稳定分层氧化物阴极基于可充电二次电池的通用表面残留转换化学
Yi-Feng Liu1,2, Han-Xiao Liu1,3, Yan-Fang Zhu1,3
1College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|January 23, 2025
概括
研究人员开发了一种通用策略,将分层过渡金属氧化物 (LTMOs) 上的剩余转化为稳定的聚合物涂层. 这通过改善离子和离子电池的动力学和循环稳定性来提高电池性能.
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
- 电池技术 电池技术
背景情况:
- 多层过渡金属氧化物 (LTMO) 为可充电电池提供了高的理论容量.
- 由于氧气演变和不稳定的接口,LTMOs面临诸如容量衰减,电压衰减和低动力学等挑战.
- 在LTMOs上的剩余性物种阻碍了它们的实际应用.
研究的目的:
- 制定一项通用战略,在现场将表面残留转化为LTMOs的稳定聚合物涂层.
- 解决接口不稳定性和提高LTMOs的电化学性能.
- 为了证明该战略对各种LTMOs的广泛适用性.
主要方法:
- 用化 (NH4F) 处理LTMO,以消耗剩余的.
- 使用产生的化物形成聚合物涂层,诱导四二的环开聚合.
- 在离子电池中涂层丰富的Mn基阴极材料 (LRM) 的实施和测试.
- 该策略应用于用于离子电池的富含的LTMOs.
主要成果:
- 聚合物涂层显著降低了电压歇斯底里,并提高了离子电池的动力学和循环稳定性.
- 涂层有效地减轻了表面晶格的氧气释放和分层到线圈相位过渡.
- 观察到最小的机械降解和表面寄生反应.
- 该策略对于对空气敏感的富的LTMOs证明了其有效性,展示了其普遍性.
结论:
- 拟议的战略为克服LTMOs的剩余和界面不稳定性问题提供了一个有希望的解决方案.
- 在现场的聚合物涂层提高了基于LTMO的电池的性能和稳定性.
- 这种方法证明了离子和离子电池系统的广泛适用性.
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