Si-C/Graphite Composite Single-Sided Anode Sheet
This single-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, 4.5 mg/cm2 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 | Single-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 | 4.5 mg/cm2 |
| Coating Side | Single-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 4.5 mg/cm2 coating loading and 90.30% active material in the dry electrode coating.
4.5 mg/cm2 × 90.30% × 1100 mAh/g ÷ 1000 ≈ 4.5 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 must be handled in dry conditions to prevent performance degradation. Silicon-containing anodes are prone to irreversible capacity loss and interface instability, necessitating a controlled environment during storage and processing.
- Moisture Sensitivity: Exposure to ambient moisture can degrade the coated electrode surface and adversely affect early-cycle performance.
- Mechanical Integrity: Avoid touching, bending, scratching, or contaminating the coated surface during punching, transfer, and stacking to prevent electrode damage.
- Atmospheric Control: Store opened sheets in a dry environment or inert atmosphere to minimize moisture uptake before use.
- Electrochemical Failure Modes: Silicon-related irreversible capacity loss and interface stability issues can affect data consistency if handling protocols are not followed.
This procedure ensures proper handling and preparation of the anode sheet for coin-cell assembly. It emphasizes moisture control and mechanical care to maintain electrode integrity.
Required Equipment: Dry handling environment (e.g., glovebox or dry room), Inert atmosphere storage container (optional)
- Prepare Dry Handling Environment
Use a dry handling environment before cell assembly to reduce moisture exposure on the coated electrode surface. - Store Opened Sheets Properly
Store opened sheets in a dry environment or inert atmosphere to reduce moisture exposure before use. - Handle Coated Surface with Care
Avoid touching, bending, scratching, or contaminating the coated surface during punching, transfer, and stacking. - Calculate Active Material Mass
Calculate active material mass from coating loading, active material ratio, and punched electrode area.
What is the theoretical areal capacity of the Atomfair Si-C/graphite composite anode sheet with SKU AF-BM-S-A1100-CS45-5P0, and how should it be interpreted in cell balancing?
The theoretical areal capacity is approximately 4.5 mAh/cm², calculated from a 4.5 mg/cm² coating loading, 90.30% active material ratio, and 1100 mAh/g composite specific capacity. However, measured capacity depends on electrode area, coating uniformity, electrolyte system, formation procedure, voltage window, and silicon-related irreversible capacity loss, so the theoretical value serves as a starting point for N/P balancing and should be validated experimentally.
What current collector design does this single-sided Si-C/graphite anode sheet use, and why is it specifically suited for silicon-containing anodes?
The electrode uses a double-side carbon-coated copper foil with a 1 µm carbon coating on each side of a 6 µm copper foil, with an areal density of 5.4 mg/cm². The carbon coating improves interfacial contact between the anode coating and current collector, which is particularly relevant for silicon-containing composite anodes where interface stability and electrode integrity can influence early-cycle data.
What handling and storage conditions are required for the Atomfair Si-C/graphite composite anode sheet to maintain its performance for research use?
The sheets must be handled in a dry environment before cell assembly to reduce moisture exposure, and opened sheets should 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, active material mass should be determined from coating loading, active material ratio, and punched electrode area.
This single-sided Si-C/graphite composite anode sheet, with a 1100 mAh/g composite active-material capacity and 4.5 mg/cm2 coating loading on a carbon-coated copper current collector, is designed for high-capacity anode evaluation, electrolyte screening, and full-cell matching in lithium-ion battery R&D. The carbon-coated collector improves interfacial contact, but the electrode requires dry handling and exhibits significant first-cycle irreversible capacity loss typical of silicon-containing anodes.
Positive
- Carbon-coated copper current collector: The double-side carbon coating (1 µm each side) on 6 µm copper foil improves interfacial contact between the anode coating and current collector, enhancing interface stability and electrode integrity for silicon-containing composite anodes.
- High composite specific capacity: The 1100 mAh/g composite active-material capacity, derived from a Si-C/graphite blend, enables evaluation of higher-capacity anodes compared to standard graphite electrodes, supporting electrolyte screening and full-cell balancing studies.
Trade-offs
- Moisture sensitivity requires dry handling: The coated electrode surface must be handled in a dry environment or inert atmosphere before cell assembly to reduce moisture exposure, which can affect SEI formation and first-cycle efficiency.
- Significant irreversible capacity loss: Silicon-containing composite anodes exhibit notable first-cycle irreversible capacity loss due to SEI formation and silicon-related volume changes, requiring pre-lithiation or careful N/P balancing for full-cell experiments.
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).
