热力学自发间歇的H3O+使LiMn2O4在水性电池中具有增强的质子耐受性
Jiangfeng Huang1, Liang Xue2, Yin Huang1
1Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, China.
Nature communications
|August 6, 2024
概括
在水性离子电池 (ALIB) 中,将质子插入LiMn2O4 (LMO) 提供稳定性,但阻碍导电性. 控制质子含量可优化LMO性能,用于实际的ALIB应用.
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
- 电池技术 电池技术
背景情况:
- Mn2O4 (LMO) 是水性离子电池 (ALIB) 的一个有前途的阴极材料.
- 由于不清楚的降解机制,ALIB中的LMO循环性能差,妨碍了其实际应用.
- 水性环境中的电极/电解质接口相互作用对于LMO来说至关重要,但尚未得到充分研究.
研究的目的:
- 为了研究H3O+在水性电解质循环过程中插入LMO.
- 阐明H3O+在LMO结构稳定性和Li+导电性中的双重作用.
- 开发控制H3O+含量的策略,以提高ALIB中的LMO性能.
主要方法:
- 用电化学分析来研究电池性能.
- 进行结构性表征来分析物质变化.
- 使用第一原则计算来理解接口机制.
- 用水性电解质修饰来调节键网络.
主要成果:
- 在ALIB循环过程中证明了H3O+在LMO中的插入.
- 揭示了水晶H3O+通过Mn4+丰富的外增强结构稳定性,但过多的H3O+阻碍了Li+导电性.
- 证明调节H3O+含量可以提高LMO的结构稳定性,同时保持Li+扩散.
结论:
- H3O+的间隙显著影响LMO的结构演变和ALIBs中的电化学性能.
- 通过修改电解质键网络来控制晶体H3O+含量是一个可行的策略.
- 这种方法可以提高结构稳定性,并保持Li +导电性,以改善基于LMO的ALIB.
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