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Novel preparation method of anode material LiMn2O4 of high-power-performance lithium ion battery

A cathode material, high-performance technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor material rate performance, achieve high crystallinity, ensure performance stability, and facilitate operation.

Inactive Publication Date: 2012-09-05
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of lithium manganate as a positive electrode material is the attenuation of the capacity during the cycle, such as the decomposition of Mn, the Jahn─Teller effect and the decomposition of the electrolyte, and the change of the structure, resulting in poor rate performance of the material, which limits its application.

Method used

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  • Novel preparation method of anode material LiMn2O4 of high-power-performance lithium ion battery
  • Novel preparation method of anode material LiMn2O4 of high-power-performance lithium ion battery
  • Novel preparation method of anode material LiMn2O4 of high-power-performance lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh 2.969 g of MnCl 2 ·H 2 O, dissolved in 33 mL of ethylene glycol solution, and then added dropwise 1.5─2.0 g of polyethylene glycol 2000, at 50 oC Under the condition of heating in a water bath, slowly add 2.70 g of urea (the molar ratio of manganese dichloride: urea is 1:3) while stirring, and continue stirring for 1 hour while maintaining the temperature. The mixed solution was transferred to a 50 mL polytetrafluoroethylene-lined reactor and reacted at 200°C for 12 hours. After the reactor was cooled to room temperature, the resulting precipitate was separated by filtration, washed three times with deionized water and absolute ethanol, and dried in vacuum at 80°C for 12 hours to obtain white spherical MnCO 3 Precursor.

[0039] The eutectic lithium salt 0.38Li(OH) . h 2 O─0.62LiNO 3 With the above product spherical MnCO 3 After the precursors were fully mixed according to the ratio of the substance molar ratio of 1.05:2, they were incubated at 200 °C for ...

Embodiment 2

[0042] Weigh 2.969 g of MnCl 2 ·H 2 O, dissolved in 33 mL of ethylene glycol solution, and then added dropwise 1.5─2.0 g of polyethylene glycol 2000, at 50 oC Under the condition of heating in a water bath, slowly add 2.70 g of urea (the molar ratio of manganese dichloride: urea is 1:3) while stirring, and continue stirring for 1 hour while maintaining the temperature. The mixed solution was transferred to a 50 mL polytetrafluoroethylene-lined reactor and reacted at 200°C for 24 hours. After the reactor was cooled to room temperature, the resulting precipitate was separated by filtration, washed three times with deionized water and absolute ethanol, and dried in vacuum at 80°C for 12 hours to obtain white spherical MnCO 3 Precursor.

[0043] The eutectic lithium salt 0.38LiOH·H 2 O─0.62LiNO 3 With the above product MnCO 3 After fully mixing according to the ratio of 1.1 : 2, heat preservation at 200 °C for 3 h, and then calcined at 700 °C for 8 h to obtain a black produ...

Embodiment 3

[0046] Weigh 2.969 g of MnCl 2 ·H 2 O, dissolved in 33 mL of ethylene glycol solution, and then added dropwise 1.5─2.0 g of polyethylene glycol 2000, at 50 oC Under the condition of heating in a water bath, slowly add 2.70 g of urea (the molar ratio of manganese dichloride: urea is 1:3) while stirring, and continue stirring for 1 hour while maintaining the temperature. The mixed solution was transferred to a 50 mL polytetrafluoroethylene-lined reactor and reacted at 120°C for 12 hours. After the reactor was cooled to room temperature, the resulting precipitate was separated by filtration, washed three times with deionized water and absolute ethanol, and dried in vacuum at 80°C for 12 hours to obtain white spherical MnCO 3 Precursor.

[0047] The eutectic lithium salt 0.38LiOH·H 2 O─0.62LiNO 3 With the above product MnCO 3 After fully mixing according to the ratio of 1: 2, heat preservation at 200 °C for 3 h, and then calcined at 700 °C for 8 h to obtain a black product....

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Abstract

The invention discloses a novel preparation method of an anode material LiMn2O4 of a porous micrometer-level spherical power battery, and the anode material LiMn2O4 is high in specific capacity, high in rate capability and cycle performance, low in price, environmentally-friendly, and stable in structure, and belongs to the technical field of preparation of electrode materials of lithium ion batteries. The method is mainly characterized in that a novel synthetic route in which spherical manganese carbonate is taken as a template and low-eutectic salt is inserted into the spherical manganese carbonate is adopted, so that the LiMn2O4 material is prepared at a low temperature. The LiMn2O4 material prepared by the method is regular in shape, high in purity, large in tap density, high in specific capacity, good in cycle performance, and good in rate capability. Under the charging / discharging condition of the material such as 2, 10 and 20C, the specific capacity of the material is respectively to be 118, 106 and 98mAh / g. After the circulation is carried out by 500 times, the capacity retention rate is larger than 80%. Compared with the conventional solid phase method, the method successfully controls the shape of a product due to simple operation, so that the tap density, purity, specific capacity and rate capability of the product can be improved, therefore, the method is a novel development direction for preparing the high-performance anode material.

Description

technical field [0001] The invention relates to a novel preparation method of a high-performance lithium-ion battery cathode active material. Especially the preparation of lithium manganate with micron-scale spherical pore structure and high rate performance. Background technique [0002] The storage and conversion of energy plays an important role in making full use of the earth's resources and improving the living environment of human beings at present and in the future. As an important way of energy storage and conversion—chemical power has been widely used in people's daily production. With the development of science and technology, people's requirements for the quality of living environment are getting higher and higher. Because of the advantages of "zero emission" when using electric vehicles, the society's demand for them is becoming increasingly urgent. Due to the unique properties of high voltage, high capacity, small size, light weight, and no memory effect, lith...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/1391C01G45/12
CPCY02E60/10
Inventor 邓远富周玉波施志聪陈申陈国华
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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