Preparation method of graphene-silicon carbon lithium ion battery negative electrode material

A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as low capacity and poor cycle, and achieve stable electrode structure and compaction density High and stable cycle performance

Active Publication Date: 2017-11-10
KEDA (ANHUI) NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple in process, because a lot of nano-silicon is exposed, the capacity is low and the cycle is poor.

Method used

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  • Preparation method of graphene-silicon carbon lithium ion battery negative electrode material
  • Preparation method of graphene-silicon carbon lithium ion battery negative electrode material
  • Preparation method of graphene-silicon carbon lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method for a graphene-silicon carbon lithium ion battery negative electrode material, comprising the steps of:

[0035] 1) Graphene coating of nano-silicon particles: sand-mill micron-level silicon powder, then add graphene solution to continue sand-grinding to obtain graphene-nano-silicon mixture, and then obtain graphene-nano-silicon mixture by spray drying. Nano silicon spherical particles;

[0036] 2) Carbon-coated primary composite material: heat-treat the graphene-nano-silicon spherical particles obtained in step 1), and the heat-treated graphene-silicon nanoparticles are uniformly dispersed in the asphalt, and then the internal uniform dispersion can be obtained by high-temperature reaction Carbon microspheres coated with graphene-silicon nanoparticles;

[0037] 3) Carbonization and mixing: the carbon microspheres obtained in step 2) are carbonized, and then mixed with other carbon materials to obtain a graphene-silicon carbon negative electrode ma...

Embodiment 2

[0046] A preparation method for a graphene-silicon carbon lithium ion battery negative electrode material, comprising the steps of:

[0047] 1) Graphene coating of nano-silicon particles: sand-mill micron-level silicon powder, then add graphene solution to continue sand-grinding to obtain graphene-nano-silicon mixture, and then obtain graphene-nano-silicon mixture by spray drying. Nano silicon spherical particles;

[0048] 2) Carbon-coated primary composite material: heat-treat the graphene-nano-silicon spherical particles obtained in step 1), and the heat-treated graphene-silicon nanoparticles are uniformly dispersed in the asphalt, and then the internal uniform dispersion can be obtained by high-temperature reaction Carbon microspheres with graphene-nano-silicon particles;

[0049] 3) Carbonization and mixing: the carbon microspheres obtained in step 2) are carbonized, and then mixed with other carbon materials to obtain a graphene-silicon carbon negative electrode material...

Embodiment 3

[0057] A preparation method for a graphene-silicon carbon lithium ion battery negative electrode material, comprising the steps of:

[0058] 1) Graphene coating of nano-silicon particles: sand-mill micron-level silicon powder, then add graphene solution to continue sand-grinding to obtain graphene-nano-silicon mixture, and then obtain graphene-nano-silicon mixture by spray drying. Nano silicon spherical particles;

[0059] 2) Carbon-coated primary composite material: heat-treat the graphene-nano-silicon spherical particles obtained in step 1), and the heat-treated graphene-silicon nanoparticles are uniformly dispersed in the asphalt, and then the internal uniform dispersion can be obtained by high-temperature reaction Carbon microspheres with graphene-nano-silicon particles;

[0060] 3) Carbonization and mixing: the carbon microspheres obtained in step 2) are carbonized, and then mixed with other carbon materials to obtain a graphene-silicon carbon negative electrode material...

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Abstract

The invention relates to the technical field of preparation of an electrode material, and specifically relates to a preparation method of a graphene-silicon carbon lithium ion battery negative electrode material. The preparation method comprises the following steps of performing graphene coating on nanometer silicon particles, preparing a carbon coated primary composite material, and performing carbonization and mixing. Nanometer silicon is dispersed into interlayer or surfaces of the graphene sheets to form a spherical-like graphene/nanometer silicon composite material; by virtue of high mechanical performance and flexibility of graphene, deformation stress of silicon can be relieved, and by virtue of excellent conductivity and heat conducting performance, quick electron conduction and heat evacuation can be provided; after heat treatment, the carbon-coated primary composite material can be prepared through growth of carbon microspheres; by virtue of the formed carbon coating layer, direct contact between silicon and an electrolyte caused by the island effect of the silicon particles can be avoided, so that the structural stability and cycling performance of the material can be further improved; and the prepared silicon carbon negative electrode material has the advantages of high initial coulombic efficiency, stable cycling performance, high compaction density and stable electrode structure.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation, in particular to a method for preparing a graphene-silicon carbon lithium ion battery negative electrode material. Background technique [0002] As the industrialization process of emerging economies in the world continues to accelerate, global energy consumption continues to increase, and the depletion of global fossil energy is accelerating. At the same time, the problems of environmental pollution and carbon dioxide emissions are becoming more and more serious, and countries around the world are paying more and more attention to energy conservation and environmental protection. Judging from the trend of energy conservation and emission reduction in the automobile industry, the development of electric vehicles is an inevitable choice for the advancement of automobile technology and industrial upgrading. In recent years, the world's major auto-producing countries have acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 付健梅海龙朱亚锋刘双双冷九够
Owner KEDA (ANHUI) NEW MATERIAL CO LTD
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