Method of synthesizing lithium manganate material for lithium ion battery

Abstract

A method of synthesizing lithium manganate material for a lithium ion battery comprises the steps of a), collecting waste butts, washing, and drying; b), mixing a soluble manganese salt and a soluble lithium salt at a molar ratio of 2:1, and carrying ultrasonic treatment to obtain a mixed liquid; c), soaking the treated butts in the obtained mixed liquid that submerge the butts, and removing and drying after soaking; d), burning the butts treated in step c to obtain the lithium manganate material. The lithium manganate material produced herein is of hollow tube structure and has loose tube wall structure so that volume expansion in the charging-discharging process can be relieved and cycle performance of the lithium ion battery can be improved; the lithium manganate material produced herein is doped with trace titanium, has more stable crystal structure, enables less manganese to be dissolved in use, and enables improved capacity attenuation for the lithium ion battery in the charging-discharging cycle process.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery electrode materials, in particular to a method for synthesizing lithium manganate materials for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, small self-discharge rate, and environmental protection, and are widely used in portable electronic devices and electric vehicles; The advantages of high energy density, abundant reserves, and high safety have become the hotspots of current research, and they are also future alternatives to LiCoO. 2 , LiNiO 2 However, in the process of actual use, due to the system expansion, the dissolution of manganese and the ginger Taylor effect, the cycle life of lithium manganate is relatively short, especially the cycle life under high temperature conditions. , which limits its practical application. [0003] Chinese Patent Publ...

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Problems solved by technology

[0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, small self-discharge rate, and environmental protection, and are widely used in portable electronic devices and electric vehicles; The advantages of high energy density, abundant reserves, and high safety have become the hotspots of current research, and they are also future alternatives to LiCoO. 2 , LiNiO 2 However, in the process of actual use, due to the system expansion, the dissolution of manganese and the ginger Taylor effect, the cycle life of lithium manganate is relatively short, especially the cycle life under high temperature conditions. , which limits its practical application

[0003] Chinese Patent Publication No. CN103904321A, the patent publication date is July 2, 2014, discloses a high-temperature solid-phase preparation method of lithium manganate, a negative electrode material for lithium ion batteries. The lithium manganate material is a carbon-coated lithium manganate material , although the lithium manganate material can be improved to a certain extent, the performance of the lithium manganese oxide material is reduced due to system expansion, manganese dissolution, etc., but because its outer side is covered with carbon, it cannot be sintered in an air atmosphere during the sintering process, or in other words The carbon-coated lithium manganate material prepared by sintering in an air atmosphere has poor performance. The carbon-coated lithium manganate material of this invention must be sintered in an inert gas atmosphere or a reducing atmosphere, which reduces the production cost of the lithium manganate material. Efficiency, while also increasing the cost of lithium manganate material preparation

[0004] Another example is Chinese Patent Publication No. CN101381108A, the patent publication date being March 11, 2009, disclosing a method for synthesizing spherical lithium manganate, using manganese dioxide, lithium carbonate, acetone, sodium carboxymethyl cellulose , ethanol mixed into a colloidal mixture and then calcined after drying. Although this method can produce spherical lithium manganate materials with regular shapes, a large amount of organic compounds are added to the colloidal mixture. When calcined at high temperature, due to In the present invention, the heating rate is relatively high, and the organic compound decomposes to generate gas during the heating process, which will destroy the formation of the morphology of the lithium manganate material, causing a part of the lithium manganate material to fail to form a regular spherical shape, and even the deformed morphology is incomplete.

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