在一个富含Ni的阴极中,对辐射有序结构的初级粒子排列中的晶体平面角度进行操纵
Ting Chen1, Chuyao Wen2, Chen Wu3
1Institute for Advanced Study, Chengdu University Chengdu 610106 PR China xiaodong2009@scu.edu.cn.
Chemical science
|December 11, 2023
概括
富含Ni的阴极中的 (W) 兴奋剂促进了辐射微观结构,并增强了结构稳定性. 这种兴奋剂促进了离子迁移,减少了降解,提高了电池性能.
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
- 固态化学 固态化学
背景情况:
- 富含的阴极对于高性能电池至关重要,但它们的结构稳定性是一个挑战.
- 富含Ni的阴极中的辐射微结构提高了结构完整性.
- 辐射结构的形成机制和兴奋剂的作用需要进一步阐明.
研究的目的:
- 系统地研究由Ni丰富阴极中的不同合元素诱导的辐射结构的形成过程.
- 了解兴奋剂如何影响晶体平面的方向和微观结构.
- 为了将兴奋剂诱导的结构变化与电化学性能相关联.
主要方法:
- 电子反向散射衍射 (EBSD) 用于分析晶体平面排列.
- 高角度环状暗场扫描传输电子显微镜 (HAADF-STEM) 用于微观结构分析.
- 在4.6V的切断电压下进行电化学循环测试.
主要成果:
- (W) 兴奋剂在烧结过程中促进了晶体平面的低角度排列和双生长,与 (B) 兴奋剂不同.
- 由W-doping诱导的双胞胎生长增强了Li+迁移,并减少了 (003) 平面表面能量.
- 在1C的200个循环后,W-doped阴极保持了94.1%的容量,显示出更好的结构稳定性.
结论:
- 兴奋剂元素的选择显著影响了Ni丰富的阴极中辐射微观结构的形成和晶体平面的方向.
- 化增强了结构稳定性,通过促进有利的晶体平面方向和促进Li +运输.
- 控制晶体平面的方向对于减轻结构降解和改善丰富阴极的循环寿命至关重要.
相关概念视频
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