Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of vanadium-doped cobalt oxide

A technology of cobalt oxide and cobalt hydroxide, applied in the direction of cobalt oxide/cobalt hydroxide, can solve the problems of easy collapse of the crystal structure, affecting the charging and discharging performance of the battery, and rapid capacity decay, so as to improve the cycle performance, improve the uniformity, cost reduction effect

Inactive Publication Date: 2020-05-08
GEM JIANGSU COBALT IND CO LTD +2
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the prior art, high-voltage lithium cobaltate is prepared by coating cobalt tetroxide doped in a coating manner, which will form lithium cobaltate without doping elements inside. The internal crystal structure is easy to collapse under high voltage, resulting in rapid capacity decay, and , the elements doped by this method are not easy to enter the crystal lattice of cobalt tetroxide, and a large part of the doping elements exist in the cobalt tetroxide powder in the form of mixture, which affects the charge and discharge performance of the battery

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 of the present invention provides a method for preparing vanadium-doped cobalt oxide, which is implemented through the following steps:

[0029] Step 1, add ammonia water with a concentration of 0.1-1g / L to the reaction kettle as the reaction bottom liquid and heat it to 50°C, adjust and control the pH value of the reaction system to 9.0-11.0, and stir the reaction bottom liquid with a stirring intensity of 200r / min Stir, add vanadium-containing cobalt sulfate solution, concentration is 100~400g / L sodium hydroxide solution, add vanadium-containing cobalt sulfate solution and the volume flow ratio of sodium hydroxide solution to the reaction bottom liquid in the stirring process and be 1: 0.5, and at 10m 3 Feed air or oxygen into the reactor at a rate of / h, react for 40 hours until the co-precipitation reaction is complete, and obtain a vanadium-containing cobalt hydroxide slurry;

[0030] Step 2: Aging the vanadium-containing cobalt hydroxide slurry obtai...

Embodiment 2

[0034] Embodiment 2 of the present invention provides a method for preparing vanadium-doped cobalt oxide, which is implemented through the following steps:

[0035] Step 1, add tartaric acid with a concentration of 0.1-1g / L into the reaction kettle as the reaction bottom liquid and heat it to 68°C, adjust and control the pH value of the reaction system to 9.0-11.0, and stir the reaction bottom with a stirring intensity of 320r / min During the stirring process, cobalt nitrate solution containing vanadium is added in parallel to the reaction bottom liquid, the concentration is 100-400g / L sodium hydroxide solution, and the volume flow ratio of cobalt nitrate solution containing vanadium and sodium hydroxide solution is 1 :1, and at 20m 3 Feed air or oxygen into the reactor at a rate of / h, react for 26 hours until the co-precipitation reaction is complete, and obtain a vanadium-containing cobalt hydroxide slurry;

[0036]Step 2: Aging the vanadium-containing cobalt hydroxide slur...

Embodiment 3

[0040] Embodiment 3 of the present invention provides a method for preparing vanadium-doped cobalt oxide, which is implemented through the following steps:

[0041] Step 1, add ammonia water with a concentration of 0.1-1g / L to the reaction kettle as the reaction bottom liquid and heat it to 80°C, adjust and control the pH value of the reaction system to 9.0-11.0, and stir the reaction bottom liquid with a stirring intensity of 400r / min Stir, add vanadium-containing cobalt sulfate solution, concentration is 100~400g / L sodium hydroxide solution, add vanadium-containing cobalt sulfate solution and the volume flow ratio of sodium hydroxide solution to the reaction bottom liquid in the stirring process and be 1: 1.5, and at 30m 3 Feed air or oxygen into the reactor at a rate of / h, react for 10 hours until the co-precipitation reaction is complete, and obtain a vanadium-containing cobalt hydroxide slurry;

[0042] Step 2: Aging the vanadium-containing cobalt hydroxide slurry obtai...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of vanadium-doped cobalt oxide. The method comprises the following steps: adding a reaction base solution into a reaction kettle, and heating; adding a vanadium-containing cobalt salt solution, a sodium hydroxide solution and an oxidizing agent into the reaction base solution in a parallel flow manner; controlling the pH value of the reaction system; stirring until the reaction is complete to obtain vanadium-containing cobalt hydroxide slurry; sequentially carrying out aging, filtering, washing, drying and iron removal on the vanadium-containing cobalt hydroxide slurry to obtain vanadium-containing cobalt hydroxide powder; and calcining the vanadium-containing cobalt hydroxide powder according to a temperature curve to obtain vanadium-doped cobalt oxide. According to the invention, by doping vanadium into cobalt oxide, the cycle performance of the cobalt oxide as a battery material is improved while the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of cobalt oxide, and in particular relates to a preparation method of cobalt oxide doped with vanadium. Background technique [0002] 3C electronic products are required to be light and compact, and the corresponding batteries need to have high energy density. Lithium cobaltate is currently the most important positive electrode material for 3C electronic products, and its energy density determines the energy density of lithium-ion batteries to a certain extent. High-voltage lithium cobalt oxide has the characteristics of high gram capacity and high voltage, and has higher energy density than conventional lithium cobalt oxide. It is the main direction of research and development of lithium cobalt oxide in the future. High-voltage lithium cobalt oxide is doped with certain metal elements in lithium cobalt oxide to improve the crystal structure stability of lithium cobalt oxide under high voltag...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04
CPCC01G51/04C01P2004/61C01P2006/11C01P2006/12
Inventor 李炳忠张爱青史齐勇王博许东伟伍一根
Owner GEM JIANGSU COBALT IND CO LTD