一种适配于4.5 V高电压富锂锰基正极材料的新型电极液添加剂的开发  

Development of the Electrolyte Additive Suitable for 4.5 V High Voltage Lithium-rich Manganese-based Cathode Materials

作　　者：杨海东 宋晓艺 Yang Haidong;Song Xiaoyi(Guangzhou Tinci Materials Technology Co.,Ltd.,Guangzhou 510030,China)

机构地区：[1]广州天赐高新材料股份有限公司,广东广州510030

出　　处：《广东化工》2024年第23期10-13,共4页Guangdong Chemical Industry

摘　　要：由于市场对新能源汽车的里程焦虑,高电压富锂锰基正极材料(LLOs)因其高放电比容量(>250 mAh/g),低成本优势,作为最有潜力化解能量密度困扰的新型锂离子电池之一备受市场关注。然而传统锂离子电解液主盐六氟磷酸锂(LiPF6)以及碳酸脂溶剂无法承受LLOs体系较高的工作电压,PF6-阴离子发生有害副反应,且碳酸酯溶剂在LLOs正极表面不断分解沉积,锂离子迁移动力学受限,且较高工作电压下LLOs材料缺陷导致晶格氧的析出,催化电解液分解产生衡量水,致使高水敏感锂盐LiPF6的水解生成HF,攻击正极活性材料,形成过渡金属氟化物(TMFx),形成不具功能性的CEI。同时TMs迁移破坏SEI,严重劣化电池的循环性能以及安全性能。Due to the market's anxiety about the mileage of new energy vehicles,high-voltage lithium-rich manganese-based cathode materials(LLOs)have attracted market attention as one of the new lithium-ion batteries with the greatest potential to resolve the energy density problem due to their high discharge specific capacity(>250 mAh/g)and low-cost advantages.However,the traditional lithium ion electrolyte main salt lithium hexafluorophosphate(LiPF6)and carbonate solvent cannot withstand the higher operating voltage of the LLOs system,PF6-anion harmful side reactions,and carbonate solvent in the anode surface of the LLOs continue to decomposition and deposition of lithium-ion migration kinetics is limited,and the higher operating voltage under the LLOs defects in the material led to the precipitation of lattice oxygen,catalyzed by the decomposition of the electrolyte At the same time,the migration of TMs destroys the SEI,which seriously degrades the cycling performance and safety performance of the battery.

关 键 词：富锂锰基正极 锂离子电池电解液 高电压 正极成膜添加剂 

分 类 号：TQ[化学工程]