Preparation and electrochemical properties of Li2MoO3/C composites for rechargeable Li-ion batteries
文献情報
Yotaro Shirao, Kei Kubota, Shinichi Komaba
Layered Li2MoO3 is a potential candidate for a high-capacity positive electrode material for Li-ion batteries because of its excess lithium composition. However, the difficulty of single-phase preparation and its insulating nature are drawbacks for its application in lithium-ion batteries. A small quantity of acetylene black added in the starting material solves these drawbacks, i.e. the formation of impurity phases and the low conductivity. As a result, a Li2MoO3/C composite is successfully synthesized with the simple addition of acetylene black. Since the electronic conductivity of the composite is enhanced to more than 1000 times higher than that of bare Li2MoO3, the Li2MoO3/C composite delivers approximately 230 mA h gā1 of initial discharge capacity in a voltage range of 1.5ā4.3 V, while carbon-free Li2MoO3 shows only 110 mA h gā1 of initial discharge capacity. During the initial lithium extraction and insertion, a partial transformation from a layered into a cation-disordered cubic structure is evidenced in the Li2MoO3/C composite electrode by X-ray diffraction.
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