单斜晶系
六方晶系
材料科学
相(物质)
阴极
相变
电化学
结晶学
化学工程
粒子(生态学)
六角相
分析化学(期刊)
化学
热力学
电极
晶体结构
物理化学
物理
色谱法
有机化学
工程类
地质学
海洋学
作者
Jaephil Cho,Yong Jeong Kim,Byungwoo Park
摘要
Structural instability of can be improved by sol-gel coating of and subsequent heat-treatments. While phase does not exist after heat-treatments, solid solution that has discretely higher Al concentration was formed at the surface up to ∼500 Å inside the particle. However, heat-treatment to 700°C results in the presence of the solid solution beyond ∼500 Å. The different Al concentration at the surface significantly affects the structural stability of the materials during cycling, and those prepared at 400°C do not show a phase transition from hexagonal to monoclinic phase. Disappearance of such a phase transition improves capacity retention of the cathode. Moreover, cathodes prepared at 400 and 500°C show improved layered characteristics with cation order. © 2001 The Electrochemical Society. All rights reserved.
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