Preparation method of graphene-sulfide composite negative material

A negative electrode material, graphene technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of capacity decay and large volume change, and achieve the effects of long service life, high cycle stability, and high capacity

Inactive Publication Date: 2013-07-10
詹炳辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of transition metal sulfide has one thing in common: the contained sulfur can undergo a reversible reaction with lithium metal, which provides a reversible capacity, and the transition metal formed by lithium intercalation for

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Graphene oxide is dissolved in deionized water, and ultrasonically dispersed until it is completely dispersed to obtain a uniform solution with a mass concentration of graphene oxide of 0.1 g / ml. Copper nitrate and nickel chloride are mixed in deionized water according to the CuNi stoichiometric ratio to obtain A solution of 0.05mol / L based on the CuNi concentration is added to the uniform graphene oxide solution, and the mixed solution is obtained after stirring evenly, wherein the graphene oxide addition is 5% of the CuNi theoretical weight. %.

[0015] Add reducing agent NaBH in the mixed solution 4 After reacting in a sealed environment at 250°C for 20h, cool down, collect the solid product, alternately and repeatedly wash with deionized water and absolute ethanol, and dry to obtain a transition metal tin oxide / graphene composite material, wherein the addition of the reducing agent The amount is calculated by two parts and determined as follows: add 10 moles of red...

Embodiment 2

[0019] Graphene oxide is dissolved in deionized water, and ultrasonically dispersed until it is completely dispersed to obtain a uniform solution with a mass concentration of graphene oxide of 0.15 g / ml. Copper nitrate and nickel chloride are mixed in deionized water according to the CuNi stoichiometric ratio to obtain A solution of 0.1 mol / L based on the CuNi concentration, then added to the uniform graphene oxide solution, and stirred uniformly to obtain a mixed solution, wherein the added amount of graphene oxide is 10% of the CuNi theoretical weight. %.

[0020] Add reducing agent NaBH in the mixed solution 4 After reacting at 300°C for 10h in a sealed environment, cool down, collect the solid product, alternately and repeatedly wash with deionized water and absolute ethanol, and dry to obtain a transition metal stannide / graphene composite material, wherein the addition of the reducing agent The amount is calculated by two parts and determined as follows: add 15 moles of ...

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Abstract

The invention relates to a preparation method of a graphene-sulfide composite negative material. The preparation method comprises the following steps of: (1) preparing a transition metal tin compound/graphene composite material; (2) dissolving manganese chloride in deionized water, adding transition metal tin compound/graphene composite material to the solution, and fully stirring and dispersing the mixture to obtain a mixed solution; and (3) adding sodium sulfide into the mixed solution, sealing and heating, reacting and cooling to room temperature, collecting a solid product, alternately and repeatedly washing the product with deionized water and ethanol, and drying the washed product to obtain the nickel-based graphene-manganese sulfide composite negative material. According to the nickel-based graphene-manganese sulfide composite negative material for a lithium-ion battery, the manganese sulfide with high specific capacity and the nickel and copper modified graphene material are combined together, so that the negative material has the characteristics of high capacity, high conductivity and high cycle stability.

Description

Technical field [0001] The invention relates to a preparation method of a graphene-sulfide composite negative electrode material. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, and good safety performance. Therefore, they are widely used in portable electronic products such as digital cameras, mobile phones, and notebook computers. They also have application prospects for electric bicycles and electric vehicles. The anode materials of current commercial lithium-ion batteries are graphite and other forms of carbon materials. Since the theoretical capacity of graphite is only 372mAh g -1 , and the lithium intercalation potential is low, which limits its application range. [0003] Compared with carbon materials, some transition metal sulfides have higher theoretical capacity, such as NiS with a theoretical capacity of up to 589mAh g -1 . This type of transition metal sulfide has one thing in common: the...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/58
CPCY02E60/10
Inventor 马军昌
Owner 詹炳辉
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