关于一个带有丰富的多层氧化物阴极的囊细胞的可循环容量色过程的新信息
Jinhong Luo1,2, Jinghao Liu1,2, Zilong Su1,2
1China Automotive Battery Research Institute Co., Ltd No. 11 Xingke Dong Street, Huairou District Beijing 101407 China quanwei@glabat.com.
RSC advances
|July 18, 2024
概括
富层氧化物 (LLOs) 由于结构变化而表现出容量色. 早期的色源于接口问题,而后期的色主要是由活性物质损失和散装降解引起的.
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:
- 富层氧化物 (LLOs) 是高能离子电池的有希望的阴极材料.
- 目前的研究往往侧重于微观降解机制,忽视袋细胞性能影响.
- 需要对实际电池配置内的LLOs容量衰减的定量理解.
研究的目的:
- 为袋式电池中的LLOs提出一种新的过渡型容量色机制.
- 量化分析不同降解因子在整个循环生命周期中的贡献.
- 为了将结构演变与电化学性能变化相关联.
主要方法:
- 在袋式电池中LLOs的电化学循环.
- 分析关键的电化学参数 (极化,电阻) 的演变.
- 结构特征以确定降解模式.
主要成果:
- 在LLOs中,产能色遵循过渡型机制.
- 早期到中期循环阶段:由阴极电解质接口 (CEI) 增长和表面退化驱动的接口极化 (67%的容量损失).
- 中期到晚期的循环阶段:由于散装降解 (氧气释放,/混合,旋转形成) 导致活性物质损失 (61%的容量损失).
结论:
- 该研究确定了LLO袋细胞容量衰减的不同阶段.
- 接口极化主导了早期的色,后来转变为大量降解引起的活性物质损失.
- 了解这种过渡对于改善LLO稳定性和电池寿命至关重要.
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