化碳酸基电解质使主导的固体电解质能够用于高度可逆的金属阳极的间相
Wen-Hui Hou1, Pan Zhou1, Honghui Gu2
1Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
ACS nano
|August 14, 2023
概括
研究人员开发了一种用于金属电池的新型化电解质. 这种电解质稳定了固体电解质间相 (SEI),使金属阳极具有高效率和长周期寿命.
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:
- 金属阳极具有高能量密度,但由于固体电解质介相 (SEI) 形成不佳,因此遭受了状物生长.
- 电解质/阳极接口的不稳定性阻碍了金属电池的工业化.
研究的目的:
- 设计一种新型电解质,促进形成稳定,富含无机的SEI.
- 为了提高金属阳极的电化学和机械稳定性.
主要方法:
- 开发一种含有LiNO3.3的化碳酸盐基电解质.
- 研究离子分解路径以控制SEI组成.
- 电化学测试的酸对称电池和完整的电池 (酸NCM811,酸FePO4).
主要成果:
- 实现了一个均的,富含无机 (LiF,Li3N,Li2O) 的SEI.
- 对于金属阳极,证明了高库伦比克效率 (99%).
- 呈现出稳定的循环 (>1000小时在对称细胞,>100个周期在完整的细胞).
结论:
- 合理设计的电解质有效抑制了树突的生长,并提高了界面稳定性.
- 这种电解质是高度可逆性和高性能金属电池的有希望的候选者.
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