Co-solvents with High Coulombic Efficiency in Propylene Carbonate Based Electrolytes
    5.
    发明申请
    Co-solvents with High Coulombic Efficiency in Propylene Carbonate Based Electrolytes 有权
    在丙烯碳酸酯基电解质中具有高库仑效率的共溶剂

    公开(公告)号:US20150099191A1

    公开(公告)日:2015-04-09

    申请号:US14506158

    申请日:2014-10-03

    摘要: A homologous series of cyclic carbonate or propylene carbonate (PC) analogue solvents with increasing length of linear alkyl substitutes were synthesized and used as co-solvents with PC for graphite based lithium ion half cells. A graphite anode reaches a capacity around 310 mAh/g in PC and its analogue co-solvents with 99.95% Coulombic efficiency. Cyclic carbonate co-solvents with longer alkyl chains are able to prevent exfoliation of graphite when used as co-solvents with PC. The cyclic carbonate co-solvents of PC compete for solvation of Li ion with PC solvent, delaying PC co-intercalation. Reduction products of PC on graphite surfaces via single-electron path form a stable Solid Electrolyte Interphase (SEI), which allows the reversible cycling of graphite.

    摘要翻译: 合成了直链烷基取代基长度长的环状碳酸酯或碳酸亚丙酯(PC)类似物溶剂的同系物系,并与PC作为石墨基锂离子半电池的辅助溶剂。 在PC及其模拟助溶剂中,石墨阳极达到310 mAh / g的容量,具有99.95%的库仑效率。 与较长的烷基链的环状碳酸酯共溶剂在与PC共溶剂时能够防止石墨脱落。 PC的环状碳酸酯共溶剂与PC溶剂竞争Li离子溶剂化,延缓PC共嵌入。 通过单电子路径在石墨表面上的PC的还原产物形成稳定的固体电解质相(SEI),其允许石墨的可逆循环。