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Preparation method for spherical cobalt oxyhydroxide

A cobalt oxyhydroxide and spherical technology, which is applied in the field of preparation of spherical cobalt oxyhydroxide, can solve problems such as complicated process, modification and doping, and equipment addition, and achieve the effects of high density, good sphericity, and smooth design

Active Publication Date: 2014-07-02
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, CN200810162689.2 is first prepared into CoOOH·Co(OH) 2 , and then oxidized at medium and low temperature to obtain Co 3 o 4 , while CN201210016504.3 needs to granulate in a spray dryer after preparing CoOOH, which increases equipment and complicates the process
At the same time, the above two patents did not modify and dope the material

Method used

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  • Preparation method for spherical cobalt oxyhydroxide
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Examples

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Embodiment 1

[0029] A kind of preparation method of spherical cobalt oxyhydroxide, by CoSO 4 : MgCl 2 :Al 2 (SO 4- ) 3 The molar ratio is 0.97:0.02:0.005, prepare 1.5mol / L mixed salt solution; mix the mixed salt solution with 3mol / L KOH and NaOH (molar ratio 2:1) mixed solution, 4mol / L H 2 o -2 The aqueous solution was added to the reaction kettle in parallel at a certain flow rate, and stirred and reacted at 50°C and pH=9.2; then centrifuged, washed with pure water, and dried to obtain Co 0.97 Mg 0.02 Al 0.01 OOH. Measured D 50 =15.9 um, AD=1.97 g / cm 3 .

Embodiment 2

[0031] A kind of preparation method of spherical cobalt oxyhydroxide, by CoSO 4 : Fe 2 (SO 4 ) 3 The molar ratio is 0.95:0.025, prepare 1mol / L mixed salt solution; mix the mixed salt solution with 2mol / L NH 4 Add OH solution and high-purity oxygen into the reactor at a certain flow rate, stir and react at 40°C and pH=11.5; then filter, wash with pure water, and dry to obtain Co 0.95 Fe 0.05 OOH, measured D 50 =21.2um, AD=2.16g / cm 3 .

Embodiment 3

[0033] A kind of preparation method of spherical cobalt oxyhydroxide, by Co (NO 3 )- 2 : Mn (NO 3 ) 2 The molar ratio is 0.98:0.02, prepare 2mol / L mixed salt solution; add the mixed salt solution, 6mol / L NaOH solution, and compressed air into the reactor at a certain flow rate, and stir at 65°C and pH=8.3 reaction; then centrifuged, washed with pure water, and dried to obtain Co 0.98 mn 0.02 OOH, measured D 50 =6.7um, AD=1.38g / cm 3 .

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Abstract

The invention discloses a preparation method for spherical cobalt oxyhydroxide. Prepared spherical cobalt oxyhydroxide can be directly used as a raw material for preparation of lithium cobalt oxide. According to the invention, wet processing and doping of trace metal elements are adopted to improve related performance like cycle and voltage of the product; the method is simple and produces no pollution; and the product has the advantages of uniform distribution of doped elements, high density and a good sphericity degree.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and in particular relates to a preparation method of spherical cobalt oxyhydroxide. Background technique [0002] Lithium-ion batteries are currently widely used in small mobile devices such as mobile phones and tablet computers. while LiCoO 2 It is the most widely used lithium battery cathode material in this field. The traditional production method is to sinter tricobalt tetroxide and lithium carbonate as ingredients. New research has found that lithium cobaltate can be produced by directly sintering cobalt oxyhydroxide with lithium carbonate ingredients. This method reduces the intermediate sintering process, lowers the cost and energy consumption, and meets the requirements of green environmental protection. [0003] At the same time, in order to overcome the defects of traditional lithium cobaltate materials, we doped metal ions in the synthes...

Claims

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Application Information

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IPC IPC(8): H01M4/52
CPCH01M4/52H01M10/0525H01M2220/30Y02E60/10
Inventor 宋顺林郑长春刘亚飞
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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