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Preparation method of lithium ion battery negative electrode material

A technology of lithium-ion batteries and negative electrode materials, applied in the field of solar cells, can solve the problems that the conduction and buffering effects of carbon materials cannot be fully exerted, uniform silicon particle materials cannot be obtained, and the electrochemical performance of materials is affected, so as to reduce volume expansion, The preparation method is simple and the production yield is high

Active Publication Date: 2018-03-06
XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation of this composite material, since the silicon raw material used is silicon particles, uniform and small-sized silicon particle materials cannot be obtained simply by ball milling; carbon materials and silicon cannot be composited in the nanoscale range, and the conductivity and The buffering effect cannot be fully exerted, which affects the electrochemical performance of the material

Method used

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  • Preparation method of lithium ion battery negative electrode material
  • Preparation method of lithium ion battery negative electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] refer to figure 1 Shown is a preparation method of lithium ion battery negative electrode material, and its preparation method comprises the steps:

[0025] S01, growing nano-silicon spheres on the surface of graphene to form a graphene / nano-silicon composite material;

[0026] S02, the graphene / nano-silicon composite material is coated with sugar;

[0027] S03, carbonizing the graphene / nano-silicon composite material after the sugar coating treatment to form a carbon / graphene / nano-silicon sphere composite material.

[0028] Such as figure 2 As shown, the carbon / graphene / nano-silicon sphere composite material of the present invention includes nano-silicon spheres 2 grown on the surface of graphene 1 and the outermost carbon coating 3, because the nano-silicon spheres 2 are small in size and uniformly distributed on graphite At the same time, the graphene 1 and the carbon coating layer 3 play a dual role in protecting the nano-silicon spheres 2, which can effectively...

Embodiment 2

[0031] refer to figure 1 Shown is a preparation method of lithium ion battery negative electrode material, and its preparation method comprises the steps:

[0032] S01, grow nano-silicon spheres on the surface of graphene, put graphene powder into the HTCVD reaction chamber, evacuate and heat the reaction chamber, and when the temperature reaches 850°C, 150 sccm of argon gas is introduced to increase the pressure of the reaction chamber Keep it at about 1.2Torr, then feed 13sccm of silane (SiH 4 ), SiH 4 Decomposition reaction at high temperature generates nano-silicon spheres with a size of about 8nm and attaches to the surface of graphene to form a graphene / nano-silicon composite material;

[0033] S02, the graphene / nano-silicon composite material is coated with sugar, and the graphene / nano-silicon sphere composite material is immersed in the syrup in a molten state, so that the surface of the graphene / nano-silicon sphere composite material is completely covered by the syr...

Embodiment 3

[0036] refer to figure 1 Shown is a preparation method of lithium ion battery negative electrode material, and its preparation method comprises the steps:

[0037] S01, grow nano-silicon spheres on the surface of graphene, put graphene powder into the HTCVD reaction chamber, evacuate and heat the reaction chamber, and when the temperature reaches 850°C, 200 sccm of argon gas is introduced to increase the pressure of the reaction chamber Keep it at about 2Torr, then feed 30sccm of dichlorosilane (SiH 2 Cl 2 ), SiH 2 Cl 2 Decomposition reaction at high temperature generates nano-silicon spheres with a size of about 25nm attached to the surface of graphene;

[0038] S02, the graphene / nano-silicon composite material is coated with sugar, and the graphene / nano-silicon sphere composite material is immersed in the syrup in a molten state, so that the surface of the graphene / nano-silicon sphere composite material is completely covered by the syrup;

[0039] S03, carbonize the gra...

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Abstract

The invention discloses a preparation method of a lithium ion battery negative electrode material. The preparation method comprises the following steps of growing a nanometer silicon sphere on a surface of graphene; forming a graphene / nanometer silicon composite material; performing sugar coating on the graphene / nanometer silicon composite material; and carbonizing the graphene / nanometer silicon composite material subjected to sugar coating to form a carbon / graphene / nanometer silicon composite material. The preparation method is simple and high in production yield, the nanometer silicon sphereis small and uniform in size, the volume expansion of silicon caused by lithium intercalation and de-intercalation during the charge-discharging process can be effectively reduced by combining the nanometer silicon sphere and the graphene, the internal stress of an electrode is reduced, and the silicon sphere is prevented from being excessively expanded and damaged.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing a negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, high specific energy, no memory effect, long cycle life, and no environmental pollution. They are currently the most widely used rechargeable mobile power sources. Lithium-ion battery anode materials are the core of current lithium-ion battery research. The anode materials of commercial lithium-ion batteries are mostly graphite materials. Graphite has a crystalline layered structure, which is easy for lithium ions to intercalate and deintercalate, forming an interlayer compound LiC6, which is a stable negative electrode material. However, the theoretical specific capacity of graphite negative electrode is only 372mAh / g, which limits the further development of lithium-ion batteries. [0003] Silicon-base...

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
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M4/36Y02E60/10
Inventor 许志
Owner XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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