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Preparation method for spherical cobaltosic oxide

A technology of spherical cobalt tetroxide, which is applied in the field of preparation of spherical cobalt trioxide, can solve the problems of environmental pollution, high energy consumption, and difficulty in uniformly dispersing doping elements inside the lattice structure, etc., and achieves environmental friendliness, high density, and good sphericity Effect

Inactive Publication Date: 2014-04-09
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, most of the doping for lithium cobaltate materials is concentrated on the dry process, such as the technical solutions disclosed in CN201110314401.0 and CN200910264194.5, which are mixed and sintered cobalt tetroxide, metal oxide and lithium carbonate to obtain doped cobaltate Lithium method, but it is difficult to achieve uniform dispersion of doping elements in the lattice structure in such methods
[0005] In terms of wet method, in the process of doping magnesium, aluminum and titanium with cobalt carbonate disclosed in patent CN20121011485.5, ammonium bicarbonate needs to be used as a complexing and precipitating agent. High energy consumption and pollution to the environment; in the preparation process of cobalt tetroxide introduced in CN200810110753.2, ammonia water is added as a complexing agent, which will pollute the environment

Method used

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  • Preparation method for spherical cobaltosic oxide
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  • Preparation method for spherical cobaltosic oxide

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Effect test

Embodiment 1

[0032] A kind of preparation method of spherical tricobalt tetroxide, by CoCl 2 : MgSO 4 : NbC 2 o 4 The molar ratio is 0.98:0.01:0.01, and a 3.3mol / L mixed liquid is prepared; the mixed liquid, 3mol / L LiOH solution, and 2mol / L NaClO solution are added to the reactor at a certain flow rate in parallel. =7.5 under the condition of stirring and reacting; then filtered and washed with pure water to obtain the intermediate product, which was calcined at 400°C for 20h to obtain (Co 0.98 Mg 0.01 Nb 0.01 ) 3 o 4 , measured D 50 =9.5um, AD=1.24g / cm 3 .

Embodiment 2

[0034] A kind of preparation method of spherical cobalt trioxide, by CoSO 4 :Al 2 (SO 4 ) 3 The molar ratio is 0.95:0.025, prepare 1mol / L mixed salt solution; mix the mixed solution with 2mol / L NH 4 OH solution and high-purity oxygen were added to the reactor at a certain flow rate, and the reaction was stirred at 40°C and pH=10.8; then filtered and washed with pure water to obtain an intermediate product, which was calcined at 600°C for 10 h to obtain (Co 0.95 Al 0.05 ) 3 o 4 , measured D 50 =20.5um, AD=1.43g / cm 3 .

Embodiment 3

[0036] A kind of preparation method of spherical tricobalt tetroxide, by Co (NO 3 )- 2 : Mn (NO 3 ) 2 : n-ZrO 2 The molar ratio is 0.96:0.02:0.02, prepare 2mol / L mixed liquid; put the mixed liquid, 6mol / L NaOH solution and compressed air into the reactor at a certain flow rate, and stir at 70°C and pH=8.0 reaction; then centrifuged, washed with pure water to obtain an intermediate product, and calcined at 800°C for 5h to obtain (Co 0.96 mn 0.02 Zr 0.02 ) 3 o 4 , measured D 50 =6.7um, AD=1.08g / cm 3 .

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Abstract

The invention discloses a preparation method for spherical cobaltosic oxide. The preparation method comprises the steps of mixing a cobalt salt with other trace metal elements; adding a precipitator and an oxidant in a flowing manner to obtain a synthetic product; and subjecting the synthetic product to solid-liquid separation, washing and sintering to obtain the spherical cobaltosic oxide material. The method disclosed by the invention is simple in process and convenient for operation; and the obtained product is uniform in distribution of doping elements, narrow in particle size distribution, good in degree of sphericity, and high in density.

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 trioxide. 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 cathode material for lithium batteries in this field. During the cycle, pure-phase lithium cobalt oxide materials generally only intercalate and extract 50% of lithium ions. Once the limit is exceeded, overcharging will cause the structure to undergo phase transition and collapse. , Lattice depletion of oxygen will lead to rapid attenuation of the cycle, and there are also potential safety hazards. [0003] In order to overcome the defects of traditional lithium cobalt oxide materials, people improved its structure by doping metal ions. These metal elements stabilized the layered structu...

Claims

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Application Information

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IPC IPC(8): H01M4/52C01G51/04
CPCC01G51/04H01M4/362H01M4/483H01M4/502H01M4/523H01M10/0525Y02E60/10
Inventor 郑长春宋顺林刘亚飞
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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