High-voltage lithium ion battery cathode material of copper-doped lithium manganate and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low reaction yield, uneven particles, harsh conditions, etc., and achieve simple preparation process, uniform particle size, and particle size. small effect

Inactive Publication Date: 2012-10-10
SOUTH CHINA NORMAL UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the preparation methods of lithium-ion battery cathode materials include solid phase method, molten salt method, aqueous solution method, co-precipitation method, hydrothermal method, ultrasonic spray pyrolysis method, template method, sol-gel method, etc., but they all have their own advantages and disadvantages. Disadvantages, such as high cost, harsh conditions, uneven particles, low reaction yield, complex process, etc.

Method used

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  • High-voltage lithium ion battery cathode material of copper-doped lithium manganate and preparation method thereof
  • High-voltage lithium ion battery cathode material of copper-doped lithium manganate and preparation method thereof
  • High-voltage lithium ion battery cathode material of copper-doped lithium manganate and preparation method thereof

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Embodiment 1

[0030] The preparation chemical formula is LiMn 1.9 Cu 0.1 o 4 Lithium manganese oxide cathode material. According to the stoichiometric ratio of 1:1.9:0.1, weigh 0.1mol lithium acetate, 0.19mol manganese acetate, and 0.01mol copper acetate with deionized water to prepare a mixed solution with a metal ion concentration of 1 mol / L, and dissolve 0.3mol citric acid into Prepare a solution with a concentration of 1 mol / L in deionized water, add the prepared metal salt mixed solution and citric acid solution into the reactor uniformly and continuously for reaction, control the reaction temperature at 70 °C, and then add ammonia water dropwise to control the pH 6, the obtained solution was continuously stirred and evaporated to dryness to obtain a gel, which was then dried in vacuum at 120° C. for 12 hours to obtain a gel precursor. The obtained gel precursor was pre-sintered at 400 °C for 5 h in an air atmosphere at a heating rate of 5 °C / min, followed by secondary sintering at ...

Embodiment 2

[0032] The preparation chemical formula is LiMn 1.9 Cu 0.1 o 4 Lithium manganese oxide cathode material. According to the stoichiometric ratio of 1:1.9:0.1, weigh 0.1mol lithium acetate, 0.19mol manganese acetate, and 0.01mol copper acetate with deionized water to prepare a mixed solution with a metal ion concentration of 0.5mol / L, and dissolve 0.6mol oxalic acid to Prepare a solution with a concentration of 0.5 mol / L in deionized water, and add the prepared metal salt mixed solution and oxalic acid solution into the reactor uniformly and continuously to react at the same time, control the reaction temperature at 80 °C, and then add ammonia water dropwise to control the pH as 7. The obtained solution was continuously stirred and evaporated to dryness to obtain a gel, which was then dried in a vacuum at 110° C. for 8 hours to obtain a gel precursor. The obtained gel precursor was pre-sintered at 450 °C for 1 h in an air atmosphere with a heating rate of 4 °C / min, followed by...

Embodiment 3

[0034] The preparation chemical formula is LiMn 1.5 Cu 0.5 o 4 Lithium manganese oxide cathode material. According to the stoichiometric ratio of 1:1.5:0.5, weigh 0.1mol lithium acetate, 0.15mol manganese acetate, and 0.05mol copper acetate with deionized water to prepare a mixed solution with a metal ion concentration of 1.5 mol / L, and dissolve 0.3mol malic acid into Prepare a solution with a concentration of 1.5 mol / L in deionized water, add the prepared metal salt mixed solution and malic acid solution to the reactor uniformly and continuously for reaction, control the reaction temperature at 90 °C, and then add ammonia water dropwise to control the pH was 7, the obtained solution was continuously stirred and evaporated to dryness to obtain a gel, which was then placed in vacuum drying at 115° C. for 10 h to obtain a gel precursor. The obtained gel precursor was pre-sintered at 500 °C for 5 h in an air atmosphere with a heating rate of 5 °C / min, followed by secondary sin...

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Abstract

The invention discloses a high-voltage lithium ion battery cathode material of copper-doped lithium manganate. The high-voltage lithium ion battery cathode material is characterized in that the general formula is LiMn2-xCuxO4, wherein x is more than or equal to 0.1 and less than or equal to 0.5. The modified cathode material is prepared by adopting a sol-gel method, and the preparation method comprises the following steps of: dissolving a soluble lithium salt, a soluble manganese salt and a soluble copper salt in deionized water to prepare a mixed solution; mixing with an acidic complexing agent solution to react, controlling the reaction temperature to be between 60 and 90 DEG C, and adjusting the pH value to be 6 to 8 by using ammonia water; continuously stirring and drying by evaporation; after drying, pre-burning the obtained gel precursor for 1 to 10 hours at 400 to 500 DEG C; and calcining the gel precursor for 8 to 16 hours at 600 to 900 DEG C to obtain a final product. The high-voltage lithium ion battery cathode material of copper-doped lithium manganate is uniform in grain diameter and stable in structure, the technical process is simple, the production cost is low, and a prepared lithium ion secondary battery has high charge-discharge cycle performance.

Description

technical field [0001] The invention relates to a lithium ion positive electrode lithium manganate material, in particular to a high voltage positive electrode material used in lithium ion batteries, so as to effectively increase and improve the power and cycle performance of lithium ion batteries. Background technique [0002] Due to the rapid development of science and technology, people's lives have been greatly improved, especially in recent decades, chemical power sources have developed rapidly. As the demand for chemical batteries is constantly improving from quantity to quality, especially in the fields of electronics, communications, automobiles, and aerospace, batteries that are small in size, light in weight, high in energy, high in power, long in life, low in cost, and environmentally friendly are required increasingly urgent. At present, most commercial cathode materials use lithium-cobalt-oxygen layered materials. Since cobalt is a relatively scarce resource an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505
CPCY02E60/122Y02E60/10
Inventor 陈红雨杨欢胡航郑聖泉李中奇
Owner SOUTH CHINA NORMAL UNIVERSITY
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