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A kind of copper molybdenum dioxide graphene composite material and its preparation method and application

A molybdenum dioxide and composite material technology, applied in secondary batteries, electrochemical generators, structural parts, etc., can solve the problems of low reversible capacity, poor cycle stability, etc., and achieve good Coulomb efficiency, low cost, and good electrochemical performance. active effect

Active Publication Date: 2019-09-03
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0008] The purpose of the present invention is to solve the above problems in the prior art, to provide a copper dioxide molybdenum graphene composite material and its preparation method and application, the prepared composite material overcomes the problems of low reversible capacity and poor cycle stability of a single material , has high lithium storage capacity and good Coulombic efficiency, and the preparation process of the present invention is simple, low in cost, and environmentally friendly, which provides convenient conditions for its practical application

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  • A kind of copper molybdenum dioxide graphene composite material and its preparation method and application
  • A kind of copper molybdenum dioxide graphene composite material and its preparation method and application
  • A kind of copper molybdenum dioxide graphene composite material and its preparation method and application

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[0032] see Figure 1-3 , the preparation method of copper-molybdenum-molybdenum-graphene composite material of the present invention, comprises the following steps:

[0033] 1) Add ammonium molybdate tetrahydrate and copper acetate dihydrate into the sodium hydroxide aqueous solution with a concentration of 0.001-0.005mol / L according to the molar ratio of (1-3):1, and heat it at a temperature of 120-160°C React for 3-5 hours, and then perform centrifugation, washing and drying to obtain copper molybdate nanoparticles and product A;

[0034] 2) preparing a graphene oxide aqueous solution with a concentration of 0.5 to 1 mol / L;

[0035] 3) Mix the product A and the graphene oxide aqueous solution uniformly according to the mass ratio of 20:(1~20), stir and sonicate for 0.5~1h until the mixture is uniform, and then rotate the product at a temperature of 60~80°C , dry treatment, obtain product B;

[0036] 4) Calcining the product B under an argon atmosphere at 500-800° C. for 1...

Embodiment 1

[0039] 1) Ammonium molybdate tetrahydrate and copper acetate dihydrate were dissolved in 40 mL, 0.001 mol / L sodium hydroxide aqueous solution according to the molar ratio of 1:1, hydrothermally reacted at 120°C for 3 hours, the product was centrifuged, washed and dried to obtain product A;

[0040] 2) preparing a graphene oxide aqueous solution with a concentration of 0.5 mol / liter to obtain product B;

[0041] 3) Take A and component B with a mass ratio of 1:1 and mix evenly, stir and sonicate for 0.5 hours, and the product is rotary evaporated and dried at 60°C.

[0042] 4) Calcining the product at 500° C. for 1 hour under an argon atmosphere to obtain a copper-molybdenum-molybdenum-graphene composite material.

Embodiment 2

[0044] 1) Ammonium molybdate tetrahydrate and copper acetate dihydrate were dissolved in 40mL, 0.005 mol / L sodium hydroxide aqueous solution at a molar ratio of 1:1, hydrothermally reacted at 140°C for 3 hours, the product was centrifuged, washed and dried to obtain product A;

[0045] 2) preparing a graphene oxide aqueous solution with a concentration of 1 mol / liter to obtain product B;

[0046] 3) Take A and component B with a mass ratio of 2:1 and mix evenly, stir and sonicate for 0.5 hours, and the product is rotary evaporated and dried at 80°C.

[0047] 4) Calcining the product at 800° C. for 2 hours under an argon atmosphere to obtain a copper-molybdenum-molybdenum-graphene composite material.

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Abstract

The invention discloses a method for preparing a copper-doped molybdenum oxide composite material as a lithium battery negative electrode material by using a pyrolysis process and by using graphene as a matrix. The preparation method comprises: dispersing copper molybdate prepared through a hydrothermal method and graphene oxide in an aqueous solution according to a certain ratio, carrying out stirring and ultrasonic treatment for several hours, carrying out rotary evaporation and drying on the product, and calcining in an argon atmosphere. According to the present invention, the preparation method is simple, the raw materials are easy to obtain, and the electrochemical activity of the product as the lithium battery negative electrode material is good, wherein the first Coulomb efficiency is 94%, the discharge specific capacity achieves 804 mAh / g after the charge and discharge cycle is performed 65 times, and the Coulomb efficiency is 99%.

Description

[0001] 【Technical field】 [0002] The invention belongs to the intersecting technical field of inorganic materials and energy materials, and relates to a copper-molybdenum-dioxide-graphene composite material and a preparation method and application thereof. [0003] 【Background technique】 [0004] Nanocomposite material is a new type of material that has emerged with the development of material science. It is a multiphase solid material that is composed of two or more materials with different properties through various processes. In the study of lithium-ion battery anode materials, transition metal oxides are ideal lithium-ion battery anode materials due to their good electrochemical activity, low price, abundant resources, and environmental friendliness. The combination of carbon materials and various metal oxides can further improve the electrochemical activity of composite electrode materials such as specific capacity and cycle performance. [0005] Due to its special prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 张利锋贺文杰郭守武
Owner SHAANXI UNIV OF SCI & TECH
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