微晶
锂(药物)
单晶
材料科学
杂质
兴奋剂
扫描电子显微镜
Crystal(编程语言)
离子
电极
化学工程
分析化学(期刊)
结晶学
化学
复合材料
冶金
物理化学
光电子学
有机化学
工程类
内分泌学
医学
程序设计语言
计算机科学
作者
Aaron Liu,Ning Zhang,Jamie E. Stark,Phillip Arab,Hongyang Li,J. R. Dahn
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-04-01
卷期号:168 (4): 040531-040531
被引量:33
标识
DOI:10.1149/1945-7111/abf7e8
摘要
Increasing the Ni content of a Ni-rich layered positive electrode material is one common way to improve energy density of Li-ion cells but normally leads to shorter cell lifetimes. Single crystalline materials have been shown to improve the cell lifetime by reducing the degree of material degradation. This first study in a two part series investigates the synthesis of Co-free single crystalline LiNi 0.95 Al 0.05 O 2 and LiNi 0.975 Mg 0.025 O 2 via a two-step lithiation method. This method consists of a first step heating of the precursors at high temperatures but with deficient Li to grow crystalline particles and then a second step at lower temperature to fully lithiate the material. The synthesized materials were characterized by scanning electron microscopy and X-ray diffraction to understand the impact of synthesis conditions. Single crystal materials were successfully synthesized, and Mg-containing single crystal materials achieved micron-sized particles with as low as 2% Ni in the Li layer. Al-containing single crystal materials could not avoid the formation of Li 5 AlO 4 impurity for all conditions tested. The presence of Li or Mg and high temperatures were identified as factors that promote crystallite growth. Selected samples were characterized electrochemically and compared to their polycrystalline counterparts. Mg-containing single crystal materials are not yet competitive with their polycrystalline counterparts yet, and further understanding and development is needed.
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