在LiNi0.8Co0.1Mn0.1O2阴极中进行化学机械演变
Yi Zhang1, Shuaipeng Hao1, Fei Pei1
1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
National science review
|August 26, 2024
概括
在富含的正极材料 (NCM) 中的裂纹限制了电池的寿命. 这项研究使用光纤来监测应力演变,揭示了粒子异构性导致微裂和容量衰减,指导更好的电池设计.
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
- 电池技术 电池技术
背景情况:
- 富含的,,,,氧化物 (NCM) 材料对于高能量密度的离子电池至关重要.
- 多晶NCM材料在循环过程中会发生裂纹,导致容量衰减和电池寿命缩短.
- 了解电池运行期间的化学机械应力对于提高NCM性能至关重要.
研究的目的:
- 在电池循环过程中研究聚晶LiNi0.8Co0.1Mn0.1O2 (P-NCM811) 阴极中的应力演变.
- 为了将化学机械行为与微裂纹形成和容量衰减相关联.
- 引导NCM材料的设计,以提高电化学性能和循环寿命.
主要方法:
- 开发和实施具有微米分辨率的光纤传感器,用于*在操作*中检测压力.
- 将传感器集成到 P-NCM811 阴极中,以捕捉 (去) 化过程中的应力变化.
- 分析粒子异质性,结构应力,微裂纹生成和电化学性能之间的关系.
主要成果:
- 在P-NCM811的初级粒子中,异性质诱导结构应力,导致微裂和容量衰减.
- 初级粒子中的同位素性有效地降低了结构应力,防止了微裂纹的形成.
- 在P-NCM811中,有序排列结构导致了高电化学性能,在500个循环中保持了82%的容量.
结论:
- 这项研究为NCM材料在电池运行期间的化学机械演变提供了新的"操作"见解.
- 粒子同变性被确定为减轻压力诱导裂变和改善循环寿命的关键因素.
- 这些发现为设计高性能可充电电池的先进阴极材料提供了新的策略.
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