A method for preparing lithium-rich manganese-based positive electrode materials by co-precipitation-hydrothermal combination

Abstract

The invention discloses a method for preparing a lithium-rich manganese-based positive electrode material by co-precipitation-hydrothermal combination. First use nickel sulfate, cobalt sulfate, manganese sulfate as nickel source, cobalt source and manganese source, dissolve it in deionized water to form a uniform light orange transparent solution, then add a certain amount of complexing agent ammonia water and The precipitating agent sodium hydroxide is prepared by combining coprecipitation and hydrothermal to obtain Mn 0.54 co 0.13 Ni 0.13 (OH) 2 Precursor. The cathode material can be obtained by sintering lithium carbonate as a lithium source and cooling it naturally. The process is simple, the source of raw materials is wide, and it is beneficial to large-scale industrial production, and the present invention combines the co-precipitation method with the hydrothermal method to obtain a lithium-rich manganese-based positive electrode material. The electrochemical performance of the material is comparable to that prepared by the traditional co-precipitation method The electrochemical performance of the material has been significantly improved, and the capacity remains at 201.2mAh·g after 50 cycles at a rate of 0.2C. ‑1 .

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a lithium-rich manganese-based positive electrode material Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 preparation method. Background technique [0002] Electric vehicles are a new strategic product to solve energy and environmental problems, but at present, electric vehicles still face problems such as short cruising range, high cost and lack of safety, which seriously restrict the large-scale promotion and application of electric vehicles. Therefore, the research and development of a new generation of 300~400Wh / kg power lithium batteries is an inevitable trend in the development of lithium battery materials and technologies in the future. From the current technology point of view, increasing the energy density of the battery by reducing the mass ratio of the inactive substances in the battery has almost reached the limit of the technol...

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Problems solved by technology

[0004] At present, the main methods for synthesizing lithium-ion ternary cathode materials include co-precipitation method, hydrothermal method, sol-gel method, high-temperature solid-phase method, etc. The chemical process of sol-gel method is first to disperse the raw materials in a solvent, and then Active monomers are generated through hydrolysis, and the active monomers are polymerized to become sols, and then generate gels with a certain spatial structure. After drying and heat treatment, nanoparticles and required materials are prepared. However, the ternary materials prepared by this method Electrochemical properties of cathode materials are unsatisfactory

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