seem ntau dua li nws tau txais lub zog ceev.
Temper thiab mechanical zog
Roj teeb foil yuav tsum sib npaug ob hom tsis ua haujlwm. Ntws heev thiab nws wrinkles los yog stretches thaum lub sij hawm high-ceev txheej thiab winding. Nyuaj heev thiab nws tawg ntawm khoov thiab nyuaj rau cua.
| Kub | Hom tensile zog | Hom elongation | Hom kev siv |
| O (ib qho tseem ceeb) | 60-100 MPa | 3-15% | Daim ntawv thov xav tau ductility thiab tsim stability |
| H18 (tag nrho nyuaj) | 120-170 MPa | 1-4% | High-strength ntawv ci rau cov txheej txheem tswj kab |
| H19 | 140-190 MPa | 1-3% | Cov kev xav tau nruj dua |
Cov roj teeb feem ntau yog muab rau hauv H18. Qhov tseeb qhov tseem ceeb nyob ntawm alloy, ntsuas, dov txo thiab annealing tej yam kev mob - pom zoo cov cuab yeej cuab tam ntau yam contractually thiab xav kom nws tshaj tawm ntawm daim ntawv pov thawj cov khoom siv rau txhua qhov ntau lawm.
Yam khoom siv rau cov khoom coated: tensile zog ≥180 MPa, elongation >1.5%.
Plain foil vs carbon-coated ntawv ci
Qhov no yog qhov kev txiav txim siab tseem ceeb tshaj plaws hauv phau ntawv qhia no, yog li ntawd nws yog tsim nyog los ua leej.
Qhov teeb meem carbon txheej daws
Thaum cathode slurry yog coated ncaj qha mus rau liab qab aluminium ntawv ci, peb yam ua haujlwm tawm tsam koj:
- Tiv tauj tiv thaiv. Cov khoom siv kov cov hlau tsuas yog ntawm cov ntsiab lus tsis sib xws. Interfacial tiv thaiv yog siab, uas ua rau tus nqi muaj peev xwm thiab ua kom muaj cua sov ohmic.
- Kua nplaum. Slurry adhesion rau cov hlau du tsis muaj zog dua li ntxhib, high-surface-cheeb tsam carbon txheej. Tsis zoo adhesion txhais tau hais tias delamination thaum lub sij hawm calendaring thiab cycling.
- Corrosion. Aluminium nto tuaj yeem corrode nyob rau hauv kev sib cuag nrog electrolyte ntev cycling, tshwj xeeb tshaj yog nyob rau siab dua voltages thiab nrog tej yam chemistry.
Qhov txheej txheem carbon ua li cas
Ib sub-micron conductive carbon txheej - feem ntau carbon dub, graphite, graphene los yog sib tov, siv nrog ib tug binder - ua raws li ib tug functional choj ntawm hlau thiab active khoom:
- Ua kom muaj kev sib cuag zoo, lowering interfacial contact resistance
- Improves electrode adhesion, reducing delamination
- Protects the aluminum from oxidation and electrolyte corrosion
- Improves rate capability and cycle stability
- Improves electrolyte wettability during filling
It is a small addition in mass terms and a large one in performance terms.
Carbon coated specifications
| Parameter | Typical requirement |
| Base foil alloy | 1050, 1060, 1100, 1235 |
| Base foil thickness | 12- 20 m os (9–30 μm available) |
| Coating sides | Single side or double side |
| Carbon layer thickness | ≥1 μm per side (0.5–2 μm range, customisable) |
| Deg tsis kam | ≤5 mΩ (production material commonly measures 1–2 mΩ) |
| Nto wetting nro | ≥30 dyne for bare foil; ≥40–50 dyne for carbon-coated |
| Coating adhesion | No delamination after 3M tape pull |
| Solvent resistance | >200 cotton-swab cycles without exposing the foil |
| Electrolyte immersion | No delamination after 24 h |
| Edge margin (tsis sib haum) | Feem ntau 15 Ã 1 mm |
| Areal density (16 μm, coated) | ~42 g/m² |
| Drying compatibility | Vacuum drying up to 150 °C |
Single side or double side? Match it to your electrode coating configuration. Double-side carbon coating gives lower interfacial resistance and better high-rate performance, and is standard for power cells and pouch cells. Single side is often sufficient and cheaper for energy cells or where only one face receives active material.
