Carbon Coated Silicon Anode Material Silicon Carbon Composite Powder for Lithium Ion Batteries

Product Overview

This high-performance carbon-coated silicon composite powder is engineered specifically to overcome the physical and electrochemical limitations of conventional graphite anodes in next-generation lithium-ion battery architectures. By embedding finely dispersed nanoscale silicon domains within an engineered conductive carbonaceous framework and sealing the architecture with a uniform carbon outer shell, this material delivers dramatically enhanced specific capacity while maintaining structural stability throughout repeated lithiation and delithiation cycles.

Designed for rigorous electrochemical research, battery prototyping, and commercial cell manufacturing, the composite powder accommodates the high-energy demands of electric vehicles, portable electronics, and grid-scale energy storage systems. Its tailored surface chemistry and controlled particle size distribution ensure seamless integration into existing aqueous and solvent-based electrode slurry formulations without requiring disruptive changes to standard cell manufacturing lines.

Manufactured under stringent process quality controls, this active anode material provides reliable batch-to-batch consistency, high initial Coulombic efficiency, and optimized tap density. The engineered outer carbon coating mitigates continuous solid electrolyte interphase (SEI) degradation, lowers electrical volume resistance, and suppresses mechanical pulverization, ensuring consistent and reproducible electrochemical performance in demanding testing and operational environments.

Key Features

• Engineered Core-Shell Architecture: Features a robust, uniform carbon surface coating encapsulating active silicon particles, which minimizes direct electrolyte exposure, lowers volume resistivity from ~1,500 Ω·cm down to approximately 100 mΩ·cm, and significantly stabilizes SEI formation.
• High Specific Discharge Capacity: Delivers reversible specific capacities ranging from ≥400 mAh/g to ≥500 mAh/g, offering a substantial energy density uplift compared to conventional synthetic or natural graphite anodes (372 mAh/g theoretical limit).
• High Initial Coulombic Efficiency (ICE): Optimized surface chemistry and controlled defect density yield an initial Coulombic efficiency between 87.0% and 91.0%, reducing irreversible initial lithium trapping and preserving precious active lithium inventory in full-cell configurations.
• Controlled Particle Size Distribution: Precision classification maintains tightly controlled D10, D50, and D90 metrics across all grades, preventing agglomeration, ensuring uniform current distribution across the coated foil, and promoting smooth slurry rheology.
• Optimized Specific Surface Area (BET): Retains a low specific surface area of less than 2.0 m²/g across all standard grades, suppressing excessive electrolyte consumption, side reactions, and gas generation during formation and long-term cycling.
• Mechanical Volume Strain Buffering: The internal disordered carbon matrix functions as a resilient mechanical cushion that absorbs the severe volumetric expansion of silicon during lithiation, preventing particle cracking, contact loss, and rapid capacity fade.
• High Compaction and Tap Density: Demonstrates tap densities up to 0.95 g/cm³ and compressed pellet densities exceeding 1.20 g/cm³, facilitating high volumetric energy density in calendered electrode sheets when processed on precision rolling presses.
• Ready Slurry Compatibility: Disperses uniformly with standard water-soluble binders (such as SBR/CMC and PAA) and conductive carbon additives, allowing immediate drop-in evaluation in standard slot-die, doctor-blade, or roll-to-roll laboratory coating workflows.

Applications

Technical Specifications

Analytical & Morphological Characteristics

• Conductive Carbonaceous Coating: Surface hard carbon encapsulation creates an interconnected conductive network across each particle, reducing contact resistance between active silicon domains and current collector foils.
• Controlled Microstructure: Synthesized through precision milling, pyrolytic carbon deposition, and advanced thermal classification, eliminating agglomerates and minimizing fine particulate dust.
• Electrochemical Handling: Exhibits suppressed surface polarization and moderated lithium-silicon phase transformation, preventing hyper-lithiated alloy surface saturation and fostering uniform bulk lithiation.
• Binder Compatibility: Highly receptive to cross-linkable binders such as polyacrylic acid (PAA), sodium carboxymethyl cellulose (CMC), and styrene-butadiene rubber (SBR), ensuring robust mechanical adhesion to copper foil during high-rate cycling.

Recommended Laboratory Handling & Electrode Fabrication

To achieve optimal electrochemical performance, this anode powder should be handled under controlled ambient conditions (relative humidity < 2% or within an argon-filled glove box whenever possible). For slurry preparation, high-shear planetary mixing is recommended to uniformly disperse the composite powder alongside conductive additives (e.g., carbon nanotubes, super P) and aqueous binder systems. Following doctor-blade or slot-die coating onto battery-grade copper foil, precision roll pressing (calendering) at controlled temperatures is critical to achieve the target electrode density of 1.20 to 1.50 g/cm³ without inducing internal silicon particle fracture.

Why Choose This Product

• Superior Electrochemical Reversibility: Engineered with a high initial Coulombic efficiency up to 91% and ultra-low BET surface area (< 2.0 m²/g), minimizing irreversible capacity losses and early electrolyte exhaustion.
• Advanced Volume Strain Management: The dual-phase carbon-silicon architecture accommodates cyclic mechanical expansion and contraction, preventing structural pulverization, active material delamination, and rapid cell degradation.
• Precision Batch Manufacturing: Tight tolerances across particle size distributions (D10, D50, D90) and tap density guarantee consistent slurry viscosity, uniform film deposition, and reproducible laboratory and pilot-scale test results.
• Turnkey Integration with Laboratory Workflow: Fully compatible with standard mixing, precision coating, and heated roll pressing equipment, enabling researchers and engineers to accelerate cell development timelines without retooling.

Contact our technical sales team today to request a quotation, discuss custom packaging options, or consult with our materials specialists regarding your specific battery chemistry requirements.

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