期刊
ACS OMEGA
卷 6, 期 43, 页码 29060-29070出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.1c04275
关键词
-
资金
- National Science Foundation (NSF) [DMR 1464111]
- Linda and Bipin Doshi Endowment at the Missouri University of Science and Technology
A solid polymer electrolyte (MWCNT-SPE) with high thermal stability was obtained in this study and used in solid-state lithium batteries. These batteries exhibited excellent electrochemical properties at high temperatures, demonstrating a wide range of operations suitable for extreme demands.
Rechargeable lithium-ion batteries (LIBs) have a wide range of applications but face challenges in harsh working or operating environments at high temperatures. In this work, a solid polymer electrolyte with MWCNT-COOH as an additive (MWCNT-SPE) was obtained. MWCNT-SPE has a high thermal stability and can be used in high-temperature operating environments. Solid-state lithium batteries based on MWCNT-SPE and LiFePO4 were assembled. The resulting lithium batteries exhibited excellent electrochemical properties at 70 and 120 degrees C, demonstrating a wide range of operations suitable for solid-state batteries with extreme demands. The symmetrical Li/MWCNT-SPE/Li cell operated for 1800 h with low polarization voltage and no short circuit, and the LiFePO4/MWCNT-SPE/Li cell delivered superior cycling performance under both 0.2 and 0.5 C-rates, indicating that the interface compatibility between the lithium metal and MWCNT-SPE membrane was good and could effectively suppress the formation of lithium dendrites. The superior performance of the resulting MWCNT-SPE was due to the weak interaction between PEO, PVDF-HFP, and MWCNT-COOH, which reduced the tendency of PEO's crystallinity and thereby significantly increased the Li+ migration ability and improved the cycling life of the batteries.
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