A Shuttle‐Free Solid‐State Cu−Li Battery Based on a Sandwich‐Structured Electrolyte. Issue 3 (8th December 2022)

• Record Type: Journal Article
• Authors: Wang, Huimin; Wang, Changhong; Zheng, Matthew; Liang, Jianneng; Yang, Ming; Feng, Xingyu; Ren, Xiangzhong; Yu, Denis Y. W.; Li, Yongliang; Sun, Xueliang
• Is Part Of: Angewandte Chemie international edition. Volume 62:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-08
• Subjects: Cu−Li Batteries -- Deep Eutectic Solvent -- Metal Cathodes -- Sandwich Electrolyte -- Solid-State Batteries; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202214117
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Cu−Li batteries leveraging the two‐electron redox property of Cu can offer high energy density and low cost. However, Cu−Li batteries are plagued by limited solubility and a shuttle effect of Cu ions in traditional electrolytes, which leads to low energy density and poor cycling stability. In this work, we rationally design a solid‐state sandwich electrolyte for solid‐state Cu−Li batteries, in which a deep‐eutectic‐solvent gel with high Cu‐ion solubility is devised as a Cu‐ion reservoir while a ceramic Li1.4 Al0.4 Ti1.6 (PO4 )3 interlayer is used to block Cu‐ion crossover. Because of the high ionic conductivity (0.55 mS cm −1 at 25 °C), wide electrochemical window (>4.5 V vs. Li + /Li), and high Cu ion solubility of solid‐state sandwich electrolyte, a solid‐state Cu−Li battery demonstrates a high energy density of 1 485 Wh kgCu −1 and long‐term cyclability with 97 % capacity retention over 120 cycles. The present study lays the groundwork for future research into low‐cost solid‐state Cu−Li batteries. Abstract : Low‐cost Cu−Li batteries leveraging Cu cathode dissolution/deposition have been hindered by electrolyte related issues, including Cu crossover, low conductivity, etc. Here the authors design a sandwich solid‐state electrolyte by sandwiching a Li1.4 Al0.4 Ti1.6 (PO4 )3 pellet with two deep‐eutectic‐solvent gels to address these issues. The as‐prepared solid‐state Cu−Li battery exhibits significantly improved cyclability and practical energy density.