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Preparation method of lithium ion battery composite positive electrode material

A composite positive electrode material and lithium-ion battery technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of reduced cycle stability and service life, insufficient bonding, etc., and achieve accelerated reaction rate and completeness of reaction , maintain stability, and improve the effect of preparation efficiency

Active Publication Date: 2020-08-11
南通鼎鑫电池有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can improve the conductivity of lithium iron phosphate to a certain extent, but the special olivine structure of lithium iron phosphate will cause it to be not firmly combined with carbon materials, so its crystallization will be caused by the expansion and contraction of its volume during use. Granularization, peeling off from the carbon layer, etc., reducing its cycle stability and service life

Method used

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  • Preparation method of lithium ion battery composite positive electrode material
  • Preparation method of lithium ion battery composite positive electrode material
  • Preparation method of lithium ion battery composite positive electrode material

Examples

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Effect test

Embodiment 1

[0048] See figure 1 , A method for preparing a composite cathode material for a lithium ion battery, comprising the following steps:

[0049] S1. Weigh 18 g of analytically pure ferrous nitrate and dissolve it in 50 mL of distilled water to obtain solution A;

[0050] S2. Take 20 mL of analytical pure phosphoric acid and add 40 mL of distilled water to obtain a diluted phosphoric acid solution B;

[0051] S3. Add solution B to solution A dropwise, stir while dripping, centrifuge the resulting precipitate and wash it with distilled water 3 times, and dry it in an oven at 60°C to obtain a white precipitate C;

[0052] S4. Take 30 mL of analytically pure nitric acid and add distilled water to dilute to 100 mL to obtain nitric acid solution D;

[0053] S5. Mix analytically pure melamine and white precipitate C at a mass ratio of 1:1 and then disperse them in solution D. Control the mass ratio of solid phase substance and nitric acid solution to 0.8:1, stir for 10 minutes and place in a hydr...

Embodiment 2

[0057] See figure 1 , A method for preparing a composite cathode material for a lithium ion battery, comprising the following steps:

[0058] S1. Weigh 9g of analytically pure ferrous nitrate and dissolve it in 100mL of distilled water to obtain solution A;

[0059] S2. Take 15 mL of analytically pure phosphoric acid and add 50 mL of distilled water to obtain a diluted phosphoric acid solution B;

[0060] S3. Add solution B to solution A dropwise, stir while dripping, centrifuge the resulting precipitate and wash it with distilled water 3 times, and dry it in an oven at 60°C to obtain a white precipitate C;

[0061] S4. Take 30 mL of analytically pure nitric acid and add distilled water to dilute to 100 mL to obtain nitric acid solution D;

[0062] S5. Mix analytically pure melamine and white precipitate C at a mass ratio of 3:1 and then disperse them in solution D. Control the mass ratio of solid phase substance and nitric acid solution to 0.8:1, stir for 10 minutes and place in a hydr...

Embodiment 3

[0066] See figure 1 , A method for preparing a composite cathode material for a lithium ion battery, comprising the following steps:

[0067] S1. Weigh 11g of analytically pure ferrous nitrate and dissolve it in 80mL of distilled water to obtain solution A;

[0068] S2. Take 15 mL of analytical pure phosphoric acid and add 45 mL of distilled water to obtain a diluted phosphoric acid solution B;

[0069] S3. Add solution B to solution A dropwise, stir while dripping, centrifuge the resulting precipitate and wash it with distilled water 3 times, and dry it in an oven at 60°C to obtain a white precipitate C;

[0070] S4. Take 30 mL of analytically pure nitric acid and add distilled water to dilute to 100 mL to obtain nitric acid solution D;

[0071] S5. Mix analytically pure melamine and white precipitate C at a mass ratio of 1:1 and then disperse them in solution D. Control the mass ratio of solid phase substance and nitric acid solution to 0.8:1.1, stir for 10 minutes and place in a hydr...

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Abstract

The invention discloses a preparation method of a lithium ion battery composite positive electrode material and belongs to the technical field of lithium battery cathode material preparation. The preparation method of the lithium ion battery composite positive electrode material is characterized in that melamine is adopted as a nitrogen-rich carbon source and is coated with LiFePO4 under a hydrothermal condition, so conductivity of lithium iron phosphate is improved, more electrochemical active sites are generated, the product has a larger specific surface area and active functional groups, and more channels are provided for transmission of lithium ions; the g-C3N4 / LiFePO4 composite powder obtained by calcining the melamine-coated LiFePO4 enables transition of electrons in the material tobe easier, so the overall conductivity of the material is improved; in the g-C3N4 / LiFePO4 / FeOOH composite powder, FeOOH provides more lithium ion diffusion channels for g-C3N4 / LiFePO4, the theoreticalspecific capacity of FeOOH is high, and the lithium storage capacity is greatly improved, meanwhile, in the preparation process, gas is introduced into the hydrothermal reaction kettle, so the reaction rate and the reaction completeness are increased, and overall preparation efficiency is effectively improved.

Description

Technical field [0001] The invention relates to the technical field of lithium battery cathode material preparation, and more specifically, to a method for preparing a lithium ion battery composite anode material. Background technique [0002] The use of fuels such as petroleum and coal is likely to cause air pollution and resource depletion. The storage and conversion of energy is very critical. The development of lithium-ion batteries can make the storage and use of energy more convenient and environmentally friendly. As the lithium source supplier of lithium ion batteries and the core component of the battery, the research and application of cathode materials play an important role in improving the overall electrochemical performance of lithium ion secondary batteries. As a positive electrode material, lithium iron phosphate material is considered to be a material with good safety and no pollution to the environment. It is currently widely used in electric vehicles, base stati...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/625H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 黄剑锋
Owner 南通鼎鑫电池有限公司
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