Fan Rong, Liu Chen, He Kangqiang, Ho-Sum Cheng Samson, Chen Dazhu, Liao Chengzhu, Li Robert K Y, Tang Jiaoning, Lu Zhouguang
Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering , Shenzhen University , Shenzhen 518060 , PR China.
Department of Materials Science and Engineering , City University of Hong Kong , Kowloon , Hong Kong , PR China.
ACS Appl Mater Interfaces. 2020 Feb 12;12(6):7222-7231. doi: 10.1021/acsami.9b20104. Epub 2020 Feb 3.
All-solid-state lithium metal batteries are highly attractive because of their high energy density and inherent safety. However, it is still a great challenge to design the solid electrolytes with high ionic conductivity at room temperature and good electrode/electrolyte interfacial compatibility simultaneously in a facile and scalable way. In this work, for the first time, the combination of salt affluent Poly(ethylene oxide) with LiLaZrTaO nanofibers was designed and intensively evaluated. The synergistic effect of each component in the electrolyte enhances the ionic conductivity to 2.13 × 10 S cm at 25 °C and exhibits a high transference number of 0.57. The composite electrolyte possesses superior interfacial stability against Li metal for over 680 h in Li symmetric cells even at a relatively high current density of 2 mA cm. The all-solid-state batteries employing the solid electrolytes exhibit excellent cycling stability at room temperature and superior safety performance. This work proposes a brand-new strategy to design and fabricate solid electrolytes in a versatile way for room-temperature all-solid-state batteries.
全固态锂金属电池因其高能量密度和固有安全性而极具吸引力。然而，以简便且可扩展的方式同时设计出在室温下具有高离子电导率和良好电极/电解质界面兼容性的固体电解质，仍然是一项巨大的挑战。在这项工作中，首次设计并深入评估了富盐聚环氧乙烷与LiLaZrTaO纳米纤维的组合。电解质中各组分的协同效应将离子电导率在25℃时提高到2.13×10 S cm ，并表现出0.57的高迁移数。即使在2 mA cm 的相对高电流密度下，复合电解质在锂对称电池中对锂金属也具有超过680小时的优异界面稳定性。采用该固体电解质的全固态电池在室温下表现出优异的循环稳定性和卓越的安全性能。这项工作提出了一种全新的策略，以通用的方式设计和制造用于室温全固态电池的固体电解质。
