锂离子电池硅基负极粘结剂研究进展

Advances of Binder for Silicone-based Anode in Lithium Ion Batteries

由于硅在地壳中含量丰富且具有较高的理论比容量,成为近年来新一代高能量密度锂离子电池负极材料的研究热点。然而,硅在循环过程中会产生巨大的体积变化,会导致电极粉化脱落,容量快速衰减,限制了硅在锂离子电池中良好性能的发挥。虽然改性的硅基材料可以有效地缓解体积变化所产生的机械应变,但硅固有的体积变化效应是始终存在的,一种合适的粘结剂对于保持电极结构的完整性起到至关重要的作用。本文主要综述了近年来硅基负极粘结剂的研究进展,总结了合成类聚合物粘结剂、生物质聚合物粘结剂和导电聚合物粘结剂在硅基负极中的应用和性能特点,为今后在粘结剂的选择和设计上提供了重要的研究思路。

Silicon is expected to replace graphite materials become the new generation anode materials of lithium ion batteries(LIBs)due to abundant resources and high theoretical specific capacity.However,Siliconsuffers fromsevere volume change during thecycle process,resulting in pulverization and breakage of electrode and rapid capacity loss,limiting the development of the satisfactory performance in LIBs.Although modified silicon-based materials canmitigate effectively the mechanical strain resulting from volume change,but the intrinsic volume change effect of silicon always exists,an appropriate binder plays a critical role to maintain the integrity of electrode structure.This article reviewed the research progress of silicon-based anode binderin recent years,summarized the application and performance characteristics of the synthetic polymer binder,biomass polymer binder and conductive polymer binder in silicon-based anode.It provides an important research approach forthe choice and design of the binder in future.