在离子电池的分层过渡金属氧化物中,由粒径和格子扭曲调节的相位过渡
Xuan Yang1,2, Lihan Zhang3, Guozhuang Liu4
1University of Science and Technology Beijing, Beijing 100083, PR China.
ACS applied materials & interfaces
|July 26, 2024
概括
控制离子电池阴极材料中的颗粒大小,例如分层过渡金属氧化物,可以提高循环稳定性. 较小的颗粒减少了有害的相位过渡,提高了电池的性能和寿命.
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:
- 多层过渡金属氧化物是低成本离子电池的有希望的阴极材料.
- 这些材料的相位过渡会导致体积变化,限制周期寿命.
研究的目的:
- 研究O3型NaNi1 / 3Fe1 / 3Mn1 / 3O2 (NFM) 阴极材料中的粒度大小和相变行为之间的关系.
- 通过控制材料微观结构来提高离子电池的循环稳定性.
主要方法:
- 在受控温度下合成O3型NaNi1 / 3Fe1 / 3Mn1 / 3O2 (NFM),以改变粒径.
- 电化学测试用于评估电池性能和循环稳定性.
- 分析相位过渡行为和结构变化.
主要成果:
- 在NFM材料中,较小的颗粒大小与抑制的O3-P3-O3相变相关.
- 较小的颗粒大小和晶格扭曲使循环稳定性在100个循环中从77.4%提高到96.2%.
- 较小的颗粒减轻了颗粒内部的裂,改善了结构完整性.
结论:
- 颗粒大小是影响分层离子电池阴极相位过渡动态和循环稳定的关键因素.
- 控制合成以实现更小的粒度提供了一种可行的策略,以提高离子电池的耐用性.
- 这项工作为减轻用于储能应用的多层阴极材料的结构不稳定性提供了洞察力.
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