用于高性能金属电池的三重功能的性溶剂添加剂
Wenqiang Fang1, Zuxin Wen1, Fenglin Wang1
1School of Materials Science and Engineering, Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province, Central South University, Changsha 410083, China.
Science bulletin
|February 29, 2024
概括
一种新的N-甲基胺 (NmAc) 和LiNO3添加剂增强了高压金属电池 (LMB) 的碳酸盐电解质. 这提高了稳定性,降低了腐蚀,并使Li Radius NCM622电池的性能更好.
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:
- 高压金属电池 (LMB) 需要稳定的碳酸盐电解质.
- 传统的电解质遭受不稳定的介面和腐蚀性副产品,如酸 (HF).
研究的目的:
- 开发一种具有三重功能的性溶剂添加剂,以提高碳酸电解质的稳定性和对LMBs的兼容性.
- 为了应对传统电解质中不稳定的电极接口和高频生成的挑战.
主要方法:
- 在碳酸盐电解质中将N-甲基胺 (NmAc) 与LiNO3结合为欧性溶剂添加剂.
- 调查Li+溶解结构,涂层形态以及与PF5.5的相互作用.
- 评估阴极电解质间相 (CEI) 特性和过渡金属溶解.
- 电化学性能测试的基基LiNi0.6Co0.2Mn0.2O2 (NCM622) 电池的电化学性能测试.
主要成果:
- NmAc显著改善了LiNO3的溶解性,调节了Li+溶解,并促进了密集的Li.
- NmAc有效地与PF5复合,减轻HF生成并减少电解质腐蚀性.
- 优化的CEI层抑制了结构降解和过渡金属溶解.
- 基基NCM622细胞表现出优异的循环可逆性和速度能力与修改过的电解质.
结论:
- 欧性溶剂添加剂,特别是NmAc与LiNO3,为稳定高压LMB中的碳酸盐电解质提供了一个有希望的策略.
- 这种方法提高了电解质兼容性,减少了降解,并提高了电池性能.
- 这些发现为推进高压LMB的实际应用提供了理由.
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