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Preparation method and application of a lithium-ion battery negative electrode material based on photovoltaic silicon waste

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor electronic conductivity, and achieve the effects of improving electronic conductivity, low price, and improving cycle performance.

Active Publication Date: 2018-09-07
江苏载驰科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is mainly aimed at bottlenecks such as the poor electronic conductivity of micron or submicron silicon materials and the severe volume effect in the cycle process. The low-cost photovoltaic silicon cutting waste is selected as the source of silicon materials, and through technological innovation, it is used for high performance. Lithium-ion battery negative electrode

Method used

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  • Preparation method and application of a lithium-ion battery negative electrode material based on photovoltaic silicon waste
  • Preparation method and application of a lithium-ion battery negative electrode material based on photovoltaic silicon waste
  • Preparation method and application of a lithium-ion battery negative electrode material based on photovoltaic silicon waste

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Weigh 500g of photovoltaic silicon waste (average particle size is 1 micron), first pass through dilute HCl and dilute HNO 3 were washed three times, and then placed in H 2 SO 4 +H 2 o 2 (3:1) to 100°C and hold for 3 hours. The samples after surface oxidation were washed three times with deionized water, ethanol and acetone respectively. After the cleaned materials are dried in an air environment of 100 degrees, they are placed in a tube furnace and heated at 600 degrees under an inert atmosphere for 3 hours to completely carbonize the residual organic matter on the surface.

[0037] (2) Weigh 100g of pre-treated photovoltaic silicon material, then weigh 1g of glucose and 1g of ferric nitrate, and grind the mixture of the three until uniformly dispersed; uniformly disperse the above mixture in a crucible or a porcelain boat, and place In the center of a closed tube furnace, the reaction is carried out in a mixed gas of argon and hydrogen, and the temperature i...

Embodiment 2

[0042] (1) Weigh 1000g of photovoltaic silicon waste (average particle size is 5 microns), first pass through dilute HCl and dilute HNO 3 Wash three times respectively, then place in concentrated nitric acid and heat to 120 degrees, and keep it for 1 hour. The samples after surface oxidation were washed three times with deionized water, ethanol and acetone respectively. After the cleaned materials are dried in an air environment of 200 degrees, they are placed in a tube furnace and heated at 800 degrees under an inert atmosphere for 6 hours to completely carbonize the residual organic matter on the surface.

[0043] (2) Weigh 200g of pre-treated photovoltaic silicon material, then weigh 10 g of sucrose and 2 g of nickel nitrate, and grind the mixture of the three until uniformly dispersed; uniformly disperse the above mixture in a crucible or a porcelain boat, and Placed in the center of a closed tube furnace, the reaction was carried out in a mixed gas of argon and hydrogen,...

Embodiment 3

[0048] (1) Weigh 1000g photovoltaic silicon waste (average particle size is 2 microns), first pass through dilute HCl and dilute HNO 3Wash three times respectively, then place in potassium dichromate solution and heat to 90 degrees, and keep it for 1 hour. The samples after surface oxidation were washed three times with deionized water, ethanol and acetone respectively. After the cleaned materials are dried in an air environment of 200 degrees, they are placed in a tube furnace and heated at 800 degrees under an inert atmosphere for 6 hours to completely carbonize the residual organic matter on the surface.

[0049] (2) Weigh 500g of pre-treated photovoltaic silicon material, then weigh 5 g of polymethyl methacrylate and 2.5 g of cobalt acetate, and grind the mixture of the three until uniformly dispersed; uniformly disperse the above mixture in a crucible or In a porcelain boat and placed in the center of a closed tube furnace, the reaction is carried out in a mixed gas of a...

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Abstract

The invention provides a preparation method and an application technology for a lithium ion battery negative electrode material based on a photovoltaic silicon waste material. By performing serial purification (including cleaning, high temperature impurity-removing and the like) on high-purity silicon waste material generated by cutting silicon wafers in the photovoltaic industry, and by performing regulation and control (including wet etching, in-situ graphite carbon coating and mixing with conventional graphite negative electrode based on a certain proportion) on the structure and composition, a micro or submicro silicon or silicon-graphite mixing material is obtained; then by developing a three-dimensional high-strength binder system and optimizing an electrode processing technology, the strong volume effect of the silicon material being used as the lithium ion negative electrode material in the charging / discharging processes is reduced to enable the silicon material to achieve the demand on the service life of the negative electrode material by the lithium ion battery; the silicon material can be assembled with the corresponding positive electrode material to form a whole battery with high specific energy; and in addition, the high cost of the existing silicon negative electrode material can be reduced greatly, and the efficient recycling utilization of the photovoltaic silicon waste material can be realized as well, so that the preparation method and the application technology are quite high in the economic and social value.

Description

technical field [0001] The invention relates to a preparation method and application technology of a lithium-ion battery negative electrode material based on high-purity silicon waste in the photovoltaic industry, and belongs to the field of new energy materials and energy electrochemistry research. Background technique [0002] Lithium-ion batteries have been used with great success in mobile electronics over the past two decades and are considered ideal for battery systems in electric vehicles and large energy storage devices. However, in order to achieve further applications in the field of power and energy storage, the next generation of lithium-ion batteries still needs to be systematically improved and optimized in terms of energy and power density, safety, life, and cost. [0003] The development and application of positive and negative electrode materials with high specific capacity is one of the most effective and important ways to develop high specific energy lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395
CPCY02E60/10
Inventor 张力
Owner 江苏载驰科技股份有限公司
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