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LiNiCoAlO2 composite cathode material and preparation method thereof, and lithium ion battery

A composite positive electrode material, a technology for lithium ion batteries, applied in the field of its preparation, lithium nickel cobalt aluminum oxide composite positive electrode material, can solve the problems of increased surface pH, difficulty in preparation, high temperature storage and poor high temperature cycle performance, etc., to achieve high temperature The effect of improving cycle and high temperature storage performance, reducing lithium impurity content and reducing gas production

Inactive Publication Date: 2014-04-09
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Li impurity (Li 2 CO 3 and LiOH) will increase the surface pH of the material, and the water content will increase accordingly, resulting in poor dispersion and stability of the slurry, and gelation is prone to occur during the slurry preparation process, making it difficult to prepare
[0004] (2) Poor performance in high temperature storage and high temperature cycle
However, this method cannot solve the problem of high oxidation and high activity Ni 4+ Catalytic decomposition of the solvent in the electrolyte system at high temperature, there is still a large amount of CO in high temperature storage and high temperature cycle 2 The generation of gas still has a great impact on the performance of the battery, and it is difficult to meet the current requirements of electric vehicles for power batteries

Method used

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  • LiNiCoAlO2 composite cathode material and preparation method thereof, and lithium ion battery
  • LiNiCoAlO2 composite cathode material and preparation method thereof, and lithium ion battery
  • LiNiCoAlO2 composite cathode material and preparation method thereof, and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0064] Lithium carbonate and Ni 0.99 co 0.01 al 0.01 (OH) 2 According to the ratio of Li / M of 1.05:1, add it into the three-dimensional mixer and mix it, the frequency is 30Hz, and the mixing time is 3h to obtain a homogeneous mixture; the homogeneous mixture is placed in the atmosphere sintering furnace, and the temperature is raised to 750 at a heating rate of 3°C / min. ℃, keep warm for 10h, continuously feed oxygen during the calcination process, the flow rate is 20mL / min, naturally cool to room temperature after calcination, and obtain the matrix material LiNi by crushing, grading and sieving 0.99 co 0.01 al 0.01 o 2 ; Slowly add 1000g of matrix material into 1000g of the mixed solution (including 700g of methanol and 300g of acetic acid), continue to stir, control the speed at 100rpm, and stir for 120min to obtain a suspension; put the suspension in a centrifuge and centrifuge , the centrifugal speed is 6000rpm, the centrifugation time is 10min, and then washed with ...

Embodiment 2

[0066] Lithium hydroxide and Ni 0.90 co 0.05 al 0.05 (OH) 2 According to the ratio of Li / M of 1.08:1, add it into the three-dimensional mixer and mix it, the frequency is 20Hz, and the mixing time is 8h to obtain a homogeneous mixture; the homogeneous mixture is placed in the atmosphere sintering furnace, and the temperature is raised to 800 at a heating rate of 2°C / min. ℃, keep warm for 6h, continuously feed oxygen during the calcination process, the flow rate is 60mL / min, naturally cool to room temperature after calcination, and obtain the matrix material LiNi through crushing, grading and sieving 0.90 co 0.05 al 0.05 o 2 ; Slowly add 1000g of matrix material into 500g of the mixed solution (including 350g of ethanol and 150g of formic acid), continue to stir, control the rotation speed at 200rpm, and stir for 30min to obtain a suspension; put the suspension in a centrifuge and centrifuge , the centrifugal speed is 7000rpm, the centrifugation time is 5min, and then was...

Embodiment 3

[0068] Lithium carbonate and Ni 0.80 co 0.15 al 0.05 (OH) 2 According to the ratio of Li / M of 1.02:1, add it into the three-dimensional mixer and mix it, the frequency is 30Hz, and the mixing time is 10h to obtain a homogeneous mixture; the homogeneous mixture is placed in the atmosphere sintering furnace, and the temperature is raised to 780 at a heating rate of 8°C / min. ℃, keep warm for 20h, continuously feed oxygen during the calcination process, the flow rate is 5mL / min, naturally cool to room temperature after calcination, and obtain the matrix material LiNi through crushing, grading and sieving 0.80 co 0.15 al 0.05 o 2 ; Slowly add 250g of matrix material into 1000g of the mixed solution (including 800g of ethanol and 200g of isopropionic acid), continue to stir, control the speed at 300rpm, and stir for 180min to obtain a suspension; put the suspension in a centrifuge, Centrifugal separation, the centrifugal speed is 8000rpm, the centrifugation time is 20min, and ...

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Abstract

The invention relates to a LiNiCoAlO2 composite cathode material and a preparation method thereof, and a lithium ion battery. The composite cathode material is of a core-shell structure, wherein a core is LiNi1-x-yCoxAlyO2 subjected to washing treatment by using a mixed solution of alcohol and organic acids, x is greater than 0 and less than or equal to 0.2, and y is greater than 0 and less than or equal to 0.1; and a shell is a metal oxide layer. According to the invention, the composite cathode material is prepared by using a process combining an operation of washing a base material by using a mixed solution of alcohol and organic acids and an operation of carrying out spray drying on a material wrapped on the shell layer. The composite cathode material disclosed by the invention is low in lithium impurity content and high in high-temperature cycling and high-temperature storage performances.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion batteries, in particular to lithium-ion battery cathode materials, in particular to a lithium-nickel-cobalt-aluminum oxide composite cathode material, a preparation method thereof, and lithium-nickel-cobalt-aluminum oxide composite cathode materials prepared using the lithium-ion battery cathode material. ion battery. Background technique [0002] At present, the commonly used cathode material for high energy density lithium-ion batteries is LiCoO 2 , under the constraints of compaction density, upper limit voltage and other conditions, its energy density has reached the limit, and the polarization of the battery is very large under this energy density, it is difficult to meet the requirements of high output power and long service life. Same as LiCoO 2 Compared with the layered lithium nickel cobalt aluminum oxide cathode material LiNi 1-x-y co x Al y o 2 (where 0<x≤0.2, 0<...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/485H01M10/0525
CPCY02E60/122C01G51/42C01G53/42H01M4/525H01M10/0525H01M4/131Y02E60/10C01D15/00C01F7/00C01G53/00H01M4/48H01M4/505H01M4/62H01M10/052
Inventor 杨顺毅傅儒生黄友元任建国程林
Owner BTR NEW MATERIAL GRP CO LTD
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