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Cobaltosic oxide multi-shell hollow sphere cathode material for lithium ion battery and preparation method thereof

A technology of cobalt tetroxide and negative electrode material, which is applied in battery electrodes, battery pack components, circuits, etc., can solve the problems of low specific capacitance, difficulty in preparing multi-shell layers with high yield, and short cycle life, etc. The effect of high current discharge and cycle performance improvement

Active Publication Date: 2013-08-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of this kind of material are: the actual specific capacitance is relatively low, and the cycle life is short
However, due to the large radius of hydrated cobalt ions, it is difficult to prepare multi-shelled Co with high yield and good purity by existing methods. 3 o 4 hollow ball

Method used

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  • Cobaltosic oxide multi-shell hollow sphere cathode material for lithium ion battery and preparation method thereof
  • Cobaltosic oxide multi-shell hollow sphere cathode material for lithium ion battery and preparation method thereof
  • Cobaltosic oxide multi-shell hollow sphere cathode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The sucrose aqueous solution with a concentration of 1.5M was hydrothermally reacted in an autoclave at 200°C for about 130min, cooled naturally, filtered with suction, washed with water and ethanol several times, and dried in an oven at 80°C for 24h. The ball diameter is about 3 μm.

[0028] Disperse carbon sphere template evenly in 1M Co(Ac) 2 4H 2 O solution, wherein the ratio of water to ethanol in the solvent is 1:3. At 30°C, stir for 6h, filter with suction, wash with deionized water for 3 times, put it in an oven at 80°C for 12h, and place the obtained solid powder in In a muffle furnace, heat up to 500°C at 2°C / min, calcine at a constant temperature for 1 hour, and naturally cool to obtain a three-shell Co 3 o 4 Hollow sphere, the shell size is about 864.1nm±21.4nm.

[0029] Three-shell Co with a weight ratio of 5:3:2 3 o 4 Hollow spheres, acetylene black and PVDF are uniformly dispersed in NMP solvent to form a slurry. Apply the slurry evenly on the copp...

Embodiment 2

[0032] The sucrose aqueous solution with a concentration of 1.5M was hydrothermally reacted in an autoclave at 200°C for about 130min, cooled naturally, filtered with suction, washed with water and ethanol several times, and dried in an oven at 80°C for 12h. The ball diameter is about 3 μm.

[0033] The carbon sphere template was uniformly dispersed in 3M Co(NO 3 ) 2 ·6H 2 In O solution, the solvent is deionized water. At 50°C, stir for 4 hours, filter with suction, wash with deionized water for 5 times, dry in an oven at 80°C for 24 hours, place the obtained solid powder in a muffle furnace, heat up to 500°C at 0.5°C / min, and calcine at a constant temperature 3h, the single-shell Co was obtained after natural cooling 3 o 4 Hollow sphere, the shell size is about 859.1nm±22.4nm.

[0034] The single-shell Co with a weight ratio of 8:1:1 3 o 4 Hollow spheres, acetylene black and PVDF are uniformly dispersed in NMP solvent to form a slurry. Apply the slurry evenly on the ...

Embodiment 3

[0037] The sucrose aqueous solution with a concentration of 1.5M was hydrothermally reacted in an autoclave at 200°C for about 130min, cooled naturally, filtered with suction, washed with water and ethanol several times, and dried in an oven at 80°C for 12h. The ball diameter is about 3 μm.

[0038] Disperse carbon sphere template evenly in 3M CoCl 2 4H 2 O solution, the solvent is ethanol, at 20°C, stir for 12h, then filter with suction, wash with deionized water for 3 times, put it in an oven at 80°C for 12h, put the obtained solid powder in a muffle furnace, and heat it at 5°C / Min was raised to 500°C, and then calcined at a constant temperature for 1 h, and after natural cooling, the double-shelled Co 3 o 4 Hollow sphere, the shell size is about 858.6nm±21.3nm.

[0039] Double shell Co with a weight ratio of 7:2:1 3 o 4 Hollow spheres, acetylene black and PVDF are uniformly dispersed in NMP solvent to form a slurry. Apply the slurry evenly on the copper foil. After ...

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Abstract

The invention provides a cobaltosic oxide multi-shell hollow sphere cathode material for a lithium ion battery and a preparation method thereof. The method comprises the steps of: taking a carbon sphere prepared by a hydrothermal method as a template; controlling the quantity of cobalt ions in the carbon sphere and the entering depth thereof by controlling the ratio of water to ethanol in a cobalt salt solution, the temperature of the solution and the adsorption capacity of the carbon sphere; and preparing single-shell, dual-shell, tri-shell and four-shell cobaltosic oxide hollow spheres. The lithium ion battery of taking the cobaltosic oxide multi-shell hollow sphere as a cathode has large specific surface area and a plurality of lithium ion storage sites; the specific capacitance is improved; meanwhile, the appropriate multi-shell cavity structure not only can adjust the electrode structure and volume change, but also can effectively reduce the transmission distance between the lithium ion and electrons. Thus, the cycling performance and rapid charge and discharge capacity are obviously improved. The method disclosed by the invention is convenient and concise to operate, and high in controllability, and has a wide application prospect; and the performance of the lithium ion battery can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular, the invention relates to a tricobalt tetroxide (Co 3 o 4 ) Multi-shell hollow sphere anode material and preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, small size, light weight, high energy density, no memory effect, no pollution, small self-discharge, long cycle life, etc., and have been extensively researched and developed rapidly. At present, it has been widely used in many fields such as electronic products, electric vehicles, aerospace and national defense, and has developed into one of the most ideal battery energy sources in the 21st century. [0003] In 2000, P. Poizot et al. reported that nano-sized 3d transition metal oxides (MO, M is Co, Ni, Fe, Cu) have excellent electrochemical properties as anode materials for lithium-ion batteries (document: Poizot P, Laruelle S , Grugeon S, ...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M2/10
CPCY02E60/122Y02E60/10
Inventor 王丹王江艳毛丹
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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