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一个电解质与较少占用空间的稀释剂在阴极内海尔姆霍尔茨平面稳定4.6V离子电池的电解质

Mingming Fang¹, Bingyuan Du², Xinran Zhang¹

¹Frontiers Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.

Angewandte Chemie (International ed. in English)

|November 28, 2023

概括

局部化高度电解质 (LHCE) 与m-fluorotoluene (mFT) 稀释剂可以提高高压离子电池的性能. 这种新的方法确保了统一的阴极电解质间相 (CEI),提高了电池的稳定性和寿命.

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:

提高工作电压对于最大限度地提高离子电池 (LIB) 的能量密度至关重要.
局部化高度电解质 (LHCE) 由于其强溶解和稳定的介面相,对高压LIB有希望.
稀释剂在LHCE中的作用及其对高压下阴极电解质介相 (CEI) 的影响仍然是关键的研究领域.

研究的目的:

系统地调查LHCE中的稀释剂在高工作电压下对CEI形成的影响.
阐明内部海尔姆霍尔茨平面 (IHP) 中的离子-稀释剂相互作用影响CEI均性和电池性能的机制.
开发和验证一种新的稀释剂策略,以优化高压LIB性能.

主要方法:

对局部高度电解质 (LHCE) 对阴极电解质介相 (CEI) 形成的稀释剂效应的系统研究.
使用m-fluorotoluene (mFT) 作为LHCE中的稀释剂与二氧化 (LiDFOB) 分析内赫尔姆霍尔茨平面 (IHP) 内的相互作用.
制造并测试了4.6V级袋式电池 (石墨红色体LiNi0.8Co0.1Mn0.1O2),以评估性能改进.

主要成果:

确定IHP中的特定离子稀释剂配对导致CEI不均和高压LIB降解.
证明了m-托 (mFT) 作为稀释剂促进了均的,富含离子的CEI,这是由于与甲相比,H-B相互作用较弱的原因.
在1.2-Ah袋式电池中,在4.6V运行时,在130个周期内实现了90.4%的容量保留,展示了增强的稳定性和性能.

结论:

IHP中的稀释剂和离子之间的相互作用是影响CEI形成和高压LIB稳定的关键因素.
在LHCE中使用m-fluorotoluene (mFT) 作为稀释剂为创建统一的CEI和提高电池性能提供了可行的策略.
这项研究为CEI形成机制提供了新的见解,并提出了优化下一代高压离子电池的有效策略.

关键词:

阴极电解质相间介质的电解质.稀释剂-离子相互作用高电压是什么意思高电压内海尔姆霍尔茨平面的平面离子电池是一种离子电池.

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