在P2-Mn-Fe-Cu基氧化物阴极的储存上,Co/Ca编码诱导层间结构规则的影响
Tianhao Luo1, Xiaokai Ding1, Huabin Sun2
1Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, Hubei, P. R. China.
通过稳定结构和提高性能,Co/Ca代增强了P2型离子电池阴极. 这种新的正极材料显示出先进的离子电池的优良容量,速率能力和循环稳定性.
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:
- 基于P2型Mn-Fe-Cu的材料对离子电池 (SIB) 是有前途的.
- 挑战包括相位过渡,氧气释放,容量退化和循环稳定性差.
- 这些问题阻碍了这些正极材料的实际应用.
研究的目的:
- 为SIBs开发一种新的P2型阴极材料,提高其稳定性和性能.
- 为了研究用 (Co) 和 (Ca) 离子进行合的效果.
- 为了减轻有害的相位过渡和氧气释放在Mn-Fe-Cu基阴极.
主要方法:
- 通过共合成一种新的P2-Na0.65Ca0.05Mn0.55Co0.05Fe0.2Cu0.2O2阴极材料.
- 将Co3+纳入Mn位点以减轻Jahn-Teller扭曲并激活阳离子氧化还原.
- 将Ca2+替换成Na位点,以增强Na+路径的稳定性并抑制层滑动.
主要成果:
- 编材料表现出增强的Na+扩散动力学,提高导电性和减少电解质腐蚀.
- 显示出高初始放电容量 (125.9 mAh g-1 在0.2 C) 和优异的速率性能 (79.6 mAh g-1 在10 C).
- 在10°C的1000个循环后,实现了出色的长周期稳定性,73.2%的容量保留.
结论:
- 在P2型阴极中,Co/Ca编码有效地抑制相位过渡和氧气损失.
- 和的协同作用提高了电化学性能和结构稳定性.
- 这种共策略为开发高性能SIB阴极材料提供了一个有前途的途径.
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