Preparation method of low temperature graphite anode material for lithium ion battery

A lithium-ion battery, graphite negative electrode technology, applied in battery electrodes, graphene, circuits, etc., can solve the problems of inability to adapt to low-temperature operation of lithium-ion batteries, and can not effectively solve low-temperature lithium intercalation of graphite, etc. Small, highly isotropic effects

Active Publication Date: 2017-01-04
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, additives are usually added to the electrolyte to improve the interface between the electrolyte and graphite, which cannot effectively solve

Method used

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  • Preparation method of low temperature graphite anode material for lithium ion battery
  • Preparation method of low temperature graphite anode material for lithium ion battery

Examples

Experimental program
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Example Embodiment

[0020] Example 1

[0021] A preparation method of low-temperature graphite negative electrode material for lithium ion batteries includes the following steps:

[0022] 1) Disperse graphite, dispersant, and the first carbon source in a water-soluble solvent, and mix 0.5 by ultrasonic to obtain a mixed solution; the first carbon source is a mixture of glucose and phenolic resin in a mass ratio of 1:1; The graphite is natural graphite with a particle size D50=10um; the water-soluble solvent is distilled water; and the dispersant is polyvinylpyrrolidone.

[0023] 2) Grind the mixed liquid obtained in step (1) with a sand mill for 5 hours at a grinding speed of 500r / min, and then add a water-soluble solvent to make the solid content in the mixed liquid 5%;

[0024] 3) Dry the ground mixture in step (2) into powder using a spray dryer to obtain agglomerated granules. The inlet air temperature of the spray drying is 300°C, the outlet air temperature is 150°C, and the constant current pump sp...

Example Embodiment

[0027] Example 2

[0028] A preparation method of low-temperature graphite negative electrode material for lithium ion batteries includes the following steps:

[0029] 1) Disperse graphite, dispersant, and first carbon source in a water-soluble solvent, and mix them by ultrasonic for 2 hours to obtain a mixed solution; the first carbon source is a mixture of glucose and phenolic resin at a mass ratio of 1:1; The graphite is natural graphite with a particle size D50=1um; the water-soluble solvent is ethanol; and the dispersant is sodium lauryl sulfate.

[0030] 2) Grind the mixed liquid obtained in step (1) with a sand mill for 1 hour at a grinding speed of 2500r / min, and then add a water-soluble solvent to make the solid mass content in the mixed liquid 20%;

[0031] 3) Dry the ground mixture in step (2) into powder using a spray dryer to obtain agglomerated granules. The inlet air temperature of spray drying is 200°C, the outlet air temperature is 100°C, and the constant current pump...

Example Embodiment

[0034] Example 3

[0035] A preparation method of low-temperature graphite negative electrode material for lithium ion batteries includes the following steps:

[0036] 1) Disperse graphite, dispersant, and the first carbon source in a water-soluble solvent, and mix them by ultrasonic for 1.5 hours to obtain a mixed solution; the first carbon source is a mixture of polyvinyl alcohol and furfural resin at a mass ratio of 1:1 The graphite is artificial nitrograph, particle size D50=5um; the water-soluble solvent is a mixture of distilled water and ethylene glycol at a molar ratio of 1:1; the dispersant is polyvinylpyrrolidone and polyethyleneimine at a molar ratio of 1:1 1 mixed.

[0037] 2) Grind the mixed liquid obtained in step (1) with a sand mill for 3 hours at a grinding speed of 1500r / min, and then add a water-soluble solvent to make the solid mass content in the mixed liquid 10%;

[0038] 3) Dry the ground mixture in step (2) into powder using a spray dryer to obtain agglomerate...

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Abstract

The invention discloses a preparation method of a low temperature graphite anode material for a lithium ion battery. The preparation method comprises the following steps: (1) dispersing graphite, a dispersant and a first carbon source into a water-soluble solvent, and carrying out ultrasonic treatment to obtain mixed liquor; (2) grinding the mixed liquor obtained in the step (1) by the use of a sand mill, and adding a water-soluble solvent; (3) drying the mixed liquor obtained after grinding in the step (2) by the use of spray dryer into a powder so as to obtain a agglomeration granulation object; (4) adding a second carbon source and a water-insoluble solvent into the agglomeration granulation object obtained in the step (3) and adding the mixture into a high speed mixer, and stirring and mixing; and (5) carrying out high-temperature graphitization treatment on the agglomeration granulation object coated with the second carbon source in a graphitization furnace so as to obtain the low temperature graphite anode material. By a simple and efficient spray drying process for agglomeration granulation, a porous graphite secondary particle agglomerate is obtained; and by secondary surface coating, the low temperature graphite anode material for a lithium ion battery is obtained.

Description

technical field [0001] The invention relates to the technology in the field of lithium batteries, and in particular provides a method for preparing a low-temperature graphite negative electrode material for lithium ion batteries. Background technique [0002] At present, in the development process of lithium-ion batteries, the research and development of negative electrode materials has always occupied an important position. In 1990, it was the breakthrough in the research of negative electrode materials that opened the development history of commercialization of lithium-ion batteries. At present, improving the performance of negative electrode materials and researching better new negative electrode materials are still important means to improve the overall performance of lithium-ion batteries. For lithium-ion batteries, its wide application mainly depends on battery performance, safety and price. The further improvement of the performance of lithium-ion batteries depends t...

Claims

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Application Information

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IPC IPC(8): C01B32/184H01M4/36H01M4/587
CPCY02E60/10
Inventor 宋宏芳赵东辉戴涛周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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