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Preparation method of doping-modified spinel-type lithium manganate

A type of lithium manganate and spinel technology is applied in the field of preparation of doped modified spinel type lithium manganate, which can solve the problems of long preparation time, high cost, complicated process and the like, and achieves improved electrochemical performance, The effect of improving crystallization performance

Inactive Publication Date: 2015-03-04
LIUZHOU HAOXIANGTE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle of the existing sol-gel method is that a variety of metal cations can form chelates with organic acids, and the chelates can be polymerized with polyhydroxy acids to form a solid polymer precursor with uniform distribution of cations. The final product can be obtained by heat treatment of the precursor; however, the preparation time of this method is long, the process is complicated, the vacuum heat treatment process is difficult to control, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, prepare a mixed solution with 1mol lithium acetate, 0.2mol chromium acetate, 0.4mol nickel acetate, and 1.4 mol manganese acetate, then add 3mol resorcinol into the mixed solution and keep stirring until it is completely dissolved, add 7mol formaldehyde solution, Then place it in a constant temperature water bath at 50°C for 10 hours to form a gel, then place the gel in an oven at 70°C to fully dry, then raise the temperature to 300°C in an electric furnace at a rate of 8°C / min, and pre-heat at a constant temperature for 8 hours. Sintering, after the pre-sintered product is ground evenly, the temperature is raised to 550°C in the electric furnace at a rate of 4°C / min, and then the second sintering is carried out at a constant temperature for 8 hours, and finally the second sintered product is fully ground to obtain modified lithium manganate . After detection and analysis, the initial discharge specific capacity of the chromium-doped nickel-modified lithium manga...

Embodiment 2

[0029] First, prepare a mixed solution with 1mol lithium acetate, 0.2mol chromium acetate, 0.4mol nickel acetate, and 1.4 mol manganese acetate, then add 5mol resorcinol into the mixed solution and keep stirring until it is completely dissolved, then add 7.5mol formaldehyde solution , and then put it in a constant temperature water bath at 60°C for 12 hours to form a gel, then place the gel in an oven at 80°C to fully dry, then raise the temperature to 360°C in an electric furnace at a rate of 10°C / min, and keep the gel at a constant temperature for 10 hours Pre-sintering, after the pre-sintered product is ground evenly, the temperature is raised to 750°C at a rate of 5°C / min in the electric furnace, and then the second sintering is carried out at a constant temperature for 10 hours, and finally the second sintered product is fully ground to obtain a modified spinel Lithium manganese oxide. After detection and analysis, the first discharge specific capacity of the modified lit...

Embodiment 3

[0031] First, prepare a mixed solution with 1mol lithium acetate, 0.2mol chromium acetate, 0.4mol nickel acetate, and 1.4 mol manganese acetate, then add 7mol resorcinol into the mixed solution and keep stirring until it is completely dissolved, add 8mol formaldehyde solution, Then place it in a constant temperature water bath at 70°C for 14 hours to form a gel, then place the gel in an oven at 90°C to fully dry, then raise the temperature to 400°C in an electric furnace at a rate of 10°C / min, and pre-heat at a constant temperature for 12 hours. Sintering, after the pre-sintered product is ground evenly, the temperature is raised to 950°C in an electric furnace at a rate of 6°C / min, and then the second sintering is carried out at a constant temperature for 12 hours, and finally the second sintered product is fully ground to obtain a modified spinel Lithium manganese oxide. After detection and analysis, the first discharge specific capacity of the modified lithium manganate pre...

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Abstract

The invention relates to preparation of lithium ion positive pole materials and especially relates to a preparation method of doping-modified spinel-type lithium manganate. The preparation method comprises the following steps of preparing a mixed solution of lithium acetate, chromium acetate, nickel acetate and manganese acetate, adding resorcinol into the mixed solution, carrying out stirring until resorcinol is completely dissolved, adding a formaldehyde solution into the obtained mixed solution, putting the mixed solution into a constant-temperature water bath, carrying out a reaction process to obtain gel, drying the gel by an oven, carrying out pre-sintering, grinding the pre-sintered product, carrying out secondary sintering, and grinding the re-sintered product to obtain the modified spinel-type lithium manganate. The preparation method utilizes lithium acetate, manganese acetate, chromium acetate, nickel acetate, resorcinol and formaldehyde as raw materials to prepare the doping-modified spinel-type lithium manganate, utilizes pre-sintering to improve product phase purity, utilizes secondary sintering to improve material crystallization performances, specific discharge capacity and energy density, and utilizes a reasonable raw material ratio to improve material electrochemical performances.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion cathode materials, in particular to a preparation method of doped modified spinel lithium manganate. Background technique [0002] Spinel-type lithium manganese oxide has become the first choice for the positive electrode material of power lithium-ion batteries because of its rich manganese resources, low cost, good safety, no environmental pollution, and easy preparation, but it hinders the formation of power battery-type lithium manganate industrialization capacity. The main reason is that its performance is not stable enough, that is, its capacity decays quickly during the charge-discharge cycle, especially at high temperatures. The main factors affecting its cycle performance are: 1. The purity and stability of the phase structure, and the irregular microscopic morphology; 2. The Jahn-Teller effect of the material itself; 3. The dissolution of manganese in the lithium manganate materi...

Claims

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Application Information

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IPC IPC(8): H01M4/505C01G45/12
CPCC01G45/12H01M4/505Y02E60/10
Inventor 易鉴荣林荔琍唐臻吴坚任文忠
Owner LIUZHOU HAOXIANGTE SCI & TECH
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