锂离子电池负极中一步球磨硅碳材料的应用

One-step ball-milled silicon/carbon composite as anode in lithium-ion batteries

近年来,硅基类材料的高理论比容量使其在能源存储尤其锂离子电池电极材料的应用受到了广泛的关注。通过简单的高能球磨法制备了硅碳(Si/C)复合材料,同时对比了采用不同硅碳比例进行球磨后的复合材料的形貌及性能情况。球磨Si/C复合材料在作为锂离子电池负极时展现了较好的电化学性能,与碳的复合有效抑制了合金硅材料在充放电过程中由于体积膨胀导致的容量快速衰减,同时,碳硅的混合比例对其电化学性能也起到了较大的影响。通过简单一步球磨方法和调控硅碳比例制备高循环稳定性和高容量的改进方式为硅基类材料在锂离子电池中的实际应用拓展了更大的空间。

In recent years,silicon-based materials have attracted a lot of research attention due to their high theoretical capacity,especially when applied as the anode materials of lithium ion batteries.In this paper,Si/C composite is prepared using a simple high-energy ball milling method,and the products with different milling time and carbon sources are compared.The Si/C composite material demonstrates excellent electrochemical performance when used as the anode of the lithium ion batteries.Moreover,the carbon in the product can effectively accommodate the volume expansion of the anode during the insertion and desertion of lithium ions.It is believed that the facile ball milling method,which synthesizes the silicon-based materials and which demonstrates good electrochemical performance,is beneficially deployed in the application of lithium ion batteries.