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用于高压离子电池的硫烯基阻燃电解质

Xuanlong He¹, Jie Peng¹, Qingyun Lin²

¹Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, People's Republic of China.

Nano-micro letters

|October 18, 2024

概括

研究人员为离子电池 (SIB) 开发了一种新的电解质,可以提高稳定性. 这种局部高度的电解质在正极上形成了一层保护层,使其能够长时间保持高压性能并提高电池的安全性.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

离子电池 (SIB) 是下一代储能电池的前景.
电极/电解质介面相的不稳定性,特别是阴极-电解质介面相 (CEI),阻碍了SIB的发展.
不稳定的CEI会导致电解质副作用,金属漏,容量衰减,特别是在高电压下.

研究的目的:

为应对高压SIB中不稳定的CEI的挑战.
使用局部高度电解质开发稳定的CEI.
为了提高O3型分层氧化物阴极的循环稳定性和安全性.

主要方法:

将一种高度耐氧化的硫溶剂与一种非溶剂稀释剂 (1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether) 结合在一起.
在正极上形成一个薄,密集和均的CEI.
使用开发的电解质对O3型分层氧化物阴极NaNi1 / 3Mn1 / 3Fe1 / 3O2 (NaNMF) 进行电化学测试.

主要成果:

局部化的高度电解质表现出极好的氧化稳定性.
一个稳定,薄,密集和同质的CEI成功形成.
NaNMF阴极实现了稳定的循环,在1C的300个循环后保持了79.48%的容量,在2C的400个循环后保持了81.15%,即使在4.2V的高电压下也是如此.
电解质的非易燃性质提高了电池的安全性.

结论:

开发的局部高度电解质有效地稳定了高压SIB中的CEI.
这种方法使O3型分层氧化物阴极能够稳定循环.
该研究提出了一种可行的策略,用于应用基于硫的电解质,并为SIB设计先进的高压电解质.

关键词:

阻燃剂是一种阻燃剂.高电压的高电压的高电压有层层的氧化物阴极.离子电池是一种离子电池.基于硫酸盐的电解质

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