Boosting the Energy Density of Li||CFx Primary Batteries Using a 1,3-Dimethyl-2-imidazolidinone-Based Electrolyte

• DOI: 10.1021/acsami.1c19016
• Publication Date: 2021-11-24T12:09:46Z
• Authors: Ang Fu; Yukang Xiao; Junhua Jian; Lin Huang; Chao Tang; Xunxin Chen; Yue Zou; Jiuzhou Wang; Yong Yang; Jianming Zheng
• Keywords: Dimethoxyethane; Energy density

Elevating the discharge voltage plateau is regarded as most effective strategy to improve energy density of Li||CFx batteries in consideration finite capacity CFx (x ∼ 1) cathodes. Here, an electrolyte, with LiBF4 1,3-dimethyl-2-imidazolidinone (DMI)/1,2-dimethoxyethane (DME), developed for first time substantially promote without compromising available capacity. DME possesses property low viscosity, while DMI functions increase during owing its moderate nucleophilicity and donor number, which decreases barrier breaking C-F bonds. The optimized electrolyte exhibits a significantly high average 2.69 V at current 10 mA g-1, 11.6% higher than control (2.41 V). In addition, 2099 Wh kg-1 achieved (vs 1905 electrolyte), showing great potential practical applications.