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Constructing a Stable Lithium Metal-Gel Electrolyte Interface for Quasi-Solid-State Lithium Batteries.

著者 Zuo TT , Shi Y , Wu XW , Wang PF , Wang S , Yin YX , Wang WP , Ma Q , Zeng XX , Ye H , Wen R , Guo YG
ACS Appl Mater Interfaces.2018 Aug 24 ; ():.
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Because of high specific capacity and low redox potential, Li metal has long been considered as one of the most promising anode materials for next-generation rechargeable batteries. However, interfacial problems, including interfacial instability towards liquid electrolytes and poor interfacial contact with solid-state electrolytes, severely plague the practical application of Li metal anodes. Here we report an interfacial regulation strategy that stabilizes the Li metal-gel electrolyte interface through in situ constructing a stable solid electrolyte interphase (SEI) layer. By stabilizing the interface of Li metal anodes, the double polymer network gel electrolyte enables dendrite-free morphology and high plating/stripping efficiency. Furthermore, a direct visualization of smooth deposition and dendrite suppression behaviors at the anode/electrolyte interface is achieved by operando optical microscopy. The systematic analysis of electrochemical tests, scanning electron microscopy and X-ray photoelectron spectroscopy results, further confirms that the formed SEI layer is responsible for homogeneous deposition and stable cycling performance. Benefiting from the interfacial stability between electrodes and electrolytes, the lifespan of Li metal batteries is extended. This proof-of-concept work provides a valuable insight on the critical role of interfacial stability through rationally designing gel electrolyte for high-performance Li metal batteries.
PMID: 30141899 [PubMed - as supplied by publisher]
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