在离子电池的分层氧化物阴极中进行全电压范围的固体溶液反应
Meng Ren1, Zhuo Zhu1, Zhaohui Liang1
1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, China.
Small (Weinheim an der Bergstrasse, Germany)
|August 21, 2023
概括
这项研究引入了一种用于离子电池 (SIB) 的新型分层氧化阴极,可以避免相位过渡. 该材料具有出色的循环稳定性和速度能力,为先进的SIB铺平了道路.
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 (LMO) 是离子电池 (SIB) 的有希望的阴极材料.
- 在Mn3+中,Jahn-Teller效应会导致结构扭曲和相变,限制SIB的性能.
- 开发无相变的LMOs对于稳定高效的离子电池运行至关重要.
研究的目的:
- 为SIBs合成一种新的六角形P2型层叠的氧化阴极材料.
- 调查结构和电化学机制,使无相变的操作.
- 为了提高离子电池的循环稳定性和速率能力.
主要方法:
- 六角P2-Na0.643Li0.078Mn0.827Ti0.095O2通过将Li和Ti纳入P'2-Na0.67MnO2.2.中的合成
- 电化学表征包括循环稳定性和速率能力测试.
- 结构分析以了解Li和Ti在稳定六角相位和抑制相位过渡中的作用.
主要成果:
- 合成的材料,P2-Na0.643Li0.078Mn0.827Ti0.095O2,在一个广泛的电压范围 (1.84.3V) 上表现出无相变的固体溶液反应.
- 的结合增强了Mn-O键的共价性,有利于六边形相,而Ti-O键减少了Na+相互作用.
- 该材料表现出极好的循环稳定性 (在500个循环后保持90%的容量) 和高速率能力 (89mAhg-1在2000mAg-1).
- 在骑自行车时观察到1.49%的最小体积变化.
结论:
- 和联合剂有效地抑制了SIBs层叠的氧化物中的Jahn-Teller效应和相变.
- 开发的正极材料为高性能和持久的离子电池提供了一个有前途的解决方案.
- 这项工作为下一代储能系统设计先进的正极材料提供了洞察力.
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