Improving Room-Temperature Li-Metal Battery Performance by In Situ Creation of Fast Li+ Transport Pathways in a Polymer-Ceramic Electrolyte |
| |
Authors: | Jing Yu Guodong Zhou Yueqing Li Yuhao Wang Dengjie Chen Francesco Ciucci |
| |
Affiliation: | 1. Department of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225 China
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, 000000 China;2. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong, 000000 China;3. College of Chemistry and Materials Science, Jinan University, Guangzhou, 510632 China |
| |
Abstract: | Composite polymer-ceramic electrolytes have shown considerable potential for high-energy-density Li-metal batteries as they combine the benefits of both polymers and ceramics. However, low ionic conductivity and poor contact with electrodes limit their practical usage. In this study, a highly conductive and stable composite electrolyte with a high ceramic loading is developed for high-energy-density Li-metal batteries. The electrolyte, produced through in situ polymerization and composed of a polymer called poly-1,3-dioxolane in a poly(vinylidene fluoride)/ceramic matrix, exhibits excellent room-temperature ionic conductivity of 1.2 mS cm?1 and high stability with Li metal over 1500 h. When tested in a Li|electrolyte|LiFePO4 battery, the electrolyte delivers excellent cycling performance and rate capability at room temperature, with a discharge capacity of 137 mAh g?1 over 500 cycles at 1 C. Furthermore, the electrolyte not only exhibits a high Li+ transference number of 0.76 but also significantly lowers contact resistance (from 157.8 to 2.1 Ω) relative to electrodes. When used in a battery with a high-voltage LiNi0.8Mn0.1Co0.1O2 cathode, a discharge capacity of 140 mAh g?1 is achieved. These results show the potential of composite polymer-ceramic electrolytes in room-temperature solid-state Li-metal batteries and provide a strategy for designing highly conductive polymer-in-ceramic electrolytes with electrode-compatible interfaces. |
| |
Keywords: | in situ formations Li-metal batteries low interfacial resistivities polymer-in-ceramic solid-state batteries |
|
|