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Preparation method of lithium ion battery high-voltage cathode material lithium nickel manganese composite oxide

A lithium-ion battery, composite oxide technology, applied in battery electrodes, nickel compounds, manganese compounds, etc., can solve the problems of rapid capacity decay and poor cycle stability, and achieve improved cycle performance, increased rate performance, and less impurity content. Effect

Active Publication Date: 2014-05-28
中冶瑞木新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the problem of existing Li-ion battery LiNi 0.5 mn 1.5 o 4 The positive electrode material reacts chemically with the electrolyte, the capacity decays quickly and the cycle stability is poor, so as to improve the lithium-ion battery LiNi 0.5 mn 1.5 o 4 Electrochemical properties of positive electrode materials provide a way to prepare lithium-ion batteries LiNi 0.5 mn 1.5 o 4 The method of positive electrode material

Method used

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  • Preparation method of lithium ion battery high-voltage cathode material lithium nickel manganese composite oxide
  • Preparation method of lithium ion battery high-voltage cathode material lithium nickel manganese composite oxide

Examples

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Embodiment 1

[0025] A kind of preparation lithium ion battery LiNi 0.5 mn 1.5 o 4 The method for positive electrode material, concrete steps are:

[0026] 1) According to the stoichiometric ratio Li:Ni:Mn=1.05:0.5:1.5 (the excess of 5% lithium is to supplement the lithium element lost during high-temperature calcination), the target product is 2g of Ni(CH 3 COO) 2 4H 2 O, LiCH 3 COO·2H 2 O and Mn(CH 3 COO) 2 4H 2 O, mixed and fully dissolved in 10ml deionized water, placed on a magnetic stirrer and stirred at a constant speed until completely mixed.

[0027] 2) Weigh citric acid with a molar ratio of 1:1 to metal ions and dissolve it in 5ml of deionized water, add 3ml of liquid PEG400 to it, place it on a magnetic stirrer and stir at a constant speed until completely mixed.

[0028] 3) Use a peristaltic pump to add the mixed solution obtained in step 2) to the metal salt mixed solution prepared in step 1) at a constant speed of 0.3ml / min. After stirring at a constant temperature...

Embodiment 2

[0034] A kind of preparation lithium ion battery LiNi 0.5 mn 1.5 o 4 The method for positive electrode material, concrete steps are:

[0035] 1) Weigh LiOH, Ni(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 4H 2 O, mixed and fully dissolved in 10ml deionized water, placed on a magnetic stirrer and stirred at a constant speed until completely mixed.

[0036] 2) Weigh citric acid with a molar ratio of 0.5:1 to metal ions and dissolve it in 5ml deionized water, add 0.5g PEG4000 to it, place it on a magnetic stirrer and stir at a constant speed until completely mixed.

[0037] 3) Use a peristaltic pump to add the mixed solution obtained in step 2) to the metal salt mixed solution prepared in step 1) at a constant speed of 0.5ml / min. After stirring at a constant temperature of 50° C. for 1 h, the temperature was raised to 80° C. to obtain green fluffy flocs.

[0038] 4) Put the material obtained in step 3) into a 90°C constant temperature oven and dry it at a constant temperature ...

Embodiment 3

[0043] A kind of preparation lithium ion battery LiNi 0.5 mn 1.5 o 4 The method for positive electrode material, concrete steps are:

[0044] 1) According to the stoichiometric ratio Li:Ni:Mn=1.05:0.5:1.5 (the excess of lithium is 5% to supplement the lithium element lost during high-temperature calcination), weigh the target product as 2g of Li 2 CO 3 、NiCO 3 , and MnCO 3 , mixed and fully dissolved in 10ml of deionized water, placed on a magnetic stirrer and stirred at a constant speed until completely mixed.

[0045] 2) Weigh citric acid with a molar ratio of 1.5:1 to metal ions and dissolve it in 5ml deionized water, add 0.5g CTAB to it, place it on a magnetic stirrer and stir at a constant speed until completely mixed.

[0046] 3) Use a peristaltic pump to add the mixed solution obtained in step 2) to the metal salt mixed solution prepared in step 1) at a constant speed of 0.3ml / min. After stirring at a constant temperature of 50° C. for 1 h, the temperature was ra...

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Abstract

The invention relates to a preparation method of lithium ion battery high-voltage cathode material lithium nickel manganese composite oxide, and belongs to the technical field of a manufacturing process of chemical electrode materials. A dispersing agent PEG400 serves as a carrier which a material clings to for uniform dispersion in the synthesis process of the material so as to control the appearance of particles, and the final active material is obtained by removing the dispersing agent PEG400 by a pyrolysis method. The experiment indicates that the material synthesizes by the method has a standard spinel structure, improves the cycling stability and the rate performance and has a certain popularization value.

Description

technical field [0001] The invention relates to a preparation method of lithium-nickel-manganese composite oxide, a high-voltage positive electrode material of a lithium ion battery, and belongs to the technical field of chemical electrode material manufacturing technology. Background technique [0002] Since the 20th century, along with the rapid economic development, the deteriorating environment and the bottleneck of energy resources shortage, human beings have gradually paid attention to environmental protection, and the demand for clean energy has become increasingly urgent. Since the successful development of lithium-ion batteries, they have attracted much attention for their unique advantages such as high specific energy, wide application temperature range, low self-discharge rate, no memory effect, long cycle life, and no pollution. They are widely used in mobile phones, digital cameras, Widely used in portable electronic products such as notebook computers. In rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCC01G45/1242C01G53/54H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 穆道斌吴锋马云凤吴伯荣杨磊林静赵章宏陶丹
Owner 中冶瑞木新能源科技有限公司
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