添加剂LiBOB在LiCoO2体系中的性能研究

采用恒流充放电法研究了LiBOB对LiCoO2作正极体系高温循环性能的影响。使用DSC法分析了LiBOB对负极SEI膜热稳定性的影响。初步探讨了LiBOB对PC基电解质与MAG相容性的影响机理。交流阻抗法测试结果表明,LiBOB的添加使MAG电极表面形成一层稳定的固体电解液相界面膜(SEI),抑制了PC共嵌,并使循环性能得到改善。DSC结果分析表明,LiBOB使负极SEI膜的热稳定性得到了改善。

Study on the property of LiBOB as additive in LiCoO2 system

Galavanostatic charge and discharge was used to study the influence of LiBOB on the high temperature performance in the system of LiCoO2 as cathode.DSC was used to study the effect of LiBOB on the thermal stability of SEI in anode.The influence of LiBOB on compatibility of PC based electrolyte solution with MAG anode was studied.The electrochemical impedance spectroscopy（EIS） results showed that adding LiBOB could form stable SEI on the surface of MAG and suppress the co-intercalation of PC in graphite,which could greatly improve the cyclic performance.And the DSC results showed that LiBOB could greatly improve the thermal stability of SEI in the anode.