LiFePO4/CG compounded anode material prepared by liquid phase synthesis-microwave solid phase sintering method

A composite positive electrode material and liquid phase synthesis technology, which is applied in the direction of electrode manufacturing, battery electrodes, structural parts, etc., can solve the problem of low electronic conductivity and achieve good cycle performance, uniform heating, and low energy consumption.

Inactive Publication Date: 2009-11-04
上海微纳科技有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

For LiFePO 4 Due to the shortcomings of its own ion diffusion coefficient and low electronic conductivity, a lithium-ion power battery cathode material with high specific capacity, high energy density and excellent cycle stability, which is suitable for high-current charging and discharging, has been developed, and the LiFePO 4 / CG composite cathode material provides a novel, efficient and simple synthesis method

Method used

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  • LiFePO4/CG compounded anode material prepared by liquid phase synthesis-microwave solid phase sintering method
  • LiFePO4/CG compounded anode material prepared by liquid phase synthesis-microwave solid phase sintering method
  • LiFePO4/CG compounded anode material prepared by liquid phase synthesis-microwave solid phase sintering method

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Experimental program
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Embodiment 1

[0035] Weigh a certain amount of Fe according to the molar ratio Li:Fe:P=1.0:1.0:1.0 2 (C 2 o 4 ) 3 and LiH 2 PO 4 , dissolved in deionized water to form a solution with a concentration of 0.5mol / L, and adding CRF (carbon aerogel) and PEG400 thereto, the amount added is respectively 5% and 2% of the theoretical amount of lithium iron phosphate, stirring 1h to make CRF and PEG400 uniformly dispersed in the suspension. Then add the suspension to the reaction bottle, dry at 60°C for 1 hour, and evaporate the water to dryness to obtain the precursor powder. Then grind the obtained precursor powder and put it into a microwave oven with a frequency of 2.46GHz. Under microwave sintering, control the microwave power to 500W, and heat for 10min, you can get LiFePO 4 / CRF composite cathode material. The primary particle size of the prepared material is 1-2 μm, the discharge specific capacity reaches 152mAh / g at 0.1C rate, and 100mAh / g at 1C rate.

Embodiment 2

[0037] Weigh a certain amount of FeC according to the molar ratio Li:Fe:P=1.0:1.0:1.0 2 o 4 and LiH 2 PO 4 , dissolved in deionized water to form a solution with a concentration of 0.5mol / L, and adding CRF (carbon aerogel) and PEG400 thereto, the amount added is respectively 5% and 2% of the theoretical amount of lithium iron phosphate, stirring 1h to make CRF and PEG400 uniformly dispersed in the suspension. Then add the suspension to the reaction bottle, dry at 60°C for 1 hour, and evaporate the water to dryness to obtain the precursor powder. Then grind the obtained precursor powder and put it into a microwave oven with a frequency of 2.46GHz. Under microwave sintering, control the microwave power to 500W, and heat for 10min, you can get LiFePO 4 / CRF composite cathode material. The primary particle size of the prepared material is 1-2 μm, the discharge specific capacity reaches 148mAh / g at 0.1C rate, and 96mAh / g at 1C rate.

Embodiment 3

[0039] Weigh a certain amount of Fe according to the molar ratio Li:Fe:P=1.0:1.0:1.0 2 (C 2 o 4 ) 3 and LiH 2 PO 4 , be dissolved in deionized water to form a solution with a concentration of 0.5mol / L, and add CRF (carbon aerogel) and PEG400 thereto, the added amount is respectively 5% and 5% of the theoretical amount of lithium iron phosphate, stirring 1h to make CRF and PEG400 uniformly dispersed in the suspension. Then add the suspension to the reaction bottle, dry at 60°C for 1 hour, and evaporate the water to dryness to obtain the precursor powder. Then grind the obtained precursor powder and put it into a microwave oven with a frequency of 2.46GHz. Under microwave sintering, control the microwave power to 500W, and heat for 10min, you can get LiFePO 4 / CRF composite cathode material. The primary particle size of the prepared material is 0.5-1 μm, the discharge specific capacity reaches 165mAh / g at 0.1C rate, and 112mAh / g at 1C rate.

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Abstract

The invention relates to LiFePO4/CG (carbon gel) compounded anode material and a preparation method thereof, and belongs to the technical field of lithium ion battery material preparation. The preparation method comprises the following steps: adopting a liquid phase synthesis-microwave solid phase sintering method; weighing a certain amount of lithium source, iron source and phosphorous source according to the Li:Fe:P molar ratio of (0.9 to 1.2):(1.0 to 1.1):(1.0 to 1.1), and dissolving the lithium source, iron source and phosphorous source in deionized water to prepare a mixed suspension; adding a certain amount of CG (carbon gel) and surfactant to form a suspension through stirring; drying the suspension to obtain a powdery precursor; and obtaining the LiFePO4/CG (carbon gel) compounded anode material after the grinding and microwave sintering of the powdery precursor . The technical method has the advantages of simple process, low energy consumption, greenness and no pollution, easily controlled process, and the like. The prepared lithium ion battery compounded anode material has high purity, small primary grain size, and stable electrochemical properties under the condition of high magnification charge and discharge.

Description

technical field [0001] The present invention relates to a kind of LiFePO in the lithium ion battery 4 The invention discloses a CG (carbon gel) composite cathode material and a preparation method thereof, belonging to the technical field of battery material preparation. Background technique [0002] At present, the cathode material of commercial lithium-ion batteries is mainly LiCoO 2 , but Co is less abundant in nature and expensive, and its future development is restricted. Therefore, it is a very urgent task to find anode materials with excellent performance and low price. Since LiFePO 4 It has the advantages of low price, good safety performance and thermal stability, no pollution and high mass specific energy, so it has become one of the most potential lithium ion cathode materials. However, LiFePO 4 The disadvantage of the material is its low electronic conductivity and ion diffusion rate, which greatly limits LiFePO for electrochemical processes controlled by con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/66
CPCY02E60/12Y02E60/10
Inventor 徐云龙陶丽丽赵崇军钱秀珍徐永刚张书诚周雷黄华庆
Owner 上海微纳科技有限公司
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