V2O5 nanoparticle/graphene lithium ion battery positive pole material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of lithium-ion battery positive electrode materials and their preparation, and can solve problems such as limited electrochemical performance

Inactive Publication Date: 2014-04-23
CHINA JILIANG UNIV
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Problems solved by technology

But the nanostructured V 2 o 5 The electrochemical performance (including cycle performance and rate perfor

Method used

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  • V2O5 nanoparticle/graphene lithium ion battery positive pole material and preparation method thereof
  • V2O5 nanoparticle/graphene lithium ion battery positive pole material and preparation method thereof
  • V2O5 nanoparticle/graphene lithium ion battery positive pole material and preparation method thereof

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Embodiment 1

[0024] According to the literature (J.Am.Chem.Soc., 2008, 130, 5856-5857), the modified Hummer method was used to synthesize graphite oxide from natural graphite.

[0025] Disperse 40 mg of graphite oxide powder in N,N-dimethylformamide (DMF) and sonicate for 30 min to form a stable graphene oxide (GO) dispersion (1 mg / mL). Weigh 1g vanadium (IV) acetylacetonate (C 5 h 8 o 2 V) Disperse in the above GO dispersion and stir for 1 hour. A homogeneous and stable solution is formed. It was transferred to a 50ml hydrothermal kettle and reacted at 200°C for 20 hours. After the solution was cooled to room temperature, the obtained black precipitate was collected by centrifugation, washed several times with alcohol and deionized water, and dried at 80°C for 6 hours. The dried precipitate was calcined at 400°C for 2 hours with a heating rate of 10°C / min to obtain V 2 o 5 -GE lithium ion battery cathode material.

[0026] The specific steps of button battery assembly are as follo...

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Abstract

The invention relates to a V2O5 nanoparticle/graphene (V2O5-GE) lithium ion battery positive pole material and a preparation method thereof, belonging to the field of lithium ion battery positive pole materials. The V2O5-GE positive pole material is synthesized by simple hydrothermal reaction, and is a nano composite positive pole material formed by distributing 20-40nm V2O5 nanoparticles on the surface of two-dimensional transparent graphene sheets. Compared with the V2O5 nanoparticles, due to the introduction of the graphene, the V2O5-GE nano composite material has the advantages of excellent electrochemical properties, higher reversible specific capacity, high loop stability and higher rate capability. The graphene nanosheets perform the function of the conductive reticular structure, and improve the conductivity of the composite material electrode; the flexible reticular structure maintains the stability of the electrode material structure and inhibits the particle agglomeration and volume expansion, thereby improving the electrochemical properties of the V2O5 nanoparticles; and the positive pole material is hopeful to be used as a high-performance lithium ion battery positive pole material.

Description

technical field [0001] The present invention relates to a kind of positive electrode material of lithium ion battery and preparation method thereof, specifically V 2 o 5 Nanoparticles / graphene (V 2 o 5 -GE) Lithium-ion battery cathode material and preparation method thereof. Background technique [0002] As a green and reversible energy source, lithium-ion batteries can be widely used in portable electronic devices and transportation facilities. Most of the current research focuses on improving the specific energy and service life of batteries. Since the lithium storage performance of lithium-ion batteries largely depends on the cathode materials, many studies have been devoted to the development of new cathode materials to improve the electrochemical performance of lithium-ion batteries. Among many cathode materials, V 2 o 5 Due to their low price, abundant reserves, facile synthesis, and relatively high energy efficiency and specific capacity, they have attracted at...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48B82Y30/00B82Y40/00
CPCB82Y30/00H01M4/362H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 陈达王东方平广兴范美强秦来顺吕春菊田光磊舒康颖葛其胜石磊
Owner CHINA JILIANG UNIV
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