材料科学
煅烧
微观结构
微晶
锂(药物)
阴极
化学工程
粒子(生态学)
冶金
物理化学
医学
生物化学
化学
工程类
内分泌学
催化作用
海洋学
地质学
作者
Kyoung Eun Lee,Yura Kim,Ju Seong Kim,Kyoung Sun Kim,Ki Joo Hong,Sang Cheol Nam,Hyungsub Kim,Dong‐Wook Lee,Kyu‐Young Park
标识
DOI:10.1021/acsami.4c00514
摘要
High-Ni layered oxide cathodes are promising candidates for lithium-ion batteries due to their high energy density. However, their cycle stability is compromised by the poor mechanical durability of the particle microstructure. In this study, we investigate the impact of the calcination temperature on microstructural changes, including primary particle growth and pore evolution, using LiNi0.88Mn0.08Co0.04O2 (N884), with an emphasis on the critical calcination temperature for polycrystalline and single-crystal designs in high-Ni cathodes. As the calcination temperature increases, the primary particles undergo a rectangular growth pattern while the pore population decreases. Beyond a certain critical temperature (in this case, 850 °C), a sudden increase in primary particle size and a simultaneous rapid reduction in the pore population are observed. This sudden microstructure evolution leads to poor cycle retention in N884. In contrast, single-crystal particles, free of grain boundaries, synthesized at this critical temperature exhibit superior cycle retention, underscoring the significance of microstructural design over crystalline quality for achieving long-term cyclability. Our study sheds light on the interplay between calcination temperature and microstructural evolution, proposing the critical temperature as a key criterion for single-crystal synthesis.
科研通智能强力驱动
Strongly Powered by AbleSci AI