对于离子电池的高压分层氧化物阴极的挑战和修改策略
Yuesen Li1,2, Tong Zhang2, Zihao Song2
1College of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, Hebei, China.
ChemSusChem
|September 24, 2024
概括
在离子电池 (SIB) 中的高压运行会增加能量密度,但会导致阴极降解. 诸如兴奋剂和表面涂层等策略可以增强分层氧化物阴极 (LOC) 的稳定性,从而提高SIB性能.
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:
- 离子电池 (SIB) 提供了丰富的资源,低成本和增强的安全性.
- 层状氧化物阴极 (LOC) 是由于其高容量和易于合成,对SIB有希望.
- 增加工作电压是SIB中更高能量密度的关键.
研究的目的:
- 审查在高工作电压下影响 LOC 的挑战和机制.
- 总结改善 LOC 的散装和表面稳定性的策略.
- 为开发高能量密度SIB提供见解.
主要方法:
- 对有关高压SIB阴极材料的现有文献的审查.
- 分析相位转换,体积变化和表面降解机制.
- 稳定策略的分类,包括兴奋剂,结构设计和表面修改.
主要成果:
- 高压运行会在LOC中诱导散装相变,体积变化和网格应力.
- 表面退化涉及阴极电解质间相 (CEI) 增长和气体释放 (O2,CO2).
- 诸如批量兴奋剂,结构设计,表面涂料和梯度兴奋剂等策略可以缓解这些问题.
结论:
- 解决散装和表面退化对于SIB中的高压LOC至关重要.
- 有效的策略可以显著提高SIB的电化学性能和稳定性.
- 对稳定技术的进一步研究将推动下一代高能量密度SIB的开发.
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