固态聚合物锂电池失效机制及其表征技术

Solid state polymer lithium battery with the advantages of high energy density and high safety is promising to overcome the range anxiety and security issue of electric vehicles. However, there are several failure behaviors in solid state polymer lithium battery, such as capacity fading, overcharge, gas, internal short-circuit, and calendar failure. And the in-depth study and understanding on the failure mechanisms are limited by the suitable characterization techniques due to the low resistance to irradiation of polymer electrolyte and the difficulty to expose perfect electrode/electrolyte interface. So, developing suitable characterization techniques for solid state polymer lithium batteries is significant to better understand the failure mechanisms and help researchers find feasible solutions to overcome battery failure. In this review, the development of failure mechanisms and characterization techniques for solid state polymer lithium batteries are summarized from the aspects of lithium dendrite growth, cathode structure evolution and mechanical failure, interface microstructure evolution and interface reaction, as well as structure evolution of polymer electrolyte. Finally, new research strategies and methods of the failure mechanisms for solid state polymer lithium batteries are proposed.