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Preparation method and application of zinc cobaltate/nickel oxide core-shell nanowire array

A technology of nanowire array and zinc cobalt oxide, which is applied in the field of lithium-ion batteries, can solve the problems of high preparation cost, cumbersome process, and complicated nanoarray method, and achieve good rate performance and cycle performance, good electrochemical performance, and high discharge The effect of capacity

Inactive Publication Date: 2014-07-30
XINJIANG UYGUR AUTONOMOUS REGION PROD QUALITY SUPERVISION & INSPECTION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage is that the method of preparing nanoarrays is complicated, and it is difficult to apply on a large scale.
2) Porous electrode, by depositing a layer of transition metal oxide film with nanoporous structure on the surface of nickel foam, the active material can be fully contacted with the electrolyte, and the porous structure is conducive to alleviating the volume change of the active material, achieving cycle performance and The capacity is improved, but the introduction of porous structure reduces the volumetric energy density of the material
This kind of composite material also shows good lithium ion charge and discharge capacity, cycle life and rate performance, but the preparation cost of this method is high and the process is cumbersome
So far, there have been no reports on zinc cobaltate / nickel oxide composites with hierarchical, porous, “core-shell” structures and their related applications

Method used

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  • Preparation method and application of zinc cobaltate/nickel oxide core-shell nanowire array
  • Preparation method and application of zinc cobaltate/nickel oxide core-shell nanowire array
  • Preparation method and application of zinc cobaltate/nickel oxide core-shell nanowire array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of zinc cobaltate / nickel oxide core-shell nanowire arrays:

[0030] a. At room temperature, the soluble zinc salt Zn(NO 3 ) 2 , soluble cobalt salt Co(NO 3 ) 2 , ammonium fluoride and urea in a molar ratio of 1:2:1:5 were added to 25mL water and mixed thoroughly for 10min to obtain a uniform solution. In the reaction kettle, the temperature was raised from 30°C to 120°C, the heating rate was 1°C / min, and the reaction was carried out for 5 hours to obtain a foamed nickel substrate with light green nanowire arrays grown on it;

[0031] b. The substrate grown with cyan nanowire arrays in step a is heated from 30°C to 400°C at a heating rate of 1°C / min, and calcined for 1 hour to obtain a substrate grown with dark brown zinc cobaltate nanowire arrays;

[0032] c. Place the substrate with dark brown zinc cobaltate nanowire arrays grown in step b in a mixed solution with a volume ratio of nickel sulfate: potassium peroxodisulfate: ammonia water = 5: ...

Embodiment 2

[0035] Example 2 Preparation of zinc cobaltate / nickel oxide core-shell nanowire arrays:

[0036] a. At room temperature, the soluble zinc salt Zn(NO 3 ) 2 , soluble cobalt salt Co(CH 2 CH 3 ) 2 , ammonium fluoride and urea in a molar ratio of 1:2:1:6 were added to 25mL water and mixed thoroughly for 10 minutes to obtain a homogeneous solution. Then, the clean nickel substrate was put into a 40mL reaction kettle, and the homogeneous solution was added to In the reaction kettle, the temperature was raised from 30°C to 120°C, the heating rate was 2°C / min, and the reaction was carried out for 8 hours to obtain a nickel sheet substrate with a light green nanowire array grown on it;

[0037] b. Heat up the nickel sheet substrate with cyan nanowire arrays grown in step a at a temperature of 30° C. to 400° C. at a heating rate of 1° C. / min, and bake for 2 hours to obtain a substrate grown with dark brown zinc cobaltate nanowire arrays ;

[0038] c. Place the substrate with dark ...

Embodiment 3

[0041] Example 3 Preparation of zinc cobaltate / nickel oxide core-shell nanowire arrays:

[0042] a. At room temperature, the soluble zinc salt Zn(CH 2 CH 3 ) 2 , soluble cobalt salt CoCl 2 , ammonium fluoride and urea in a molar ratio of 1:2:1.2:6 were added to 25mL of water and mixed thoroughly for 10min to obtain a homogeneous solution. Add it into the reaction kettle, raise the temperature from 30°C to 130°C, the heating rate is 3°C / min, and react for 6 hours to obtain a carbon cloth substrate with light green nanowire arrays grown on it;

[0043] b. Heat up the carbon cloth substrate with cyan nanowire arrays grown in step a at a temperature of 30°C to 400°C at a heating rate of 1°C / min, and bake for 2 hours to obtain a substrate with dark brown zinc cobaltate nanowire arrays grown on it ;

[0044] c. Place the substrate with dark brown zinc cobaltate nanowire arrays grown in step b in a mixed solution with a volume ratio of nickel sulfate: potassium peroxodisulfate: ...

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Abstract

The invention relates to a preparation method and application of a zinc cobaltate / nickel oxide core-shell nanowire array. The method comprises the steps of mixing soluble cobalt salt, soluble zinc salt, ammonium fluoride, urea and water to obtain a uniform solution; after that, feeding the uniform solution into a reaction kettle, putting a clean substrate into the solution in the reaction kettle, and carrying out calcination to obtain the substrate on which a zinc cobaltate nanowire array grows; and mixing nickel sulfate, potassium peroxydisulfate and ammonia water, putting the substrate on which the zinc cobaltate nanowire array grows into the mixed liquid, and carrying out calcination to obtain the zinc cobaltate / nickel oxide core-shell nanowire array. The method is low in manufacturing cost, effective in implementation, feasible and applicable to industrialization; the zinc cobaltate / nickel oxide core-shell nanowire array obtained by the method has the advantages of being high in discharge capacity, rate capability, cycle performance, and the like when being used for preparing a negative electrode of a lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method and application of a zinc cobaltate / nickel oxide core-shell nanowire array, belonging to the technical field of lithium ion batteries. Background technique [0002] As we all know, lithium-ion batteries have been widely used in portable electronic devices and new electric vehicles. With the increasing demand for high energy density chemical power sources, a lot of research has focused on developing non-carbon anode materials with high capacity such as silicon, tin, antimony and their alloys, transition metal oxides, nitrides, etc., to overcome the traditional Carbon anode materials have disadvantages such as low specific capacity and sensitivity to electrolyte. Among them, transition metal oxides are considered to be promising new anode material systems because of their high theoretical capacity and good safety performance. However, transition metal oxides have disadvantages such as obvious volume changes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525B81C1/00B82Y40/00
CPCB82Y40/00H01M4/366H01M4/525H01M10/0525Y02E60/10
Inventor 孙志鹏
Owner XINJIANG UYGUR AUTONOMOUS REGION PROD QUALITY SUPERVISION & INSPECTION RES INST
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