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Preparation method and application of silver vanadate/vanadium oxide one-dimensional composite nano-electrode material

A nano-electrode, vanadium oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficulty in obtaining nano-sized materials, low material conductivity, poor cycle stability, etc., and achieve high specific capacity and low reaction temperature , the effect of mild reaction conditions

Inactive Publication Date: 2010-08-18
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The invention provides a preparation method and application of a silver vanadate / vanadium oxide one-dimensional composite nano-electrode material, which can solve the problems of high energy consumption, long reaction cycle, product components and particle size in the preparation method of the existing lithium battery cathode material It is difficult to control the shape and shape, and it is difficult to obtain nano-sized materials, and the conductivity of the material is low and the cycle stability is poor.

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  • Preparation method and application of silver vanadate/vanadium oxide one-dimensional composite nano-electrode material
  • Preparation method and application of silver vanadate/vanadium oxide one-dimensional composite nano-electrode material

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Embodiment 1

[0032] A preparation method of a silver vanadate / vanadium oxide one-dimensional composite nanostructured lithium battery positive electrode material, comprising the following sequential steps:

[0033] (1) 0.18g vanadium pentoxide is dissolved in the hydrogen peroxide that mass fraction is 30%, adds 20mL deionized water and obtains transparent peroxovanadic acid solution;

[0034] (2) 0.05g silver nitrate is dissolved in 40mL deionized water;

[0035] (3) Pour the silver nitrate solution into the perovanadic acid solution, mix and fully stir, pour it into a 100mL polytetrafluoroethylene-lined autoclave, and keep it warm at 120°C for about 24h;

[0036] (4) After the reaction product is centrifuged, washed and dried, Ag 0.33 V 2 o5 / V 2 o 5 One-dimensional nanoribbons. like figure 1 (D), its XRD pattern shows that the diffraction peak is wider, the crystallinity of the product is not very high, and the diffraction peak can be attributed to silver vanadate Ag 0.33 V 2 o ...

Embodiment 2

[0038] A preparation method of a silver vanadate / vanadium oxide one-dimensional composite nanostructured lithium battery positive electrode material, comprising the following sequential steps:

[0039] (1) 0.243g sodium metavanadate is dissolved in 30% hydrogen peroxide, and 20mL deionized water is added to obtain a transparent perovanadic acid solution;

[0040] (2) Disperse 0.077g silver oxide into 40mL deionized water;

[0041] (3) Pour the silver salt solution into the perovanadic acid solution, mix and fully stir, pour it into a 100mL polytetrafluoroethylene-lined autoclave, and keep it warm at 200°C for about 16h;

[0042] (4) After the reaction product is centrifuged, washed and dried, Ag 0.33 V 2 o 5 / V 2 o 5 One-dimensional nanoribbons. From the SEM photos ( figure 2 ) It can be seen that the surface of the synthesized one-dimensional vanadium oxide-silver vanadate composite nanostructure is very smooth, the length of the nanobelt is about a dozen microns, the...

Embodiment 3

[0044] A preparation method of a silver vanadate / vanadium oxide one-dimensional composite nanostructured lithium battery positive electrode material, comprising the following sequential steps:

[0045] (1) 0.234g ammonium metavanadate is dissolved in hydrogen peroxide, and 20mL deionized water is added to obtain a transparent perovanadic acid solution;

[0046] (2) Disperse 0.055g of silver acetate in 40mL of deionized water;

[0047] (3) Pour the silver salt solution into the perovanadic acid solution, mix and fully stir, pour it into a 100mL polytetrafluoroethylene-lined autoclave, and keep it warm at 160°C for about 20h;

[0048] (4) After the reaction product is centrifuged, washed and dried, Ag 0.33 V 2 o 5 / V 2 o 5 One-dimensional nanoribbons. Electrochemical tests show that the silver vanadate / vanadium oxide one-dimensional composite nanostructure synthesized by this method has high discharge specific capacity and good cycle stability at different current densitie...

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Abstract

The invention provides a preparation method and application of a silver vanadate / vanadium oxide one-dimensional composite nano-electrode material, which can solve the problems of high energy consumption, difficult control of components, grain diameter and appearance of a product, low electrical conductivity and poorer cyclical stability of a traditional lithium battery anode material. The invention adopts a one-step hydrothermal method which comprises the following steps of: 1. dissolving vanadium salt into 10-30 percent hydrogen peroxide to obtain a transparent peroxovanadate solution; 2. dispersing the vanadium salt into deionized water; 3. pouring a vanadium salt mixture into the peroxovanadate solution, mixing, fully stirring and pouring into a hydrothermal reaction kettle for hydrothermal reaction to obtain a product; and 4. obtaining the silver vanadate / vanadium oxide one-dimensional composite nano-electrode material through centrifugalizing, washing and drying the product. The preparation process of the invention is simple, the size of the product and the doping amount of silver are easy to control, the product has larger yield and is pure, and both the specific capacity and the cyclical stability of the silver vanadate / vanadium oxide one-dimensional composite nano-electrode material as the lithium battery anode material are markedly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery production, and relates to a lithium battery cathode material, in particular to a preparation method and application of a silver vanadate / vanadium oxide one-dimensional composite nano electrode material. Background technique [0002] Vanadium oxide is an important cathode material for lithium-ion batteries. Compared with other cathode materials, it has the characteristics of high theoretical specific capacity and low raw material price. However, the lithium ion diffusion coefficient and conductivity of vanadium pentoxide are low, resulting in slow charge and discharge rates and poor cycle stability, which largely limits the use of vanadium pentoxide as a cathode material for lithium batteries. commercial applications. Therefore, how to improve the electrochemical performance of vanadium pentoxide positive electrode materials and improve the actual specific capacity and cycle stability of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/62H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李桂村武卫忠彭红瑞陈克正
Owner QINGDAO UNIV OF SCI & TECH
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