Novel Design Concepts of Efficient Mg-Ion Electrolytes toward High-Performance Magnesium-Selenium and Magnesium-Sulfur Batteries
Novel Design Concepts of Efficient Mg-Ion Electrolytes toward High-Performance Magnesium-Selenium and Magnesium-Sulfur Batteries
复制标题
高效镁离子电解液用于高性能镁硒和镁硫电池的新设计理念
DOI：
10.1002/aenm.201602055
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发表时间：
2017-06-07
影响因子：
27.8
通讯作者：
Chen, Liquan
中科院分区：
文献类型：
--
作者：
Zhang, Zhonghua;Cui, Zili;Chen, Liquan
开发高电压镁兼容电解质（>3.0V vs Mg）仍然是非水可充电镁电池领域最大的研发挑战。在这里，探索新的硼基镁盐在一个特定的方式突出的阴离子的影响的关键设计概念首次提出。通过三（2 H-六氟异丙基）硼酸盐和MgF 2在1，2-二甲氧基乙烷中的一步混合，成功地制备出了结构明确的硼中心阴离子镁电解质，并通过质谱、核磁共振和拉曼光谱对其阴离子结构进行了研究.第一个全面实用的锂离子电池电解质满足所有要求，易于合成，高离子电导率，宽电位窗口（3.5 V vs Mg），与亲电硫的兼容性，同时对纽扣电池组件无腐蚀性。当使用的硒/碳电解质，快速动力学硒/碳（Se/C）阴极实现了最佳的倍率性能和硫/碳（S/C）阴极表现出令人印象深刻的延长循环寿命比以前公布的报告。镁电解质为消除高压镁电池发展道路上的主要障碍提供了最有前途的途径，其设计概念可以为未来开发高压镁兼容电解质的方向提供指导。
Developing high-voltage Mg-compatible electrolytes (>3.0V vs Mg) still remains to be the biggest R&D challenge in the area of nonaqueous rechargeable Mg batteries. Here, the key design concepts toward exploring new boron-based Mg salts in a specific way of highlighting the implications of anions are proposed for the first time. The well-defined boron-centered anion-based magnesium electrolyte (BCM electrolyte) is successfully presented by facile one-step mixing of tris(2H-hexafluoroisopropyl) borate and MgF2 in 1,2-dimethoxyethane, in which the structures of anions have been thoroughly investigated via mass spectrometry accompanied by NMR and Raman spectra. The first all-round practical BCM electrolyte fulfills all requirements of easy synthesis, high ionic conductivity, wide potential window (3.5 V vs Mg), compatibility with electrophilic sulfur, and simultaneously noncorrosivity to coin cell assemblies. When utilizing the BCM electrolyte, the fast-kinetics selenium/carbon (Se/C) cathode achieves the best rate capability and the sulfur/carbon (S/C) cathode exhibits an impressive prolonged cycle life than previously published reports. The BCM electrolyte offers the most promising avenue to eliminate the major roadblocks on the way to high-voltage Mg batteries and the design concepts can shed light on future exploration directions toward high-voltage Mg-compatible electrolytes.