A novel electrolyte additive for improving the interfacial stability of high voltage lithium nickel manganese oxide cathode

作者：Huang, Wenna; Xing, Lidan^*; Zhang, Ruiqin; Wang, Xianshu; Li, Weishan

来源：Journal of Power Sources, 2015, 293: 71-77.

DOI：10.1016/j.jpowsour.2015.05.070

• Lithium nickel manganese oxide cathode
• High voltage lithium ion batteries
• Interfacial stability
• Phenyl trifluoromethyl sulfide
• Electrolyte additive

In this work, we propose a novel electrolyte additive phenyl trifluoromethyl sulfide (PTS) to improve the interfacial stability of high voltage lithium nickel manganese oxide (LiMn1.5Ni0.5O4) cathode/electrolyte. At 1C rate, addition of 0.5% PTS improves the capacity retention of LiMn1.5Ni0.5O4 from 65% to 84% after 450 cycles at room temperature, and from 64% to 95% after 100 cycles at evaluate temperature. Density functional theory calculation and experimental characterization demonstrate that PTS oxidizes preferentially to the carbonate base electrolyte, generating a SEI film, which effectively suppresses the continuous decomposition of carbonate base electrolyte and the structural destruction of LiMn1.5Ni0.5O4.

• 出版日期2015-10-20
• 单位香港城市大学; 华南师范大学