Coating width is matched to your die — common widths include 170 mm, 230 mm, 260 mm and 280 mm, with an uncoated edge margin for welding the tab.
Nto zoo: where most problems actually start
Surface condition has a direct effect on slurry coating. Kev kis kab mob, excess rolling oil, khawb, nyob, edge cracks or uneven roughness all translate into coating defects and rejected electrode.
Requirements to specify:
- Clean surface with controlled residual rolling oil — this is critical. Residual oil reduces slurry wettability and causes coating defects
- No visible corrosion, oxidation staining, black lines or foreign inclusions
- No folds, khawb hnyav heev, ntug yoj, telescoping or loose winding
- Controlled roughness matched to your coating process
- Stable flatness to support uniform coating and drying
- Slit edges with limited burr and no continuous edge cracking
If you are introducing a new electrode formulation, run trial coils before mass production. Coating behaviour depends on the interaction between your active material, binder, kuab tshuaj, coating weight and calendaring conditions — the foil is one variable in that system, and the only way to know is to test it.
Kev tshuaj xyuas thiab kev tswj kom zoo
Reputable mills inspect throughout production rather than sampling only at the end. Typical inspection items:
| Yam | Lub hom phiaj |
| Tshuaj Muaj Tshuaj | Confirms alloy compliance |
| Kev ntsuas thickness | Verifies gauge accuracy and uniformity |
| Width measurement | Confirms slit tolerance |
| Tensile strength and elongation | Verifies temper and mechanical stability |
| Surface inspection | Khawb, stains, oil marks, suav nrog |
| Kev tshuaj xyuas Pinhole | Suitability for thin-gauge use |
| Ntug zoo | Lub cev tuag, tawg, trimming defects |
| Coil shape | Telescoping, loose winding, edge alignment |
Ask for certificates of analysis, coil labels, packing lists and inspection records as contract deliverables. Gauge uniformity across the coil width and length is what reduces your coating weight variation and electrode rejection rate — this is the parameter worth arguing about.
Packaging and storage
Battery foil is sensitive to moisture, hmoov av, mechanical damage and surface contamination.
- Coils should be packed with protective wrapping, moisture-resistant material, edge protection, and export-grade wooden pallets or cases
- Store in a huv, qhuav warehouse, away from corrosive chemicals, condensation and direct floor contact
- Keep sealed until use — surface oxidation and moisture adsorption degrade coating performance
- Respect first-in, first-out rotation
RFQ checklist
A request that says “roj teeb ntawv ci 13 μm” will not get you a useful quote. Include:
- Base alloy — np. 1235
- Thickness thiab kam rau ua — np. 13 μm, ± 5%
- Temper and mechanical requirements — np. H18, tensile 120–170 MPa
- Plain or carbon coated — and if coated: single or double side
- Carbon layer thickness — np. 1 μm per side
- Width and edge margin — np. 230 mm coated width, 15 mm margin each side
- Target surface resistance — np. ≤2 mΩ
- Surface cleanliness requirement — residual oil limit, if you have one
- Coil ID / OD and length
- Monthly volume and delivery schedule
- Documents required — COA, MSDS, REACH/RoHS, material test certificate
Cov lus nug uas nquag nug
What is the difference between battery foil and ordinary aluminum foil? Battery foil is a high-purity 1xxx alloy with far tighter controls on gauge uniformity, kev huv ntawm qhov chaw, residual rolling oil and pinholes. Ordinary packaging foil is not produced to those tolerances and will cause coating defects.
Why is carbon coating used on cathode foil? It lowers interfacial contact resistance between the aluminum substrate and the cathode active material, improves adhesion, protects against corrosion, and improves rate capability and cycle life.
