A Shuttle-Free Solid-State Cu-Li Battery Based on a Sandwich-Structured Electrolyte

作者：Wang, Huimin; Wang, Changhong; Zheng, Matthew; Liang, Jianneng; Yang, Ming; Feng, Xingyu; Ren, Xiangzhong; Yu, Denis Y. W.; Li, Yongliang^*; Sun, Xueliang^*

来源：Angewandte Chemie - International Edition, 2023, 62(3).

DOI：10.1002/anie.202214117

• Cu-Li Batteries
• Deep Eutectic Solvent
• Metal Cathodes
• Sandwich Electrolyte
• Solid-State Batteries

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 Li1.4Al0.4Ti1.6(PO4)(3) interlayer is used to block Cu-ion crossover. Because of the high ionic conductivity (0.55 mS cm(-1) at 25 degrees 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 kg(Cu)(-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.

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