电解质重构通过阴离子/离子交叉协调,以实现高度可逆且易于储存的电解质重构
Xin Hou1,2, Shuo Wang3, Bo Wang4,5
1Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.
Angewandte Chemie (International ed. in English)
|October 18, 2024
概括
研究人员改进了使用硬碳 (HC) 阳极的离子电池 (SIB),通过重新配置电解质与甲基三酸 (MTPPB). 这提高了初始库伦比克效率 (ICE) 和跨温度的性能.
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:
- 硬碳 (HC) 材料是对离子电池 (SIB) 的有希望的阳极,因为它们的成本低,容量高.
- 电解质与HC的不良兼容性阻碍了初始库伦比克效率 (ICE) 和离子 (Na+) 运输动力学.
研究的目的:
- 通过解决电解质不兼容性,提高SIB中的HC阳极的性能.
- 通过电解质重新配置来改善接口化学和储能动力学.
主要方法:
- 基于硬和软酸和 (HSAB) 理论的电解质重构策略.
- 引入甲基基化物 (MTPPB),以创建与NaPF6.6的交叉协调溶解结构.
- 在SIB中分析HC阳极的界面化学,离子运输和电化学性能.
主要成果:
- 形成了具有低电阻的高分子固体电解质介相 (SEI).
- 由于削弱了Na+与溶剂的相互作用,促进了Na+脱溶动力学.
- 在HC电池中实现了96.6%的优异ICE,并在一个能量密度增加了15%的袋式电池中实现了出色的性能.
结论:
- 使用MTPPB进行电解质重构,有效优化HC阳极的界面化学和储存.
- 拟议的战略显著改善了SIB的ICE,速率能力和循环寿命,即使在低温下也是如此.
- 这项工作为设计具有高能量/功率密度和扩展操作温度范围的基于HC的实用SIB提供了指导.
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