Preparation of Three Dimensionally Ordered Macroporous LiCoO{sub}2 Cathode for Lithium Batteries

摘要

Macroporous LiCoO{sub}2 was prepared by a colloidal crystal templating method. Colloidal crystal consisting of monodisperse polystyrene particles was used as the template for the synthesis of macroporous LiCoO{sub}2. A Li-Co-O sol was injected into the template, and it was calcined at high temperatures. A porous membrane of LiCoO{sub}2 with three dimensionally ordered macroporous (3DOM) structure was obtained. The prepared material had a rock-salt type crystallographic structure with R3m space group. The interconnected macropores with relative uniform size (0.8～0.9μm) were observed on entire part of the membrane. The electrochemical properties of the 3DOM LiCoO{sub}2 were characterized with galvanostatic charge-discharge measurements in an organic electrolyte containing a lithium salt. The 3DOM LiCoO{sub}2 exhibited charge and discharge capacities of 136 and 107 mA h g{sup}(-1), respectively, at around 3.9 V vs. Li/Li{sup}+, indicating that 3DOM LiCoO{sub}2 electrode had solid state redox reaction accompanying with Li{sup}+ ion insertion and extraction to CoO{sub}2 frameworks.