Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 8, Pages 7171-7179Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b19726
Keywords
self-protection; cellulose ester; sol gel transition; electrochemical storage devices
Funding
- National Natural Science Foundation of China [51273145, 51143009]
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A major stumbling block in large-scale adoption of high-energy-density electrochemical devices has been safety issues. Methods to control thermal runaway are limited by providing a one-time thermal protection. Herein, we developed a simple and reversible thermoresponsive electrolyte system that is efficient to shutdown the current flow according to temperature changes. The thermal management is ascribed to the thermally activated sol gel transition of methyl cellulose solution, associated with the concentration of ions that can move between isolated chains freely or be restricted by entangled molecular chains. We studied the effect of cellulose concentration, substituent types, and operating temperature on the electrochemical performance, demonstrating an obvious capacity loss up to 90% approximately of its initial value. Moreover, this is a cost-effective approach that has the potential for use in practical electrochemical storage devices.
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