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高透诱导的动力学改进和相位过渡抑制在K-离子电池层状阴极中

Shiyong Chu^1,2, Caoyang Shao^1,2, Jiaming Tian^1,2

¹College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid-State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210023, China.

|December 19, 2023

概括

高设计增强了K-离子电池 (KIB) 的分层氧化物阴极,改善了动力学和稳定性. 这种新的方法为先进的储能解决方案提供了一个有希望的途径.

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:

层状氧化物是K-离子电池 (KIB) 的有希望的阴极材料,因为资源丰富,成本低廉.
目前的局限性包括缓慢的动力学和缺乏结构稳定性,阻碍了实际应用.

研究的目的:

通过引入高设计概念来解决分层KIB阴极的局限性.
为了合成和描述一种新的高层氧化物阴极材料.

主要方法:

通过高设计合成高层的K0.45Mn0.60Ni0.075Fe0.075Co0.075Ti0.10Cu0.05Mg0.025O2 (HE-KMO).
描述HE-KMO的电化学特性,包括动力学,结构稳定性和在宽电压窗口 (1.5-4.2V) 中的循环性能.
用低的K0.45MnO2 (KMO) 进行比较分析,以评估高的影响.

主要成果:

HE-KMO具有半金属氧化物特征,带宽狭窄 (0.19 eV),增强了电子导电.
高度使{010}活性面体的暴露增加了2.6倍,改善了K+扩散动力学.
与KMO (0.41%) 相比,HE-KMO表现出增强的结构稳定性,抑制相位过渡,并显示出优越的循环性能 (在200个循环中减少0.20%的容量下降).

结论:

高设计策略有效地提高了分层KIB阴极的电化学性能.
HE-KMO为下一代K离子电池提供了一个有前途的候选人,提供了增强的动力学和长期稳定性.

关键词:

这种电池是K-离子电池.高的战略高的战略.运动学的动力学.层层的氧化物阴极是层层的氧化物阴极.阶段过渡阶段过渡

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