Cathode material, alpha-Fe2O3, of high-capacity lithium ion battery and preparation method for material

Abstract

The invention relates to a cathode material, alpha-Fe2O3, of a high-capacity lithium ion battery and a preparation method for the cathode material. According to the preparation method, soluble trivalent molysite and an alkali metal hydroxide easy to dissolve are adopted as raw materials, and the hematite alpha-Fe2O3 is prepared by a hydrothermal method. The preparation method comprises the following specific steps that: 1) aqueous solution of the trivalent molysite with molarity being 0.5mol / L-2mol / L and aqueous solution of the alkali metal hydroxide easy to dissolve with molarity being 2mol / L-6mol / L are prepared; 2) the aqueous solution of the trivalent molysite and the aqueous solution of the alkali metal hydroxide obtained in the step 1) are mixed to generate suspension, the suspension is stirred for certain time, and then ammonia water drops into the suspension, so that the pH value of the suspension is adjusted to be 9-13; and 3) the suspension obtained in the step 2) is poured into a hydrothermal reaction kettle which can be airtight, the hydrothermal reaction kettle is put into an oven to be heated at a temperature of 160 DEG C-200 DEG C and then is subjected to thermal insulation for 3 hours to 20 hours, and after the reaction is finished, a product is subjected to solid-liquid separation, washing and drying so as to obtain the alpha-Fe2O3. When serving as the cathode material of the lithium ion battery, the alpha-Fe2O3 prepared by the method has higher specific capacity and better cycling stability. According to the method, the operation is simple, the cost is low, additives are not required, and the product quality is stable.

Description

technical field [0001] The present invention belongs to electrochemical field here, be specifically related to a kind of high-capacity lithium-ion battery anode material α-Fe 2 o 3 and its preparation method. Background technique [0002] Due to its excellent characteristics, lithium-ion batteries have become the current battery system with better comprehensive performance. The further expansion of lithium-ion batteries puts forward higher requirements on the capacity and fast charge and discharge capabilities of lithium-ion batteries. Anode materials are one of the key factors determining the overall performance of lithium-ion batteries. At present, the anode materials of commercial lithium-ion batteries are still graphite-based anodes, but they have low specific capacity, poor rate discharge performance, and easy deposition of metal lithium during charging and discharging, which will cause certain safety hazards. Therefore, actively exploring a new type of lithium-ion ...

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Problems solved by technology

However, most of the reported articles control the particle morphology and size distribution of the product by adding surfactants, and there is no reference to the preparation of α-Fe2O2O3 patent, so the present invention has prepared submicron and well-dispersed spherical α-Fe2O3 without adding any surfactant , and used it as an anode material for lithium-ion batteries, and found that it exhibited a high electrochemical specific capacity, and has the potential to be used as an anode material for lithium-ion batteries for large-capacity energy storage

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