局部和以太基电解质具有氧化稳定性 用于基于丰富阴极的金属电池
John Holoubek1, Haodong Liu1, Qizhang Yan1
1Department of NanoEngineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States.
ACS applied materials & interfaces
|September 19, 2023
概括
一种新型局部高度电解质 (LHCE) 能够在高能金属电池中实现稳定的循环,具有丰富,丰富的阴极. 这一突破解决了先进电池设计的电解质关键挑战.
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
- 电池技术 电池技术
背景情况:
- 富含,富含 (LMR) 层叠氧化物阴极为金属电池提供高能量密度和更低的成本.
- LMR阴极和金属阳极的高运行潜力对电解质稳定性构成重大挑战.
- 开发强大的电解质对于实现这些先进电池系统的潜力至关重要.
研究的目的:
- 为了研究局部高度电解质 (LHCE) 对Li的有效性.
- 了解LHCE在高压电池应用中的设计原理和性能机制.
- 为了证明LHCE在全细胞配置中的实际可行性.
主要方法:
- 使用以太溶剂设计和合成局部高度电解质 (LHCE).
- 使用LHCE和碳酸盐控制电解质的Lihydro LMR细胞的电化学循环.
- 分子动力学 (MD) 模拟以阐明离子溶解结构.
- 使用X射线光电子谱学 (XPS) 和低温传输电子显微镜 (cryo-TEM) 进行表面分析.
主要成果:
- 该LHCE表现出极好的氧化稳定性,这对于LMR阴极性能至关重要.
- MD模拟显示,聚合的Li+/离子溶解结构稳定了电解质.
- 在100个循环后,LHCE实现了95.8%的容量保留,性能优于控制器.
- 使用LHCE的全电池 (4 mAh cm-2 LMRidiye2× Li) 在80个循环后保持了87%的容量.
结论:
- 一个适当设计的LHCE可以克服高压电解质电池中的电解质挑战.
- 盐/溶剂比对LHCE的氧化稳定性至关重要,由溶解结构驱动.
- 低金属电池为开发高能耗,低成本的金属电池提供了一个有前途的途径.
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