Preparation method of nickel hydroxide-graphene composite lithium battery material

A graphene composite and lithium battery material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of battery life reduction, electrode active material activity decline, etc., and achieve short crystallization time, fast reaction rate, and high yield Effect

Inactive Publication Date: 2018-12-11
AOYANG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these prior art schemes do not solve how to make Ni(OH) 2 The problem of uniform deposition on graphene sheets, Ni(OH) during fast charge and discharge 2 The effect of volume expansion is obvious, resulting in a decrease in the activity of the electrode active material and a decrease in battery life.

Method used

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Examples

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preparation example Construction

[0018] The invention discloses a method for preparing a nickel hydroxide-graphene composite lithium battery material, comprising:

[0019] (1) adding graphene oxide into deionized water, and ultrasonically dispersing for 1-2 hours to obtain a graphene oxide suspension with a concentration of 0.5-1.5 mg / mL;

[0020] (2) Add nickel nitrate solution to the above-mentioned graphene oxide suspension, stir evenly, then add mixed lye in the mode of stirring while adding dropwise, the temperature of water bath control reaction is 50~60 ℃, wherein, described mixed lye The dropping rate of the liquid is 1-2 drops per second, after the reaction is completed, let stand to obtain a mixture containing nickel hydroxide;

[0021] (3) take the nickel hydroxide that above-mentioned generation is as crystal seed, continue to drip mixed lye, stop reaction when the particle size of nickel hydroxide reaches requirement, vacuum suction filtration, wash to neutrality with deionized water and dehydrat...

Embodiment 1

[0028] (1) adding graphene oxide into deionized water, and ultrasonically dispersing it for 1 hour to obtain a graphene oxide suspension with a concentration of 0.5 mg / mL;

[0029] (2) Add 1mol / L nickel nitrate solution to the above-mentioned graphene oxide suspension, stir evenly, then add the mixed lye that the volume ratio is 1:1 sodium hydroxide and ammoniacal liquor in the mode of adding while stirring, The water bath controls the temperature of the reaction to be 50°C, wherein the dropping rate of the mixed lye is 1 to 2 drops per second, after the reaction is completed, it is left to stand to obtain a mixture containing nickel hydroxide;

[0030] (3) take the nickel hydroxide that above-mentioned generation is as crystal seed, continue to drip mixed lye, stop reaction when the particle size of nickel hydroxide reaches requirement, vacuum suction filtration, wash to neutrality with deionized water and dehydrated alcohol, Vacuum drying at 80° C. for 12 hours to obtain a n...

Embodiment 2

[0033] (1) adding graphene oxide into deionized water, and ultrasonically dispersing for 1.5h to obtain a graphene oxide suspension with a concentration of 1 mg / mL;

[0034] (2) Add 2mol / L nickel nitrate solution to the above-mentioned graphene oxide suspension, stir evenly, then add the mixed lye that the volume ratio is 2:1 sodium hydroxide and ammoniacal liquor in the mode of adding while stirring, The temperature of the reaction controlled by the water bath is 55° C., wherein the dropping rate of the mixed lye is 1 to 2 drops per second, after the reaction is completed, the mixture is left standing to obtain a mixture containing nickel hydroxide;

[0035] (3) take the nickel hydroxide that above-mentioned generation is as crystal seed, continue to drip mixed lye, stop reaction when the particle size of nickel hydroxide reaches requirement, vacuum suction filtration, wash to neutrality with deionized water and dehydrated alcohol, Vacuum drying at 80° C. for 12 hours to obta...

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Abstract

The invention discloses a preparation method of nickel hydroxide-graphene composite lithium battery material. The preparation method comprises the following steps: (1) adding graphene oxide into deionized water, ultrasonic dispersing for 1-2h to obtain 0.5-1.5 mg / mL graphene oxide suspension; (2) adding nickel nitrate solution into the graphene oxide suspension, stirring uniformly, adding mixed alkali solution while stirring, controlling the temperature of the reaction in a water bath to be 50-60 DEG C, wherein the dripping acceleration of the mixed alkali solution is 1-2 drops per second, andstanding after the reaction is finished to obtain a mixture containing nickel hydroxide; (3) taking the generated nickel hydroxide as crystal seed, dropping the mixed alkaline solution, stopping thereaction when the particle size of the nickel hydroxide reaches the requirement, vacuum pumping and filtering, washing with deionized water and absolute ethanol to neutrality, and vacuum drying to obtain nickel hydroxide-graphene composite lithium battery material. The method has the advantages of high reaction rate, uniform heating, short crystallization time and high yield.

Description

technical field [0001] The invention relates to the technical field of battery electrode materials, in particular to a preparation method of a nickel hydroxide-graphene composite lithium battery material. Background technique [0002] Ni-MH batteries have the characteristics of high specific power, large current charge and discharge, no pollution, and good safety performance. The disadvantage is that it has a mild memory effect and poor performance in high temperature environments. However, due to its mature technology and good overall performance, it is the current hybrid battery. The most mature green battery used in automobiles. However, with the popularity of pure electric vehicles, the requirements for the power performance of nickel-metal hydride batteries are getting higher and higher, and the improvement of its power performance has become the focus of more and more researchers. Ni(OH) 2 Due to its excellent electrochemical properties, it has been widely used as th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62
CPCH01M4/362H01M4/52H01M4/625Y02E60/10
Inventor 沈学如
Owner AOYANG GRP CO LTD
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