提高NMC811电池阴极的功率密度和周期寿命,通过结合密集日历和激光图案
Kumar Raju1,2, Stephen W T Price2,3,4, Alice J Merryweather2,5,6,7
1Department of Engineering, University of Cambridge 17 Charles Babbage Road Cambridge CB3 0FS UK kr516@cam.ac.uk mfld2@cam.ac.uk.
概括
采用激光诱导孔的单晶NMC811电极,可以提高电动汽车电池的充电速度和寿命. 这种方法平衡了孔径和能量密度,克服了离子电池技术的关键局限性.
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:
- 充电时间是电动汽车 (EV) 采用的主要障碍.
- 电极图案增强了离子运输,但由于孔隙性增加,往往会降低能量密度.
- 单晶NMC811 (SC-NMC811) 电极提供更高的日历密度,可能抵消图案诱导的多孔性.
研究的目的:
- 研究SC-NMC811电极的激光模式,以提高速率性能和能量密度.
- 为了探索电极孔隙,图案和体积能量密度之间的权衡.
- 了解在图案电极中提高容量保留背后的机制.
主要方法:
- 日历SC-NMC811电极到25%的多孔性.
- 引入激光诱导的孔格式 (100-600微米间距),以保持孔隙率低于30%.
- 使用操作式电荷光度,电子能量损失光谱 (EELS) 映射,X射线衍射 (XRD) 映射和XRD计算机断层扫描 (XRD-CT).
主要成果:
- 系统地改善速度性能,增加孔密度.
- 在有图案的电极中减少了阴极网格氧气损失.
- 过渡金属穿和阳极固体电解质相间 (SEI) 阻抗增长的减少.
- 提高容量保留和电极寿命.
结论:
- SC-NMC811电极可以进行过度和激光图案,同时保持低平均孔径 (<30%).
- 电极图案增强了速度性能和寿命.
- 减少氧气损失和改善稳定性有助于观察到的性能增长.
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