Preparation method of graphene-coated micron silicon with core-shell structure

A graphene-coated, core-shell structure technology, applied in the direction of structural parts, active material electrodes, electrical components, etc., can solve the problems of poor power performance, low initial efficiency, large volume expansion, etc., to avoid continuous contact and low price , the effect of improving conductivity

Inactive Publication Date: 2018-11-23
DONGGUAN TAFEL NEW ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to: address the deficiencies of the prior art, and provide a core-shell structure graphene-coated micro-silicon preparation method to solve the problem of low efficiency, huge volume expansion and poor power performance when silicon is used in negative electrode materials for the first time The problem

Method used

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  • Preparation method of graphene-coated micron silicon with core-shell structure
  • Preparation method of graphene-coated micron silicon with core-shell structure
  • Preparation method of graphene-coated micron silicon with core-shell structure

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Embodiment 1

[0034] The present embodiment provides a kind of preparation method of core-shell structure graphene coating micron silicon, comprises the following steps:

[0035] Step 1, growing SiO on the surface of micron silicon 2 layer, resulting in SiO 2 Composite material coated with micron silicon, the specific operation is as follows:

[0036] 1) Take 28g of silicon particles and disperse them in 1000g of deionized water, and stir them mechanically for 20min to form an aqueous solution containing silicon powder;

[0037] 2) Take 10g Na 2 SiO 3 Dissolve in an aqueous solution containing silicon powder, heat it in a water bath at 85°C, and then slowly introduce CO while stirring 2 Gas, control the flow rate of the gas to 8m / s, react for 60min, and coat a uniform layer of SiO on the surface of micron silicon 2 layer;

[0038] 3) step 2) gained solution is carried out suction filtration, obtains filtrate, removes Na with deionized water cleaning then 2 SiO 3 , and SiO was obtain...

Embodiment 2

[0043] The present embodiment provides a kind of preparation method of core-shell structure graphene coating micron silicon, comprises the following steps:

[0044] Step 1, growing SiO on the surface of micron silicon 2 layer, resulting in SiO 2 Composite material coated with micron silicon, the specific operation is as follows:

[0045] 1) Take 20g of silicon particles and disperse them in 1000g of deionized water, and stir them mechanically for 10min to form an aqueous solution containing silicon powder;

[0046] 2) Take 10g Na 2 SiO 3Dissolve in an aqueous solution containing silicon powder, heat it in a water bath at 70°C, and then slowly introduce CO while stirring 2 Gas, control the flow rate of the gas to 10m / s, react for 45min, and coat a uniform layer of SiO on the surface of micron silicon 2 layer;

[0047] 3) step 2) gained solution is carried out suction filtration, obtains filtrate, removes Na with deionized water cleaning then 2 SiO 3 , and SiO was obtain...

Embodiment 3

[0052] The present embodiment provides a kind of preparation method of core-shell structure graphene coating micron silicon, comprises the following steps:

[0053] Step 1, growing SiO on the surface of micron silicon 2 layer, resulting in SiO 2 Composite material coated with micron silicon, the specific operation is as follows:

[0054] 1) Take 32g of silicon particles and disperse them in 1000g of deionized water, and stir them mechanically for 30min to form an aqueous solution containing silicon powder;

[0055] 2) Take 12g Na 2 SiO 3 Dissolve it in an aqueous solution containing silicon powder, heat it in a water bath at 100°C, and then slowly introduce CO while stirring 2 Gas, control the flow rate of the gas to 5m / s, react for 90min, and coat a uniform layer of SiO on the surface of micron silicon 2 layer;

[0056] 3) step 2) gained solution is carried out suction filtration, obtains filtrate, removes Na with deionized water cleaning then 2 SiO 3 , and SiO was ob...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, in particular to a preparation method of graphene-coated micron silicon with a core-shell structure. The method comprisesthe following steps: step 1, generating a composite material with micron silicon uniformly coated with SiO2; step 2, obtaining SiO2 / micron silicon / graphene oxide; step 3, obtaining a graphene-coated SiO2 / micron silicon material; and step 4, obtaining the graphene-coated micron silicon material with the core-shell structure. Compared with the prior art, the preparation process of the graphene-coated micron silicon with the core-shell structure is simple, the cost is low, and batch production is easy to realize; According to the graphene-coated micron silicon with the core-shell structureobtained by the preparation method, the deterioration of cycle performance caused by crystal powdering due to expansion and contraction of silicon during a circulation process can be reduced, and thecoulombic efficiency of the battery is improved. In addition, the graphene has excellent electrical conductivity, so that a good surface contact conductive network can be formed, and the power performance of the battery is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a preparation method of core-shell structure graphene-coated micro-silicon. Background technique [0002] At present, the energy density of commercial power single cells is 170-200Wh / kg, and the energy density of power battery modules reaching 300Wh / kg is the development goal of power batteries in the next stage in this field, so the weight energy density of power cells should be increased It is imperative. [0003] The current commercial power cell anode materials are mainly graphite-based anode materials, but their energy density is only 372mAh / g, which can no longer meet the industry's demand for power cell energy density. Therefore, the development of new anode materials with high specific capacity, high power capability and long cycle life has become a current research hotspot. [0004] When silicon is used as a negative electrode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵阳雨袁威杜可姜斌
Owner DONGGUAN TAFEL NEW ENERGY TECH CO LTD
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