为4.6V无阳极金属电池配制电解质
Jiaojiao Deng1, Hai Lin2, Liang Hu3
1Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
Molecules (Basel, Switzerland)
|October 26, 2024
概括
研究人员为高压无阳极金属电池 (AFLMB) 开发了一种新型电解质,提高了阴极和阳极的稳定性,使寿命更长,能量密度更高.
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:
- 高压无阳极金属电池 (AFLMB) 的能量密度很高,但其电极和金属阳极的可逆性很差.
- 确保长周期寿命需要解决两个电池组件的稳定性问题.
研究的目的:
- 为高压AFLMBs制定一种新的缩电解质.
- 为了提高金属阳极和高压阴极的稳定性和可逆性.
- 改善AFLMBs的整体周期寿命和性能.
主要方法:
- 在混合溶剂 (DMC和FEC) 和 LiNO3 添加剂中配制一种带有双盐 (LiTFSI和LiDFOB) 的缩电解质.
- 研究电解质对金属阳极上固体电解质介相 (SEI) 形成的影响.
- 使用富含的高压阴极 (Li1.2Mn0.54Ni0.13Co0.13O2) 评估电解质的性能.
主要成果:
- 配方的电解质使得高涂/剥离Coulombic效率达到98.3%,这是由于LiF,Li3N丰富的SEI.
- 在高压阴极上,LiDFOB添加剂抑制了副作用.
- 电池在4.6V下经过80个周期的稳定运行,初始不可逆转的容量有助于延长周期寿命.
结论:
- 开发的电解质有效地提高了高压AFLMBs中的阴极和阳极的稳定性.
- 这种配方策略为为下一代金属电池创造先进的电解质提供了洞察力.
- 这项研究为高能量密度AFLMBs的实际应用铺平了道路.
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