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化调制缺陷化学向高性能层阴极发展

Haoji Wang¹, Yidan Xu¹, Yongshuai Tong²

¹College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.

The journal of physical chemistry letters

|June 24, 2024

概括

通过增加氧气空缺来增强分层的过渡金属氧化物,可以提高电化学性能. 这一战略提高了高能量密度离子电池的循环稳定性和速率能力.

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:

层层的过渡金属氧化物往往有不良的循环稳定性和速率性能,特别是在高电荷状态下.
容量衰减和体积变化是开发高能量密度离子电池的重大挑战.

研究的目的:

为了研究调制缺陷度,特别是氧空缺对NaNi_1/3Fe_1/3Mn_1/3O₂分层氧化物的电化学行为的影响.
开发一种提高离子电池阴极性能的策略.

主要方法:

通过在富含氧气的大气中化来合理调节缺陷度,以增加散装空缺.
使用电子磁共振 (EPR) 进行表征,以确认增加的氧空缺.
电化学测试,包括循环性能和速率能力测量.
在现场进行X射线衍射 (XRD) 来监测循环过程中的体积变化.

主要成果:

在NaNi_1/3Fe_1/3Mn_1/3O₂阴极中氧气空缺的丰富显著提高了氧化还原反应的可逆性.
富含氧气空位的正极表现出更高的初始库伦比克效率 (90.0%) 和在初始充/放电期间减少体积变化.
证明了卓越的循环稳定性和速率性能,在0.5 C (145.2 mAh g-1) 的100个循环后,完整的电池保持了78.3%的容量.

结论:

增加氧气空位度是一种可行的策略,可以提高分层过渡金属氧化物阴极的电化学性能.
这种方法导致增强的循环稳定性,更好的速率能力和更高的库伦比克效率,用于离子电池.
这些发现为设计高能量密度Na+交天体提供了一条途径.

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