Should I choose single-side or double-side carbon coating? Double side for power cells, pouch cells and high-rate applications where lowest interfacial resistance matters. Single side is often sufficient for energy cells and costs less. Match it to your electrode coating configuration.
How thin can battery aluminum foil go? 12 μm is in volume use for high-energy cells; 10 μm and below exists but supply is limited. Going thinner requires both a capable mill and a well-tuned coating line — otherwise scrap increases faster than energy density improves.
Can sodium-ion batteries use aluminum foil for both electrodes? Yog lawm. Sodium does not alloy with aluminum the way lithium does, so both current collectors can be aluminum foil. This is part of sodium-ion’s cost advantage and is contributing to demand growth.
What is the typical lead time and MOQ? Both depend on gauge, coating configuration and volume. Coated and slit foil requires additional processing steps beyond plain foil. State your volume and schedule in the RFQ for an accurate figure.
How should I store carbon coated foil? Muab kaw, qhuav, huv, below roughly 40 °C, off the floor, away from condensation and corrosive chemicals, used first-in-first-out.
Discuss your specification
Send us your base alloy, ntsuas, temper and coating configuration — or tell us your cell chemistry, energy density target and coating line parameters, and we will recommend a starting specification and arrange trial coils for evaluation.
Roj teeb Qib thiab Carbon Coated Aluminium Ntawv Nyiaj: Kev Qhia Txog Kev Qhia
Roj teeb txhuas ntawv ci yog lub cathode tam sim no collector nyob rau hauv lub lithium-ion cell - cov hlau substrate uas cov cathode active khoom yog coated rau., thiab qhov ntawd nqa tam sim no tawm ntawm electrode. Nws tsis muaj lub luag haujlwm electrochemical. Nws tsis khaws lub zog. Thiab precisely vim nws yog “inert”, nws yog ib qho yooj yim rau under-specify.
Qhov ntawd yog ib qho yuam kev. Cov ntawv sau tam sim no cuam tshuam rau kev cuam tshuam ntawm lub ntsej muag, txheej adhesion, tus nqi muaj peev xwm, lub neej voj voog, thiab tus nqi seem ntawm cov txheej txheej uas yuav khiav ntawm kaum ntawm meters ib feeb. Tau txais nws yuam kev yog kim nyob rau hauv ib txoj kev uas yog ib qho nyuaj rau taug qab mus rau cov ntawv ci.
Phau ntawv qhia no suav nrog kev xaiv alloy, ntsuas, npau taws sai, rooj plaub rau carbon txheej, thiab cov parameter tsim nyog muab tso rau hauv ib qho kev qhia tshwj xeeb.
Vim li cas txhuas rau cathode thiab tooj liab rau anode
Ib qho pib pib muaj txiaj ntsig, vim nws piav txog feem ntau ntawm cov qauv tsim logic:
| Cathode tam sim no collector | Anode tam sim no collector | |
| Khoom siv | Aluminium ntawv nyiaj | tooj liab ntawv ci |
| Ua li cas | Aluminium ua kom ruaj khov, passivating oxide txheej ntawm cathode muaj peev xwm, thiab yog lub teeb thiab pheej yig | Tooj liab yog ruaj khov ntawm qis (anode) muaj peev xwm tab sis yuav alloy nrog lithium |
| Qhov ntom | 2.7 g/cm³ | 8.96 g/cm³ |
Aluminium yog siv rau ntawm cathode vim tooj liab yuav oxidise ntawm cathode voltages, thiab aluminium vim tooj liab yuav txwv tsis pub hnyav. Yog tias koj tab tom nrhiav rau sodium-ion cell, nco ntsoov tias ob leeg electrodes tuaj yeem siv aluminium ntawv ci - sodium tsis alloy nrog aluminium lithium ua. Qhov no yog ib qho laj thawj vim li cas sodium-ion yog qhov txaus nyiam ntawm tus nqi, thiab nws yog qhov loj hlob ntawm cov roj teeb ntawv thov.
