在操作中成像LiCoO2纳米晶体与布拉格连贯X射线衍射
David Serban1,2, Daniel G Porter3, Ahmed H Mokhtar4
1Department of Physics & Astronomy, University of Southampton, Southampton, UK. das1g13@soton.ac.uk.
Communications chemistry
|October 28, 2024
概括
研究人员使用X射线衍射成像研究离子电池中的氧化物 (LCO). 他们观察了循环期间的域动态,揭示了限制电池性能和寿命的低效率.
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
- 纳米技术 纳米技术
背景情况:
- 氧化 (LCO) 是商用离子电池 (LIB) 中的主要阴极材料.
- 尽管LCO的稳定性很高,但LIB的业绩改善面临着挑战.
- 优化LCO电池循环对于推进能源存储至关重要.
研究的目的:
- 在电池循环期间调查LCO在操作中的结构性质.
- 确定导致LCO电池效率低下的机制.
- 为优化LCO电池性能和寿命提供见解.
主要方法:
- 利用布拉格连贯X射线衍射成像用于手术分析.
- 研究了一个单一的LCO纳米晶体 (约. 1.6×1.4×1.3μm3) 的情况.
- 重建了X射线散射相变化以映射原子位移.
主要成果:
- 在充电过程中观察到LCO纳米晶体表面的紧张域的形成,扩张和碎片化.
- 在充电过程中确定了0.467 Å的最大相对格子移位.
- 在放电过程中观察到逆域动态,较低的最大相对格子位移 (0.226 Å).
结论:
- 该研究揭示了在充电/放电周期期间LCO网格内的应变诱导域动态.
- 这些领域动态有助于增加LCO电池的低效率.
- 了解这些过程是制定提高LCO电池循环和稳定性的策略的关键.
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