Preparation method of carbon composite metal lithium oxide anode material

Abstract

The invention discloses a preparation method of a carbon composite metal lithium oxide anode material. The method comprises the following steps: (1) weighing a metallic oxide and a lithium salt according to a molar ratio, mixing the metallic oxide and the lithium salt, and performing heating and sintering to obtain a metal lithium oxide anode material powder; (2) weighing a carbon source whose weight is 0.01-10% that of the powder, dispersing the carbon source into an oxidizing agent, and performing oxidization, filtration and washing to obtain a surface functionalized carbon source precursor suspension liquid; (3) adding the metal lithium oxide anode material powder into the functionalized carbon source precursor suspension liquid while stirring, stirring evenly for reaction for 5 hours, and obtaining a carbon composite metal lithium oxide precursor powder; (4) thermally treating the precursor powder under an inert gas to obtain the carbon composite metal lithium oxide anode material. The carbon composite metal lithium oxide anode material has a relatively high specific charge-discharge capacity, and the first specific discharge capacity is up to 190mAh / g; the internal resistance is reduced, so that the cycle performance and the rate capability are better.

Description

technical field [0001] The invention relates to a method for preparing a carbon composite metal lithium oxide positive electrode material, and belongs to the technical field of lithium ion battery material preparation. Background technique [0002] With the promotion of lithium-ion batteries to the power battery market, higher and higher requirements are put forward for the energy density and power density of lithium-ion batteries. The conductivity of metal lithium oxide positive electrode materials is much lower than that of graphite negative electrode materials. Improving the conductivity of metal lithium oxide positive electrode materials has a direct impact on improving the power characteristics of lithium-ion batteries. [0003] At present, there are two main ways to improve the conductivity of metal lithium oxide cathode materials: one is to reduce the particle size of metal lithium oxide cathode materials or obtain secondary particles from nanoscale cathode materials ...

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Problems solved by technology

However, the above-mentioned traditional method of adding carbon source precursor is not suitable for positive electrode materials with oxidative high-valent metal lithium oxides, such as lithium cobaltate, lithium manganate, ternary, nickel-cobaltate lithium, etc., because these high-valent metal oxides must be in Sintering under air or oxygen conditions, while carbon sources such as glucose, its precursors must be carbonized under an inert atmosphere or a reducing atmosphere

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