轻微多元件兴奋剂诱导的结构秩序-混乱过渡对于高性能分层的氧化阴极
Hao Guo1, Chenglong Zhao2, Jianxiang Gao1
1China Institute of Atomic Energy, Beijing 102413, P. R. China.
ACS applied materials & interfaces
|July 13, 2023
概括
多元元素兴奋剂通过提高能量密度和循环稳定性来增强离子电池的O3型分层氧化物阴极. 这一策略减轻了结构性降解和异质性裂,为先进的电池开发铺平了道路.
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:
- O3型层氧化物对于离子电池至关重要,因为它们的能量密度很高.
- Ni2+/Ni4+氧化还原对提供多电子反应,但遭受Jahn-Teller扭曲,导致结构不稳定和容量衰减.
- 尽量减少有害的相位转换和结构降解是实现高性能离子电池阴极的关键.
研究的目的:
- 开发O3型层状氧化物阴极的多元元素兴奋剂策略,以提高电化学性能和结构稳定性.
- 调查多种兴奋剂的均分布如何减轻结构变化和异构性裂.
- 为了证明这种兴奋剂方法的有效性,使用特定的多元素兴奋氧化物成分.
主要方法:
- 合理设计和合成多元素合的O3型氧化物:Na0.9Ni0.25Cu0.05Mg0.05Zn0.05Fe0.05Al0.05Mn0.40Ti0.05Sn0.05O2.
- 电化学表征包括循环稳定性,速率能力和电压概况.
- 在电化学循环下分析结构变化和化学机械稳定性.
主要成果:
- 多元元素合阴极表现出改善的化学机械稳定性和延迟的O3-P3相位过渡.
- 与高Ni含量的阴极相比,合材料的可逆容量为120 mAh/g (2-4.0 V).
- 在500个循环后保持了90%的容量,并实现了卓越的循环稳定性和出色的速率能力 (>70%的容量在5.0°C).
结论:
- 多元元素兴奋剂是一种有效的策略,可以提高O3型离子电池的O3类层氧化物阴极的性能.
- 拟议的兴奋剂方法成功地减轻了结构降解和异型裂,改善了循环稳定性和能量密度.
- 这种方法对开发先进的离子电池材料具有重大前景.
关键词:
Na0.9Ni0.25Cu0.05Mg0.05Zn0.05Fe0.05Al0.05Mn0.40Ti0.05Sn0.05O2 这是一个非常好的方法.这是O3型的O3型.不同类型的网格菌株.多元元素兴奋剂多元元素兴奋剂顺序 - - 混乱过渡的过渡.更多相关视频
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