Lithium battery negative electrode material with layered structure and preparation method thereof

A layered structure and negative electrode material technology, applied in battery electrodes, lithium batteries, structural parts, etc., can solve the problems of large volume expansion, etc., and achieve the effects of improving heat resistance, improving heat resistance, and simple preparation methods

Active Publication Date: 2017-01-18
安徽益佳通电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is first to solve the problem of large volume expansion of metal tin after high-temperature heat treatment and to improve the cycle performance of tin-carbon composite materials, and to provide a negative electrode material for lithium batteries with a layered structure

Method used

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  • Lithium battery negative electrode material with layered structure and preparation method thereof
  • Lithium battery negative electrode material with layered structure and preparation method thereof
  • Lithium battery negative electrode material with layered structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Self-made layered graphene: use flake graphite as a carbon source, exfoliate flake graphite into graphene and add functional groups to such graphene to obtain the desired layered graphene. According to Hummer's method, add flake graphite to the mixture of concentrated sulfuric acid, potassium permanganate and sodium nitrate and mix well. Put the three-neck flask containing the mixed solution in an ice bath and stir for 1h~3h, then stir for 1h~3h at 30°C~50°C, and finally add 10%~20% of the prepared mass fraction to the mixed solution % hydrogen peroxide, stirred and reacted at 90°C~100°C for 4h~6h. This treatment mainly increases some oxygen-containing groups such as -OH, -C=O. See the SEM photos of self-made layered graphene figure 1 . from the figure 1 It can be seen that the self-made layered graphene has an obvious sheet structure, and the surface area of ​​graphene increases, and substances can be deposited into the gaps of the sheets.

Embodiment 2

[0036] Weigh 5g of self-made layered graphene and place it in 150ml of 1% palladium chloride solution, heat to 55°C and stir magnetically for 30min, then add 15g / L 30ml of sodium hypophosphite, stir magnetically for 30min, wash and dry dry to obtain activated graphene. 4g of activated graphene was added to 12g / L 300ml nickel sulfate plating solution, ultrasonically reacted at 80°C for 1 hour, washed and dried to obtain a nickel-plated sample. The SEM photograph of the sample is shown in figure 2 . from the figure 2 It is obvious that flocculent particles are deposited on the graphene.

[0037] Weigh 3g of nickel plating sample and add it to 15g / L 300ml stannous chloride plating solution, ultrasonically react at 80°C for 1 hour, wash and dry to obtain Sn-Ni-graphene composite material. The SEM photograph of the material is shown in Figure 5 . from Figure 5 It is obvious that after electroless nickel plating and electroless tin plating, tiny flocculent particles exist...

Embodiment 3

[0047] Weigh 5g of self-made layered graphene and place it in 150ml of 1% palladium chloride solution, heat to 70°C and stir magnetically for 30min, then add 15g / L 30ml of sodium hypophosphite, stir magnetically for 30min, wash and dry , to obtain activated graphene. 4g of activated graphene was added to 12g / L 300ml nickel sulfate plating solution, ultrasonically reacted at 80°C for 1 hour, washed and dried to obtain a nickel-plated sample. Weigh 3g of nickel-plated sample and add it to 15g / L 300ml stannous chloride plating solution, ultrasonically react at 80°C for 1 hour, wash and dry to obtain Sn-Ni-graphene composite material. Put 1g of Sn-Ni-graphene composite material in a burning boat and put it into a quartz tube furnace. Ar was introduced as a protective gas, the gas flow rate was 200ml / min, the temperature was raised from room temperature to 600 °C at a rate of 3 °C / min, kept for 2 hours, and then naturally cooled to room temperature to obtain a calcined product.

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Abstract

The invention provides a lithium battery negative electrode material with a lamellar structure. A nickel layer is deposited on lamellar graphene and then a tin layer is deposited on the surface of the nickel layer to form a Sn-Ni-graphene composite material; the tin particle size of the tin layer of the material ranges from 90 to 110nm, and the mass fractions of tin, nickel, oxygen and carbon in the material are 4%-12%, 5%-10%, 30%-50% and 40%-50% respectively. The composite material has the advantages that the metal tin is prevented from huge agglomeration after high-temperature heat treatment, the volume expansion and shrinkage of the metal tin are inhibited, and the particle size of the composite material which is thermally treated at a relatively high temperature is obviously smaller than the particle size of an independently tin-coated Sn-graphene composite material. When the composite material is used as a lithium-ion battery negative electrode, the composite material shows excellent cyclic performance. The invention also relates to a preparation method of the material.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a lithium battery negative electrode material, more specifically to a layered lithium battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products (such as notebook computers, mobile phones, digital cameras, etc.) because of their advantages such as high energy density, environmental friendliness, and no memory effect, and have been widely used in electric vehicles and hybrid vehicles. Huge potential application prospects. With the development of society and the advancement of science and technology, people's demand for high-performance secondary batteries is becoming increasingly urgent. However, the theoretical specific capacity of graphite, the anode material of current commercial lithium-ion batteries, is only 372mAh / g, which cannot meet the requirements of high-capacity pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/364H01M4/38H01M10/052Y02E60/10
Inventor 李庆余王红强杨观华颜志雄黄有国
Owner 安徽益佳通电池有限公司
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