期刊
CHEMSUSCHEM
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202300417
关键词
Nickel-rich cathodes; cation mixing; structural evolution; electrochemical performance; lithium-ion batteries
Single-crystal nickel-rich materials show excellent structure stability and cycle performance, but high cation mixing in the cathode material negatively affects its electrochemical performance. By regulating the cation mixing, the single-crystal LiNi0.83Co0.12Mn0.05O2 cathode material exhibits high discharge capacity, excellent capacity retention, and superior rate capability. The improved performance is attributed to the reduced cation mixing and integrated single grains, allowing for rapid Li+ transportation within the crystal structure.
Single-crystal nickel-rich materials are promising alternatives to polycrystalline cathodes owing to their excellent structure stability and cycle performance while the cathode material usually appears high cation mixing, which may have a negative effect on its electrochemical performance. The study presents the structural evolution of single-crystal LiNi0.83Co0.12Mn0.05O2 in the temperature-composition space using temperature-resolved in situ XRD and the cation mixing is tuned to improve electrochemical performances. The as-synthesized single-crystal sample shows high initial discharge specific capacity (195.5 mAh g(-1) at 1 C), and excellent capacity retention (80.1 % after 400 cycles at 1 C), taking account of lower structure disorder (Ni2+ occupying Li sites is 1.56 %) and integrated grains with an average of 2-3 & mu;m. In addition, the single-crystal material also displays a superior rate capability of 159.1 mAh g(-1) at the rate of 5 C. This excellent performance is attributed to the rapid Li+ transportation within the crystal structure with fewer Ni2+ cations in Li layer as well as intactly single grains. In sum, the regulation of Li+/Ni2+ mixing provides a feasible strategy for boosting single-crystal nickel-rich cathode material.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据