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A kind of preparation method of tin alloy/silicon/carbon electrode material

A tin alloy, carbon electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of structural collapse, difficult to effectively control the change of silicon volume, etc., to achieve the effect of convenient operation, conducive to industrial production and simple process

Inactive Publication Date: 2018-01-16
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume of metal tin will also change during the charge-discharge cycle, which will lead to the collapse of the structure, and it is difficult to effectively contain the volume change of silicon during the cycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composition design of a kind of tin alloy / silicon / carbon electrode material is:

[0025] Polyaniline, 0.01mol aniline polymerization product; tetraethyl orthosilicate, 0.03mol; magnesium, 0.08mol; tin-copper alloy (SnCu 2 , particle size <50um), 0.005mol;

[0026] A preparation method of tin alloy / silicon / carbon electrode material: comprising the following steps:

[0027] 1) Weighing a certain mass of polyaniline and ethyl orthosilicate mixed in ethanol, stirring for 5h;

[0028] 2) Slowly add the water-ethanol solution into the mixture in step 1), and control the drop rate of the water-ethanol solution to 1.5ml / min: control the hydrolysis temperature at 40°C; the reaction time is 10h; centrifuge, filter, wash, and dry to obtain polyaniline / Silicon oxide;

[0029] 3) Weighing a certain mass of step 2) The product is mechanically mixed with metallic magnesium, and then thermally reduced in an inert atmosphere at 700°C for 4 hours; the molar ratio of silicon oxide...

Embodiment 2

[0035] The composition design of a kind of tin alloy / silicon / carbon electrode material is:

[0036] Polypyrrole, 0.01mol pyrrole polymerization product; tetraethyl orthosilicate, 0.02mol; magnesium, 0.06mol; tin-silver alloy (SnAg 3 , particle size <50um), 0.003mol;

[0037] A preparation method of tin alloy / silicon / carbon electrode material: comprising the following steps:

[0038] 1) Weighing a certain mass of polypyrrole and ethyl orthosilicate mixed in ethanol, stirring for 5h;

[0039] 2) Slowly drop water ethylene glycol solution into the product of step 1), and control the water ethanol solution drop rate to 1ml / min: control the hydrolysis temperature to 50°C; the reaction time is 5h; centrifuge, filter, wash, and dry to obtain polyaniline / silicon oxide;

[0040] 3) Weighing a certain mass of step 2) The product is mechanically mixed with metallic magnesium, and then thermally reduced at 660° C. for 6 hours in an inert atmosphere; the molar ratio of silicon oxide t...

Embodiment 3

[0046] The composition design of a kind of tin alloy / silicon / carbon electrode material is:

[0047] Polyacrylonitrile, 0.01mol acrylonitrile polymerization product; silicon tetrachloride, 0.01mol; magnesium, 0.03mol; tin-nickel alloy (SnNi 3 , particle size <50um), 0.005mol;

[0048] Polyacetylene, 0.01mol acetylene polymerization product; trichlorosilane, 0.01mol; magnesium, 0.02mol; tin-iron alloy (SnFe, particle size <50um), 0.005mol;

[0049] A kind of implementation step of tin alloy / silicon / carbon electrode material is the same as embodiment 1,

[0050] Preparation and performance testing of the negative electrode; the nickel-tin-carbon-silicon electrode material is used as the positive electrode, lithium metal is used as the negative electrode, and 1mol / L LiPF6 is dissolved in EC:DMC:EMC (1:1:1)+5%FEC as the electrolyte, CELGARD 2400 is used as the separator to assemble coin cells. The Land battery test system is used for constant current charge and discharge tests. ...

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Abstract

The invention relates to a preparation method of a tin alloy / silicon / carbon electrode material. The method comprises the following steps: with a porous polymer as a carrier, depositing silicon oxide; mechanically mixing magnesium; carrying out high-temperature thermal reduction and acid treatment; filtering and drying the mixture; mechanically mixing a tin alloy; tabletting the mixture; and carrying out high-temperature sintering to obtain the tin alloy / silicon / carbon electrode material. The porous polymer is one of polyacetylene, polyacrylonitrile, polyaniline, polypyrrole and phenolic resin; the tin alloy is one of a nickel-tin alloy, a copper-tin alloy, an iron-tin alloy and a silver-tin alloy; the silicon source is one of tetraethoxysilane, silicon tetrachloride and trichlorosilane; an inner layer of the tin alloy / silicon / carbon electrode material is carbon and silicon in a porous structure; and an outer layer is the tin alloy with good conductivity and stable structure. The electrode material has the advantages of high specific capacity and long cycle lifetime, and has a good application prospect in the field of batteries.

Description

technical field [0001] The invention relates to a preparation method of an electrode material, in particular to a preparation method of a tin alloy / silicon / carbon electrode material. Background technique [0002] Lithium-ion battery anode materials are one of the decisive factors that affect the electrochemical performance, safety, and cost of the entire battery. Graphite, a negative electrode material for commercial lithium-ion batteries, has a theoretical capacity of 372mAh / g, which is difficult to meet the needs of future large-capacity, high-power, and low-cost chemical power sources. Silicon anode material has a theoretical lithium storage capacity (4200mAh / g) and abundant reserves. It is a very promising anode material for next-generation lithium-ion batteries. However, the volume of the silicon negative electrode material changes greatly during the charging and discharging process (volume expansion is about 400%), which leads to the electrode material cracking, pulve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525
CPCH01M4/366H01M4/386H01M4/387H01M4/587H01M10/0525Y02E60/10
Inventor 黄丽艳范美强柴源王凌鹏葛森周戬尹号
Owner CHINA JILIANG UNIV
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