A kind of nickel oxide and microcrystalline graphite composite and its preparation method and application

A technology of microcrystalline graphite and nickel oxide, which is applied in the direction of graphite, structural parts, electrical components, etc., can solve the problems of poor electrochemical performance, poor conductivity and stability, and fast capacity decay of materials, and achieve low raw material costs and improved The effect of conductivity and simple equipment

Active Publication Date: 2020-08-11
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar to other transition metal oxides, nickel oxide has poor conductivity and stability, and its volume changes greatly during charge and discharge, resulting in poor electrochemical performance and rapid capacity decay of the material.

Method used

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  • A kind of nickel oxide and microcrystalline graphite composite and its preparation method and application
  • A kind of nickel oxide and microcrystalline graphite composite and its preparation method and application
  • A kind of nickel oxide and microcrystalline graphite composite and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1. Dissolve 1g of polyacrylonitrile in 9g of N,N-dimethylformamide (DMF), keep stirring at 75°C for 3 hours, and then stir at room temperature for 12 hours to form a viscous transparent solution. spinning solution. The prepared spinning solution was prepared by electrospinning equipment to prepare PAN nanofibers, and transferred to a high-temperature tube furnace for pre-oxidation reaction in an air atmosphere at 250 °C for 2 hours, and then at 700 °C under N 2 Atmosphere carbonization was carried out for 3 hours to obtain a carbon nanofiber film.

[0040] Step 2. Dissolve nickel acetate and NaOH in deionized water sequentially under stirring, and stir for 30 minutes to obtain a nickel salt solution, wherein the final concentration of nickel salt is 0.3 mol / L, and the final concentration of NaOH is 0.5 mol / L. Weigh the carbon nanofiber film obtained in step 1 according to 2% of the theoretically generated mass of NiO, and add it into the nickel salt solution to ob...

Embodiment 2

[0043] Step 1. Prepare a carbon nanofiber membrane according to the method in Example 1 for future use.

[0044] Step 2. Under stirring, 2.3g of nickel nitrate and 0.5g of NaOH were dissolved in 60mL of deionized water in turn, and stirred for 30min to obtain a nickel salt solution. The carbon nanofiber film was weighed according to 3% of the theoretically generated mass of NiO and added to the nickel salt solution to obtain a green suspension. The green suspension was transferred into a Teflon autoclave and hydrothermally treated at 200 °C for 8 h. After the reaction, the obtained sample was washed several times with deionized water and ethanol to completely remove nickel ions and sodium ions in the reactant. The precipitate was dried at 70 °C, and at 500 °C in N 2 Treated in the atmosphere for 2 hours (heating rate 4°C·min -1 ), after the reaction was completed, the furnace was cooled to obtain a composite of nickel oxide and microcrystalline graphite. The X-ray diffract...

Embodiment 3

[0047] Step 1. Prepare a carbon nanofiber membrane according to the method in Example 1 for future use.

[0048] Step 2. Dissolve nickel sulfate and NaOH in deionized water sequentially under stirring, and stir for 30 minutes to obtain a nickel salt solution, wherein the final concentration of nickel salt is 0.2 mol / L, and the final concentration of NaOH is 0.4 mol / L. Weigh the carbon nanofiber film obtained in step 1 according to 6% of the theoretically generated mass of NiO, and add it into the nickel salt solution to obtain a green suspension. The green suspension was transferred into a Teflon autoclave and hydrothermally treated at 200 °C for 12 h. After the reaction, the obtained sample was washed several times with deionized water and ethanol to completely remove nickel ions and sodium ions in the reactant. The precipitate was dried at 70 °C and N at 800 °C 2 Treated in the atmosphere for 2 hours (heating rate 4°C·min -1 ), after the reaction was completed, the furnac...

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Abstract

The invention discloses a nickel oxide and microcrystalline graphite composite which is formed by compositing nickel oxide and nanometer microcrystalline graphite. The invention also discloses a preparation method and an application of the nickel oxide and microcrystalline graphite composite. The raw material cost of preparation is low, and the equipment for preparation is simple. The decomposition of carbon nanofibers is realized in a strong alkaline hydrothermal system and synchronizes with the growth of NiO crystals, and the carbon nanofibers and the NiO crystals form a uniform composite atthe nanoscale. At the same time, the existence of microcrystalline graphite contributes to the formation of nickel oxide hexagonal nanosheets. When the nickel oxide and microcrystalline graphite composite is used as a negative electrode material for lithium batteries, the reversible capacity can still be maintained at 1111.6 mAh.g<-1> after 45 cycles. Both NiO and microcrystalline graphite can participate in the electrochemical lithium storage reaction, and microcrystalline graphite can improve the conductivity of the material and reduce volume change during lithium storage of NiO. Therefore,the electrochemical property of the composite is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a nickel oxide and microcrystalline graphite composite, a preparation method and application thereof. Background technique [0002] In recent years, due to the increasingly serious problems of energy resource consumption and global warming, renewable energy and environmentally friendly energy storage devices have attracted considerable attention. At present, new energy storage devices that are vigorously developed include lithium-ion batteries, sodium-ion batteries, supercapacitors and fuel cells. Lithium-ion batteries have become one of the most popular power sources in the pure electric vehicle and hybrid vehicle market due to their high energy density, long cycle life and environmental friendliness. [0003] However, the theoretical capacity of commercial graphite is low, only 372mAh g -1 , the application space in high-energy and high-power e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M4/525C01B32/20
CPCC01B32/20H01M4/362H01M4/48H01M4/525H01M4/583H01M4/625Y02E60/10
Inventor 杨刚马腾飞蒋嘉琳
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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