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Method for improving sodium storage performance of vanadium pentoxide electrode material through copper ion pre-embedding

An electrode material and performance technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of layered structure instability, easy distortion, collapse and pulverization, poor material cycle stability, etc., and achieve high Na+ intercalation/ The effect of desorption performance, easy control of reaction conditions, and improvement of sodium storage performance

Inactive Publication Date: 2019-04-16
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, V 2 o 5 ·nH 2 The layered structure of O is unstable, and it is easy to distort, collapse and pulverize during repeated charge and discharge, resulting in poor cycle stability of the material; Na + at V 2 o 5 ·nH 2 O interlayer diffusion is slow, resulting in poor rate performance of the material; V 2 o 5 ·nH 2 The inherent poor electronic conductivity of O materials seriously affects their charge-discharge performance at high current densities.
These problems restrict the V 2 o 5 ·nH 2 Practical applications of O in sodium-ion batteries

Method used

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  • Method for improving sodium storage performance of vanadium pentoxide electrode material through copper ion pre-embedding
  • Method for improving sodium storage performance of vanadium pentoxide electrode material through copper ion pre-embedding
  • Method for improving sodium storage performance of vanadium pentoxide electrode material through copper ion pre-embedding

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) First, 0.2547g of commercial vanadium pentoxide (V 2 o 5 ) powder and 3.85mL deionized water were mixed and stirred, and 1.15mL of 30% H by mass percentage was slowly added dropwise while stirring. 2 o 2 , continue to stir for 15 minutes after the addition is complete, then add deionized water to it to dilute the solution to the concentration of vanadium pentoxide Finally, the solution was transferred to an ultrasonic cleaner to continue ultrasonic treatment for 90 minutes, and left to age at room temperature for 3 days to obtain a reddish-brown V 2 o 5 gel.

[0020] (2) Stir and disperse the gel obtained in step (1), and dilute it with 25 mL of deionized water, and stir thoroughly for 6 hours to obtain a uniform and transparent V 2 o 5 sol

[0021] (3) The sol obtained in step (2) was frozen in the refrigerator for 24 hours and then transferred to a freeze dryer to dry to constant weight and then taken out to obtain V 2 o 5 ·nH 2 O electrode material p...

Embodiment 2

[0024] (1) First, 0.2547g of commercial vanadium pentoxide (V 2 o 5 ) powder and 3.85mL deionized water were mixed and stirred, and 1.15mL of 30% H by mass percentage was slowly added dropwise while stirring. 2 O, continue to stir for 15 minutes after the dropwise addition is completed, then add deionized water wherein the solution is diluted to the concentration of vanadium pentoxide Finally, the solution was transferred to an ultrasonic cleaner to continue ultrasonic treatment for 90 minutes, and left to age at room temperature for 3 days to obtain a reddish-brown V 2 o 5 gel.

[0025] (2) Stir and disperse the gel obtained in step (1), and mix 25 mL of Cu(NO 3 ) 2 The solution was slowly added dropwise to the gel, and after stirring for 6 hours, a uniform and transparent V 2 o 5 sol

[0026] (3) The sol obtained in step (2) was frozen in the refrigerator for 24 hours and then transferred to a freeze dryer to dry to a constant weight and then taken out to obtain Cu ...

Embodiment 3

[0029] (1) First, 0.2547g of commercial vanadium pentoxide (V 2 o 5 ) powder and 3.85mL deionized water were mixed and stirred, and 1.15mL of 30% H by mass percentage was slowly added dropwise while stirring. 2 O, continue to stir for 15 minutes after the dropwise addition is completed, then add deionized water wherein the solution is diluted to the concentration of vanadium pentoxide Finally, the solution was transferred to an ultrasonic cleaner to continue ultrasonic treatment for 90 minutes, and left to age at room temperature for 3 days to obtain a reddish-brown V 2 o 5 gel.

[0030] (2) Stir and disperse the gel obtained in step (1), and mix 25 mL of Cu(NO 3 ) 2 The solution was slowly added dropwise to the gel, and after stirring for 6 hours, a uniform and transparent V 2 o 5 sol

[0031] (3) The sol obtained in step (2) was frozen in the refrigerator for 24 hours and then transferred to a freeze dryer to dry to a constant weight and then taken out to obtain C...

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Abstract

The invention discloses a method for improving sodium storage performance of vanadium pentoxide electrode material through copper ion pre-embedding. The method comprises the following steps of firstly, taking commercial vanadium pentoxide (V2O5) powder as a vanadium source, taking copper nitrate trihydrate as a copper source, taking hydrogen peroxide as a cosolvent, and preparing Cu2+ pre-embeddedV2O5.nH2O precursor through a sol-gel method by combination of a vacuum freeze-drying technology; and next, carrying out annealing treatment in the air to obtain a Cu2+ pre-embedded V2O5.nH2O electrode material. Through Cu2+ pre-embedded V2O5.nH2O, the sodium storage performance of the V2O5.nH2O electrode material can be obviously improved. When the prepared Cu2+ pre-embedded V2O5.nH2O electrodematerial is used as the positive electrode material of a sodium ion battery, relatively high rate capability and cycling stability are shown; and meanwhile, the method also has the advantages of beingsimple in preparation method, low in cost, high in yield, easy to control reaction conditions and the like.

Description

technical field [0001] The invention relates to the technical field of anode materials for sodium ion batteries, in particular to a 2+ Pre-embedded to improve vanadium pentoxide (V 2 o 5 ·nH 2 O) A method for the sodium storage properties of electrode materials. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, electric vehicles and other fields due to their high energy density, long cycle life and environmental friendliness. Due to the limited resources of metal lithium, with the increasing demand for lithium metal, the cost of lithium-ion battery preparation has been greatly increased. The reserve of metallic sodium is much higher than that of metallic lithium, and it has similar physical and chemical properties to metallic lithium. Therefore, sodium-ion batteries are considered to be the most potential substitutes for lithium-ion batteries. However, Na + Radius ratio Li + The radius is large, resulting in Na + Diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/054
CPCH01M4/366H01M4/483H01M4/626H01M4/628H01M10/054Y02E60/10
Inventor 李延伟孙涛姚金环季靖程
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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