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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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Published on: November 11, 2013

在单晶丰富阴极中可逆平面滑动和微裂纹

Yujing Bi¹, Jinhui Tao¹, Yuqin Wu^2,3

¹Pacific Northwest National Laboratory, Richland, WA 99352, USA.

Science (New York, N.Y.)

|December 11, 2020

概括

离子电池的单晶丰富阴极由于度梯度而呈现可逆微裂变. 这一发现为减轻粒子裂变提供了洞察力,

科学领域:

材料科学
电化学
电池技术

背景情况:

高能 (Ni) 丰富的阴极对于先进的 (Li) 离子电池至关重要.
这些阴极面临诸如湿度敏感性,副作用和气体生成等挑战.
单晶丰富的阴极通过最小化相位边界和材料表面提供了潜在的解决方案.

研究的目的:

研究单晶Ni丰富阴极中的超电位,微观结构和电化学行为之间的基本联系.
了解这些先进电池材料中粒子裂变背后的机制.
确定减轻合成相关缺陷的策略.

主要方法:

高性能单晶丰富阴极的合成.
微观分析以观察微观结构变化.
电化学测试以与结构完整性相关联.

主要成果:

在单晶丰富阴极中沿 (003) 平面观察到可逆平面滑动和微裂纹.
与离子度梯度引起的局部应力相关联微观结构缺陷的形成.
证明了网格缺陷与电化学性能之间的联系.

结论:

微结构缺陷的可逆形成是单晶丰富阴极性能的一个关键因素.
了解离子度梯度和诱导应力对于防止粒子裂变至关重要.
这项研究为设计下一代离子电池更强大,更高性能的单晶Ni丰富阴极提供了基础知识.

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