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Cobaltosic oxide preparation method for lithium ion battery

A technology for tricobalt tetroxide and lithium ion batteries, which is applied in the directions of cobalt oxide/cobalt hydroxide, battery electrodes, circuits, etc., can solve problems such as no involvement, and achieve high bulk density, improved electrical performance and service life, and high conversion rate. Effect

Active Publication Date: 2006-09-13
GEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Co 3 o 4 The particle size and bulk density of the product also have a great influence on the particle size and particle morphology of its precursor cobalt salt. The control of various operating conditions in the preparation of cobalt salt is also very important, but it is not involved in the prior art

Method used

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  • Cobaltosic oxide preparation method for lithium ion battery
  • Cobaltosic oxide preparation method for lithium ion battery
  • Cobaltosic oxide preparation method for lithium ion battery

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0048] use as figure 1 The processing method shown prepares cobalt tetroxide, and its steps are:

[0049] 1. Preparation of spherical cobalt oxalate powder:

[0050] a. Prepare an aqueous solution of cobalt chloride, mix aqua regia (HCl:HNO) 3 =3:1) heated to 80-90 ℃, the electrolyzed cobalt sheet was dissolved therein to form a cobalt chloride solution with a concentration of 100 g / L, and oxalic acid was added for acidification, so that the pH of the cobalt chloride aqueous solution was 0.6- 0.8;

[0051] b. Preparation of ammonium oxalate aqueous solution: pass NH into oxalic acid 3 , so that the concentration is 90 g / L, and the pH of the ammonium oxalate aqueous solution is 4.3-4.5; in the ammonium oxalate solution, a dispersant is added, which is polyethylene glycol (molecular weight is 4000), and the addition amount of the dispersant is Add 6.25 grams per 10 liters of aqueous ammonium oxalate.

[0052] c. Add the ammonium oxalate aqueous solution prepared in step b i...

Embodiment 2

[0068] 1. Preparation of spherical cobalt carbonate powder:

[0069] a. Prepare an aqueous cobalt chloride solution with a concentration of 60 g / L, and add sulfuric acid to make the pH of the cobalt salt aqueous solution 0.5-0.6;

[0070] b. Prepare an aqueous ammonium bicarbonate solution with a concentration of 70 g / L, and introduce ammonia to make the pH of the aqueous ammonium bicarbonate solution 7-9; add a dispersant to the ammonium bicarbonate solution, which is maleic butadiene and acrylic acid The ratio of the mixture is: 1:1, and the addition amount of the dispersant is 7 grams per 10 liters of ammonium bicarbonate aqueous solution.

[0071] c. The ammonium bicarbonate aqueous solution is sprayed into the cobalt salt aqueous solution until the pH of the mixed solution reaches 7.5-8.5, and the above pH is maintained during the reaction process. The method for maintaining the pH unchanged is to make the cobalt salt solution. The addition amount of ammonium bicarbonate...

Embodiment 3

[0084] 1. Preparation of spherical cobalt hydroxide powder:

[0085] a. Prepare an aqueous cobalt chloride solution with a concentration of 120 g / L, and add hydrochloric acid to make the pH of the aqueous solution 0.9-1.1;

[0086] b. Preparation of ammonia-containing NaOH solution, its concentration is 20%, and the ammonia water whose specific gravity d is 95% is introduced, and the volume ratio of NaOH (20%) and ammonia water (specific gravity=0.95) is 8:1; The dispersant is a mixture of butadiene and acrylic acid, the ratio of which is 1:1, and the addition amount of the dispersant is 7 grams per 10 liters of NaOH aqueous solution.

[0087] c. The NaOH solution obtained in step b is sprayed into the cobalt raw material aqueous solution, and the pH is maintained at 10-11, so that the reaction is carried out at a stable pH. The way to maintain pH is to stabilize the added amount of cobalt chloride and adjust the added amount of NaON solution at any time. The reaction temper...

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Abstract

The invention discloses a process for preparing cobalto-cobaltic oxide for used in lithium ion battery, wherein cobalt oxalate or cobalt hydroxide or cobaltous carbonate is used as raw material for three segment calcinations, during which the thermal cracking and oxidization of cobalt salt are divided into two procedures, no oxidation agent is provided during the thermal cracking of the cobalt salt, thus converting all of them into cobaltous oxide, then temperature is elevated to oxidization temperature and oxygen of air atmosphere is provided, so as to converting all cobaltous oxide into cobaltic-cobaltous oxide. The product made thereby has high conversion rate of cobaltic-cobaltous oxide, less cobalt oxidates of other forms, epigranularity and apparent density. íí

Description

technical field [0001] The invention relates to the field of preparation of metal oxides, and provides a preparation method of tricobalt tetroxide as a raw material of lithium cobalt oxide, a positive electrode material of lithium ion batteries. Background technique [0002] The positive electrode material in lithium ion batteries is mainly lithium cobalt oxide, and the key material for preparing lithium cobalt oxide is cobalt tetroxide. and service life have a significant impact. Cobalt tetroxide used in batteries has strict requirements on chemical composition. In the prior art, a more economical and practical method for preparing cobalt tetroxide is calcination and thermal decomposition, that is: cobalt salts such as cobalt carbonate, cobalt hydroxide or cobalt oxalate are heated at high temperature. calcined to obtain cobalt tetroxide. [0003] Cobalt is a variable valence element (divalent, trivalent), and its oxides are cobalt oxide (CoO), cobalt trioxide (CoO). 2 O...

Claims

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Application Information

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IPC IPC(8): C01G51/04C01G51/06C07C69/36H01M4/52
CPCY02E60/10
Inventor 许开华郭学益杨娟玉赖单舟
Owner GEM CO LTD
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