锂离子电池微米硅负极材料研究进展

Research overview of micron silicon anode materials for lithium-ion batteries

高性能负极材料的发展是锂离子电池新材料领域的一大主题。相比于商业化的石墨负极,硅具有储锂容量高的天然优势,无疑是下一代高容量负极材料的发展方向。纳米硅负极材料虽然具备很高的理论比容量,但低的振实密度和面积载量严重削弱了体积比容量和质量比容量。因此,设计高振实密度微米硅基负极可以赋予更好的综合性能。本文首先阐明了微米硅应用存在的问题,然后综述了微米硅结构设计、碳复合和黏结剂设计等改性方法,为微米硅的研究提供了借鉴。

The development of high-performance anode materials is a long running theme in the field of advanced materials used for lithium-ion batteries,Compared with commercial graphite anode,silicon is undoubtedly the development direction of the next generation of high-capacity anode materials with the natural advantage of high lithium storage capacity,Although nano-sized silicon has high theoretical specific capacity,low-tap-density and area-load seriously weaken the specific volume capacity and mass capacity,Therefore,designing micron silicon with high tap-density can reveal better comprehensive performance,In this overview,the problems existing in the application of micron silicon are first explained,and then the modification methods of micron silicon structure design,carbon composite and binder design are reviewed,which provides reference for the research of micron silicon.