Synthesis of Fire-Extinguishing High-Voltage Electrolytes for Safe Batteries

安全电池用高压灭火电解质的合成

• 批准号: 18F18332
• 负责人: 山田 淳夫
• 金额: $ 1.41万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2018
• 资助国家: 日本
• 起止时间: 2018-11-09 至 2021-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18F18332/
• 关键词: Lithium-ion battery; nonflammable electrolyte; high-voltage; SEI formation; cyclic phosphate; electrolyte; non-flammable

The lack of a suitable alternative solvent has hindered further exploration of new functional electrolytes. Herein we design and synthesize a fluorinated cyclic phosphate solvent, 2-(2,2,2-trifluoroethoxy)-1,3,2-dioxaphospholane 2-oxide (TFEP), for use in LIBs. An electrolyte formula composed of 0.95 M LiN(SO2F)2 in TFEP/2,2,2-trifluoroethyl methyl carbonate shows excellent non-flammability with zero self-extinguishing time and enables the highly stable operation of graphite anodes (ca. 0.1 V vs lithium) and high-voltage LiNi0.5Mn1.5O4 cathodes (ca. 4.7 V vs lithium), thereby outperforming the traditional electrolytes. This work opens new frontiers in electrolyte developments toward safe LIBs with higher energy densities, which was recently accepted for publication on Nature Energy.

缺乏合适的替代溶剂阻碍了对新功能电解质的进一步探索。在此，我们设计并合成了一种用于锂离子电池的氟化环状磷酸酯溶剂2-(2,2,2-三氟乙氧基)-1,3,2-二氧杂磷烷2-氧化物(TFEP)。由 TFEP/2,2,2-三氟乙基甲基碳酸酯中的 0.95 M LiN(SO2F)2 组成的电解液配方具有优异的不可燃性和零自熄时间，并可实现石墨阳极（相对于锂约 0.1 V）和高压 LiNi0.5Mn1.5O4 阴极（约 4.7 V 相对于锂）的高度稳定运行。 锂），从而优于传统电解质。这项工作为具有更高能量密度的安全锂离子电池的电解质开发开辟了新领域，该研究最近被 Nature Energy 接受发表。

项目成果

環状リン酸エステルを含む二次電池用電解液

含有环状磷酸酯的二次电池用电解液

• 发表时间: 2020

A cyclic phosphate-based battery electrolyte for high voltage and safe operation

• DOI: 10.1038/s41560-020-0567-z
• 发表时间: 2020-03
• 期刊: Nature Energy
• 影响因子: 56.7
• 作者: Qifeng Zheng;Yuki Yamada;Rui Shang;Seongjae Ko;Yun-Yang Lee;Kijae Kim;E. Nakamura;A. Yamada