电解质工程赋能电池在恶劣条件下实现高能量密度和低自放电
Yukang Xiao1, Xunxin Chen1, Junhua Jian2
1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Fujian Science & Technology Innovation Laboratory for Energy Materials of China (Tan Kah Kee Innovation Laboratory), Xiamen University, Xiamen, 361005, China.
Small (Weinheim an der Bergstrasse, Germany)
|November 10, 2023
概括
高能玉碳化物 (Li玉CFx) 电池在高温下实现低自放电,使用添加剂的N-甲基化 (NMP) 基电解质. 酸 (LiNO3) 显示出卓越的性能,使其具有高能量密度和稳定性.
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:
- 和碳化物蓄电池具有较高的理论能量密度 (>2000Wh/kg-1).
- 基于N-methylpyrrolidone (NMP) 的电解质增强能量密度,但面临自放电问题.
- 解决自放电对于实践应用 Liidiye CFx 电池至关重要.
研究的目的:
- 为了在升高的温度下实现低自放电 (LSD) 和高电化学性能,在升高的温度下将CFx电池放电.
- 研究NMP溶剂,乙烯基碳酸盐添加剂和双盐系统对电池稳定性和能量密度的影响.
- 为了最大限度地减少电流收集器腐蚀,并使金属阳极被动化.
主要方法:
- 使用N-methylpyrrolidone (NMP) 作为电解质溶剂.
- 包括乙烯碳酸盐添加剂和双盐系统 (LiBF4与二氧化,二氧化或LiNO3).
- 进行电化学性能测试和高温储存稳定性评估.
主要成果:
- 拟议的电解质配方显著减少了自放电,并提高了电化学性能.
- 酸 (LiNO3) 作为双盐系统的一个组成部分,产生了最显著的改进.
- 达到≈2400 Wh kg-1的能量密度,在60°C下300小时后接近0%的容量消失,在4000小时以上的开放电路电压稳定.
- 最小化了电流收集器腐蚀,并有效地使金属阳极无源化.
结论:
- 基于NMP的电解质与特定的添加剂和双盐系统可以在高温下实现高能量密度和低自放电的LCDCFx电池.
- 含有LiNO3的系统表现出卓越的稳定性和性能,解决了实际应用的关键挑战.
- 这项研究提供了一种可行的策略,用于开发先进的高温储能解决方案,使用LiidiyeCFx化学.
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