Method for preparing nickel-doped vanadium pentoxide nanometer sheet-like positive electrode material of lithium ion battery

A vanadium pentoxide nanometer, lithium ion battery technology, applied in battery electrodes, nanotechnology for materials and surface science, batteries, etc., can solve the problems of long sample preparation period and poor cycle stability, and improve the application value. , good rate performance, low production cost

Inactive Publication Date: 2017-08-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the vanadium pentoxide introduced above has a high specific capacity for the first discharge as a positive electrode material for lithium-ion batteries, it has disadvantages such as poor cycle stability and long sample preparation cycle.

Method used

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  • Method for preparing nickel-doped vanadium pentoxide nanometer sheet-like positive electrode material of lithium ion battery
  • Method for preparing nickel-doped vanadium pentoxide nanometer sheet-like positive electrode material of lithium ion battery
  • Method for preparing nickel-doped vanadium pentoxide nanometer sheet-like positive electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First accurately weigh 0.364g V 2 o 5 Powder, while magnetic stirring, it is slowly added in the beaker that fills 65mL distilled water, fully stirs, then slowly add 6mL mass fraction with the dropper and be the hydrogen peroxide solution (H 2 o 2 ), after a period of continuous stirring, the yellow suspension in the beaker gradually turned into a brown transparent solution, and V 2 o 5 Sol; then accurately weigh 0.254g of nickel acetate tetrahydrate with a purity of 98wt%, dissolve it in 30mL of distilled water, keep stirring with a glass rod and then set the volume to 100mL to obtain a nickel acetate solution with a concentration of 0.01mol / L ; Accurately measure 4 mL of nickel acetate solution with a concentration of 0.01 mol / L, and slowly add it dropwise to the above-mentioned V 2 o 5 Stirring was continued in the sol for 30 minutes, at this time n(V 2 o 5 ):n(Ni)=1:0.02, promptly obtain the nickel-doped vanadium pentoxide sol that doping amount is 2%;

[00...

Embodiment 2

[0035] First accurately weigh 0.364g V 2 o 5 Powder, while magnetic stirring, it is slowly added in the beaker that fills 60mL distilled water, fully stirs, then slowly add 5mL mass fraction with the dropper and be the hydrogen peroxide solution (H 2 o 2 ), after a period of continuous stirring, the yellow suspension in the beaker gradually turned into a brown transparent solution, and V 2 o 5 Sol; then accurately weigh 0.254g of nickel acetate tetrahydrate with a purity of 98wt%, dissolve it in 30mL of distilled water, keep stirring with a glass rod and then set the volume to 100mL to obtain a nickel acetate solution with a concentration of 0.01mol / L ; Accurately measure 8mL concentration of nickel acetate solution that is 0.01mol / L, and slowly add it dropwise to the above-mentioned V 2 o 5 Stirring was continued in the sol for 30 minutes, at this time n(V 2 o 5 ):n(Ni)=1:0.04, promptly obtaining the nickel-doped vanadium pentoxide sol that doping amount is 4%;

[003...

Embodiment 3

[0044] First accurately weigh 0.546g V 2 o 5 Powder, while magnetic stirring, it is slowly added in the beaker that fills 100mL distilled water, fully stirs, then slowly add 8mL mass fraction with the dropper and be the hydrogen peroxide solution (H 2 o 2 ), after a period of continuous stirring, the yellow suspension in the beaker gradually turned into a brown transparent solution, and V 2 o 5 Sol; then accurately weigh 0.254g of nickel acetate tetrahydrate with a purity of 98wt%, dissolve it in 30mL of distilled water, keep stirring with a glass rod and then set the volume to 100mL to obtain a nickel acetate solution with a concentration of 0.01mol / L ; Accurately measure 18mL concentration of nickel acetate solution that is 0.01mol / L, and slowly add it dropwise to the above-mentioned V 2 o 5 Stirring was continued in the sol for 30 minutes, at this time n(V 2 o 5 ):n(Ni)=1:0.06, promptly obtaining the nickel-doped vanadium pentoxide sol that doping amount is 6%;

[0...

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Abstract

The invention relates to the field of lithium batteries. The invention discloses a method for preparing a nickel-doped vanadium pentoxide nanometer sheet-like positive electrode material of a lithium ion battery. The method is characterized by comprising the following steps: (1) preparing a vanadium pentoxide sol with vanadium pentoxide, deionized water and a hydrogen peroxide solution; (2) preparing a nickel containing dopant solution; (3) adding the nickel containing dopant solution into the vanadium pentoxide sol dropwise and carrying out stirring intensively to obtain a dopant sol; (4) transferring the dopant sol to a high-temperature reactor after aging for 1 day through standing and carrying out hydrothermal treatment by heating; (5) transferring the product having subjected to the hydrothermal treatment to a freeze drier and carrying out quick freeze drying treatment to obtain a sample after the freeze drying treatment; and (6) in the presence of high-purity argon gas or nitrogen gas, carrying out sintering treatment at a high temperature on the sample having subjected to the freeze drying treatment to obtain the nickel-doped vanadium pentoxide nanometer sheet-like positive electrode material of the lithium ion battery. The method is simple in process and convenient in operation and the performance of the positive electrode material is excellent.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a preparation method of a nickel-doped vanadium pentoxide nanometer cathode material for a high-performance lithium-ion battery. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices such as notebook computers, mobile phones, and digital cameras due to their high energy density, strong charge retention, wide range of use, fast charge and discharge, and no memory effect. in the device. The materials of lithium ion batteries are mainly positive electrode materials and negative electrode materials. The proportion of positive electrode materials in the cost of lithium ion batteries is as high as about 40%, and the positive electrode materials fundamentally determine the performance of lithium ion batteries. Therefore, the positive electrode materials are lithium ion batteries. The core and key of battery technology, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M4/36H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/485H01M4/525H01M10/0525H01M2220/30Y02E60/10
Inventor 朱泉峣雪钟丹路山万方超何欢魏伟刘作为
Owner WUHAN UNIV OF TECH
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