电解质
碳酸丙烯酯
电化学
过电位
锂(药物)
碳酸二甲酯
电池(电)
共价键
储能
化学
无机化学
电极
物理化学
有机化学
热力学
催化作用
物理
内分泌学
功率(物理)
医学
作者
Yukang Xiao,Junhua Jian,Ang Fu,Chao Tang,Yue Zou,Xunxin Chen,Jiuzhou Wang,Yong Yang,Jianming Zheng
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2022-05-05
卷期号:10 (19): 6217-6229
被引量:9
标识
DOI:10.1021/acssuschemeng.1c08707
摘要
Carbon fluoride (CFx) has attracted worldwide attention due to its high theoretical energy density (over 2000 Wh kg–1). However, the large electrochemical overpotential as resulted from the strong C–F covalent bond limits the full utilization of the intrinsic energy from CFx. In this work, a N,N-dimethylpropionamide (DMP) (along with propylene carbonate (PC) cosolvent)-based electrolyte is designed to boost the discharge plateau of lithium (Li)||CFx batteries. It is revealed that DMP molecules have powerful nucleophilicity and a strong solvating ability with Li+ ions by its high donor number (DN), which significantly weakens the C–F covalent bond and thus promotes the discharge voltage plateau and energy density. The optimized electrolyte, 1 M lithium tetrafluoroborate (LiBF4) dissolved in DMP and PC (8:2 in volume), achieves largely elevated discharge voltage plateau of 2.64 V (vs 2.41 V for carbonate-based electrolyte) and the superior energy density up to 2085 Wh kg–1 (vs 1888 Wh kg–1 for carbonate-based electrolyte) at a current density of 10 mA g–1. The superior electrochemical performance of CFx in the optimized electrolyte is further confirmed in pouch-type cells. Meanwhile, the CFx shows less electrode volume expansion, and good calendar life during storage at 60 °C in the optimized electrolyte, which holds great promise for practical applications.
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