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Preparation method of coated spinel lithium manganate composite cathode material

A technology of spinel lithium manganate and composite cathode material, applied in chemical instruments and methods, manganate/permanganate, battery electrodes, etc., can solve the problems of reducing battery capacity, expansion, lattice distortion, etc. , to achieve the effect of improving high temperature cycle performance

Inactive Publication Date: 2014-04-23
深圳市天骄科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the secondary lithium-ion battery made of spinel-type lithium manganate in the existing technical conditions has the following problems during the cycle charge and discharge process at high temperature (50-60°C): The compatibility of lithium manganate is poor, and the electrolyte is easy to decompose on its surface, which reduces the amount of conductive medium in the packaged battery. Mn in spinel lithium manganate 3+ It is prone to disproportionation reaction to generate Mn2+ and Mn4+, among which Mn2+ is easily soluble in the electrolyte and decreases continuously, thereby promoting the reaction to the direction of decomposition, so that the Mn in spinel lithium manganate 3+ A large loss, which in turn reduces the capacity of the battery
[0004] In addition, spinel lithium manganate (LiMn 2 o 4 ) also has inherent problems, that is, poor cycle performance and rapid capacity decay. It is generally believed that the main reason is that the existence of Mn3+ produces the Jahn-Teller effect, and the material undergoes lattice distortion during charge and discharge, resulting in volume shrinkage or expand

Method used

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  • Preparation method of coated spinel lithium manganate composite cathode material
  • Preparation method of coated spinel lithium manganate composite cathode material
  • Preparation method of coated spinel lithium manganate composite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dissolve manganese sulfate and nickel sulfate with deionized water according to the molar ratio of 3:1 to prepare 0.1mol / L salt solution A;

[0034] Weigh an appropriate amount of sodium hydroxide and configure it with deionized water to form 0.2mol / L precipitant B;

[0035] Weigh 1000g of manganese dioxide and 10L of pure water and stir evenly, then put into coprecipitation reactor;

[0036] Take the prepared 10L salt solution A and 10L precipitant B and put them into the co-precipitation reactor at a certain flow rate with a pump at the same time for coating reaction, control the reaction pH value at 10.0, after the reaction is completed, filter the obtained slurry and use After washing with deionized water for 5 times and drying, the coating precursor was obtained.

[0037] Lithium carbonate and the above-mentioned coating precursor are mixed in a mixer until the molar ratio Li: M=0.52.

[0038] The mixture is put into a sintering kiln, sintered at 900°C for 10 hou...

Embodiment 2

[0044] Dissolve manganese sulfate and nickel sulfate in deionized water at a molar ratio of 3:1 to prepare 0.1 mol / L salt solution A.

[0045] Weigh an appropriate amount of sodium hydroxide and configure it with deionized water to form 0.2mol / L precipitant B.

[0046] Weigh 1000g of manganese dioxide and 10L of pure water and stir evenly, then put them into the co-precipitation reactor.

[0047] Take the prepared 6L salt solution A and 6L precipitant B and add them into the co-precipitation reactor at a certain flow rate with a pump at the same time for coating reaction, control the reaction pH value at 10.0, after the reaction is completed, filter the obtained slurry and use After washing with deionized water for 5 times and drying, the coating precursor was obtained.

[0048] Lithium carbonate and the above-mentioned coating precursor are mixed in a mixer until the molar ratio Li: M=0.52.

[0049] The mixture is put into a sintering kiln, sintered at 900°C for 10 hours, c...

Embodiment 3

[0061] Dissolve manganese sulfate and nickel sulfate in deionized water at a molar ratio of 3:1 to prepare 0.1 mol / L salt solution A.

[0062] Weigh an appropriate amount of sodium carbonate and configure it with deionized water to form a 0.1mol / L alkaline solution B.

[0063] Weigh 1000g of trimanganese tetraoxide and 10L of pure water and stir evenly, then put them into the co-precipitation reactor.

[0064] Take the prepared 12L salt solution A and 12L alkali solution B and put them into the co-precipitation reactor at a certain flow rate with a pump at the same time for coating reaction, control the reaction pH value at 10.0, after the reaction is completed, filter the obtained slurry and use After washing with deionized water for 5 times and drying, the coating precursor was obtained.

[0065] Lithium hydroxide and the above-mentioned coating precursor are mixed in a mixer until the molar ratio Li:M=0.52.

[0066] The mixture is put into a sintering kiln, sintered at 90...

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Abstract

The invention discloses a preparation method of a coated spinel lithium manganate composite cathode material, which mainly comprises the following steps: dissolving soluble nickel salts and soluble manganese salts so as to obtain a mixed solution A with a certain concentration; preparing a precipitator B with a certain concentration; uniformly mixing a lithium manganate precursor with pure water, and putting the obtained mixture into a coprecipitation reaction kettle; simultaneously adding the solutions A and B into the coprecipitation reaction kettle to carry out a precipitation reaction, so as to obtain coated lithium manganate precursor slurry; and washing and drying so as to obtain a coated precursor; uniformly mixing lithium salts with the coated precursor in a molar ratio of (Li: M) being 0.48-0.6, wherein M refers to the total metal content of the coated precursor; and carrying out high-temperature calcination on the obtained mixture, cooling the obtained object to room temperature, and then crushing and sieving the obtained product so as to obtain the lithium ion battery cathode material. The spinel lithium manganate cathode material prepared according to the preparation method disclosed by the invention has an excellent high-temperature cycle performance, and is of great practical significance.

Description

technical field [0001] The invention relates to the field of lithium manganate positive electrode materials for lithium ion batteries, in particular to the technical field of preparation methods of spinel lithium manganate composite positive electrode materials. Background technique [0002] Spinel lithium manganese oxide LiMn 2 o 4 It is the cathode material with three-dimensional lithium ion channels that Hunter first produced in 1981. It has been greatly concerned by many scholars and researchers at home and abroad. As an electrode material, it has low price, high potential, environmental friendliness, and high safety performance. Advantages, is the most promising replacement for lithium cobalt oxide LiCoO 2 Become the cathode material of a new generation of lithium-ion batteries. [0003] However, the secondary lithium-ion battery made of spinel-type lithium manganate in the existing technical conditions has the following problems during the cycle charge and discharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505
CPCY02E60/122C01G45/12C01G53/50H01M4/505H01M4/525Y02E60/10
Inventor 丁倩倩陈光森王伟东
Owner 深圳市天骄科技开发有限公司