Base alloy xaiv
Cov ntawv ci roj teeb siv 1xxx series - kev lag luam ntshiab txhuas - vim tias kev coj ua thiab purity teeb meem ntau dua li lub zog.
| Alloy | Hom kev siv | Sau ntawv |
| 1235 | Feem ntau cov roj teeb foil alloy | ≥99.35% Al. Zoo sib npaug ntawm conductivity thiab nqi |
| 1060 | Siv dav, me ntsis siab dua purity | ≥99.60% Al |
| 1070 | Kev xav tau purity siab dua | ≥99.70% Al |
| 1050 | Siv nyob rau hauv ib co roj teeb thiab hluav taws xob ntawv ci | ≥99.50% Al |
| 1100 | Xaiv qhov twg yuav tsum muaj zog dua me ntsis | Muaj me Cu |
Ntsuas purity ntawm cov khoom siv feem ntau ua haujlwm siab tshaj qhov tshwj xeeb yam tsawg kawg nkaus - ≥99.0% specification feem ntau ntsuas ≥99.5% hauv kev xyaum.
Tswv yim tswv yim: tsis txhob tshaj qhia purity tshwj tsis yog tias koj cov electrode chemistry xav tau nws. Txhua kauj ruam purity raug nqi nyiaj, thiab 1235 ua haujlwm feem ntau ntawm kev lag luam cathode formulations.
Ntsuas: txoj kev, thiab lub siab mus thinner
Thinner foil txhais tau tias tsis tshua muaj zog hauv lub cell, uas txhais tau hais tias muaj zog ntau dua. Tag nrho kev lag luam raug thawb.
| Thickness | Txoj hauj lwm |
| 20 μm | Cov qauv qub, tseem siv qhov chaw tuav lub zog tseem ceeb |
| 18 μm | Kev saib xyuas, zoo txheej txheem stability |
| 16 μm | Feem ntau hauv ntim ntau lawm |
| 15 μm | Feem ntau rau siab zog ceev |
| 13 μm | Tam sim no lub ntsiab tseem ceeb rau cov hlwb muaj zog |
| 12 μm | Cov hlwb muaj zog heev, xav tau txheej txheem tswj |
| 10 μm thiab hauv qab no | Frontier, khoom siv tsawg |
Rau cov hlwb muaj zog-ntaus, 12- 15 m os yog qhov kev xaiv ib txwm muaj. Rau cov ntawv thov uas txheej txheej ruaj khov thiab tuav lub zog muaj teeb meem ntau dua li ob peb feem pua ntawm lub zog ceev, 18- 20 m os muab cov txheej txheem zoo dua thiab qis dua.
Kev sib pauv yog tiag tiag: raws li ntawv ci tau thinner nws wrinkles thiab stretches yooj yim dua ntawm kev kub ceev, tawg yooj yim dua ntawm khoov, thiab xav kom nruj dua ntsuas ntsuas los ntawm lub zeb. Yog tias koj cov kab txheej txheej tsis zoo-tuned, poob los ntawm 16 m ua to 13 μm tuaj yeem raug nqi koj ntau dua hauv cov khoom seem ntau dua li nws tau txais lub zog ceev.
Temper thiab mechanical zog
Roj teeb foil yuav tsum sib npaug ob hom tsis ua haujlwm. Ntws heev thiab nws wrinkles los yog stretches thaum lub sij hawm high-ceev txheej thiab winding. Nyuaj heev thiab nws tawg ntawm khoov thiab nyuaj rau cua.
| Kub | Hom tensile zog | Hom elongation | Hom kev siv |
| O (ib qho tseem ceeb) | 60-100 MPa | 3-15% | Daim ntawv thov xav tau ductility thiab tsim stability |
| H18 (tag nrho nyuaj) | 120-170 MPa | 1-4% | High-strength ntawv ci rau cov txheej txheem tswj kab |
| H19 | 140-190 MPa | 1-3% | Cov kev xav tau nruj dua |
Cov roj teeb feem ntau yog muab rau hauv H18. Qhov tseeb qhov tseem ceeb nyob ntawm alloy, ntsuas, dov txo thiab annealing tej yam kev mob - pom zoo cov cuab yeej cuab tam ntau yam contractually thiab xav kom nws tshaj tawm ntawm daim ntawv pov thawj cov khoom siv rau txhua qhov ntau lawm.
