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A preparation method of lithium-nickel-manganese composite oxide for high-voltage positive electrode material of lithium-ion battery

A lithium-ion battery and composite oxide technology, applied in battery electrodes, nickel compounds, manganese compounds, etc., can solve problems such as poor cycle stability and fast capacity decay, achieve improved cycle performance, increased rate performance, and simple and easy preparation process line effect

Active Publication Date: 2016-03-02
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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  • A preparation method of lithium-nickel-manganese composite oxide for high-voltage positive electrode material of lithium-ion battery
  • A preparation method of lithium-nickel-manganese composite oxide for high-voltage positive electrode material of lithium-ion battery

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Effect test

Embodiment 1

[0025] A method for preparing LiNi battery 0.5 Mn 1.5 O 4 The method of cathode material, the specific steps are:

[0026] 1) According to the stoichiometric ratio Li:Ni:Mn=1.05:0.5:1.5 (the excess lithium of 5% is to supplement the lithium element lost during high temperature calcination), weigh the target product as 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, mix and fully dissolve in 10ml deionized water, place it on a magnetic stirrer and stir at a constant speed until it is completely mixed.

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

[0028] 3) Use a peristaltic pump to drop the mixture obtained in step 2) into the metal salt mixture prepared in step 1) at a rate of 0.3 ml / min. After stirring for 1 hour at a constant temperature of 50°C, the temperature was raised to ...

Embodiment 2

[0034] A method for preparing LiNi battery 0.5 Mn 1.5 O 4 The method of cathode material, the specific steps are:

[0035] 1) According to the stoichiometric ratio Li:Ni:Mn=1.05:0.5:1.5 (the excess lithium of 5% is to supplement the lithium element lost during high-temperature calcination), weigh the target product as 2g of LiOH, Ni(CH 3 COO) 2 ·4H 2 O and Mn(CH 3 COO) 2 ·4H 2 O, mix and fully dissolve in 10ml deionized water, place it on a magnetic stirrer and stir at a constant speed until it is completely mixed.

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

[0037] 3) Use a peristaltic pump to drop the mixture obtained in step 2) into the metal salt mixture prepared in step 1) at a rate of 0.5 ml / min. After stirring for 1 hour at a constant temperature of 50°C, the temperature was raised to 80°C to obtain a...

Embodiment 3

[0043] A method for preparing LiNi battery 0.5 Mn 1.5 O 4 The method of cathode material, the specific steps are:

[0044] 1) According to the stoichiometric ratio Li:Ni:Mn=1.05:0.5:1.5 (the lithium excess 5% is 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 , Mix and fully dissolve in 10ml deionized water, place it on a magnetic stirrer and stir at a constant speed until it is completely mixed.

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

[0046] 3) Use a peristaltic pump to drop the mixture obtained in step 2) into the metal salt mixture prepared in step 1) at a rate of 0.3 ml / min. After stirring for 1 hour at a constant temperature of 50°C, the temperature was raised to 80°C to obtain a green fluffy floc.

[0047] 4...

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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 method for preparing a lithium-ion battery high-voltage positive electrode material lithium nickel manganese composite oxide, which belongs to the technical field of chemical electrode material manufacturing technology. Background technique [0002] Since the 20th century, with the rapid economic development, the environment has been deteriorating day by day and the bottleneck of energy resource shortages. 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. Widely used in portable electronic products such as notebook computers. In recent years, research on power batteries has been gradu...

Claims

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Application Information

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Patent Type & Authority Patents(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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