广东工业大学学报 ›› 2023, Vol. 40 ›› Issue (03): 74-82.doi: 10.12052/gdutxb.220190
王雅婷1, 李健辉2, 叶海平2, 刘军1, 施志聪1
Wang Ya-ting1, Li Jian-hui2, Ye Hai-ping2, Liu Jun1, Shi Zhi-cong1
摘要: 1,2,3-三(2-氰氧基)丙烷(1,2,3-Tris(2-cyanoethoxy) propane,TPPN)作为一种新的电解液添加剂,可应用于4.55 V高电压钴酸锂(LiCoO2) /石墨软包电池。通过对比不含和含有TPPN添加剂的锂电池的循环性能,发现加入质量分数为2%的TPPN能大幅提高电池性能。3.00~4.55 V下以1C/1C倍率充放电,含有2%TPPN的电池在25℃下循环900周容量保持率为86.4%,而未添加TPPN的样品仅为8.7%。从理论计算和线性扫描数据可知,TPPN较电解液溶剂优先分解。从LiCoO2表面上X射线光电子能谱的N 1s谱可知,TPPN在钴酸锂表面形成界面膜。从阻抗数据可知,该界面膜具有低阻抗和高稳定性质。从理论计算、LiCoO2表面上扫描、透射电镜、X射线衍射谱和石墨表面上X射线光电子能谱的Co 2p谱可知,该界面膜能有效抑制电解液分解和钴离子的溶出,确认了界面膜的高稳定性质。
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