Zhou Junhua, Zhang Chi, Wang Huimin, Guo Yanpeng, Xie Chuan, Luo Yufeng, Wang Chao, Wen Shujing, Cai Jiehua, Yu Wancheng, Chen Fan, Zhang Yufei, Huang Qiyao, Zheng Zijian
School of Fashion and Textiles, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China.
Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China.
Adv Sci (Weinh). 2024 Nov;11(44):e2410129. doi: 10.1002/advs.202410129. Epub 2024 Oct 1.
High-voltage Li metal battery (HV-LMB) is one of the most promising energy storage technologies to achieve ultrahigh energy density. Nevertheless, electrolytes reported to date are difficult to simultaneously stabilize the Li metal anode and high-voltage cathode, especially without the assistance of expensive and corrosive high-concentration Li salts. Herein, a dual-interphase-stabilizing (DIS) and safe electrolyte that bypasses the high-concentration Li salt is reported. The electrolyte consists of high-flash-point sulfolane as solvent, molecular-orbital-engineered additives that enable stable B-F rich cathodic interphase, and unique C-F rich organic anodic interphase. The stable cycling of both Li metal anode and 4.75 V-LiCoO cathode in the DIS electrolyte (> 500 cycles) is demonstrated. HV-LMB pouch cells of a high energy density (435 Wh kg) can sustainably operate for more than 100 cycles. Moreover, the low cost and high thermal stability of the DIS electrolyte offer superior cost-effectiveness and safety for large-scale applications of HV-LMBs in the future.
高压锂金属电池（HV-LMB）是实现超高能量密度最具前景的储能技术之一。然而，迄今为止报道的电解质难以同时稳定锂金属负极和高压正极，尤其是在没有昂贵且腐蚀性强的高浓度锂盐辅助的情况下。在此，报道了一种绕过高浓度锂盐的双相间稳定（DIS）且安全的电解质。该电解质由高闪点环丁砜作为溶剂、能形成稳定的富含B-F阴极界面的分子轨道工程添加剂以及独特的富含C-F的有机阳极界面组成。展示了在DIS电解质中锂金属负极和4.75 V-LiCoO正极的稳定循环（>500次循环）。高能量密度（435 Wh/kg）的HV-LMB软包电池可持续运行超过100次循环。此外，DIS电解质的低成本和高热稳定性为未来HV-LMB的大规模应用提供了卓越的性价比和安全性。
