In‐Built Quasi‐Solid‐State Poly‐Ether Electrolytes Enabling Stable Cycling of High‐Voltage and Wide‐Temperature Li Metal Batteries. (26th June 2021)

• Record Type: Journal Article
• Authors: Chen, Yong; Huo, Feng; Chen, Shimou; Cai, Weibin; Zhang, Suojiang
• Is Part Of: Advanced functional materials. Volume 31:Number 36(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-06-26
• Subjects: high‐voltage -- in‐build poly‐ether electrolytes -- solid‐state metal batteries -- wide‐temperature -- long cycling; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202102347
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Developing solid‐state electrolytes with good compatibility for high‐voltage cathodes and reliable operation of batteries over a wide‐temperature‐range are two bottleneck requirements for practical applications of solid‐state metal batteries (SSMBs). Here, an in situ quasi solid‐state poly‐ether electrolyte (SPEE) with a nano‐hierarchical design is reported. A solid‐eutectic electrolyte is employed on the cathode surface to achieve highly‐stable performance in thermodynamic and electrochemical aspects. This performance is mainly due to an improved compatibility in the electrode/electrolyte interface by nano‐hierarchical SPEE and a reinforced interface stability, resulting in superb‐cyclic stability in Li|| Li symmetric batteries (> 4000 h at 1 mA cm −2 /1 mAh cm −2 ; > 2000 h at 1 mA cm −2 /4 mAh cm −2 ), which are the same for Na, K, and Zn batteries. The SPEE enables outstanding cycle‐stability for wide‐temperature operation (15–100 ° C) and 4 V‐above batteries (Li|| LiCoO2 and Li|| LiNi0.8 Co0.1 Mn0.1 O2 ). The work paves the way for development of practical SSMBs that meet the demands for wide‐temperature applicability, high‐energy density, long lifespan, and mass production. Abstract : An in situ quasi solid‐state polyether electrolyte (SPEE) with a nano‐hierarchical design is reported. A solid‐eutectic electrolyte is employed on the cathode surface to achieve highly‐stable performance in thermodynamic and electrochemical aspects. This performance is mainly due to an improved compatibility in the electrode/electrolyte interface by nano‐hierarchical SPEE and a reinforced interface stability, resulting in superb‐cyclic stability in Li||Li symmetric batteries.