Preparation method of LiAlO2-coated lithium manganese oxide spinel cathode material

A technology of spinel lithium manganese oxide and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of poor cycle performance and cannot meet the needs of high-performance lithium batteries, and achieve the effect of improving capacity and cycle performance

Inactive Publication Date: 2013-01-30
JIANGSU KING LITHIUM CELL
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0002] Spinel lithium manganese oxide LiMn 1.95 Cr 0.05 o 3.95 f 0.05 It is a known cathode material for lithium-ion batteries. As a cathode material for lithium-ion batteries, it has the defect of poor cycle performance and cannot meet the needs of high-performance lithium batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Embodiments of the inventive method are as follows:

[0013] 1. Mix electrolytic manganese dioxide, lithium carbonate, and chromium trioxide in a molar ratio of Li / Mn=0.51, Cr / Mn=0.026 through a three-dimensional mixer, the mixing frequency is 35Hz, and the mixing time is 3-6h.

[0014] 2. Put the mixed raw materials in an air atmosphere sintering furnace, pre-fire at 600°C for 6 hours, burn at 750°C for 10-20 hours, and then cool down with the furnace. After crushing and sieving, press balls: material = 0.5: 1 and mix on a three-dimensional mixer for 1-2 hours.

[0015] 3. Place the secondary mixed material in an air atmosphere sintering furnace, raise the temperature to 800-1000°C at a rate of 1°C~5°C / min, and keep it warm for 10-20h;

[0016] 4. Mix the obtained secondary sintered product with lithium fluoride in a molar ratio of 1:0.05 by a three-dimensional mixer, the mixing frequency is 35Hz, and the mixing time is 3-6h.

[0017] 5. Put the mixture obtained in s...

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Abstract

The invention relates to a preparation method of a LiAlO2-coated lithium manganese oxide spinel cathode material. The preparation method comprises the steps of: (a) blending electrolytic manganese dioxide, lithium carbonate and chromium oxide at a molar ratio of Li to Mn of 0.51, and a molar ratio of Cr to Mn of 0.026, crushing and mixing; (b) sintering the material mixture in an air sintering furnace, grinding, sieving, and mixing for the second time; (c) placing the mixed material in the air sintering furnace, and keeping temperature for 10 to 20 hours; (d) blending the product sintered for the second time with lithium fluoride, crushing, and mixing; (e) placing the mixture obtained in the step (d) in the air sintering furnace to obtain LiMn1.95Cr0.05O3.95F0.05; and (f) preparing a 0.2mol/L mixed solution containing lithium hydroxide monohydrate and aluminium isopropoxide, and coating to obtain the final product, namely LiAlO2-coated LiMn1.95Cr0.05O3.95F0.05. The capacity and the cycle performance of the cathode material can be improved effectively by modifying the lithium manganese oxide spinel cathode material by coating.

Description

technical field [0001] The present invention relates to the manufacture technology of lithium ion battery, relate to a kind of LiAlO 2 A method for preparing a coated spinel lithium manganate positive electrode material. Background technique [0002] Spinel lithium manganese oxide LiMn 1.95 Cr 0.05 o 3.95 f 0.05 It is a known cathode material for lithium-ion batteries. As an anode material for lithium-ion batteries, it has the defect of poor cycle performance and cannot meet the needs of high-performance lithium batteries. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a LiAlO with high capacity and good cycle performance 2 A method for preparing a coated spinel lithium manganate positive electrode material. [0004] Method of the present invention comprises the following steps: [0005] a. Using electrolytic manganese dioxide, lithium carbonate, and chromium trioxide as raw materials, the molar ratio of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/13915
CPCY02E60/122Y02E60/10
Inventor 崔立峰李奇峰王辉杨克涛
Owner JIANGSU KING LITHIUM CELL
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