通过轻松的表面缺陷工程,在Co-free Li-丰富的层状氧化物中实现超低压色
Zefan Zheng1, Xiangxiang Wang2, Kun Wang2
1College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China; Institute of Zhejiang University-Quzhou, Zheda Road 99, Quzhou 324000, China.
Journal of colloid and interface science
|August 31, 2024
概括
没有的富层氧化物 (LLOs) 对离子电池具有前景. 一种新的表面重建方法提高了稳定性和性能,克服了商业用途的关键挑战.
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
- 电池技术 电池技术
背景情况:
- 无的丰富层氧化物 (LLOs) 是由于其高能量密度,为离子电池提供有前途的阴极材料.
- 表面氧气损失和电压/容量衰减阻碍了LLO的性能.
研究的目的:
- 开发一种简单,环保的方法来进行Li$_{1.2}$Mn$_{0.6}$Ni$_{0.2}$O$_{2}$的表面重建.
- 提高LLOs的结构稳定性和电化学性能.
主要方法:
- 水热合成用于表面重建.
- 螺旋相的特征,氧气空缺和缩.
- 电化学测试 (循环,速度能力,库伦比效率).
- 实验验证和理论研究.
主要成果:
- 表面重建诱导了旋转阶段,氧气空缺,减少了.
- 缓解了不可逆转的氧氧还原和增强了离子扩散.
- 实现了低张力,低扭曲性质和改善的结构稳定性.
- 经过150个周期在1°C以超低电压衰变 (0.91 mV周期-1) 后,证明了97.12%的容量保留.
- 提高了初始库伦比克效率和速度性能.
结论:
- 表面缺陷工程方法有效地提高了LLO的电化学性能.
- 开发的"低应变"LLOs表现出优越的结构和电化学稳定性.
- 这种方法为商业化先进的LLO阴极材料提供了途径.
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