Yam khoom siv rau cov khoom coated: tensile zog ≥180 MPa, elongation >1.5%.
Plain foil vs carbon-coated ntawv ci
Qhov no yog qhov kev txiav txim siab tseem ceeb tshaj plaws hauv phau ntawv qhia no, yog li ntawd nws yog tsim nyog los ua leej.
Qhov teeb meem carbon txheej daws
Thaum cathode slurry yog coated ncaj qha mus rau liab qab aluminium ntawv ci, peb yam ua haujlwm tawm tsam koj:
- Tiv tauj tiv thaiv. Cov khoom siv kov cov hlau tsuas yog ntawm cov ntsiab lus tsis sib xws. Interfacial tiv thaiv yog siab, uas ua rau tus nqi muaj peev xwm thiab ua kom muaj cua sov ohmic.
- Kua nplaum. Slurry adhesion rau cov hlau du tsis muaj zog dua li ntxhib, high-surface-cheeb tsam carbon txheej. Tsis zoo adhesion txhais tau hais tias delamination thaum lub sij hawm calendaring thiab cycling.
- Corrosion. Aluminium nto tuaj yeem corrode nyob rau hauv kev sib cuag nrog electrolyte ntev cycling, tshwj xeeb tshaj yog nyob rau siab dua voltages thiab nrog tej yam chemistry.
Qhov txheej txheem carbon ua li cas
Ib sub-micron conductive carbon txheej - feem ntau carbon dub, graphite, graphene los yog sib tov, siv nrog ib tug binder - ua raws li ib tug functional choj ntawm hlau thiab active khoom:
- Ua kom muaj kev sib cuag zoo, lowering interfacial contact resistance
- Improves electrode adhesion, reducing delamination
- Protects the aluminum from oxidation and electrolyte corrosion
- Improves rate capability and cycle stability
- Improves electrolyte wettability during filling
It is a small addition in mass terms and a large one in performance terms.
Carbon coated specifications
| Parameter | Typical requirement |
| Base foil alloy | 1050, 1060, 1100, 1235 |
| Base foil thickness | 12- 20 m os (9–30 μm available) |
| Coating sides | Single side or double side |
| Carbon layer thickness | ≥1 μm per side (0.5–2 μm range, customisable) |
| Deg tsis kam | ≤5 mΩ (production material commonly measures 1–2 mΩ) |
| Nto wetting nro | ≥30 dyne for bare foil; ≥40–50 dyne for carbon-coated |
| Coating adhesion | No delamination after 3M tape pull |
| Solvent resistance | >200 cotton-swab cycles without exposing the foil |
| Electrolyte immersion | No delamination after 24 h |
| Edge margin (tsis sib haum) | Feem ntau 15 Ã 1 mm |
| Areal density (16 μm, coated) | ~42 g/m² |
| Drying compatibility | Vacuum drying up to 150 °C |
Single side or double side? Match it to your electrode coating configuration. Double-side carbon coating gives lower interfacial resistance and better high-rate performance, and is standard for power cells and pouch cells. Single side is often sufficient and cheaper for energy cells or where only one face receives active material.
Coating width is matched to your die — common widths include 170 mm, 230 mm, 260 mm and 280 mm, with an uncoated edge margin for welding the tab.
Nto zoo: where most problems actually start
Surface condition has a direct effect on slurry coating. Kev kis kab mob, excess rolling oil, khawb, nyob, edge cracks or uneven roughness all translate into coating defects and rejected electrode.
Requirements to specify:
- Clean surface with controlled residual rolling oil — this is critical. Residual oil reduces slurry wettability and causes coating defects
- No visible corrosion, oxidation staining, black lines or foreign inclusions
- No folds, khawb hnyav heev, ntug yoj, telescoping or loose winding
- Controlled roughness matched to your coating process
- Stable flatness to support uniform coating and drying
- Slit edges with limited burr and no continuous edge cracking
If you are introducing a new electrode formulation, run trial coils before mass production. Coating behaviour depends on the interaction between your active material, binder, kuab tshuaj, coating weight and calendaring conditions — the foil is one variable in that system, and the only way to know is to test it.
