| As a high-capacity negative electrode material,transition metal oxides are widely used in energy storage,supercapacitors and lithium batteries.The capacity of transition metal oxides can reach hundreds or even thousands mAh.While the capacity of graphite is relatively small.Therefore,science researchers have great interest in this new type of negative electrode materials,and the synthesis and development of this material have received extensive attentions.However,its instability limits its application in real life.In this paper,we use the cobalt molybdenum oxide as the research object to improve the specific capacity,stability and rate performance of lithium-ion batteries and synthesis a high-performance cobalt molybdate cathode material.In this thesis,we tried to use glycerol,acetylacetonate and molybdenum acetylacetonate to synthesize multimetallic oxide with complex structure by hydrothermal method.The growth mechanism was preliminarily proposed.The results are as follows:1.By using glycerol as template and adjusting the ratio of cobalt acetylacetonate and acetylacetone molybdenum,we have got a new type of complex and irregular structure material,a microphone-like structure of CoMo-glycerate,then after calcining we got the final product-a kind of core-shell structure.2.The mechanism of growth was preliminarily proposed through experiments.The effects of different ratios,concentrations,solvents and pH on the morphology were investigated.The results showed that the change of concentrations would lead to the change of size.While huge impact would be produced with altering the ratio,solvent,pH,etc,and even change the morphologies of the product.3.In order to find the best material,we have tried plenty of efforts such as sulfuration,wrapping the surface with carbon and so on.4.The performance in lithium-ion battery.The material has excellent lithium ion performance,in which the specific capacity of cobalt molybdenum oxide reaches about 1500 mAh/g. |
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