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一个热力学稳定的O2型阴极,具有可逆的O2-P2相位过渡,用于先进的离子电池

Peiyu Hou¹, Zezhou Lin², Mohan Dong¹

¹School of Physics and Technology, University of Jinan, Jinan 250022, China.

Journal of colloid and interface science

|July 1, 2023

概括

研究人员使用一种新的离子交换方法开发了用于离子电池 (SIB) 的稳定O2型阴极. 这种阴极显示出优异的结构稳定性和长期循环性能,推进了用于储能和电动汽车的SIB技术.

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:

由于其低成本,离子电池 (SIB) 对可再生能源和电动汽车具有前景.
为SIB开发稳定的O2型阴极具有挑战性,因为它们通常是不稳定的中间体.
现有的P2型阴极在循环过程中经历了显著的体积变化,限制了它们的寿命.

研究的目的:

为SIBs合成一种热力学稳定的O2型阴极材料.
研究新型O2型阴极的电化学特性和结构稳定性.
为了证明这种新阴极在先进的SIB应用中的潜力.

主要方法:

通过Na/Li离子交换从P2类型氧化物合成稳定的O2型阴极,在二元盐系统中.
描述了材料的结构和电化学性能,包括容量,循环稳定性和相变.
使用晶体学数据分析了O2-P2阶段过渡期间的体积变化.

主要成果:

实现了热力学稳定的O2型阴极材料.
观察到一种高度可逆的O2-P2相位过渡,体积变化很小,约为11%.
在1C的300个循环后,证明了~100mAh/g的可逆容量和87.3%的容量保留.

结论:

新型O2型阴极表现出优越的结构稳定性,原因是循环过程中体积变化减少.
这种材料具有高容量和优良的长期循环稳定性,使其适用于先进的SIB.
这些发现为开发SIBs的新型高性能阴极材料铺平了道路.

关键词:

晶体调节晶体调节有层的氧化物阴极是有层的.阶段过渡阶段过渡离子电池是一种离子电池.结构稳定性结构稳定性

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