Preparation method of magnesium-aluminum-vanadium co-doped lithium cobalt oxide positive electrode material

A positive electrode material and co-doping technology, applied in positive electrodes, chemical instruments and methods, cobalt compounds, etc., can solve the problems of inability to improve the charging capacity of lithium cobaltate materials, short service life, slow charging speed, etc., and achieve reduction Polarization effect, good cycle performance, and the effect of increasing the discharge platform

Pending Publication Date: 2022-04-19
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the prior art, Al is often used 3+ As a dopant material, since Al 3+ with Co 3+ have similar ionic radii, while α-LiAlO 2 with LiCoO 2 have a similar layered structure, the introduction of Al will not destroy the layered structure of the material, so the introduction of Al 3+ Can improve the stability of lithium cobalt oxide cathode material structure, but Al 3+ Doping can not improve the relatively low charging capacity and slow charging speed of lithium cobalt oxide materials.
Therefore, it is necessary to look for other doping materials, with Al 3+ Co-doped lithium cobalt oxide, while improving the disadvantages of relatively low charging capacity, slow charging speed, and short service life of lithium cobalt oxide positive electrode materials

Method used

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  • Preparation method of magnesium-aluminum-vanadium co-doped lithium cobalt oxide positive electrode material
  • Preparation method of magnesium-aluminum-vanadium co-doped lithium cobalt oxide positive electrode material
  • Preparation method of magnesium-aluminum-vanadium co-doped lithium cobalt oxide positive electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 200g of KL-III lithium cobaltate, 95.25g of battery grade lithium carbonate, 0.4g of magnesium oxide, 0.93g of aluminum oxide, and 0.97g of ammonium vanadate, and mix them in a planetary ball mill for 60 minutes.

[0034] (2) Transfer the mixed powder to a sagger, transfer the sagger to a muffle furnace, heat up from room temperature to 1060°C for 10 hours at a heating rate of 5°C / min, and continuously feed air as an oxygen source during the sintering process; After cooling down to room temperature naturally, take it out.

[0035] (3) Place the obtained sample in a small universal pulverizer, pulverize it for 20 seconds, pour the pulverized sample into a 325-mesh sieve for sieving, collect the sieved sample, and obtain a co-doped positive electrode material powder, D50 = 16.5 μm.

[0036] (4) The prepared LiCoO 2 Mix the sample, conductive agent SP, and binder PVDF at a mass ratio of 90:5:5, add the binder NMP, stir evenly, and coat it on a 12 μm thick alumi...

Embodiment 2

[0038] (1) Put KL-III type cobalt oxide, lithium carbonate, nano-magnesia, nano-alumina, and ammonium vanadate raw materials into a high-speed mixing device and mix for 10 minutes, wherein the molar ratio of lithium element to cobalt element is 1.04, and the nano-magnesium oxide The mass fraction is 0.05%, the mass fraction of nano-alumina is 0.05%, and the mass fraction of ammonium vanadate is 0.05%;

[0039] b. Place the mixed raw materials in step a in a box furnace at 500°C, and sinter at a constant temperature in an air atmosphere for 2 hours. After the sintering is completed, naturally cool to room temperature and take it out;

[0040] c. After the product obtained in step b is pulverized through a 200-mesh sieve, a magnesium-aluminum-vanadium co-doped lithium cobalt oxide positive electrode material is obtained. The obtained product has a D50 of 16.2 μm and a discharge capacity of 188.7 Mah / g at a rate of 0.2C and a voltage of 4.5V.

Embodiment 3

[0042] (1) Put cobalt oxide, lithium carbonate, nano-magnesia, nano-alumina, and ammonium vanadate raw materials into a three-dimensional mixing device and mix for 100 minutes, wherein the molar ratio of lithium element to cobalt element is 1.05, and the mass fraction of nano-magnesia is 0.1 %, the massfraction of nano-alumina is 0.3%, and the massfraction of ammonium vanadate is 0.3%;

[0043] b. Place the mixed raw materials in step a in a box furnace at 800°C, and sinter at a constant temperature in an air atmosphere for 10 hours. After the sintering is completed, naturally cool to room temperature and take it out;

[0044]c. After the product obtained in step b is pulverized through a 350-mesh sieve, a magnesium-aluminum-vanadium co-doped lithium cobalt oxide positive electrode material is obtained. The obtained product has a D50 of 16.4 μm and a discharge capacity of 188.2 Mah / g at a rate of 0.2C and a voltage of 4.5V.

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Abstract

The invention discloses a preparation method of a magnesium-aluminum-vanadium co-doped lithium cobalt oxide positive electrode material, which comprises the following steps: a, cobalt oxide, lithium carbonate, magnesium oxide, aluminum oxide and ammonium vanadate raw materials are uniformly mixed, the molar ratio of the lithium element to the cobalt element is 1.04-1.06, the mass fraction of the magnesium oxide is 0.05-0.2%, the mass fraction of the aluminum oxide is 0.05-0.5%, the mass fraction of the ammonium vanadate is 0.05-0.5%, and the molar ratio of the lithium element to the cobalt element is 1.04-1.06; the mass fraction of the ammonium vanadate is 0.05%-0.5%; b, putting the raw materials mixed in the step a into calcining equipment at 500-1080 DEG C, sintering for 2-20 hours at a constant temperature, cooling to room temperature after sintering, and taking out; and c, crushing and sieving the product obtained in the step b to obtain the magnesium-aluminum-vanadium co-doped lithium cobalt oxide positive electrode material. By doping magnesium, aluminum and vanadium elements, the stable cycle performance of lithium cobalt oxide under 4.5 V voltage is improved, and the capacity is better under high-voltage charging and discharging conditions.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a magnesium-aluminum-vanadium co-doped lithium cobalt oxide positive electrode material. Background technique [0002] Due to the advantages of high working voltage, small size, light weight, high specific energy, no pollution, small self-discharge, and recyclable use, lithium-ion batteries have become an ideal energy source for development in the 21st century. The development process of cathode materials, which are the main components of lithium-ion batteries, restricts the development of lithium-ion batteries to a large extent. Lithium cobalt oxide (LiCoO 2 ) is the first to be commercialized because of its simple preparation process, large specific capacity, good cycle performance and safety performance compared with other cathode materials. Lithium cobalt oxide has the disadvantages of relatively low charging capacity, slow charging speed, and sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M4/38H01M4/485H01M4/525H01M10/0525
CPCC01G51/42H01M4/382H01M4/485H01M4/525H01M10/0525H01M2004/028C01P2002/52C01P2004/03C01P2006/40Y02E60/10
Inventor 许开华王彦刚杨克涛张银鹏宋亚芳张军丽杨荣
Owner GEM JIANGSU COBALT IND CO LTD
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