Si-C/Graphite Composite Double-Sided Anode Sheet
This double-sided Si/C silicon-carbon graphite anode sheet is designed for lithium-ion battery R&D using a 1100 mAh/g composite active-material capacity, 9.0 mg/cm2 total, 4.5 mg/cm2 per side coating loading, and a carbon-coated copper current collector. It is intended for high-capacity anode evaluation, electrolyte screening, and early-stage full-cell matching.
For upstream powder selection, see Atomfair lithium-ion anode materials. For projects requiring a different Si-C/graphite blend, loading, coating side, current collector, or roll/sheet format, review Atomfair Custom Battery Electrode Coating Service.
| Product Specification | Value / Description |
|---|---|
| Product Type | Double-sided Si-C/graphite composite anode electrode sheet for lithium-ion battery research |
| Active Material System | Si-C / graphite composite active material |
| Composite Specific Capacity | 1100 mAh/g, based on active material mass |
| Coating Loading | 9.0 mg/cm2 total, 4.5 mg/cm2 per side |
| Coating Side | Double-sided |
| Active Material Ratio | 90.30% of dry electrode coating formulation |
| Current Collector | Double-side carbon-coated copper foil |
| Current Collector Structure | 1 µm carbon coating / 6 µm copper foil / 1 µm carbon coating |
| Current Collector Areal Density | 5.4 mg/cm2 |
| Coating Area | 90 mm × 140 mm |
| Coating Process | Wet process |
| Pack Size | 5 sheets per pack |
Material Architecture and Capacity Basis
This electrode uses a Si-C/graphite composite design. Pure Si-C is rated at 1600 mAh/g, while graphite is approximately 345 mAh/g.
The listed 1100 mAh/g value is the composite active-material capacity used for electrode loading and areal-capacity calculation; it is not the capacity of pure Si-C.
Electrode Loading and Areal Capacity
Areal capacity is often more useful than gravimetric capacity alone because it connects active-material capacity to cell balancing. This product uses 9.0 mg/cm2 total, 4.5 mg/cm2 per side coating loading and 90.30% active material in the dry electrode coating.
9.0 mg/cm2 total, 4.5 mg/cm2 per side × 90.30% × 1100 mAh/g ÷ 1000 ≈ 8.9 mAh/cm2
Measured capacity depends on punched electrode area, coating uniformity, drying protocol, electrolyte system, formation procedure, pressure, voltage window, and silicon-related irreversible capacity loss.
Current Collector Design
The electrode is coated on a double-side carbon-coated copper foil current collector. The collector structure is 1 µm carbon coating / 6 µm copper foil / 1 µm carbon coating, with a current collector areal density of 5.4 mg/cm2.
Compared with bare copper foil, carbon-coated copper foil can improve interfacial contact between the anode coating and current collector. This is especially relevant for silicon-containing composite anodes, where interface stability and electrode integrity can influence early-cycle data.
| Research Use Case | What This Product Helps Evaluate |
|---|---|
| High-capacity anode evaluation | Studies of Si-C/graphite composite anodes with higher capacity than standard graphite electrodes. |
| Electrolyte and additive screening | Comparison of electrolyte systems under silicon-containing anode conditions, including SEI formation behavior and first-cycle efficiency sensitivity. |
| Pre-lithiation research | Evaluation of lithium-loss compensation strategies for high-capacity anodes with significant initial irreversible capacity. |
| Full-cell matching | Early-stage N/P balancing and cathode loading matching for lithium-ion full-cell experiments. |
Handling, Storage and Pre-Use Treatment
- Use a dry handling environment before cell assembly to reduce moisture exposure on the coated electrode surface.
- Store opened sheets in a dry environment or inert atmosphere to reduce moisture exposure before use.
- Avoid touching, bending, scratching, or contaminating the coated surface during punching, transfer, and stacking.
- For coin-cell testing, determine active material mass from coating loading, active material ratio, and punched electrode area.
| Research Need | Related Atomfair Category | Best For |
|---|---|---|
| Start from active material selection | Lithium-Ion Anode Materials | Selecting Si-C/graphite powders before coated-electrode testing. |
| Compare ready-to-use anode sheets | Lithium-Ion Anode Electrode Sheets | Comparing graphite, Si/C, wet-process, dry-process, single-sided, and double-sided sheets. |
| Match a cathode for full-cell work | Lithium-Ion Cathode Electrode Sheets | Lithium-ion full-cell balancing and N/P ratio design. |
| Build a pouch-cell research platform | Lithium-Ion Dry Pouch Cells | Electrolyte filling, formation studies, and early full-cell evaluation. |
| Change the electrode specification | Custom Battery Electrode Coating Service | Custom loading, coating area, collector, formulation, and roll or sheet format. |
| Plan the wider battery R&D workflow | Battery Research Materials, Cells & Diagnostics Guide | Connecting materials, electrode sheets, cells, testing, and diagnostics. |
This electrode sheet is moisture-sensitive and requires dry handling and storage to prevent degradation. The silicon-carbon composite anode exhibits significant irreversible capacity loss during initial cycling, requiring careful cell balancing and pre-lithiation compensation.
