不易燃的全化电解质使高压和高安全的离子电池成为可能
Dongxu Ouyang1,2, Jun Guan1, Xiaotian Wan3
1College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
ACS applied materials & interfaces
|August 2, 2024
概括
一种新型的非易燃电解质FT46提高了离子电池的性能和高电压下的安全性. 它形成了稳定的被动化层,改善了循环,并防止了更安全,更耐用的电池的降解.
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:
- 高压离子电池需要稳定的电解质来防止降解.
- 化电解质有可能提高安全性和性能.
- 开发不可燃电解质对于先进的电池技术至关重要.
研究的目的:
- 为了研究高压离子电池的不可燃性全化电解质 (FT46) 的性能和安全性.
- 为了评估FT46电解质的循环稳定性和被动化层的形成.
- 在各种滥用条件下评估FT46的安全特性.
主要方法:
- 使用乙烯碳酸盐 (FEC) 和2,2,2-三乙烯) 碳酸盐 (TFEC) 制备FT46电解质,其质量比为 4:6.
- 在高电压 (3.0-4.5V) 下,对具有FT46的Li(Ni0.8Mn0.1Co0.1) O2//电池进行电化学测试.
- 将FT46与商业电解质和其他化电解质进行比较.
- 对被动化层组成和电极/电解质接口的分析.
主要成果:
- 与对照电解质相比,具有FT46的电池显示出明显改善的循环性能.
- 在电极表面形成了一个稳定,光滑,薄的富含LiF的被动化层.
- FT46表现出增强的Li+迁移速率和抑制的涂层.
- 在热,机械和电力滥用条件下,电解质显示出有希望的安全特性.
结论:
- 非易燃的FT46电解质使离子电池能够稳定高压运行.
- 这种卓越的性能归因于形成了一层保护性LiF丰富的被动化层和一个优化的溶解结构.
- FT46为开发更安全,更耐用的高能量密度离子电池提供了有前途的解决方案.
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