公开(公告)号：US09142864B2

公开(公告)日：2015-09-22

申请号：US13296753

申请日：2011-11-15

申请人： Gregory Alan Roberts ,  Rainer J Fasching ,  Constantin I Stefan

发明人： Gregory Alan Roberts ,  Rainer J Fasching ,  Constantin I Stefan

IPC分类号： H01M4/36 ,  H01M4/38 ,  H01M10/0569 ,  B82Y30/00 ,  H01M4/04 ,  H01M4/134 ,  H01M4/48 ,  H01M10/052 ,  H01M10/0568

CPC分类号： H01M10/0569 ,  B82Y30/00 ,  H01M4/0428 ,  H01M4/134 ,  H01M4/366 ,  H01M4/386 ,  H01M4/483 ,  H01M4/75 ,  H01M10/052 ,  H01M10/0525 ,  H01M10/0568 ,  H01M2300/0034 ,  H01M2300/0037 ,  Y02E60/122

摘要： Provided are novel electrolytes for use in rechargeable lithium ion cells containing high capacity active materials, such as silicon, germanium, tin, and/or aluminum. These novel electrolytes include one or more pyrocarbonates and, in certain embodiments, one or more fluorinated carbonates. For example, dimethyl pyrocarbonate (DMPC) may be combine with mono-fluoroethylene carbonate (FEC). Alternatively, DMPC or other pyrocarbonates may be used without any fluorinated carbonates. A weight ratio of pyrocarbonates may be between about 0% and 50%, for example, about 10%. Pyrocarbonates may be combined with other solvents, such as ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and/or ethyl-methyl carbonate (EMC). Alternatively, pyrocarbonates may be used without such solvents. Experimental results conducted using electrochemical cells with silicon based electrodes demonstrated substantial improvements in cycle life when pyrocarbonate containing electrolytes were used in comparison with pyrocarbonate free electrolytes.

摘要翻译： 提供了用于可再充电锂离子电池的新型电解质，其包含高容量活性材料，例如硅，锗，锡和/或铝。 这些新型电解质包括一种或多种热解碳酸盐，并且在某些实施方案中包括一种或多种氟化碳酸盐。 例如，焦碳酸二甲酯（DMPC）可以与单氟代碳酸亚乙酯（FEC）组合。 或者，可以使用DMPC或其它焦碳酸酯而没有任何氟化碳酸酯。 焦碳酸酯的重量比可以在约0％至50％之间，例如约10％。 焦碳酸酯可以与其它溶剂如碳酸亚乙酯（EC），碳酸亚丙酯（PC），碳酸二甲酯（DMC），碳酸二乙酯（DEC）和/或碳酸甲乙酯（EMC）等组合。 或者，可以使用焦碳酸酯而不使用这些溶剂。 使用具有硅基电极的电化学电池进行的实验结果表明，当使用含焦碳酸盐的电解质与无焦碳酸盐电解质相比时，循环寿命显着改善。