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Preparation method for ternary positive electrode active material and battery

A positive electrode active material and material technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of low compaction density of ternary positive electrode active materials, and achieve the effect of simple and easy process

Active Publication Date: 2013-04-24
GUIZHOU ANDA TECH ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the problem of low compaction density of the ternary positive electrode active material in the prior art, the present invention provides a preparation method of the ternary positive electrode active material, which can greatly improve the compaction density of the ternary positive electrode active material, and the The method and process are simple and easy

Method used

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Examples

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preparation example Construction

[0016] The preparation method of the ternary positive electrode active material disclosed by the invention comprises:

[0017] S1. Mix lithium source, nickel source, cobalt source and manganese source to obtain a mixture;

[0018] S2, drying the mixture, and then pre-calcining in an oxidizing atmosphere at 200-800° C. to obtain a precursor;

[0019] S3, mixing the precursor with the binder, and then performing isostatic pressing to obtain a compacted material; wherein, the isostatic pressing pressure is 10-50 MPa;

[0020] S4. Sintering the compacted material in an oxidative atmosphere at a temperature of 800-1200° C., crushing and sieving to obtain a ternary positive electrode active material.

[0021] Among them, in the present invention, the emphasis is on providing a ternary positive electrode active material (LiNi x co y mn z o 2 ) preparation method, in this method, the various raw materials selected as the lithium source, the nickel source, the cobalt source, the m...

Embodiment 1

[0051] This example is used to illustrate the preparation method of the ternary cathode active material disclosed in the present invention.

[0052] Lithium carbonate, nickel nitrate, cobalt nitrate, and manganese nitrate are used as raw materials, and the molar ratio of lithium, nickel, cobalt, and manganese is 3.3:1:1:1; first mix nickel nitrate, cobalt nitrate, and manganese nitrate evenly, and then add Lithium carbonate, mixed evenly, dried in an oven at 100°C, and then pre-fired in air at 800°C for 10 hours to obtain the precursor. Grind the precursor and 2% lithium fluoride evenly and press it into a square tablet with a thickness of 50mm and a length of 100mm in a tablet machine, and then compact it in a 50Mpa isostatic pressing device. After sintering at ℃ for 15 hours, crush and sieve to obtain LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Cathode material.

[0053] After testing, when charging and discharging at 0.1C between 2.75-4.2v, the initial discharge capacity of the materia...

Embodiment 2

[0055] This example is used to illustrate the preparation method of the ternary cathode active material disclosed in the present invention.

[0056] Using lithium carbonate, nickel nitrate, cobalt nitrate and manganese chloride as raw materials, the molar ratio of lithium, nickel, cobalt and manganese is 3.3:5:2:3; first mix nickel nitrate, cobalt nitrate and manganese chloride evenly, then Then add lithium carbonate, mix evenly, dry in an oven at 100°C, and then pre-fire in air at 800°C for 10 hours to obtain the precursor. Grind the precursor and 2% lithium tetraborate evenly and press it into a square block with a thickness of 50mm and a length of 100mm in a tablet machine, and then compact it in a 50Mpa isostatic pressing device. After sintering at ℃ for 15 hours, crush and sieve to obtain LiNi 0.5 co 0.2 mn 0.3 o 2 Cathode material.

[0057] After testing, the material is charged and discharged at 0.1C between 2.75-4.2v, the first discharge capacity of the material i...

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Abstract

The invention provides a preparation method for a ternary positive electrode active material. The preparation method comprises the following steps: S1, mixing a lithium source, a nickel source, a cobalt source and a manganese source to obtain a mixture; S2, drying the mixture and pre-burning the mixture in an oxidizing atmosphere at a temperature of 200 to 800 DEG C so as to obtain a precursor; S3, mixing the precursor with a bonding agent and then carrying out isostatic pressing so as to obtain a compacted material, wherein isostatic pressing pressure is 10 to 50 MPa; and S4, sintering the compacted material in an oxidizing atmosphere at a temperature of 800 to 1200 DEG C and carrying out crushing and screening so as to obtain the ternary positive electrode active material. Meanwhile, the invention further discloses a battery prepared from the ternary positive electrode active material prepared by using the preparation method. With the preparation method for the ternary positive electrode active material, compaction density of the ternary positive electrode active material can be greatly improved; and the method is simple and easily practicable.

Description

technical field [0001] The invention relates to a preparation method of a ternary positive electrode active material for a lithium ion battery and a battery prepared by using the ternary positive electrode active material. Background technique [0002] Lithium-ion batteries are widely used in many fields such as portable electronic devices and electric vehicles because of their advantages such as high voltage, high energy density, long service life, low self-discharge, no memory effect, and low pollution. The positive electrode material occupies an important position in the lithium-ion battery structure, and its performance directly determines the performance of the final secondary battery product, and its performance and price will directly affect the performance and price of the lithium-ion battery. [0003] LiCoO 2 As a cathode material for lithium-ion batteries, it has been commercially produced for many years, but due to the scarcity of Co resources, its cost is much h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 刘建波
Owner GUIZHOU ANDA TECH ENERGY CO LTD
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