A solvothermal method for preparation of flower-like Cu 2 v 2 o 7 -cuo nanocomposite approach

A nanocomposite and solvothermal method, which is applied in the field of preparation of flower-like Cu2V2O7-CuO nanocomposites by solvothermal method, can solve the problems of affecting battery cycle stability, generating large stress, and large product size, etc. Short, good crystallinity, high reproducibility effect

Active Publication Date: 2020-07-28
SHAANXI UNIV OF SCI & TECH
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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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  • A solvothermal method for preparation of flower-like Cu <sub>2</sub> v <sub>2</sub> o <sub>7</sub> -cuo nanocomposite approach
  • A solvothermal method for preparation of flower-like Cu <sub>2</sub> v <sub>2</sub> o <sub>7</sub> -cuo nanocomposite approach

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) will analytically pure V 2 o 5 The powder is dissolved in an aqueous hydrogen peroxide solution with a mass fraction of 15% to obtain V 5+ The concentration is 0.5mol / l brownish red transparent solution A;

[0021] 2) Under magnetic stirring, press V 5+ and Cu 2+ The molar ratio is 1:0.5 Add solution A to the concentration of 0.1mol / L Cu(CH 3 COO) 2 in ethanol solution;

[0022] 3) Use analytically pure sodium hydroxide to adjust the pH value of the solution to 7, and continue to stir to form a reaction precursor;

[0023] 4) Pour the reaction precursor into the reaction kettle, put it in a homogeneous hydrothermal instrument after the equipment is ready, and carry out the hydrothermal reaction at 100°C for 48 hours. Centrifuge and wash with water and ethanol three times respectively, and dry in an electric blast drying oven at 250°C for 2 hours to obtain flower-shaped Cu 2 V 2 o 7 -CuO nanocomposites.

Embodiment 2

[0025] 1) will analytically pure V 2 o 5 The powder is dissolved in an aqueous hydrogen peroxide solution with a mass fraction of 15% to obtain V 5+ The concentration is 0.3mol / l brownish red transparent solution A;

[0026] 2) Under magnetic stirring, press V 5+ and Cu 2+ The molar ratio is 1:1. Solution A is added to the concentration of 0.5mol / L Cu(CH 3 COO) 2 in ethanol solution;

[0027] 3) Use analytically pure sodium hydroxide to adjust the pH value of the solution to 8, and continue to stir to form a reaction precursor;

[0028] 4) Pour the reaction precursor into the reaction kettle, put it in the homogeneous hydrothermal instrument after the equipment is ready, and carry out the hydrothermal reaction at 150°C for 24 hours. Water and ethanol were washed by centrifugation for 3 times respectively, and dried in an electric blast drying oven at 300°C for 3 hours to obtain flower-shaped Cu 2 V 2 o 7 -CuO nanocomposites.

Embodiment 3

[0030] 1) will analytically pure V 2 o 5 The powder is dissolved in an aqueous hydrogen peroxide solution with a mass fraction of 15% to obtain V 5+ The concentration is 0.8mol / l brownish red transparent solution A;

[0031] 2) Under magnetic stirring, press V 5+ and Cu 2+ The molar ratio is 1:2. Solution A is added to the concentration of 1mol / L Cu(CH 3 COO) 2 in ethanol solution;

[0032] 3) Use analytically pure sodium hydroxide to adjust the pH value of the solution to 9, and continue to stir to form a reaction precursor;

[0033] 4) Pour the reaction precursor into the reaction kettle, put it in the homogeneous hydrothermal instrument after the equipment is ready, and carry out the hydrothermal reaction at 200°C for 8 hours. Centrifuge and wash with water and ethanol three times respectively, and dry in an electric blast drying oven at 300°C for 4 hours to obtain flower-shaped Cu 2 V 2 o 7 -CuO nanocomposites.

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Abstract

The invention discloses a method for preparing a flower-like Cu2V2O7-CuO nanocomposite according to a solvothermal method. The method comprises the following steps: dissolving analytically pure V2O5 powder into an aqueous hydrogen peroxide solution to obtain a solution A; adding the solution A into an ethanol solution of Cu(CH3COO)2 under a magnetic stirring condition; adjusting the pH value of the solution to 7-9, and continuing stirring to form a reaction precursor; pouring the reaction precursor into a reaction kettle, placing in a homogeneous hydrothermal instrument after mounting, performing a hydrothermal reaction at 100-200 DEG C. After the reaction is completed, the apparatus is cooled automatically, and separating, washing and drying a product after completion of the reaction andautomatic cooling of the instrument so as to obtain the flower-like Cu2V2O7-CuO nanocomposite. The solvothermal method is used for preparing the flower-like Cu2V2O7-CuO nanocomposite, and compared with a solid-phase reaction method, the solvothermal method has the advantages as follows: the solvothermal method is cheaper, more convenient and more effective, and the preparation time of theCu2V2O7-CuO nanocomposite is relatively short. The prepared product has high purity, good crystallinity, uniform morphology and size and complete flower-like morphology; the raw materials are easy to obtain, the preparation cycle is short, the energy consumption is low, the process is simple, the repeatability is high, and the feasibility is strong; the prepared flower-like Cu2V2O7-CuO nanocomposite has avery good lithium storage property.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for batteries, and in particular relates to a lithium-ion battery electrode material prepared by a solvothermal method to prepare flower-shaped Cu 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 will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/0525C01G3/02C01G31/00B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01G3/02C01G31/00C01P2002/72C01P2004/03C01P2004/16C01P2004/50H01M4/36H01M4/38H01M4/48H01M10/0525Y02E60/10
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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