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Composite surface modification method for negative electrode materials of lithium ion batteries

A technology for lithium-ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of uneven surface coating modification and high cost of materials, and solve the problems of poor graphite rate performance, high production efficiency, and low cost. Reduced effect

Active Publication Date: 2021-08-06
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a composite surface modification method for negative electrode materials of lithium-ion batteries, which solves the shortcomings of existing negative electrode materials such as high cost and uneven material surface coating modification , effectively improve the efficiency and uniformity of the material surface modification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]In the first step, the calcined petroleum coke, the organic molecule with a large л bond conjugated structure, and the silicon powder are pulverized separately, so that the particles are pulverized to 150 mesh. The second step, according to weight parts: 100 parts of calcined petroleum coke, 30 parts of organic molecules with large л bond conjugated structure, 5 parts of silicon powder are thrown into the mixing batch machine, and the speed of the mixing batch machine is adjusted to 80r / s , the batch mixing time is 3 hours, so that organic molecules with large л bond conjugated structure can be evenly bonded on the surface of calcined petroleum coke. The third step is to put the mixed graphite into the vertical reaction kettle, adjust the rotation speed of the reaction kettle to 80r / s, heat in the furnace, and carry out the first roasting treatment at room temperature to 200°C for 0.5 hours, and the first roasting treatment The final material is pulverized for the first ...

Embodiment 2

[0029] In the first step, needle coke, organic molecules with large л-bond conjugated structure, and silicon oxide are pulverized separately, so that the particles are pulverized to 240 mesh. Step 2, in parts by weight: 80 parts of needle coke, 10 parts of organic molecules with a large л bond conjugated structure, and 1 part of silicon oxide are thrown into the mixing batch machine, and the rotating speed of the mixing batch machine is adjusted to 10r / s, The mixing time is 2 hours, so that the organic molecules with large л bond conjugated structure can be evenly bonded on the surface of the needle coke. The third step is to put the mixed graphite into the vertical reaction kettle, adjust the rotation speed of the reaction kettle to 10r / s, heat in the furnace, and carry out the first roasting treatment at room temperature to 200°C for 10 hours, and the first roasting treatment The final material is pulverized for the first time, so that the particle size of the material is 50...

Embodiment 3

[0031] In the first step, coal char, organic molecules with large л bond conjugated structure, and borax are pulverized separately, so that the particles are pulverized to 240 mesh. The 2nd step, according to parts by weight: 85 parts of coal coke, 28 parts of organic molecules with large л bond conjugated structure, 3 parts of borax are thrown in the mixing batch machine, the rotating speed of adjusting mixing batch machine is 100r / s, mixing batch The time is 3 hours, so that organic molecules with large л bond conjugated structure are evenly bonded on the surface of coal char. The third step is to put the mixed batch of graphite into the vertical reaction kettle, adjust the rotation speed of the reaction kettle to 100r / s, heat in the furnace, and carry out the first roasting treatment at room temperature to 200°C for 6 hours, and the first roasting treatment The final material is pulverized for the first time, so that the particle size of the material is 400 mesh; the reacti...

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Abstract

The invention discloses a method for composite surface modification of lithium-ion battery negative electrode materials. Firstly, three raw materials of oil-based asphalt, modifier and graphitization catalyst are pulverized, then mixed in batches, then graded, heated and pulverized, and then introduced into carbon source graphite. and then passivated to obtain graphene microflakes, which are modified by polyurethane oligomers and SBS to obtain composite modified graphite, and finally the composite modified graphite is covered on the surface of natural graphene to form the following Natural graphene is the inner core, and the outer layer is coated with composite modified graphite as the battery negative electrode material. This surface modification method is low in cost, solves the shortcomings of the existing negative electrode materials such as high cost and uneven coating modification on the surface of the material, and can effectively improve the efficiency and uniformity of the surface modification of the material.

Description

technical field [0001] The invention relates to the technology in the field of battery negative electrode materials, in particular to a composite surface modification method for lithium ion battery negative electrode materials. Background technique [0002] Artificial graphite is currently the main anode material used in the production of lithium-ion batteries in my country. It has a high theoretical lithium intercalation capacity and stable performance, making it an ideal anode material for lithium-ion batteries. However, due to the high orientation of graphite crystals, the kinetic resistance of rapid charge and discharge is relatively large. At the same time, the van der Waals force between graphite layers is weak, and the expansion and contraction during charge and discharge make the cycle performance of graphite not ideal. It can only be used after modification. Contents of the invention [0003] In view of this, the present invention aims at the deficiencies in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
CPCY02E60/10
Inventor 晏荦朱智渊仰韻霖
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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