Affiliation:
1. School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South University Changsha Hunan 410083 China
2. State Key Laboratory of Powder Metallurgy Central South University Changsha Hunan 410083 China
Abstract
AbstractLow safety, unstable interfaces, and high reactivity of liquid electrolytes greatly hinder the development of lithium metal batteries (LMBs). Quasi‐solid‐state electrolytes (QGPEs) with superior mechanical properties and high compatibility can meet the demands of LMBs. Herein, a biodegradable polyacrylonitrile/polylactic acid‐block‐ethylene glycol polymer (PALE) as membrane skeleton for GPEs is designed and systematically investigated by regulating the length and structure of the cross‐linked chain. Benefiting from the enriched affinitive sites of polar functional groups (CO, COC, CN, and OH) in highly cross‐linked polymer structure, the designed PALE membrane skeleton exhibits flame‐retardant property and ultrahigh liquid electrolyte uptake property, and the derived quasi‐solid‐state PALE GPEs deliver enhanced stretchability and a higher electrochemical stable window of 5.11 V. Besides, the PALE GPEs effectively protect cathodes from corrosion while allowing uniform and fast transfer of Li+ ions. Therefore, the Li||Li symmetrical battery and LFP or NCM811||Li full‐cell using PALE GPEs exhibit excellent cycling stability coupled with compact and flat inorganic/organic interface layers. And the excellent cycling stability of pouch cells under harsh operating conditions indicates the application possibilities of PALE GPEs in flexible devices with high‐energy‐density.
Funder
National Natural Science Foundation of China
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
12 articles.
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