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Active substance of lithium ion battery anode and preparation method thereof

A cathode active material, lithium-ion battery technology, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of thermal stability, rate discharge performance cycle performance, poor overcharge performance, etc., to achieve excellent performance, excellent overcharge performance and the effect of high temperature performance

Active Publication Date: 2009-07-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of poor thermal stability, rate discharge performance, cycle performance, and overcharge performance of positive active materials in the prior art, and provide a thermal stability, rate discharge performance, cycle performance, and overcharge performance. Good positive active material and preparation method thereof

Method used

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  • Active substance of lithium ion battery anode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] This example illustrates the preparation method of the positive electrode active material of the present invention.

[0079] Dissolve lithium nitrate, nickel nitrate, manganese nitrate, cobalt nitrate and magnesium nitrate into deionized water according to the molar ratio Li:Ni:Mn:Co:Mg=1.02:0.3:0.3:0.3:0.1, and add nickel ions, manganese ions, citric acid twice the total number of moles of cobalt ions as a complexing agent. Then the oxide D1 prepared in Comparative Example 1 was added under stirring at 80°C, and the stirring was continued for 120 minutes to obtain a blue-black gel. The molar ratio of the oxide D1 to lithium nitrate is 100:1.02. The gel was dried at 120° C., and then sintered at 800° C. for 10 hours in an oxygen atmosphere to obtain a positive electrode active material M1. According to XRD diffraction analysis and ICP atomic emission spectrometry analysis, the positive electrode active material M1 contains the general formula LiNi 0.80 co 0.15 al 0...

Embodiment 2

[0082] Prepare the positive electrode active material according to the method of Example 1, the difference is that by adjusting the molar ratio of the oxide D1 and lithium nitrate so that in the obtained positive electrode active material M2, the general formula is LiNi 0.80 co 0.15 al 0.05 o 2 The oxide IA has the general formula Li(NiMn) 0.3 co 0.3 Mg 0.1 o 2 The molar ratio of oxide IB is 100:5. The average particle diameter of the oxide IA was measured to be 14 um, and the average particle diameter of the oxide IB was 100 nm.

Embodiment 3

[0084] Prepare the positive electrode active material according to the method of Example 1, the difference is that by adjusting the molar ratio of the oxide D1 and lithium nitrate so that in the obtained positive electrode active material M3, the general formula is LiNi 0.80 co 0.15 al0.05 o 2 The oxide IA has the general formula Li(NiMn) 0.3 co 0.3 Mg 0.1 o 2 The molar ratio of oxide IB is 100:10. The average particle diameter of oxide IA was measured to be 14 um, and the average particle diameter of oxide IB was 200 nm.

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Abstract

The invention provides a positive active material of a Li-ion battery. The positive active material contains an oxide IA with a formula of LiNi1-x-yCoxMyO2, wherein x and y are mole fractions; the summation of x and y is not less than 0 and less than 1; and M is selected from one or more of a group including Al, B, Mn, Fe, Ti, Mg, Cr, Ga, Cu, Zn, Y, Sr and Nb. The positive active material also contains an oxide IB having a formula of Li(NiMn)(1-a-b) / 2CoaXbO2, wherein a and b are mole fractions; the summation of a and b is not less than 0 and less than 1; and X is selected from one or more of a group including Al, B, Fe, Ti, Mg, Cr, Ga, Cu, Zn, Y, Sr and Nb. In addition, the invention also provides the positive active material preparation method. The positive active material has the advantages of excellent thermal stability, rate discharge performance, circle performance and overcharge performance.

Description

technical field [0001] The invention relates to a positive electrode active material and a preparation method thereof, in particular to a lithium ion battery positive electrode active material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long life, no memory, and low toxicity, so they have a wide range of applications. [0003] In lithium-ion batteries, the performance of the positive electrode active material is one of the keys to determine the performance of the battery. At present, the most widely used cathode active material is the transition metal oxide LiCoO with a layered structure. 2 , it has the advantages of easy synthesis, high discharge platform, long cycle life, etc., but it is expensive, low capacity, high toxicity, and there are certain safety issues, which severely limit its future application prospects. [0004] Lithium nickel oxide and its derivative...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/58H01M4/04
CPCY02E60/12Y02E60/10
Inventor 夏冬炎徐茶清
Owner BYD CO LTD
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