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A kind of preparation method of micro hollow sphere graphite negative electrode material

A graphite anode, hollow technology, applied in chemical instruments and methods, battery electrodes, carbon compounds, etc., can solve the problem that graphite anode materials cannot take into account high energy density, etc., and achieve good rate cycle performance, high capacity characteristics, high economy and efficiency. Effects of Environmental Values

Active Publication Date: 2021-12-31
赣州市瑞富特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a method for preparing a graphite negative electrode material with tiny hollow spheres. Technical issues with discharge performance

Method used

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  • A kind of preparation method of micro hollow sphere graphite negative electrode material
  • A kind of preparation method of micro hollow sphere graphite negative electrode material
  • A kind of preparation method of micro hollow sphere graphite negative electrode material

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Embodiment 1

[0035] This specific embodiment is to prepare a tiny hollow spherical graphite negative electrode material, and its general steps are:

[0036] Step 1. Selection and pretreatment of the core material; take barium sulfate powder as the core material of the tiny hollow spherical graphite negative electrode material, use a high-speed coating kettle to disperse and preheat it, and then add 1801 type to the high-speed coating kettle. Stearic acid acts as a surfactant to coat the barium sulfate particles;

[0037] Among them, the median particle size of barium sulfate is controlled to be 15-20 μm, the purity is greater than or equal to 98%, the Fe content is less than or equal to 0.004%, and the specific gravity of barium sulfate is 4.0-4.5g / cm 3 , moisture content ≤ 0.15%;

[0038] The dispersing rotation speed of the dispersion preheating is controlled to be 50 r / min, the preheating temperature is 250 °C, and the temperature is increased at a heating rate of 3 °C per minute, and ...

Embodiment 2

[0046] This specific embodiment is to prepare a tiny hollow spherical graphite negative electrode material, and its general steps are:

[0047] Step 1. Selection and pretreatment of the core material; take barium sulfate powder as the core material of the tiny hollow spherical graphite negative electrode material, use a high-speed coating kettle to disperse and preheat it, and then add 1801 type to the high-speed coating kettle. Stearic acid acts as a surfactant to coat the barium sulfate particles;

[0048] Among them, the median particle size of barium sulfate is controlled to be 15-20 μm, the purity is greater than or equal to 98%, the Fe content is less than or equal to 0.004%, and the specific gravity of barium sulfate is 4.0-4.5g / cm 3 , moisture content ≤ 0.15%;

[0049] The dispersing rotation speed of the dispersion preheating is controlled to be 30 r / min, the preheating temperature is 300 °C, and the temperature is increased at a heating rate of 2 °C per minute, and ...

Embodiment 3

[0057] This specific embodiment is to prepare a tiny hollow spherical graphite negative electrode material, and its general steps are:

[0058] Step 1. Selection and pretreatment of the core material; take barium sulfate powder as the core material of the tiny hollow spherical graphite negative electrode material, use a high-speed coating kettle to disperse and preheat it, and then add 1801 type to the high-speed coating kettle. Stearic acid acts as a surfactant to coat the barium sulfate particles;

[0059] Among them, the median particle size of barium sulfate is controlled to be 15-20 μm, the purity is greater than or equal to 98%, the Fe content is less than or equal to 0.004%, and the specific gravity of barium sulfate is 4.0-4.5g / cm 3 , moisture content ≤ 0.15%;

[0060] The dispersing rotation speed of the dispersion preheating is controlled to be 80 r / min, the preheating temperature is 150 °C, and the temperature is increased at a heating rate of 5 °C per minute, and ...

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Abstract

The invention discloses a preparation method of a micro hollow sphere graphite negative electrode material. The method aims to solve the technical problem that the existing graphite negative electrode material cannot take into account high energy density while improving its cycle life and fast charge and discharge performance. The general steps of the method are as follows: firstly select a suitable core material and perform pretreatment, then select a suitable shell material and perform treatment, then use asphalt binder to coat the core material to make a sphere, and finally the spherical coating particles Perform high-temperature graphitization to obtain graphite negative electrode materials with tiny hollow spheres. In this method, the graphite negative electrode material is made into a hollow sphere structure, which not only has high capacity characteristics, but also has good rate cycle performance, thereby improving the specific capacity, charge-discharge rate and cycle performance of the graphite negative electrode material; at the same time, this method belongs to The reuse of waste materials has high economic and environmental value.

Description

technical field [0001] The invention belongs to the field of preparation of graphite anode materials for lithium batteries, in particular to a preparation method of micro-hollow spherical graphite anode materials. Background technique [0002] Compared with ordinary batteries, lithium-ion batteries have been rapidly popularized in mobile phones, notebook computers, etc. due to their high energy density, long cycle life, and no memory effect. The requirements for multi-function and long-term driving are constantly increasing, and the requirements for lithium-ion battery capacity are also increasing. At present, the improvement of lithium-ion battery capacity mainly depends on the development and improvement of negative electrode materials. Therefore, for a long time, improving the specific capacity of lithium-ion battery negative electrode materials, reducing the first irreversible capacity, and improving rate characteristics have been research and development for lithium-ion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/205H01M4/587H01M4/62H01M10/0525
CPCC01B32/205H01M4/587H01M4/62H01M10/0525Y02E60/10
Inventor 韩峰彭渊敏韩少峰杨栋梁郭峰
Owner 赣州市瑞富特科技有限公司
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