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A kind of preparation method of lithium battery cathode material

A positive electrode material, lithium battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as inability to meet application requirements, and achieve the promotion of transmission and diffusion, phase interface Stable and good dispersion effect

Active Publication Date: 2021-12-07
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing commercial lithium-ion batteries use LiCoO 2 The material is the positive electrode (specific capacity <140mAh / g), and its energy density is only about 300Wh / kg, which cannot meet the application requirements

Method used

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  • A kind of preparation method of lithium battery cathode material
  • A kind of preparation method of lithium battery cathode material
  • A kind of preparation method of lithium battery cathode material

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preparation example Construction

[0032] A kind of preparation method of lithium battery cathode material of the present invention, specifically implement according to the following steps:

[0033] Step 1, prepare ammonium fluoride solution

[0034] Step 1 specifically includes adding ammonium fluoride to deionized water and stirring until the ammonium fluoride is completely dissolved to obtain a 2 mol / L ammonium fluoride solution.

[0035] Step 2, prepare nitrate graphene / ethanol mixed solution

[0036] Step 2.1, using an ultrasonic dissolving instrument to ultrasonically dissolve the expanded graphite in ethanol, the time for ultrasonic dissolution is 2.8h to 4h to obtain a graphene / ethanol solution, the mass ratio of expanded graphite to ethanol is 789:1;

[0037] Step 2.2, add cobalt nitrate and nickel nitrate respectively to the graphene / ethanol solution, and stir until cobalt nitrate and nickel nitrate are completely dissolved to obtain the primary nitrate graphene / ethanol mixed solution, the sum of the...

Embodiment 1

[0047] This embodiment provides a preparation method of a lithium battery positive electrode material according to the present invention, which is specifically implemented according to the following steps:

[0048] Step 1, prepare ammonium fluoride solution

[0049] Step 1 specifically includes adding 0.04 mol of ammonium fluoride to 20 ml of deionized water and stirring with a magnetic stirrer until the ammonium fluoride is completely dissolved to obtain a 2 mol / L ammonium fluoride solution.

[0050] Step 2, prepare nitrate graphene / ethanol mixed solution

[0051] Step 2.1, utilize ultrasonic dissolving instrument to ultrasonically dissolve 20mg expanded graphite in 20ml ethanol, the time of ultrasonic dissolution is 3h, obtain graphene / ethanol solution, the mass ratio of expanded graphite and ethanol is 789:1;

[0052] Step 2.2, add 0.01mol cobalt nitrate hexahydrate and 0.01mol nickel nitrate hexahydrate respectively to the graphene / ethanol solution, and stir with a magnet...

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Abstract

The invention discloses a preparation method of a positive electrode material of a lithium battery, which is specifically implemented according to the following steps: step 1, preparing an ammonium fluoride solution; step 2, preparing a nitrate graphene / ethanol mixed solution; step 3, preparing the ammonium fluoride solution Added to the nitrate graphene / ethanol mixed solution, centrifuged and dried to obtain Ni 0.5 co 0.5 f 2 / Graphene composite material, that is, the cathode material of lithium battery. The present invention is simple and efficient to operate Ni produced by the present invention 0.5 co 0.5 f 2 / The size of nickel-cobalt fluoride nanoparticles in graphene composites is small, which can reach below 40nm; at the same time, the dispersion of nickel-cobalt fluoride nanoparticles on the surface of graphene is good, which can effectively improve the electron mobility of nickel-cobalt fluoride .

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a preparation method of a positive electrode material of a lithium battery. Background technique [0002] In the past few decades, lithium-ion battery technology has developed rapidly and has gradually been widely used in mobile electronic devices such as mobile phones, computers, digital cameras or handheld electronic products. Lithium-ion is embedded to work. Compared with other batteries, lithium-ion has high energy density, low battery cost, safety and pollution-free and long service life. However, with the vigorous development of electric hybrid vehicles, large power grids, etc., higher requirements are placed on the energy density of batteries. Most of the existing commercial lithium-ion batteries use LiCoO 2 The material is a positive electrode (specific capacity <140mAh / g), and its energy density is only about 300Wh / kg, which cannot meet the application r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/582H01M4/625H01M10/0525Y02E60/10
Inventor 刘和光游才印赵娜娜
Owner XIAN UNIV OF TECH