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Method for preparing lithium ion battery positive electrode active material lithium-nickel-cobalt-oxygen

A positive active material, lithium nickel cobalt technology, which is applied in the field of preparation of lithium nickel cobalt oxygen, the positive active material of lithium ion batteries, can solve the problems of uneven particle size distribution and irregular crystal morphology of lithium nickel cobalt oxygen, and achieve crystal The effect of regular shape and uniform crystal size distribution

Inactive Publication Date: 2010-03-24
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a lithium-ion battery positive active material lithium nickel cobalt in order to overcome the disadvantages of uneven particle size distribution and irregular crystal morphology of lithium ion secondary battery positive active material lithium nickel cobalt oxygen crystals prepared by the existing method A method for preparing oxygen, the lithium nickel cobalt oxide crystals prepared by the method have uniform particle size distribution and regular crystal morphology

Method used

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  • Method for preparing lithium ion battery positive electrode active material lithium-nickel-cobalt-oxygen
  • Method for preparing lithium ion battery positive electrode active material lithium-nickel-cobalt-oxygen
  • Method for preparing lithium ion battery positive electrode active material lithium-nickel-cobalt-oxygen

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preparation example Construction

[0022] The preparation method of lithium-nickel-cobalt-oxygen, the cathode active material of lithium-ion secondary battery provided by the present invention, comprises:

[0023] (1) Under stirring conditions, the mixed aqueous solution containing divalent cobalt ions and divalent nickel ions is mixed with the aqueous solution containing carbonate ions, separated and washed to obtain a nickel-cobalt carbonate precursor containing divalent cobalt and divalent nickel;

[0024] (2) calcining the nickel-cobalt carbonate precursor containing divalent cobalt and divalent nickel obtained in (1) under the protection of an inert or reducing atmosphere to obtain an oxide precursor containing divalent cobalt and divalent nickel;

[0025] (3) The oxide precursor containing divalent cobalt and divalent nickel obtained in (2) is mixed with a lithium compound, and calcined in an oxidative atmosphere with an oxygen partial pressure not lower than 0.02 MPa.

[0026] Because the mixed aqueous s...

Embodiment 1

[0040] This example illustrates the preparation method of the lithium-nickel-cobalt-oxygen active material of the positive electrode of the lithium-ion secondary battery provided by the present invention.

[0041] The sum of the moles of Co and Ni is 5 moles / liter, and the CoSO with a molar ratio of Co and Ni of 7:3 4 and NiSO 4 The mixed solution and the sodium carbonate aqueous solution of 10 mol / liter are mixed, are all input in the reaction kettle of 20 liters of volume with the speed of 50 milliliters / minute respectively by J-W-22 / 0.2 type metering pump (Huai'an Huayu Metering Pump Co., Ltd.) , and start stirring at a speed of 500 rpm for 30 minutes at the same time, and the metering pump stops input when the liquid fills the reactor. The resulting precipitate is centrifuged at 800 rpm, washed with deionized water until the ion content of the washed deionized water is 0.0008 mol / liter, to obtain a nickel-cobalt carbonate precursor containing divalent cobalt and divalent ...

Embodiment 2

[0045] This example illustrates the preparation method of the lithium-nickel-cobalt-oxygen active material of the positive electrode of the lithium-ion secondary battery provided by the present invention.

[0046] CoSO with the sum of the moles of Co and Ni being 10 moles / liter and the molar ratio of Co and Ni being 8:2 4 and NiSO 4 The mixed solution of the mixed solution is input in the reaction kettle of 10 liters of volumes with 50 milliliters / min by metering pump (same as embodiment 1), adds 4000 milliliters of 10 mol / liters of ammonium bicarbonate aqueous solution and 1000 milliliters of 0.2 mol / liters of ammonium bicarbonate solution in advance in this reaction kettle The ammoniacal liquor of 1 liter was stirred simultaneously with the rotating speed of 500 rev / min for 30 minutes, and the metering pump stopped input when the liquid filled the reactor. After stirring evenly, the pH value of the liquid is 12. The resulting precipitate is centrifuged at 600 rpm, washed w...

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Abstract

The process of preparing active positive electrode material Li-Ni-Co-O for lithium ion cell includes: mixing mixture water solution containing bivalent Co ion and bivalent Ni ion and water solution ofcarbonic radical ion through stirring, separating the resultant and washing to obtain cobalt nickel carbonate precursor; calcining the precursor in inert gas or reductant atmosphere to obtain oxide precursor containing bivalent Co ion and bivalent Ni ion; mixing the oxide precursor and lithium compound and calcining in oxidizing atmosphere with oxygen partial pressure not lower than 0.02 MPa. Thepreparation process can obtain active positive electrode material Li-Ni-Co-O crystal with homogeneous size distribution and regular crystal shape.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode active material of a lithium ion battery, in particular to a preparation method of lithium nickel cobalt oxide, a positive electrode active material of a lithium ion battery. Background technique [0002] In the prior art, when preparing lithium-ion secondary positive electrode active material lithium nickel cobalt oxide, nickel salt and cobalt salt are generally prepared as co-precipitation precursors, and then the precipitate is ground and mixed with lithium salt and then calcined at high temperature. For example, CN 1792807A discloses a lithium ion battery LiNi 1-x co x o 2 The preparation method of the cathode material of the present invention, the method comprises preparing the mixed salt solution of divalent nickel and cobalt, adding ammonium bicarbonate solution under the condition of stirring, after aging the obtained slurry for 1-10 hours, separating and washing the solid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G1/02C01D15/02C01G51/04C01G53/04H01M4/52H01M4/525
CPCY02E60/10
Inventor 曹丽娟冯胜雷姜占峰
Owner BYD CO LTD