石墨负极界面SEI膜与锂离子电池热失控

张佳怡, 翁素婷, 王兆翔, 王雪锋

Solid electrolyte interphase （SEI） on graphite anode correlated with thermal runaway of lithium-ion batteries

Jiayi ZHANG, Suting WENG, Zhaoxiang WANG, Xuefeng WANG

图7 (a) 在不含添加剂或含质量分数2% VC/乙交酯(GL00)/GL01添加剂的1 mol/L LiPF6 EC/EMC (体积比1∶2) 电解液中循环1周后的石墨负极DSC曲线[61]；(b) 在1.8 mol/L LiFSI DOL电解液中形成的SEI膜的高分辨cryo-TEM图像，插图显示了相应的快速傅里叶变换(FFT)图；(c) 为 (b) 高分辨cryo-TEM图像的相应示意图；(d) 含两种电解液的LiFePO4||石墨软包电池的长循环性能，插图显示了软包电池的照片[66]；(e) Li+ 在SEI膜中的扩散活化能[67]

Fig. 7 (a) DSC curves of the fully de-lithiated graphite anodes collected from the cells cycled in 1 mol/L LiPF6 EC/EMC (volume ratio 1∶2) electrolytes with/without mass fraction 2% VC/glycolide (GL00)/GL01 additives[61]; (b) High-resolution cryo-TEM image of the SEI formed in 1.8 mol/L LiFSI DOL electrolyte, and the inset shows the corresponding FFT pattern; (c) Corresponding schematic of the high-resolution cryo-TEM image; (d) Long cycling performance of LiFePO4||graphite pouch cells with two electrolytes, and the inset shows a photograph of the pouch cell[66]; (e) Diffusion activation energy of Li+ in SEI[67]