申请人:The Regents of the University of California
公开号:US20130288126A1
公开(公告)日:2013-10-31
A family of carboxylic acid groups containing fluorene/fluorenon copolymers is disclosed as binders of silicon particles in the fabrication of negative electrodes for use with lithium ion batteries. Triethyleneoxide side chains provide improved adhesion to materials such as, graphite, silicon, silicon alloy, tin, tin alloy. These binders enable the use of silicon as an electrode material as they significantly improve the cycle-ability of silicon by preventing electrode degradation over time. In particular, these polymers, which become conductive on first charge, bind to the silicon particles of the electrode, are flexible so as to better accommodate the expansion and contraction of the electrode during charge/discharge, and being conductive promote the flow battery current.
本发明公开了一种含有芴/芴醌共聚物的羧酸基家族,可用作锂离子电池负极中硅颗粒的粘结剂。三乙二氧基侧链提供了对材料(如石墨、硅、硅合金、锡、锡合金)的改进粘附性能。这些粘结剂使硅作为电极材料得以使用,因为它们显著提高了硅的循环性能,防止电极随时间而降解。特别是这些聚合物在第一次充电时变得导电,与电极的硅颗粒结合,具有良好的柔韧性,以更好地适应充电/放电过程中电极的膨胀和收缩,并且具有导电性,促进电池电流的流动。