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Co3O4 nano hollow sphere material and preparation method and application thereof

A hollow sphere and nanotechnology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of increased charge-discharge cycle life, irreversible capacity decay, etc. Effects of chemical actions

Inactive Publication Date: 2010-10-20
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the biggest problem facing lithium-ion battery anode materials is the significant attenuation of the first irreversible capacity and the improvement of charge-discharge cycle life.

Method used

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  • Co3O4 nano hollow sphere material and preparation method and application thereof
  • Co3O4 nano hollow sphere material and preparation method and application thereof
  • Co3O4 nano hollow sphere material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Get 5.29g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), 1.28g hexamethylenetetramine (HMT, C 6 h 12 N 4 ), 1.79g sodium citrate (C 6 h 5 Na 3 o 7 2H 2 O) was added to 50ml deionized water, Co(NO 3 ) 2 :HMT:C 6 h 5 Na 3 o 7 The molar ratios are 6:3:2, and the entire addition process is carried out under magnetic stirring. After stirring for 60 minutes, the entire mixed solution was moved into a polytetrafluoroethylene-lined autoclave with a filling degree of 60%, reacted at a certain temperature (95° C.) for 23.5 hours, and then cooled naturally. The product was centrifuged, washed three times with deionized water and absolute ethanol, and dried at 60°C to obtain a powdery mixed precursor; the powdery mixed precursor was heat-treated at 290°C for 3 hours in an air atmosphere to obtain Final Co 3 o 4 Material.

Embodiment 2

[0070] Get 5.29g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), 2.51g hexamethylenetetramine (HMT, C 6 h 12 N 4 ), 1.79g sodium citrate (C 6 h 5 Na 3 o 7 2H 2 O) was added to 60ml deionized water, Co(NO 3 ) 2 :HMT:C 6 h 5 Na 3 o 7 The molar ratios are 3:3:1 respectively, and the whole adding process is carried out under magnetic stirring. After stirring for 30 minutes, the entire mixed solution was moved into a polytetrafluoroethylene-lined autoclave with a filling degree of 75%, reacted at a certain temperature (100° C.) for 24 hours, and then cooled naturally. The product was centrifuged, washed three times with deionized water and absolute ethanol, and dried at 70°C to obtain a powdery mixed precursor; the powdery mixed precursor was heat-treated at 300°C for 3 hours in an air atmosphere to obtain Final Co 3 o 4 Material.

Embodiment 3

[0072] Get 5.29g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), 5.10g hexamethylenetetramine (HMT, C 6 h 12 N 4 ), 1.17g citric acid (C 6 h 8 o 7 ) into 60ml deionized water, Co(NO 3 ) 2 :HMT:C 6 h 8 o 7 The molar ratios are 3:6:1 respectively, and the whole adding process is carried out under magnetic stirring. After stirring for 45 minutes, the entire mixed solution was moved into a polytetrafluoroethylene-lined autoclave with a filling degree of 70%, reacted at a certain temperature (100° C.) for 24 hours, and then cooled naturally. The product was centrifuged, washed three times with deionized water and absolute ethanol, and dried at 80°C to obtain a powdery mixed precursor; the powdery mixed precursor was heat-treated at 300°C for 3 hours in an air atmosphere to obtain Final Co 3 o 4 Material.

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Abstract

The invention provides a Co3O4 nano hollow sphere material and a preparation method and the application thereof. The preparation method of the Co3O4 nano hollow sphere material comprises the following steps of: mixing cobalt salt, surface active agent, precipitant with water according to stoichiometric ratio; putting mixed solution into a reaction kettle to perform hydro-thermal reaction, washing and drying to obtain a powdered mixed precursor; and heat treating the precursor in air to finally obtain the Co3O4 nano hollow sphere material. The obtained Co3O4 nano hollow sphere material has a regular surface nano piece layer and an internal hollow network structure, has a better electrochemical behavior, can be used for a cathode of a rechargeable lithium ion battery, can guarantee the electrolyte to be sufficiently permeated, can provide more electric active points with an increased contact surface, guarantees the lithium ion to better perform an embedding / withdrawing electrochemical behavior, enlargers the specific surface area, and improves the lithium storage capability. The internal network structure also shortens the reaction path of the lithium ion, i.e. shortens the conduction path of the e-and the Li+, thereby improving the characteristic of multiplying power.

Description

technical field [0001] The invention relates to a Co 3 o 4 Nano hollow sphere material and its preparation method. technical background [0002] Lithium-ion batteries have attracted much attention due to their high energy density and are currently the main power source for electrical devices. However, due to problems such as energy attenuation of lithium-ion batteries, it has become the main factor that plagues the application of lithium-ion batteries. Lithium metal has once become an ideal negative electrode material for lithium ion electrode systems due to its high capacity, low potential and other excellent properties. However, due to factors such as the growth of lithium dendrites and the formation of passivation layers during the cycle, the intercalation / extraction behavior of lithium ions is hindered, resulting in a rapid decline in the capacity of lithium-ion batteries and unstable cycles. Through the continuous research of scientific researchers, the research foc...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 刘艳武英
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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