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通过对可溶性控制分离来定制间颗粒接口,以优化LiNiO2阴极.

Baoyu Han1, Xinhai Li1, Zhiliang Yan1,2

  • 1National Energy Metal Resources and New Materials Key Laboratory, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, School of Metallurgy and Environment, Central South University, Changsha, 410083, P. R. China.

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概括

在富含的分层阴极 (LiNi0.996Zr0.004O2) 中使用兴奋剂的接口工程提高了高能量密度离子电池的稳定性和性能.

关键词:
+的扩散动力学高分层阴极高分层的阴极.调节晶体间接口的调节抑制微裂纹抑制的方法工程的先驱工程的前身.

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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:

  • 富含的分层阴极面临结构不稳定性和界面降解,限制离子电池的能量密度.
  • 开发稳定,高性能阴极材料对于先进的能量存储至关重要.

研究的目的:

  • 通过在现场用进行兴奋剂来设计富含的层状阴极的晶体间接口.
  • 改进基于LiNiO2的阴极的结构完整性,电化学性能和循环寿命.

主要方法:

  • 在LiNi0.996Zr0.004O2 (LNO-Zr) 前体与Zr4+进行现场注,以引导晶体生长.
  • 工程天极材料的千克尺度合成和表征.
  • 对界面特性,Li+通路和电化学性能进行分析.

主要成果:

  • 紫外线兴奋剂促进了偏好的面体生长,并形成了超细初级粒子.
  • 在粒际接口处的一种合规的Li2ZrO3纳米层抑制了谷物生长,并保留了结构.
  • LNO-Zr阴极实现了239.1 mAh g-1容量,在200个周期后保持78.3%,并改善了动力学.

结论:

  • 通过Zr兴奋剂进行可扩展的晶体间接口工程,增强了富含Ni的阴极的结构稳定性和电化学性能.
  • 工程架构减轻了格子应变,微裂纹和寄生反应.
  • 这一策略为下一代离子电池的缺陷化学和机械稳定提供了洞察力.