扩散应力诱导的锂离子电池失效机理研究进展

王亚楠,李华,王正坤,厉青峰,练晨,何鑫

Progress on Failure Mechanism of Lithium Ion Battery Caused by Diffusion Induced Stress

WANG Yanan,LI Hua,WANG Zhengkun,LI Qingfeng,LIAN Chen,HE Xin

表2 与扩散应力有关的电池单体的失效现象及机理

Table 2 Failure phenomenon of cell and their corresponding mechanism

Failure phenomenon Corresponding mechanism Ref. Capacity decay/lifetime reduction Side reaction of active particles and electrolyte results in regeneration of SEI film [99] Excessive stress causes fracture of electrode [100] Uneven distribution of pressure inside cell brings about lithium precipitation on electrode [100, 103] Deformation of jelly roll leads to delamination between active layer and current collector [101] Impedance rise Porosity decreasing and tortuosity increasing of positive and negative electrodes and separator [94-95] Deformation of jelly roll leads to delamination between active layer and current collector [101]