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Granulation process for high-compaction microcrystalline graphite negative electrode material

A technology of microcrystalline graphite and negative electrode materials, which is applied in the direction of graphite, negative electrodes, battery electrodes, etc., and can solve the problem of adhesive filling into microcrystalline graphite, poor secondary particle granulation effect, and increased viscosity of granulated materials, etc. problems, to achieve the effect of increasing energy consumption

Active Publication Date: 2020-08-25
HUNAN SHINZOOM TECH
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  • Abstract
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Problems solved by technology

[0005] Patents [CN201910492402.0] and [CN201910491666.4] both reported the granulation process of microcrystalline graphite. It can be found that due to the porous nature of microcrystalline graphite, it is very easy to cause the binder to fill the microcrystalline during the composite granulation process. The internal phenomenon of graphite, which causes insufficient binder content on the surface of microcrystalline graphite, which leads to poor granulation effect of secondary particles
Therefore, in order to obtain a high-pressure compacted microcrystalline graphite negative electrode material, the existing technical solution is to increase the amount of binder. However, too much binder will increase the viscosity of the granulated material, and the high viscosity of the material will easily lead to Granular equipment malfunctions due to high load operation

Method used

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  • Granulation process for high-compaction microcrystalline graphite negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] S1. Mixing: Mix 6 μm microcrystalline graphite powder with 15 μm petroleum asphalt with a softening point of 110°C using a fusion machine, the mixing mass ratio is 100:25, the speed of the fusion machine is 500 rpm, and the mixing time is 10 minutes.

[0037] S2. Low softening point granulation: heat up the fusion machine to a temperature of 107°C, adjust the rotation speed of the fusion machine to 50~200rpm, and perform fusion granulation for 60 minutes to obtain softened composite particles in which microcrystalline graphite is embedded in a binder.

[0038] S3. Preheating treatment: reduce the speed of the fusion machine to 20rpm, raise the temperature of the fusion machine to 500°C, keep warm for 3 hours, then turn off the electric heating switch of the fusion machine, cool to room temperature through the external circulating water, open the feeding valve, and turn on the reverse Transfer to blanking, and prepare preliminary particles of microcrystalline graphite and...

Embodiment 2

[0042] S1. Mixing: Mix 3 μm microcrystalline graphite powder with 13 μm coal tar pitch with a softening point of 110°C in a fusion machine, the mixing mass ratio is 100:25, the speed of the fusion machine is 500 rpm, and the mixing time is 10 minutes.

[0043] S2. Granulation with low softening point: heat up the fusion machine to a temperature of 107° C., adjust the rotation speed of the fusion machine to 100 rpm, and perform fusion and granulation for 100 minutes to obtain softened composite particles in which microcrystalline graphite is embedded in a binder.

[0044] S3. Preheating treatment: reduce the speed of the fusion machine to 20rpm, raise the temperature of the fusion machine to 500°C, keep warm for 3 hours, then turn off the electric heating switch of the fusion machine, cool it to room temperature through the external circulating water, open the feeding valve, and turn on the reverse Transfer to blanking, and prepare preliminary particles of microcrystalline graph...

Embodiment 3

[0048] S1. Mixing: Mix 6 μm microcrystalline graphite powder with 18 μm petroleum asphalt with a softening point of 105°C in a fusion machine, the mixing mass ratio is 100:25, the speed of the fusion machine is 500 rpm, and the mixing time is 10 minutes.

[0049] S2. Granulation with low softening point: heat up the fusion machine to a temperature of 102° C., adjust the rotation speed of the fusion machine to 50 rpm, and perform fusion and granulation for 60 minutes to obtain softened composite particles in which microcrystalline graphite is embedded in a binder.

[0050] S3. Preheating treatment: reduce the speed of the fusion machine to 20rpm, raise the temperature of the fusion machine to 500°C, keep warm for 3 hours, then turn off the electric heating switch of the fusion machine, cool to room temperature through the external circulating water, open the feeding valve, and turn on the reverse Transfer to blanking, and prepare preliminary particles of microcrystalline graphite ...

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Abstract

The invention discloses a granulation process for a high-compaction microcrystalline graphite negative electrode material. The preparation method comprises the following steps of putting small-granularity microcrystalline graphite powder and a large-granularity adhesive into a fusion machine for mixing, heating the fusion machine to a temperature 2-4 DEG C lower than the softening point of the adhesive, and carrying out fusion granulation for 60-120 minutes to obtain softened composite particles of microcrystalline graphite and the adhesive, and heating the fusion machine to 500-700 DEG C, keeping the temperature for 1-3 hours, cooling the material to room temperature, graphitizing, screening, demagnetizing and packaging to obtain the secondary composite particles for the high-compaction microcrystalline graphite negative electrode material. The method disclosed by the invention solves the problems that granulation equipment is overloaded and abraded due to high adhesive content, and faults are easy to occur.

Description

technical field [0001] The invention relates to a granulation process of graphite materials for lithium ion batteries, in particular to a granulation process specially used for high-pressure compacted microcrystalline graphite negative electrode materials. Background technique [0002] my country is rich in microcrystalline graphite minerals, but the utilization rate is low, and the related deep processing technology is weak. The development of microcrystalline graphite as a negative electrode material for lithium-ion batteries can not only solve the problem of insufficient deep processing technology of microcrystalline graphite, but also make use of the small grain size of microcrystalline graphite. , The advantage of low OI value, the anode material with excellent rate performance can be obtained. [0003] However, microcrystalline graphite anode materials generally have the problem of low compaction density of the pole piece. Increasing the particle size can improve the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525C01B32/205C01B32/21B01J2/28
CPCH01M4/587H01M4/621H01M10/0525C01B32/205C01B32/21B01J2/28H01M2004/027Y02E60/10
Inventor 石磊皮涛邵浩明徐燕宁舒平
Owner HUNAN SHINZOOM TECH
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