富含的酸盐是用于高压金属电池开发的离子电解质
Harshita Lohani1, Dale T Duncan2, Xueping Qin3
1Electrochemical Energy Laboratory, Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai, 400076, India.
Small (Weinheim an der Bergstrasse, Germany)
|June 17, 2024
概括
一个新的电解质与化酸 Ester 离子增强高压全细胞性能. 这种新型电解质促进了稳定的沉积,并在电极上形成保护界面,改善了电池循环寿命.
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:
- 高压全电池需要稳定的电解质,以长时间循环.
- 传统的电解质往往受到有限的电化学稳定性和高电压的副作用的影响.
- 开发强大的固体电解质介面 (SEI) 和阴极电解质介面 (CEI) 对于金属电池的性能至关重要.
研究的目的:
- 为了研究一种含有化酸乙酸阳离子 (Na[B(hfip) 4 . 3DME) 的新型电解质在高压全电池中的性能.
- 为了比较新型电解质与常规电解质 (Na[PF6]) 的性能.
- 阐明增强循环稳定的背后机制,重点关注相间形成.
主要方法:
- 用高压阴极 (NVPF@C@CNT,NFMO) 和金属阳极对全电池进行电化学测试.
- 使用表面表征技术分析阳极上的固体电解质介面 (SEI) 和阴极上的阴极电解质介面 (CEI).
- 研究电解质的溶解结构和溶解行为.
主要成果:
- 新型电解质 (1M Na[B(hfip) 4].3DME在EC:EMC中) 与传统电解质 (1M Na[PF6]在EC:EMC中) 相比,显著提高了循环性能.
- 在阳极上观察到均和密集的沉积,这种沉积由富含和的SEI促进.
- 在阴极上形成了一个强大的CEI,富含C-F,B-O和B-F元件,抑制了侧面反应并增强了被动化.
- 性溶解,涉及离子在相间形成,有助于观察到的稳定性.
结论:
- 新的化酸乙电解质能够在高压全细胞中提高性能.
- 在阳极和阴极上形成保护性,富含和的界面是长期循环稳定的关键.
- 这种电解质成分为开发先进的金属电池提供了有前途的途径.
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