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 1350 mAh/g composite active-material capacity, 11 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 | 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 | 1350 mAh/g, based on active material mass |
| Coating Loading | 11 mg/cm2 |
| 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 |
| Compaction Density | 1.0 g/cm3 |
| Coating Area | 140 mm × 80 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 1350 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 11 mg/cm2 coating loading and 90.30% active material in the dry electrode coating.
11 mg/cm2 × 90.30% × 1350 mAh/g ÷ 1000 ≈ 13.4 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 requires dry handling and inert atmosphere storage to prevent moisture-induced degradation. Mechanical damage such as bending, scratching, or contamination of the coated surface must be avoided to maintain electrode integrity.
- Moisture Sensitivity: Moisture exposure on the coated electrode surface must be minimized by using a dry handling environment and inert atmosphere storage.
- Mechanical Integrity: The coated surface must not be touched, bent, scratched, or contaminated during punching, transfer, and stacking.
- Electrolyte Compatibility: Electrolyte systems and formation procedures must be optimized for silicon-containing anodes to achieve reliable SEI formation and first-cycle efficiency.
- Irreversible Capacity Loss: Silicon-related irreversible capacity loss must be considered in pre-lithiation strategies and full-cell N/P ratio design.
- Areal Capacity Calculation: Active material mass for coin-cell testing is calculated from coating loading, active material ratio, and punched electrode area.
Follow these steps to properly handle the electrode sheet, minimize moisture exposure, and calculate active material mass for coin-cell testing. This ensures reliable electrochemical data and prevents mechanical damage.
Required Equipment:
- Prepare Dry Environment
Prepare a dry handling environment such as a glovebox or dry room with inert atmosphere to minimize moisture exposure. - Transfer Sheet to Dry Environment
Open the package and transfer the electrode sheet to the dry environment immediately to prevent moisture adsorption. - Punch Electrode Discs
Punch electrode discs using a clean punch, ensuring the coated surface is not touched or contaminated during the process. - Calculate Active Material Mass
Calculate the active material mass for each disc using the coating loading, active material ratio, and punched disc area.
How does the 1350 mAh/g composite specific capacity relate to the actual silicon capacity in this Si-C/graphite anode?
The 1350 mAh/g value is the composite active-material capacity of the Si-C/graphite blend, not the capacity of pure Si-C (1600 mAh/g) or graphite (~345 mAh/g). It is used for electrode loading and areal-capacity calculations: at 11 mg/cm² coating loading and 90.30% active material ratio, the theoretical areal capacity is approximately 13.4 mAh/cm². Measured capacity depends on factors such as electrolyte, voltage window, and silicon-related irreversible capacity loss.
What are the implications of using a carbon-coated copper current collector for silicon-containing composite anodes?
The double-sided carbon-coated copper current collector (1 µm carbon / 6 µm copper / 1 µm carbon) improves interfacial contact between the anode coating and the collector. This is especially relevant for silicon-containing composite anodes, where interface stability and electrode integrity can influence early-cycle data. The carbon coating helps mitigate delamination and contact resistance compared to bare copper foil.
What storage and handling conditions are required to maintain electrode integrity before cell assembly?
Sheets must be handled in a dry environment to reduce moisture exposure on the coated surface. Opened packs should be stored in a dry environment or inert atmosphere before use. Avoid touching, bending, scratching, or contaminating the coated surface during punching, transfer, and stacking to preserve electrode quality.
This double-sided Si-C/graphite composite anode sheet with 1350 mAh/g composite capacity and 11 mg/cm² loading on a carbon-coated copper foil is designed for high-capacity anode evaluation, electrolyte screening, and full-cell balancing, but requires careful dry handling and accounts for silicon-related irreversible capacity loss.
Positive
- High composite specific capacity: The 1350 mAh/g composite active-material capacity supports high-energy-density anode studies, enabling evaluation beyond standard graphite electrodes.
- Carbon-coated copper current collector: The double-side carbon-coated copper foil (1 µm carbon / 6 µm Cu / 1 µm carbon) improves interfacial contact and electrode integrity, which is particularly relevant for silicon-containing anodes and early-cycle data reliability.
Trade-offs
- Dry handling and inert storage required: The electrode must be handled in a dry environment and stored in an inert atmosphere to minimize moisture exposure before use, adding operational constraints for lab deployment.
- Measured capacity depends on multiple variables: Actual capacity is influenced by electrolyte system, formation protocol, voltage window, and silicon-related irreversible capacity loss, requiring careful experimental control for reproducible results.
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).
