混合密度功能理论 氧释放和溶剂分解动力学在LiNiO2表面上的比较
1Sandia National Laboratories, MS 0750, Albuquerque, New Mexico 87185, United States.
The journal of physical chemistry letters
|April 24, 2024
概括
高阴极材料通过电解质反应降解,而不是氧气释放. 计算分析显示,乙烯碳酸盐的分解速度更快,指导未来电动汽车电池的开发.
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
- 计算化学的计算化学
背景情况:
- 高层氧化物是电动汽车电池的关键.
- 界面反应性和氧气释放是主要的降解问题.
- 了解降解机制对于缓解至关重要.
研究的目的:
- 比较LiNiO2表面与乙烯碳酸盐 (EC) 和O2释放的反应动力学.
- 确定主导的界面降解途径.
- 调查反应性氧物种的作用.
主要方法:
- 选混合密度函数 (HSE06) 的计算.
- 对LiNiO2 (001) 和 (104) 方面进行分析.
- 与现有的液相反应数据进行比较.
主要成果:
- 乙烯碳酸盐的氧化分解具有较低的激活能量,而不是O2释放在LiNiO2表面.
- 计算挑战了在电解质降解中"反应性O2"的意义.
- 建议采用"局部结构"方法来建模表面反应性.
结论:
- 电解质分解,特别是EC氧化,是比高阴极的O2释放更重要的降解途径.
- 单片氧 (1O2) 在电解质降解中的作用是有问题的.
- 未来的研究应该专注于减轻直接的电解质-阴极相互作用,并在建模中考虑局部结构效应.
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