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Preparation method for lithium ion battery cathode materials

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems that the high rate performance of synthetic cathode materials cannot be effectively guaranteed, and it is difficult to control them at the same time.

Active Publication Date: 2011-10-26
ZHEJIANG UNIV
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Problems solved by technology

This one-step calcination method is difficult to simultaneously control the structural factors that play a key role in the high-rate performance of the synthesized material, including crystallinity, particle size, and the content of high-conductivity phases in the material, so the high-rate performance of the synthesized cathode material is obtained. less than effective guarantee

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  • Preparation method for lithium ion battery cathode materials
  • Preparation method for lithium ion battery cathode materials
  • Preparation method for lithium ion battery cathode materials

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preparation example Construction

[0017] The preparation method of the positive electrode material of the lithium ion battery provided by the present invention comprises (1) providing the precursor of the positive electrode material of the lithium ion battery; The precursor is subjected to at least two calcination processes in the temperature range of 300-900°C.

[0018] In the preparation method of the present invention, the provision of the precursor of the lithium ion positive electrode material can adopt any technology used in the art to prepare the precursor of the lithium ion positive electrode material. These techniques include but are not limited to: in the solid phase method, various raw material sources (such as iron source, phosphorus source, lithium source, and optional carbon source, etc.) of the synthetic precursor are directly mechanically milled in the solid phase to synthesize the precursor; The raw materials are ball-milled in distilled water, ethanol, acetone and other liquid media, and the ...

Embodiment 1

[0042] Using ferrous oxalate, ammonium dihydrogen phosphate, and lithium hydroxide with a molar ratio of 1:1:1 as raw materials, and ethylene glycol with a molar ratio of 1:1 to metal cations as a carbon source, the above initial materials were prepared in an ethanol medium Carry out mechanical ball milling on the ball mill, and the ball milling time is 4 hours. The ball milled product was stirred at 80°C to remove the solvent and further dried in a drying oven, then the dried powder material was ball milled and then calcined at 600°C for 20 hours in an argon-hydrogen mixed atmosphere containing a small amount of hydrogen , and then calcined at 700 ° C for 4 hours to obtain a small amount of Fe 2 P carbon coated LiFePO 4 Material. Electrochemical tests show that the capacity of the obtained material reaches 120, 110 and 100mAh / g at discharge rates of 5C, 10C and 20C, respectively.

[0043] To the LiFePO obtained in embodiment 1 4 The material was scanned with a scanning el...

Embodiment 2

[0046] Taking ferrous oxalate, ammonium dihydrogen phosphate and lithium carbonate as initial raw materials in a molar ratio of 1:1:1, the above raw materials were mechanically ball milled in an acetone medium for 3 hours. The ball-milled product was dried in a drying oven at 100° C., and then the dried product was pre-sintered at 350° C. for 2 hours in a nitrogen atmosphere. The pre-sintered product is ball milled, then calcined at 600°C for 15 hours in a nitrogen-hydrogen mixed atmosphere containing a small amount of hydrogen, and then calcined at 700°C for 5 hours to obtain a carbon-free but containing a small amount of Fe 2 LiFePO of P and FeP 4 Material. The material is used as the positive electrode material of the lithium ion battery and has excellent high-rate and ultra-high-rate charge and discharge characteristics.

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Abstract

The invention provides a preparation method for lithium ion battery cathode materials. Specifically, various synthesis methods like solid phase method and liquid phase method are adopted to prepare a precursor of lithium ion battery cathode materials such as LiFePO4. Then the precursor is subjected to joint calcination at a changing temperature. Thus, optimal design and control of the structure and appearance of the synthesized lithium ion battery cathode materials can be realized. Therefore, a preparation method for lithium ion battery electrode materials with high-rate and ultra high-rate charge-discharge performance is obtained.

Description

technical field [0001] The invention relates to a preparation method of a cathode material for a lithium ion battery, which belongs to the technical field of energy materials, and specifically relates to a method for combining a precursor of an anode material of a lithium ion battery prepared by various synthesis methods such as a solid phase method and a liquid phase method. Calcination, to achieve the optimal design and control of the structure and morphology of the synthesized lithium-ion battery cathode material, so as to obtain the preparation method of lithium-ion battery electrode materials with high rate and ultra-high rate charge and discharge characteristics. Background technique [0002] Lithium-ion batteries are green secondary batteries developed in the 1990s. Compared with traditional secondary batteries such as lead-acid, nickel-cadmium, and nickel-metal hydride, lithium-ion batteries have high reversible capacity, good cycle stability, and energy density. It ...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/1397H01M4/58
CPCY02E60/10
Inventor 高明霞潘洪革叶欣刘永锋
Owner ZHEJIANG UNIV
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