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Preparation method of copper-silicon composite electrode material

A composite electrode, copper-silicon technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle stability of composite materials, difficulty in suppressing the volume effect of silicon cores, and high preparation costs, and achieve improved cycle stability. The effect of improving the residual capacity and good resistance to rupture

Active Publication Date: 2020-04-21
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the capacity of the silicon-metal composite battery prepared in the prior art has been slightly improved, the capacity advantage of silicon has not been fully utilized, and the preparation cost is relatively high; The structure of the carbon shell is not well maintained, and the carbon shell is difficult to suppress the serious volume effect of the silicon core, and then ruptures, so that the cycle stability of the composite material deteriorates rapidly.

Method used

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  • Preparation method of copper-silicon composite electrode material
  • Preparation method of copper-silicon composite electrode material
  • Preparation method of copper-silicon composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046](1) Disperse 0.5g of SiMPs (average particle size of 1 μm, purity of 99.9%, purchased from Aladdin Reagent Co., Ltd.) into 100mL of deionized water, and ultrasonicate for 30min to make the dispersion uniform.

[0047] (2) Add 1.6mL tris-hydrochloric acid buffer solution (1.0M, pH8.5) and 320mg dopamine hydrochloride to the solution obtained in step (1), stir and react at room temperature for 1h to make dopamine polymerize, and obtain mixture.

[0048] (3) Take 20mL of SnCl 2 Solution (SnCl 2 SnCl in solution 2 The concentration is 5g / L, and also contains 10ml / L HCl aqueous solution) was added to the mixed solution, stirred for 1h.

[0049] (4) Add 30mL PdCl 2 Solution (PdCl 2 PdCl in solution 2 The concentration is 0.5g / L, and also contains 6.25ml / L HCl aqueous solution), stirred for 1h, centrifuged to collect solid particles, and then washed 3 times with deionized water to obtain palladium-coated silicon particles.

[0050] (5) Preparation of CuSO 4 ·5H 2 O sol...

Embodiment 2

[0055] (1) Disperse 0.5g of SiMPs (average particle size of 1 μm, purity of 99.9%, purchased from Aladdin Reagent Co., Ltd.) into 100mL of deionized water, and ultrasonicate for 30min to make the dispersion uniform.

[0056] (2) Add 1.6mL tris-hydrochloric acid buffer solution (1.0M, pH8.5) and 320mg dopamine hydrochloride to the solution obtained in step (1), stir and react at room temperature for 1h to make dopamine polymerize, and obtain mixture.

[0057] (3) Take 20mL of SnCl 2 Solution (SnCl 2 SnCl in solution 2 The concentration is 5g / L, and also contains 10ml / L HCl aqueous solution) was added to the mixed solution, stirred for 1h.

[0058] (4) Add 30mL PdCl 2 Solution (PdCl 2 PdCl in solution 2 The concentration is 0.5g / L, and also contains 6.25ml / L HCl aqueous solution), stirred for 1h, centrifuged to collect solid particles, and then washed 3 times with deionized water to obtain palladium-coated silicon particles.

[0059] (5) Preparation of CuSO 4 ·5H 2 O so...

Embodiment 3

[0064] (1) Disperse 0.5g of SiMPs (average particle size of 1 μm, purity of 99.9%, purchased from Aladdin Reagent Co., Ltd.) into 100mL of deionized water, and ultrasonicate for 30min to make the dispersion uniform.

[0065] (2) Add 1.6mL tris-hydrochloric acid buffer solution (1.0M, pH8.5) and 320mg dopamine hydrochloride to the solution obtained in step (1), stir and react at room temperature for 1h to make dopamine polymerize, and obtain mixture.

[0066] (3) Take 20mL of SnCl 2 Solution (SnCl 2 SnCl in solution 2 The concentration is 5g / L, and also contains 10ml / L HCl aqueous solution) was added to the mixed solution, stirred for 1h.

[0067] (4) Add 30mL PdCl 2 Solution (PdCl 2 PdCl in solution 2 The concentration is 0.5g / L, and also contains 6.25ml / L HCl aqueous solution), stirred for 1h, centrifuged to collect solid particles, and then washed 3 times with deionized water to obtain palladium-coated silicon particles.

[0068] (5) Preparation of CuSO 4 ·5H 2 O so...

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Abstract

The invention relates to a preparation method of a copper-silicon composite electrode material. The preparation method comprises the following steps of uniformly dispersing silicon microparticles in water, adding dopamine hydrochloride, and performing polymerization reaction of dopamine under a condition of pH being 8.5 to obtain a mixed solution; adding a tin salt solution into the mixed solution, performing stirring reaction so that tin ions are attached onto a surface of polydopamine, adding a palladium salt solution, performing stirring reaction so that palladium ions are reduced to metal palladium by the tin ions to obtain palladium coated silicon particles; and preparing a copper salt solution containing a copper salt, a complexing agent and lactic acid, adding a reducing agent and the palladium coated silicon particles into the copper salt solution under a condition of pH being 5-11, and reducing copper ions to copper by the reducing agent under a catalytic effect of the palladium to obtain the copper-silicon composite electrode material. The copper-silicon composite electrode material prepared by the method is expected to substitute a copper current collector in a nanoparticle mode, the mass of a negative electrode is reduced, and the energy density of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of electrode preparation, in particular to a method for preparing a copper-silicon composite electrode material. Background technique [0002] Lithium-ion battery is currently one of the portable chemical power sources with the highest specific energy. Compared with other types of rechargeable batteries, lithium-ion batteries have high energy density, long charge and discharge life, no memory effect, little environmental pollution, and self- Low discharge and other advantages. At present, its application fields are from batteries used in mobile phones, notebook computers, digital cameras, and portable small electrical appliances, and batteries used in submarines, aerospace, and aviation fields, and are gradually moving towards the field of electric vehicle power applications. As the global energy and environment are becoming more and more severe, vehicles have switched to energy storage batteries as the mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/626H01M10/0525H01M2004/021Y02E60/10
Inventor 王小兰徐慧金宏张慧吴世超
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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