锂离子电池硅负极表面改性的研究进展

Research progress on surface modification of Si anodes for Lithium-ion battery

摘要:

硅由于具有高的理论比容量、低的脱嵌锂电位、储量丰富等优势已成为当前高能量密度锂离子电池重要开发的高性能负极材料，但硅负极较大的体膨胀效应和较低的电导率等问题限制硅负极在商业中进一步的应用。针对硅负极材料发展所面临的问题，本文着重从硅的表面改性包括表面包覆、表面功能化、人造固相电解质膜等技术展开综述，分析了这些改性策略及电化学性能改进机理，并对硅表面改性技术进一步发展做了简单展望，旨在开发出高能量密度动力锂电池用关键硅负极材料。

Abstract:

Silicon has become an important anode material to improve energy density for lithium-ion batteries due to its higher theoretical specific capacity, low intercalation potential and abundance on earth. However, large volume expansion effect and low electrical conductivity of silicon material impede its further industrial application. In view of these problems facing the development of silicon anodes, this paper focuses on the review of Si surface modification, including surface coating, functionalization, and artificial solid electrolyte interface. These surface modification strategies and their improvement mechanism of electrochemical properties are analyzed, and the further development of silicon surface modification technology is briefly prospected in order to develop the key silicon anode materials for high energy density power lithium-ion batteries.