Kev tshuaj xyuas thiab kev tswj kom zoo
Reputable mills inspect throughout production rather than sampling only at the end. Typical inspection items:
| Yam | Lub hom phiaj |
| Tshuaj Muaj Tshuaj | Confirms alloy compliance |
| Kev ntsuas thickness | Verifies gauge accuracy and uniformity |
| Width measurement | Confirms slit tolerance |
| Tensile strength and elongation | Verifies temper and mechanical stability |
| Surface inspection | Khawb, stains, oil marks, suav nrog |
| Kev tshuaj xyuas Pinhole | Suitability for thin-gauge use |
| Ntug zoo | Lub cev tuag, tawg, trimming defects |
| Coil shape | Telescoping, loose winding, edge alignment |
Ask for certificates of analysis, coil labels, packing lists and inspection records as contract deliverables. Gauge uniformity across the coil width and length is what reduces your coating weight variation and electrode rejection rate — this is the parameter worth arguing about.
Packaging and storage
Battery foil is sensitive to moisture, hmoov av, mechanical damage and surface contamination.
- Coils should be packed with protective wrapping, moisture-resistant material, edge protection, and export-grade wooden pallets or cases
- Store in a huv, qhuav warehouse, away from corrosive chemicals, condensation and direct floor contact
- Keep sealed until use — surface oxidation and moisture adsorption degrade coating performance
- Respect first-in, first-out rotation
RFQ checklist
A request that says “roj teeb ntawv ci 13 μm” will not get you a useful quote. Include:
- Base alloy — np. 1235
- Thickness thiab kam rau ua — np. 13 μm, ± 5%
- Temper and mechanical requirements — np. H18, tensile 120–170 MPa
- Plain or carbon coated — and if coated: single or double side
- Carbon layer thickness — np. 1 μm per side
- Width and edge margin — np. 230 mm coated width, 15 mm margin each side
- Target surface resistance — np. ≤2 mΩ
- Surface cleanliness requirement — residual oil limit, if you have one
- Coil ID / OD and length
- Monthly volume and delivery schedule
- Documents required — COA, MSDS, REACH/RoHS, material test certificate
Cov lus nug uas nquag nug
What is the difference between battery foil and ordinary aluminum foil? Battery foil is a high-purity 1xxx alloy with far tighter controls on gauge uniformity, kev huv ntawm qhov chaw, residual rolling oil and pinholes. Ordinary packaging foil is not produced to those tolerances and will cause coating defects.
Why is carbon coating used on cathode foil? It lowers interfacial contact resistance between the aluminum substrate and the cathode active material, improves adhesion, protects against corrosion, and improves rate capability and cycle life.
Should I choose single-side or double-side carbon coating? Double side for power cells, pouch cells and high-rate applications where lowest interfacial resistance matters. Single side is often sufficient for energy cells and costs less. Match it to your electrode coating configuration.
How thin can battery aluminum foil go? 12 μm is in volume use for high-energy cells; 10 μm and below exists but supply is limited. Going thinner requires both a capable mill and a well-tuned coating line — otherwise scrap increases faster than energy density improves.
Can sodium-ion batteries use aluminum foil for both electrodes? Yog lawm. Sodium does not alloy with aluminum the way lithium does, so both current collectors can be aluminum foil. This is part of sodium-ion’s cost advantage and is contributing to demand growth.
What is the typical lead time and MOQ? Both depend on gauge, coating configuration and volume. Coated and slit foil requires additional processing steps beyond plain foil. State your volume and schedule in the RFQ for an accurate figure.
How should I store carbon coated foil? Muab kaw, qhuav, huv, below roughly 40 °C, off the floor, away from condensation and corrosive chemicals, used first-in-first-out.
Discuss your specification
Send us your base alloy, ntsuas, temper and coating configuration — or tell us your cell chemistry, energy density target and coating line parameters, and we will recommend a starting specification and arrange trial coils for evaluation.