用于锂金属电池的浓缩双（氟磺酰）亚胺锂电解质
Concentrated LiODFB Electrolyte for Lithium Metal Batteries.
作者信息
Yu Juan, Gao Na, Peng Jiaxin, Ma Nani, Liu Xiaoyan, Shen Chao, Xie Keyu, Fang Zhao
机构信息
School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an, China.
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, China.
出版信息
Front Chem. 2019 Jul 18;7:494. doi: 10.3389/fchem.2019.00494. eCollection 2019.
Nowadays, lithium (Li) metal batteries arouse widespread concerns due to its ultrahigh specific capacity (3,860 mAh g). However, the growth of Li dendrites has always limited their industrial development. In this paper, the use of concentrated electrolyte with lithium difluoro(oxalate)borate (LiODFB) salt in 1, 2-dimethoxyethane (DME) enables the good cycling of a Li metal anode at high Coulombic efficiency (up to 98.1%) without dendrite growth. Furthermore, a Li/Li cell can be cycled at 1 mA cm for over 3,000 h. Besides, compared to conventional LiPF-carbonate electrolyte, Li/LiFePO cells with 4 M LiODFB-DME exhibit superior electrochemical performances, especially at high temperature (65°C). These outstanding performances can be certified to the increased availability of Li concentration and the merits of LiODFB salt. We believe that the concentrated LiODFB electrolyte is help to enable practical applications for Li metal anode in rechargeable batteries.
如今，锂（Li）金属电池因其超高的比容量（3860 mAh g）而引起广泛关注。然而，锂枝晶的生长一直限制着它们的工业发展。在本文中，在1,2 - 二甲氧基乙烷（DME）中使用含二氟（草酸）硼酸锂（LiODFB）盐的浓电解质能够使锂金属阳极在高库仑效率（高达98.1%）下良好循环且无枝晶生长。此外，锂/锂电池可以在1 mA cm下循环超过3000小时。此外，与传统的LiPF - 碳酸盐电解质相比，含4 M LiODFB - DME的锂/磷酸铁锂（LiFePO）电池表现出优异的电化学性能，尤其是在高温（65°C）下。这些优异性能可归因于Li浓度可用性的提高以及LiODFB盐的优点。我们相信，浓LiODFB电解质有助于实现锂金属阳极在可充电电池中的实际应用。
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