Wang Shuqi, Zhao Xia, Li Jingyuan, Wang Fei, Liu Quanbing, Zhang Chengzhi
Ji Hua Laboratory, Foshan, Guangdong, 528000, China.
Department of Chemistry, College of Sciences, Northeastern University, Shenyang, Liaoning 110819, China.
Nanoscale. 2025 Sep 18;17(36):20998-21008. doi: 10.1039/d5nr01633a.
Silicon-based materials are known as promising anodes for new-generation lithium-ion batteries due to their high theoretical capacity and various properties, but the huge volume expansion of silicon-based electrodes greatly limits their development. Herein, this study designs an integrated co-carbonized layer (CCL) silicon-based anode with nano hollow carbon sphere (HCS) buffer materials (HCSs/Si/G-CCL) to regulate the volume expansion of electrodes and effectively increase the content of active materials. As a result, the HCSs/Si/G-CCL electrode with buffer materials offered a good buffer effect, and the electrode expansion degree was only 4.0% after cycling, which was far lower than that of commercial anodes (174.3%), effectively mitigating the severe volume expansion of silicon during lithiation. The HCSs/Si/G-CCL exhibited a reversible capacity of 702 mAh g after 100 cycles at 1.0 A g, with the capacity retained around 75%. The full cell also manifested excellent cycle stability, exhibiting commercial-level areal capacities of 1.9 mAh cm after 100 cycles. This work presents a general electrode design approach that mitigates the volume expansion of silicon-based anodes, enabling their practical large-scale application in lithium-ion batteries.
硅基材料因其高理论容量和多种特性，被认为是新一代锂离子电池有前景的负极材料，但硅基电极巨大的体积膨胀极大地限制了它们的发展。在此，本研究设计了一种带有纳米空心碳球（HCS）缓冲材料的集成共碳化层（CCL）硅基负极（HCSs/Si/G-CCL），以调节电极的体积膨胀并有效增加活性材料的含量。结果，带有缓冲材料的HCSs/Si/G-CCL电极表现出良好的缓冲效果，循环后电极膨胀率仅为4.0%，远低于商业负极（174.3%），有效减轻了硅在锂化过程中的严重体积膨胀。HCSs/Si/G-CCL在1.0 A g下循环100次后，可逆容量为702 mAh g，容量保持在75%左右。全电池也表现出优异的循环稳定性，在100次循环后表现出1.9 mAh cm的商业级面积容量。这项工作提出了一种通用的电极设计方法，可减轻硅基负极的体积膨胀，使其能够在锂离子电池中实际大规模应用。
