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Secondary granulation process of multi-phase powder

A secondary granulation and powder technology, which is applied to structural parts, electrical components, battery electrodes, etc., can solve problems such as poor surface performance, poor product quality stability, and difficult to control the improvement effect of electrochemical comprehensive performance, and achieve the elimination of surface The effect of performance difference and stable quality

Active Publication Date: 2022-02-01
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since the surface properties of the materials in each phase will inevitably be different, this will lead to differences in the infiltration, spreading, and bonding effects of the adhesive on the surface of the primary particles of each phase. Uniform granulation brings adverse effects, and some primary particles with poor surface properties cannot even participate in granulation, which ultimately leads to poor product quality stability, and it is difficult to control the improvement effect of electrochemical comprehensive performance

Method used

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  • Secondary granulation process of multi-phase powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, preliminarily mix the multi-phase powder to obtain a mixture; the multi-phase powder refers to solid powder materials with three or more phases, including but not limited to raw coke powder, calcined coke powder, hard carbon Powder, polymer powder, graphite powder, carbon black, powdered graphene, powdered carbon nanotube, powdered carbon fiber, nano-silicon, crystalline silicon, SiO, tin alloy and other conventional lithium-ion battery anode materials and its raw materials.

[0032] In this embodiment, the multi-phase powder is preferably green coke, spherical microcrystalline graphite, and hard carbon, and the mass ratio of the green coke, spherical microcrystalline graphite, and hard carbon is 100:20:3. Among them, the green coke used is coal-based needle coke produced in Henan, with a volatile content of 5.8%. The green coke was processed into a powder of 8.0 μm by jet mill before the experiment. The spherical microcrystalline graphite used was purchased in ...

Embodiment 2

[0037] In this embodiment, the multi-phase powder is preferably green coke, spherical microcrystalline graphite, and hard carbon, and the mass ratio of the green coke, spherical microcrystalline graphite, and hard carbon is 100:10:2. Among them, the green coke used is coal-based needle coke produced in Henan, with a volatile content of 5.3%. The green coke was processed into a powder of 8.0 μm by jet mill before the experiment. The spherical microcrystalline graphite used was purchased in Northeast China, with a particle size of 5.0 μm and an ash content of ≤1%. The hard carbon used is a hard carbon material produced in Japan, with a particle size of 10.1 μm.

[0038]Mix green coke, spherical microcrystalline graphite and hard carbon VC according to the above fixed ratio, the mixing time is 45min, and the stirring speed is 250rpm. Then the mixture was transferred into a kneading pot, and ethylene tar was added at a rate of 1 liter of ethylene tar per kilogram of the mixture, ...

Embodiment 3

[0041] In this embodiment, the multi-phase powder is preferably green coke, spherical microcrystalline graphite, and hard carbon, and the mass ratio of the green coke, spherical microcrystalline graphite, and hard carbon is 100:30:6. Among them, the green coke used is coal-based needle coke produced in Henan, with a volatile content of 6.2%. The green coke was processed into a powder of 8.0 μm by jet mill before the experiment. The spherical microcrystalline graphite used was purchased in Northeast China, with a particle size of 5.0 μm and an ash content of ≤1%. The hard carbon used is a hard carbon material produced in Japan, and the particle size is about 10 μm.

[0042] Mix green coke, spherical microcrystalline graphite and hard carbon VC according to the above fixed ratio, the mixing time is 60min, and the stirring speed is 300rpm. Then the mixture was transferred into a kneading pot, and ethylene tar was added at a ratio of 3 liters of ethylene tar per kilogram of the m...

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Abstract

The invention discloses a secondary granulation process of multi-phase powder. In the process, firstly, the multi-phase powder is mixed through solid-phase mechanical mixing to realize preliminary mixing; secondly, the mixture is transferred into a kneading pot, and an appropriate amount of ethylene tar is added for kneading , to obtain a uniformly mixed wet material; again, the wet material is fused in liquid phase to obtain a dry, surface-modified multi-phase mixture; finally, the multi-phase mixture is mixed with asphalt VC, and then granulated, graded, and Heat treatment, screening, packaging. The invention solves the problem of non-uniform bonding of multi-phase powder existing in the traditional granulation process.

Description

technical field [0001] The invention relates to a manufacturing process for lithium-ion battery negative electrode materials, in particular to a multi-phase powder secondary granulation process for preparing lithium-ion battery negative electrode materials. Background technique [0002] Granulation technology is an important powder processing technology. Broadly speaking, as long as the process of agglomerating small particles into large particles can be called granulation, however, in the production process of lithium-ion battery negative electrodes, we generally The process of making secondary particles through a binder is called granulation. The granulation process has been developed for more than 200 years, but it has only been used in lithium-ion battery anode materials for only 20 years. Moreover, due to the implicit protection of this technology by Japanese anode companies and individual domestic anode companies, it has caused Granular technology did not begin to be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/532C04B35/626C04B35/83H01M4/62
CPCC04B35/522C04B35/532C04B35/62695C04B35/83H01M4/625C04B2235/428C04B2235/5288C04B2235/48Y02E60/10
Inventor 石磊邵浩明皮涛王志勇黄越华
Owner HUNAN SHINZOOM TECH