订购格子主机框架诱导了客人Li+ 干扰在高性能无的Ni-丰富的阴极材料中
Jia Xu1, Xiaoyu Zhang1, Shixiong Sun1
1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
Journal of colloid and interface science
|May 15, 2024
概括
使用 (NiMg) 的没有的富含Ni的阴极显示了离子电池 (LIB) 的有前途的循环稳定性. 这项研究澄清了结构设计原则,以开发稳定,低成本的替代品,以基材料.
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:
- 的成本上升和供应问题迫使离子电池 (LIB) 需要无替代品.
- 开发富含Ni的阴极需要了解结构设计原则,以选择合适的替代元件.
研究的目的:
- 设计和评估没有的富含Ni的阴极,特别是LiNi0.95Mg0.05O2 (NiMg) 和LiNi0.95Mn0.05O2 (NiMn),作为LiNi0.96Co0.04O2 (NiCo) 的替代品.
- 阐明管理这些无正极性能的结构原理.
主要方法:
- 对NiMg,NiMn和NiCo阴极材料的合成和电化学测试.
- 应用逆蒙特卡洛 (RMC) 建模和对分布函数 (PDF) 分析来研究局部原子结构.
主要成果:
- NiMg的周期稳定性与NiCo相似,而NiMn的性能较差.
- 与Co和Mg相比,RMC建模显示Mn会诱导更严重的Jahn-Teller扭曲和晶格障碍.
- 在NiMg和NiCo有序的格子框架通过减轻应力和粒子裂变,有助于增强循环稳定性.
- 顺序框架还促进了Li+扩散,提高了速度能力.
结论:
- 在富含Ni的阴极中,是一种可行的替代品,具有可比的稳定性.
- 了解局部结构扭曲和格子排序对于设计高性能,无的丰富阴极至关重要.
- 这项工作为下一代无LIB阴极的结构设计提供了洞察力.
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