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A preparation method of graphite negative electrode material for low-temperature high-rate power battery

A technology of graphite negative electrode and power battery, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of low temperature lithium intercalation of graphite, low rate charging and discharging of power battery, etc. The effect of high homosexuality

Active Publication Date: 2018-11-13
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

[0003] In view of this, the present invention aims at the deficiencies in the prior art. The purpose of the present invention is to provide a method for preparing a low-temperature high-rate power battery graphite negative electrode material, which can effectively solve the problem of low-temperature lithium intercalation in graphite and low-rate charge and discharge of power batteries. question

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  • A preparation method of graphite negative electrode material for low-temperature high-rate power battery

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Embodiment 1

[0026] A method for preparing a low-temperature high-rate power battery graphite negative electrode material, comprising the following steps:

[0027] (1) Shaping and crushing

[0028] Add natural flake graphite into the pulverizer to carry out agitation ball mill, and use wet agitation mill for shaping; the wet agitation mill shaping process conditions include: using spherical zirconia with a diameter of 1-3mm as the grinding medium, using ammonium polyacrylate As a grinding aid, add natural flake graphite, grinding medium, grinding aid, and solvent into the ball mill together. The mass fraction of solvent in the whole system is 70%. %, spheroidal ink machine frequency: 30HZ, spheroidal ink time: 8h, the particle size of the prepared graphite is D50=2um. The natural flake graphite is spherical graphite with purity C≥99.5%, particle size D50=15um, and the solvent is distilled water and ethanol.

[0029] (2) intercalation micro-expansion

[0030] After mixing the graphite po...

Embodiment 2

[0037] A method for preparing a low-temperature high-rate power battery graphite negative electrode material, comprising the following steps:

[0038] (1) Shaping and crushing

[0039] Add natural flake graphite into the pulverizer to carry out agitation ball mill, and use wet agitation mill for shaping; the wet agitation mill shaping process conditions include: using spherical zirconia with a diameter of 1-3mm as the grinding medium, using ammonium polyacrylate Or sodium hexametaphosphate as a grinding aid, adding natural flake graphite, grinding media, grinding aids, and solvents into the ball mill together, the solvent mass fraction in the entire system is 90%, and the amount of grinding media and grinding aids is graphite mass 10 times, 0.1%, nodular ink machine frequency: 50HZ, nodular ink time: 4h, the particle size of the prepared graphite is D50=10um. The natural flake graphite is spherical graphite with a purity C≥99.5%, and a particle size D50=20um; the solvent is a...

Embodiment 3

[0048] A method for preparing a low-temperature high-rate power battery graphite negative electrode material, comprising the following steps:

[0049] (1) Shaping and crushing

[0050] Add natural flake graphite into the pulverizer to carry out agitation ball mill, and use wet agitation mill for shaping; the wet agitation mill shaping process conditions include: using spherical zirconia with a diameter of 1-3mm as the grinding medium, using ammonium polyacrylate Or sodium hexametaphosphate as a grinding aid, adding natural flake graphite, grinding media, grinding aids, and solvents into the ball mill together, the solvent mass fraction in the entire system is 80%, and the amount of grinding media and grinding aids is graphite mass 8 times, 0.3%, nodular ink machine frequency: 40HZ, nodular ink time: 6h, the particle size of the prepared graphite is D50=6um. The natural flake graphite is spherical graphite with purity C≥99.5%, particle size D50=18um, and the solvent is distill...

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Abstract

The invention discloses a preparation method of a low-temperature and high-rate graphite anode material for a power battery. The method comprises the following steps: carrying out agglomeration pelletizing by a simple and efficient spray drying process and obtaining a porous graphite secondary particle cluster; and carrying out secondary surface coating and obtaining a low-temperature graphite anode material for a lithium-ion battery. In the anode material structure, a certain pre-expansion space is prefabricated in each particle of graphite which is modified by a micro-expansion technology, so that damage to a 'core-shell' structure due to graphite expansion is effectively inhibited in charge and discharge processes; the 'core-shell' structure is relatively well maintained; and particularly, the graphite anode material has good cycling stability in quick charge and discharge processes. After micron graphite is pelletized, primary graphite particles are agglomerated into secondary particles in a porous carbon matrix in the core; the isotropic degree is high; and single-direction expansion and shrinkage caused by charge and discharge are small, so that the low-temperature lithium intercalation performance and rate capability of the low-temperature and high-rate graphite anode material are greatly improved.

Description

technical field [0001] The invention relates to the technology in the battery field, and in particular provides a method for preparing a graphite negative electrode material for a low-temperature high-rate power battery. Background technique [0002] Carbon materials have the advantages of low chemical potential, good cycle performance, low price, and environmental friendliness, and are currently the most ideal and commonly used anode materials for lithium-ion batteries. Among carbon materials, compared with soft carbon and hard carbon, graphite materials have obvious advantages in terms of specific capacity, discharge platform and cost. Lithium ions intercalate between graphite layers to form Li 6 C intercalation compound with a theoretical capacity of 372mAh / g. However, the layered structure of graphite also leads to the emergence of low temperature problems. The interlayer spacing of graphite remains basically unchanged at low temperatures, while the ion diffusion capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62H01M4/1393C01B32/225
CPCH01M4/1393H01M4/583H01M4/625Y02E60/10
Inventor 戴涛宋宏芳赵东辉周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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