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Cobalt oxide anode material, amorphous carbon coated cobalt oxide anode material and preparation method and application of cobalt oxide anode material and amorphous carbon coated cobalt oxide anode material

A technology of tricobalt tetroxide and negative electrode materials, which is applied in the direction of cobalt oxide/cobalt hydroxide, battery electrodes, electrical components, etc., which can solve the problems of unsatisfactory high-power battery rate performance, unsatisfactory capacity and cycle performance, and capacity decline. Excellent performance, low production cost, and the effect of increasing electronic conductivity

Inactive Publication Date: 2012-09-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process steps of this method are simple, and the particles of the prepared material are uniform, but the capacity and cycle performance at high rates are not ideal, especially when the charge and discharge rate is 800mA / g, the capacity drops rapidly, which cannot meet the high rate performance requirements of high-power batteries. Require

Method used

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  • Cobalt oxide anode material, amorphous carbon coated cobalt oxide anode material and preparation method and application of cobalt oxide anode material and amorphous carbon coated cobalt oxide anode material
  • Cobalt oxide anode material, amorphous carbon coated cobalt oxide anode material and preparation method and application of cobalt oxide anode material and amorphous carbon coated cobalt oxide anode material
  • Cobalt oxide anode material, amorphous carbon coated cobalt oxide anode material and preparation method and application of cobalt oxide anode material and amorphous carbon coated cobalt oxide anode material

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Effect test

Embodiment 1

[0036] 1) 2.91g of cobalt nitrate hexahydrate and 4.2057g of hexamethylenetetramine were dissolved in 70g of deionized water to obtain an aqueous solution containing cobalt nitrate hexahydrate and hexamethylenetetramine, wherein, containing cobalt nitrate hexahydrate The concentration of cobalt nitrate hexahydrate in the aqueous solution with hexamethylenetetramine is 0.143mol / L, and the concentration of hexamethylenetetramine is 0.429mol / L;

[0037] 2) Pretreat the foamed nickel sheet: select a foamed nickel sheet (commercially available) with a length of 4.5cm, a width of 2.0cm, and a thickness of 2mm, apply a pressure of 10MPa and keep the foamed nickel sheet for 30s to flatten the foamed nickel sheet, and then use ethanol and Clean with acetone, and protect one side of the nickel foam sheet with insulating glue after cleaning.

[0038] In the hydrothermal reaction kettle, place the pretreated foamed nickel sheet in the aqueous solution containing cobalt nitrate hexahydrate...

Embodiment 2

[0046] 1) 2.91g of cobalt nitrate hexahydrate and 4.2057g of hexamethylenetetramine were dissolved in 70g of deionized water to obtain an aqueous solution containing cobalt nitrate hexahydrate and hexamethylenetetramine, wherein, containing cobalt nitrate hexahydrate The concentration of cobalt nitrate hexahydrate in the aqueous solution with hexamethylenetetramine is 0.143mol / L, and the concentration of hexamethylenetetramine is 0.429mol / L;

[0047] 2) Pretreat the foamed nickel sheet: select a foamed nickel sheet (commercially available) with a length of 4.5cm, a width of 2.0cm, and a thickness of 2mm, apply a pressure of 10MPa and keep the foamed nickel sheet for 30s to flatten the foamed nickel sheet, and then use ethanol and Clean with acetone, and protect one side of the nickel foam sheet with insulating glue after cleaning.

[0048] In the hydrothermal reaction kettle, place the pretreated foamed nickel sheet in the aqueous solution containing cobalt nitrate hexahydrate...

Embodiment 3

[0055] 1) 2.91g of cobalt nitrate hexahydrate and 4.2057g of hexamethylenetetramine were dissolved in 70g of deionized water to obtain an aqueous solution containing cobalt nitrate hexahydrate and hexamethylenetetramine, wherein, containing cobalt nitrate hexahydrate The concentration of cobalt nitrate hexahydrate in the aqueous solution with hexamethylenetetramine is 0.143mol / L, and the concentration of hexamethylenetetramine is 0.429mol / L;

[0056] 2) Pretreat the foamed nickel sheet: select a foamed nickel sheet (commercially available) with a length of 4.5cm, a width of 2.0cm, and a thickness of 2mm, apply a pressure of 10MPa and keep the foamed nickel sheet for 30s to flatten the foamed nickel sheet, and then use ethanol and Clean with acetone, and protect one side of the nickel foam sheet with insulating glue after cleaning.

[0057] In the hydrothermal reaction kettle, place the pretreated foamed nickel sheet in the aqueous solution containing cobalt nitrate hexahydrate...

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Abstract

The invention discloses a preparation method of a cobalt oxide anode material or an amorphous carbon coated cobalt oxide anode material, which comprises the following steps of: placing a conductive metal substrate in aqueous solution containing soluble cobalt salt and hexamethylene tetramine and carrying out heat preservation for 3h to 12h at a temperature of 80 DEG C to 150 DEG C to obtain the conductive metal substrate on which a cobalt hydroxide thin film is deposited; calcining the conductive metal substrate for 1h to 3h at a temperature of 200 DEG C to 400 DEG C to obtain the cobalt oxide anode material; and soaking the cobalt oxide anode material into aqueous solution of glucose, drying and calcining for 1h to 8h at a temperature of 300 DEG C to 500 DEG C to obtain the amorphous carbon coated cobalt oxide anode material. The preparation method has a simple preparation process and good reproducibility, is easy to implement, has an environmental-friendly production process and low cost and is beneficial to industrial production. The invention also provides the cobalt oxide anode material and the amorphous carbon coated cobalt oxide anode material. The cobalt oxide anode material and the amorphous carbon coated cobalt oxide anode material have high capacity retention ratios and good high-rate capabilities and are particularly suitable to use as a cathode electrode of a lithium ion battery.

Description

technical field [0001] The invention relates to the field of preparation of electrode materials, in particular to a negative electrode material of tricobalt tetroxide, an amorphous carbon-coated negative electrode material of tricobalt tetroxide, and a preparation method and application thereof. Background technique [0002] The rapid development of the information society puts forward high requirements for mobile power sources such as safety, environmental protection, low cost, high specific energy and long cycle life. Therefore, lithium-ion batteries with many advantages have become a new type of chemical power source with great potential in the 21st century. Graphitized carbon materials, as the current commercial anode materials, have been difficult to meet the application requirements of high-performance batteries, so researchers at home and abroad are committed to developing anode materials with higher capacity, long cycle life, and high safety performance. Among them, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04H01M4/52H01M4/131
CPCY02E60/10
Inventor 俞迎霞王秀丽涂江平谷长栋
Owner ZHEJIANG UNIV
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