Affiliation:
1. College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University Wuhan 430072 P. R. China
2. College of Chemistry and Molecular Engineering Zhengzhou University Zhengzhou 450001 P. R. China
3. State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources College of Chemistry Xinjiang University Urumqi Xinjiang 830017 P. R. China
Abstract
AbstractLow‐temperature performance of lithium‐ion batteries (LIBs) has always posed a significant challenge, limiting their wide application in cold environments. In this work, the high‐performance LIBs working under ultralow‐temperature conditions, which is achieved by employing the weak‐solvation and low‐viscosity isobutyronitrile as a cosolvent to tame the affinity between solvents and lithium ions, is reported. The as‐prepared electrolytes exhibit a sufficiently high conductivity (1.152 mS cm−1) at −70 °C. The electrolytes enable LiCoO2 cathode and graphite anode to achieve high Coulombic efficiency of >99.9% during long‐term cycling at room temperature, and to respectively achieve 75.8% and 100.0% of their room‐temperature capacities at −40 °C. Even the LiCoO2//graphite pouch cells can retain 68.7% of the room‐temperature capacity when discharged at −70 °C, and present stable cycling performance at −40 and 60 °C. This work provides a solution for the development of advanced electrolytes to enable LIBs working at wide‐temperatures range.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
25 articles.
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