- Moisture Sensitivity: Exposure to ambient moisture can degrade the electrode coating, necessitating dry handling and inert atmosphere storage.
- Mechanical Integrity: Avoid touching, bending, scratching, or contaminating the coated surface to maintain electrode integrity and prevent local delamination or short circuits.
- Capacity Calculation: Active material mass for coin-cell testing must be determined from coating loading, active material ratio, and punched electrode area to ensure accurate areal capacity.
- Interface Stability: The carbon-coated copper current collector improves interfacial contact but does not eliminate silicon-related irreversible capacity loss, which affects early-cycle data.
- Electrolyte Compatibility: Electrolyte and additive screening should account for SEI formation behavior and first-cycle efficiency sensitivity under silicon-containing anode conditions.
How is the theoretical areal capacity of 8.9 mAh/cm² derived for the AF-BM-S-A1100-CD45-5P0 Si-C/graphite anode sheet?
The theoretical areal capacity is calculated using the total coating loading of 9.0 mg/cm², active material ratio of 90.30%, and composite active-material capacity of 1100 mAh/g. The calculation is 9.0 mg/cm² × 90.30% × 1100 mAh/g ÷ 1000 ≈ 8.9 mAh/cm². This value is based on the active material mass in the dry electrode coating and does not account for irreversible capacity losses or testing conditions.
Why is a carbon-coated copper current collector used for this Si-C/graphite composite anode?
The electrode uses a double-side carbon-coated copper foil current collector with a structure of 1 µm carbon / 6 µm copper / 1 µm carbon. Carbon-coated copper foil improves interfacial contact between the anode coating and current collector compared to bare copper foil, which is especially relevant for silicon-containing composite anodes where interface stability and electrode integrity can influence early-cycle data.
What handling and storage precautions are required for the AF-BM-S-A1100-CD45-5P0 anode sheet to maintain electrode integrity?
The electrode should be handled in a dry environment before cell assembly to reduce moisture exposure. Opened sheets must be stored in a dry environment or inert atmosphere. Avoid touching, bending, scratching, or contaminating the coated surface during punching, transfer, and stacking. For coin-cell testing, determine active material mass from coating loading, active material ratio, and punched electrode area.
This double-sided Si-C/graphite composite anode sheet, with a 1100 mAh/g active-material capacity and 9.0 mg/cm² total loading on carbon-coated copper foil, is designed for high-capacity anode evaluation, electrolyte screening, and full-cell balancing. Its performance is sensitive to dry handling, inert storage, and the significant irreversible capacity inherent to silicon-containing anodes, requiring careful pre-lithiation or compensation strategies.
Positive
- High composite specific capacity: Rated at 1100 mAh/g, this Si-C/graphite composite provides over three times the capacity of standard graphite anodes (~345 mAh/g), enabling evaluation of high-capacity anode materials in lithium-ion cells.
- Carbon-coated copper current collector: The double-side carbon coating (1 µm carbon / 6 µm Cu / 1 µm carbon) improves interfacial contact between the anode coating and current collector, which is critical for maintaining electrode integrity and early-cycle data quality in silicon-containing composite anodes.
Trade-offs
- Moisture-sensitive handling required: The coated electrode surface must be handled in a dry environment or inert atmosphere to prevent moisture exposure before cell assembly. The surface cannot be touched, bent, scratched, or contaminated during punching and transfer, requiring careful lab protocols.
- Significant irreversible capacity loss: Silicon-containing anodes exhibit substantial initial irreversible capacity, necessitating pre-lithiation or lithium-compensation strategies. Measured capacity depends on multiple variables including electrolyte formulation, formation procedure, voltage window, and cell pressure, adding complexity to data interpretation.
Every advanced material, component, equipment, and instrument in our catalog is backed by rigorous testing. We maintain strict internal quality management frameworks and align with CE conformity metrics to deliver transparent, reproducible performance data via our public open-science repository.
To request raw batch performance data, submit formal vendor registration paperwork, or execute a fast-turnaround R&D manufacturing loop, contact us at inquiry@atomfair.com.
Item is dispatched under the Atomfair Shipping & Delivery Framework (Free worldwide shipping on orders over $59 USD excl. heavy equipment). Return is governed by the Atomfair Return & Refund Policy (7-day technical return window).
