期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 25, 页码 14344-14351出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta03059k
关键词
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资金
- Key-Area Research and Development Program of Guangdong Province [2020B090919001]
- National Natural Science Foundation of China [U2001220]
- Guangdong Basic Research Foundation [2019A1515110446]
- Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center [XMHT20200203006]
- Shenzhen Technical Plan Project [JCYJ20180508152210821, JCYJ20170817161221958, JCYJ20180508152135822]
- Shenzhen Graphene Manufacturing Innovation Center [201901161513]
A thin and high-strength composite polymer electrolyte (CPE) was developed in this study through constructing efficient interfacial ion-transport channels using trace electrolyte vapor. The CPE showed improved performance and stability in solid-state lithium metal batteries, achieving a specific capacity of 141.1 mA h g(-1) with a capacity retention rate of 85.6% after 360 cycles at 25 degrees C.
Solid polymer electrolytes for solid-state lithium metal batteries face the challenges of low ionic conductivity, poor mechanical properties, and large thickness. Herein, a thin and high-strength composite polymer electrolyte (CPE) is developed via infusing a polyethylene oxide (PEO)/(CF3SO2)(2)NLi (LiTFSI) electrolyte into a polyacrylonitrile (PAN) network, where highly efficient and uniform interfacial ion-transport channels are constructed through micro-wetting using trace electrolyte vapor. The trace electrolyte vapor creates fast-ion-transport channels at both the external CPE/electrode interface and the internal PAN/PEO interface in the CPE, and its LiPO2F2 product is favorable for the cycling stability. The rigid PAN network can not only enhance the mechanical strength and promote Li-ion conductivity, but it also strongly adsorbs Li-salt anions and improves the lithium-ion transference number (0.49) of the CPE, inducing the uniform stripping and deposition of Li metal and suppressing Li dendrite growth. The LiFePO4 (LFP)/CPE/Li solid-state battery achieves a specific capacity of 141.1 mA h g(-1) with a capacity retention rate of 85.6% and Coulombic efficiency of 100.0% after 360 cycles at 25 degrees C. This work provides a facile strategy for constructing thin and high strength CPEs with high performance at room temperature.
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