阴极
材料科学
透射电子显微镜
结构稳定性
离子
开裂
化学工程
化学物理
结晶学
纳米技术
化学
复合材料
物理化学
结构工程
工程类
有机化学
作者
Gi-Mun Han,Ye-Sung Kim,Hoon‐Hee Ryu,Yang‐Kook Sun,Chong Seung Yoon
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2022-08-10
卷期号:7 (9): 2919-2926
被引量:30
标识
DOI:10.1021/acsenergylett.2c01521
摘要
Single-crystalline (SC) Li[Ni1–x–yCoxMny]O2 (NCM) cathodes are an effective solution for countering the interparticle cracking of Ni-rich NCM cathodes with Ni < 80%. Transmission electron microscopy analysis indicates that no irreversible structural damage is observed when the SC-Li[Ni0.7Co0.15Mn0.15]O2 NCM cathode is charged to 4.3 V. However, in the charged SC-Li[Ni0.9Co0.05Mn0.05]O2 cathode the internal strain generated by the H2 → H3 transition is aggravated by the slow migration rate of Li ions, which produced nonuniform Li distributions and structural inhomogeneities. The charged SC-Li[Ni0.9Co0.05Mn0.05]O2 cathode experiences intraparticle cracking at a microscopic scale, and submicroscopic cracks appear at the boundaries among multiple phases present in the charged state even after the first charge. We suggest that a slow rate of Li extraction or particle size reduction would ameliorate the structural defects at the end of charging and improve the cycling stability for Ni-rich SC-layered cathodes Ni > 90%.
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