全固态锂离子电池用PEO基聚合物电解质的研究进展

Research Progress in PEO Based Polymer Electrolytes of All Solid State Lithium Ion Battery

锂离子电池作为重要的能量储存元件在消费类电子产品、电动汽车和可再生能源存储等领域具有广泛的应用。传统液态电解质锂离子电池受到能量密度低、安全性差等诸多缺陷的限制,采用固态电解质替代液态电解质制备新型固态锂离子电池目前备受关注。PEO基固态聚合物电解质由于其设计简单、易于制造、使用安全等优点已被认为是替代传统液体电解质的首选。介绍了当前PEO基聚合物电解质的主要研究种类、特点和性能;阐述了锂离子在PEO基聚合物电解质中的导电机制;分析了与PEO络合的锂盐种类对聚合物电解质的电导率的影响规律;在此基础上提出了几种改善PEO基聚合物电解质性能的措施和方法。

As an important component of energy storage,lithium-ion battery has been widely used in consumer electronics products,electric vehicles and renewable energy storage.Because the traditional lithium-ion battery which used liquid electrolyte has limitations on energy density and security,using solid state electrolyte instead of liquid electrolyte to develop novel all solid state lithium-ion battery is becoming more and more attractive.PEO-based solid polymer electrolyte has been considered as a preferred alternative to the conventional liquid electrolyte because of its advantages in terms of simplicity of design,easy production and operational safety.The current research about major types,characteristics and performances of PEO-based polymer electrolytes are presented.The conduction mechanism of lithium ion in PEO-based polymer electrolytes is described,and the effects of the kinds of lithium salts having the complexation with PEO on the conductivity of resultant polymer electrolytes are analysed.Based on these,several measures and methods for improving performance of PEO-based polymer electrolytes are proposed.