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论文类型：期刊论文

发表时间：2018-08-27

发表刊物：ADVANCED ENERGY MATERIALS

收录刊物：SCIE

卷号：8

期号：24

ISSN号：1614-6832

关键字：2D materials; Li metal anodes; solid polymer electrolytes; thermal stability; vermiculite sheets

摘要：Solid state electrolytes are the key components for high energy density lithium ion batteries and especially for lithium metal batteries where lithium dendrite growth is an inevitable obstacle in liquid electrolytes. Solid polymer electrolytes based on a complex of polymers and lithium salts are intrinsically advantageous over inorganic electrolytes in terms of processability and film-forming properties. But other properties such as ionic conductivity, thermal stability, mechanical modulus, and electrochemical stability need to be improved. Herein, for the first time, 2D additives using few-layer vermiculite clay sheets as an example to comprehensively upgrade poly(ethylene oxide)-based solid polymer electrolyte are introduced. With clay sheet additives, the polymer electrolyte exhibits improved thermal stability, mechanical modulus, ionic conductivity, and electrochemical stability along with reduced flammability and interface resistance. The composite polymer electrolyte can suppress the formation and growth of lithium dendrites in lithium metal batteries. It is anticipated that the clay sheets upgraded solid polymer electrolyte can be integrated to construct high performance solid state lithium ion and lithium metal batteries with higher energy and safety.