通过优先吸收操纵接口稳定性,以获得高度稳定和安全的4.6V LiCoO2 阴极
Long Chen1, Xin He2, Yiqing Chen1
1Key Laboratory of Hydraulic Machinery Transients, Ministry of Education, School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, People's Republic of China.
Nano-micro letters
|March 12, 2025
概括
研究人员开发了一种用于高压氧化 (LCO) 电池的新电解质. 这种电解质提高了稳定性和安全性,使电池寿命更长,温度使用范围更广.
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:
- 增加氧化 (LCO) 阴极的上切断电压可以提高可逆容量,但会导致结构不稳定性,接口问题和安全问题.
- 开发稳定的阴极/电解质接口对于高压LCO (HV-LCO) 性能至关重要,但接口化学仍然不明,使电解质设计复杂化.
研究的目的:
- 为HV-LCO电池提出一种新的电解质设计策略.
- 根据最高占成的分子轨道能量水平和LCO吸收能量来确定最佳溶剂.
- 通过电解质工程来提高HV-LCO阴极的性能和安全性.
主要方法:
- 使用计算参数选潜在的电解质溶剂:最高占成的分子轨道能量水平和LCO吸收能量.
- 合成并测试了用Tris (2,2,2-trifluoroethyl) 酸盐作为最佳溶剂的电解质.
- 使用开发的电解质制造和评估石墨的HV-LCO囊细胞.
主要成果:
- 三 (2,2,2-三乙烯) 酸盐在LCO上促进富含LiF的阴极/电解质接口层,这是由于其低脱能障碍.
- 工程界面抑制了相位过渡,并改善了Li+扩散动力学.
- 在700个循环后,HV-LCO袋式电池显示了85.3%的容量保留,适应广泛的温度 (-60-80°C),并通过了指甲透安全测试.
结论:
- 新的电解质设计策略有效地提高了HV-LCO阴极的稳定性和性能.
- 三 (2,2,2-三乙烯) 酸盐被认为是构建高能离子电池稳定接口的有希望的溶剂.
- 这项工作为合理的电解质设计提供了见解,以改善先进的离子电池的循环寿命,温度范围和安全性.
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