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Preparation of cu by a microwave hydrothermal method 2 v 2 o 7 -cuo nanocomposite approach

A nanocomposite, microwave hydrothermal method technology, which is applied in the field of preparing Cu2V2O7-CuO nanocomposite by microwave hydrothermal method, can solve the problems of affecting battery cycle stability, generating large stress, large product size, etc., and achieving the preparation cycle Short, crystalline, reproducible results

Active Publication Date: 2020-07-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a semiconductor material, Cu 2 V 2 o 7 The synthesis is generally sintered by solid-state method, the reaction time is long, the energy consumption is high, and the size of the synthesized product is large, which will generate large stress during the battery cycle, which will affect the cycle stability of the battery.

Method used

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  • Preparation of cu by a microwave hydrothermal method <sub>2</sub> v <sub>2</sub> o <sub>7</sub> -cuo nanocomposite approach
  • Preparation of cu by a microwave hydrothermal method <sub>2</sub> v <sub>2</sub> o <sub>7</sub> -cuo nanocomposite approach
  • Preparation of cu by a microwave hydrothermal method <sub>2</sub> v <sub>2</sub> o <sub>7</sub> -cuo nanocomposite approach

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Press V 5+ and Cu 2+ With a molar ratio of 1:0.5, analytically pure V 2 o 5 The powder is dispersed in 0.1mol / L CuCl 2 in aqueous solution;

[0020] 2) Under magnetic stirring, use ammonia water to adjust the pH of the solution to 7, and continue stirring to form a reaction precursor;

[0021] 3) Pour the reaction precursor into a microwave hydrothermal reaction kettle. After the equipment is ready, place it in a microwave hydrothermal instrument with a power of 400W, and conduct a microwave hydrothermal reaction at 100°C for 1 hour. After the reaction is completed and the instrument is automatically cooled, vacuum pump filtered, washed three times with deionized water and absolute ethanol, placed in a vacuum oven at 250°C, and dried for 2 hours to obtain Cu 2 V 2 o 7 -CuO nanocomposites.

Embodiment 2

[0023] 1) Press V 5+ and Cu 2+ With a molar ratio of 1:2, analytically pure V 2 o 5 Powder dispersed in 0.5mol / L CuCl 2 in aqueous solution;

[0024] 2) Under magnetic stirring, use ammonia water to adjust the pH of the solution to 8, and continue stirring to form a reaction precursor;

[0025] 3) Pour the reaction precursor into a microwave hydrothermal reaction kettle. After the equipment is ready, place it in a microwave hydrothermal instrument with a power of 400W, and conduct a microwave hydrothermal reaction at 150°C for 2 hours. After the reaction is completed and the instrument is automatically cooled, vacuum pump filtered, washed three times with deionized water and absolute ethanol, placed in a vacuum oven at 300°C, and dried for 1 hour to obtain Cu 2 V 2 o 7 -CuO nanocomposites.

Embodiment 3

[0027] 1) Press V 5+ and Cu 2+ With a molar ratio of 1:1, analytically pure V 2 o 5 Powder dispersed in 1mol / L CuCl 2 in aqueous solution;

[0028] 2) Under magnetic stirring, use ammonia water to adjust the pH of the solution to 9, and continue stirring to form a reaction precursor;

[0029] 3) Pour the reaction precursor into a microwave hydrothermal reaction kettle. After the equipment is ready, place it in a microwave hydrothermal instrument with a power of 400W, and conduct a microwave hydrothermal reaction at 200°C for 1 hour. After the reaction is completed and the instrument is automatically cooled, vacuum pump Filter, wash with deionized water and absolute ethanol three times each, place in a vacuum oven at 300°C, and dry for 0.5h to obtain Cu 2 V 2 o 7 -CuO nanocomposites.

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Abstract

The invention discloses a method for preparing a Cu2V2O7-CuO nano compound by using a microwave hydrothermal method. The method comprises the following steps: dispersing analytically pure V2O5 powderinto a CuCl2 solution; under magnetic stirring, adjusting the pH value of the solution to 7-9, and continuously stirring so as to form a reaction precursor; pouring the reaction precursor into a microwave hydrothermal reaction kettle, putting into a microwave hydrothermal instrument, performing a microwave hydrothermal reaction at 100-200 DEG C, after the reaction is completed and the instrument is automatically cooled, separating the product, washing, and drying, thereby obtaining the Cu2V2O7-CuO nano compound. The Cu2V2O7-CuO nano compound is prepared by using the microwave hydrothermal method, by virtue of the advantages of uniform microwave heating, no thermal conduction process and rapid heating speeds, the Cu2V2O7-CuO nano compound is prepared within a very short time, and the product is high in purity, good in crystallinity and uniform in morphology size, and the method is easy in raw material obtaining, short in preparation cycle, low in energy consumption, simple in process, high in repeatability and good in feasibility.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for batteries, and in particular relates to the preparation of Cu by a microwave hydrothermal method for electrode materials of lithium-ion batteries. 2 V 2 o 7 - Method for CuO nanocomposites. Background technique [0002] Copper vanadate (Cu x V y o z ) is a layered structure that can undergo multi-step reduction during intercalation / deintercalation of lithium ions (Cu 2+ / Cu + and Cu + / Cu 0 ), considered to be a lithium-ion battery electrode material with potential application value. Cu 2 V 2 o 7 It is monoclinic phase, C2 / c space group, and has potential application value in negative thermal expansion, magnetism, catalytic oxidation, etc. [0003] As a semiconductor material, Cu 2 V 2 o 7 The synthesis generally adopts the solid-state sintering method, which has a long reaction time, high energy consumption, and the size of the synthesized product is large, which w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/0525C01G31/00B82Y30/00
CPCB82Y30/00C01G31/00C01P2002/72C01P2004/03C01P2004/32C01P2004/45C01P2004/62C01P2004/80H01M4/366H01M4/38H01M4/48H01M10/0525Y02E60/10
Inventor 曹丽云王勇黄剑锋寇领江李嘉胤冯亮亮赵亚娟许占位
Owner SHAANXI UNIV OF SCI & TECH
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