CVD Silicon-Carbon Anode

Polarization-Driven Capacity Oscillation

Capacity oscillation of this anode arises from trapped active lithium due to kinetic limitations, with polarization behavior varying across cycling stages and affecting diffusion and SEI stability.

Yang, Fei · Yi, Zonglin · Chen, Jingpeng · Xie, Lijing · Fan, Yafeng · Su, Fangyuan

ACS Applied Materials & Interfaces 2026

Advantages

Quantifies trapped lithium

Uses a CC-CV protocol to quantify trapped active lithium caused by kinetic limitations, which standard constant-current tests cannot separate.

Identifies polarization as key

Multi-scale characterization confirms polarization as the main influencing factor governing abnormal capacity variation, not just structural or interfacial parameters alone.

Stage-specific mechanisms

In the first stage, low trapped lithium impedes diffusion and continuous SEI growth increases polarization; in the second stage, moderate trapped lithium and stable SEI enhance diffusion and reduce polarization.

Applications

• Li-ion Battery Anode：Improve cycling stability and evaluation accuracy of high-capacity anodes
• Electrochemical Energy Storage：Guide failure analysis and design of silicon-carbon anodes in energy storage batteries
• Silicon-Carbon Composite Anode：Reveal capacity oscillation mechanism to optimize fabrication and testing of silicon-carbon anodes
• Battery Testing and Evaluation：Provide a CC-CV protocol to quantify trapped active lithium for battery testing