具有超低应变的分层阴极增强了离子电池的快速充电和缓慢放电能力
Maolin Yang1, Ziwei Chen1, Zhongyuan Huang1
1School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen, 518055, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|June 28, 2024
概括
兴奋剂增强了电动汽车的离子电池 (SIB). 这种修改通过优化阴极性能和减少材料应变来改善快速充电和缓慢放电的能力.
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:
- 电动汽车行业需要先进的二次电池,具有快速充电和缓慢放电的能力.
- 在离子电池 (SIB) 中,分层氧化物阴极提供了竞争力的电化学性能,但需要提高速度能力和减少晶格应变,以满足苛刻的应用.
研究的目的:
- 为了提高离子电池的分层氧化物阴极的速率性能和结构稳定性.
- 研究 (K) 兴奋剂对电化学循环期间离子扩散通路和晶格应变的影响.
主要方法:
- 在分层氧化物阴极中层的有针对性的K-doping.
- 优化过渡金属层分布和离子扩散路径.
- 在各种C率 (例如0.1C,10C,20C) 上进行电化学性能测试,以评估容量保留和速率能力.
- 在不对称的充/放电过程中使用体积应变测量分析格子应变.
主要成果:
- 基因兴奋剂成功下令过渡金属层和优化离子扩散通路,减少扩散屏障.
- 修改后的阴极表现出了显著的速率性能,在20°C时保持了94%的容量,而在0.1°C时保持了94%的容量.
- 由于循环时层的"子效应",观察到总体体积应变的显著减少 (0.03%).
结论:
- 层的有针对性的K-doping是一种有效的策略,可以提高SIBs的分层氧化物阴极的电化学性能.
- 优化的扩散通路和最小化的格子应变有助于优越的速率能力和结构稳定性.
- 这种方法为开发适用于电动汽车快速充电和缓慢放电应用的高性能SIB提供了有希望的途径.
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