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新型低应变层叠/岩盐交织的高能离子电池的阴极

Lifeng Xu^1,2, Shi Chen¹, Yuefeng Su^1,2

¹Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.

ACS applied materials & interfaces

|November 16, 2023

概括

这项研究引入了一种新的低成本,分层/岩盐交织的阴极材料,用于离子电池. 它通过使用而不是贵金属来实现高容量和稳定性,从而实现高效的离子存储.

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
固态化学固态化学

背景情况:

富含的阴极材料具有高容量,但具有体积变化和导电性差等缺点.
以前的交织阴极使用昂贵的贵重元素,限制了工业用途.
开发具有成本效益,高性能阴极材料对于先进的离子电池至关重要.

研究的目的:

设计和合成一种新的,低成本的三元丰富的阴极材料.
研究新材料的结构和电化学特性.
探索使用3D过渡金属来替代阴极设计中的贵重元素的潜力.

主要方法:

中子衍射和传输电子显微镜用于结构分析.
X射线吸收光谱和共振无弹性X射线散射用于探测氧化还原机制.
在现场进行X射线衍射,研究循环过程中的结构演变.
电化学测试以评估离子的可逆性和容量.

主要成果:

一种分层/岩盐交织的正极材料Li1.15Ru0.25Mn0.2Ni0.4O2已成功合成.
该材料表现出超高的离子可逆性 (231.1 mAh g-1),并利用了阴离子和阴离子的氧化还原作用.
在充放电周期中观察到低应变结构演变.
可调节含量为进一步优化提供了一条途径.

结论:

开发的低成本互生阴极材料表现出优异的电化学性能和结构稳定性.
用丰富的3D过渡金属 (如Mn) 取代贵金属是先进电池材料的可行策略.
这项工作为设计下一代高能离子电池阴极提供了宝贵的见解.

关键词:

离子电池是一种离子电池.阴离子和阴离子氧化还原剂.交织在一起的阴极.低应变低应变的压力同步子/中子的表征.

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