材料科学
阴极
涂层
烧结
相(物质)
化学工程
图层(电子)
表面改性
纳米技术
复合材料
物理化学
工程类
有机化学
化学
作者
Hengyu Ren,Wenguang Zhao,Haocong Yi,Zhefeng Chen,Haocheng Ji,Jun Qi,Wangyang Ding,Zijian Li,Ming‐Ying Shang,Jianjun Fang,Ke Li,Dongke Zhang,Shunning Li,Qinghe Zhao,Feng Pan
标识
DOI:10.1002/adfm.202302622
摘要
Abstract The structure instability issues of the highly delithiated LiCoO 2 have significantly hindered its high‐voltage applications (≥4.55 V vs Li/Li + ). Herein, for the first time, multiple modifications of Li 0.9 Mg 0.05 CoO 2 (L 0.9 M 0.05 CO) via a simple one‐step sintering synthesis are reported. A combination of the bulk Li/Co antisites, a Mg‐pillar enriched surface, and a thin MgO coating layer is achieved to maintain both the bulk and surface structural stability of L 0.9 M 0.05 CO upon cycling at an upper cut‐off voltage of 4.6 V. The bulk Li/Co antisites are discovered to enhance the H1‐3 phase evolution reversibility, the Mg pillars that substitute the Li sites effectively reinforces the surface structure, and the thin MgO coating layer can effectively prevent the cathode from severe side reactions. Benefiting from the reduced but reversible H1‐3 phase transition and the reinforced surface structure, L 0.9 M 0.05 CO shows an excellent cycle stability. This work provides a new structure modulation route for developing high‐voltage LiCoO 2 cathodes.
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