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双乙烯碳酸盐能否替代乙烯碳酸盐在高电压下用于高性能离子电池?

Jun Guan¹, Dongxu Ouyang^1,2, Xiaotian Wan³

¹College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, China.

ACS applied materials & interfaces

|March 25, 2025

概括

与乙烯碳酸盐 (FEC) 相比,二乙烯碳酸盐 (DFEC) 在离子电池中提供了更好的高压性能. DFEC电解质提高了稳定性和安全性,使其成为先进电池应用的有希望的替代品.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
储能储能储能储能储能储能

背景情况:

优化电解质对于开发高压,高性能离子电池至关重要.
乙烯碳酸盐 (FEC) 是常用的,但在高电压下有局限性.

研究的目的:

评估二乙烯碳酸盐 (DFEC) 作为高压离子电池中FEC的潜在替代品.
为了比较基于DFEC的电解质与基于FEC的对应物的性能和安全性.

主要方法:

电解质配方,含有不同度的盐.
在高压下对离子电池进行电化学性能测试.
分析电极-电解质接口和被动化层特性.
基于DFEC的电解质和电池的安全测试.

主要成果:

基于DFEC的电解质,特别是适度增加的盐,在高电压下优于基于FEC的电解质.
在高达4.0V的LiFePO4系统中,DFEC电解质表现出高性能.
低的DFEC-Li+结合能量促进了丰富的离子溶解结构,促进了离子运输,形成了强大的有机丰富的被动化层.
由于DFEC的优越薄膜特性,它产生了一层薄,光滑,稳定的被动化层,防止副作用,增强接口稳定性.
基于DFEC的电解质和电池具有增强的安全特性.

结论:

对于高压离子电池来说,DFEC是FEC的可行和优质替代品.
DFEC电解质可以提高电化学性能,接口稳定性和安全性.
这些发现支持DFEC用于下一代高能量密度电池技术的使用.

关键词:

降解降解降解降解降解降解.二乙烯碳酸二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二高电压的高电压的高电压离子电池是离子电池的一种.在安全方面,安全是安全的.

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