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Potassium ion embedded type vanadium pentoxide nanowire and preparation method thereof and application thereof

A vanadium pentoxide nanometer and vanadium pentoxide technology, which is applied in the field of potassium ion pre-embedded vanadium pentoxide nanowires and its preparation, can solve the problems of limiting practical applications, capacity fading, cycle performance degradation, etc. The effects of market promotion, high specific capacity, and super good rate performance

Active Publication Date: 2013-07-17
安徽国芯新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, during the charge and discharge process of vanadium pentoxide, with Li + The increase in the amount of ion intercalation, V 2 o 5 The wrinkled layer structure, the disordered crystal structure and the occurrence of irreversible phase transition will cause the degradation of its cycle performance and the rapid decay of capacity, which greatly limits its practical application in lithium-ion batteries.
In recent years, most of the modification work on vanadium pentoxide is to improve its performance by compounding with other high-conductivity materials and constructing special structures such as porous structures. The work of pre-embedding potassium ions between layers has not been reported yet.

Method used

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  • Potassium ion embedded type vanadium pentoxide nanowire and preparation method thereof and application thereof
  • Potassium ion embedded type vanadium pentoxide nanowire and preparation method thereof and application thereof
  • Potassium ion embedded type vanadium pentoxide nanowire and preparation method thereof and application thereof

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Embodiment 1

[0035] The preparation method of potassium ion pre-embedded type vanadium pentoxide nanowire, it comprises the steps:

[0036] 1) Weigh 0.7g SDS (sodium dodecyl sulfate) into 30ml deionized water, stir with a magnetic stirrer for 20 minutes, add 0.1818g V after the SDS is dissolved 2 o 5 Stir for another 20 minutes, then add 2ml of 1mol / L aqueous KOH solution therein, and continue stirring for 2 hours to obtain an orange-yellow aqueous solution;

[0037] 2) Transfer the aqueous solution obtained in step 1) to a 50ml reaction kettle, heat it in water at 180°C for 48 hours, and get a dark green product after taking it out;

[0038] 3) The product obtained in step 2) was centrifuged, washed 5 times with a mixed solution of absolute ethanol and deionized water (volume ratio 1:1), and dried in an oven at 80°C for 12 to 24 hours;

[0039] 4) The dried product obtained in step 3) was heat-treated in a muffle furnace at 600°C for 4 hours at a heating rate of 3°C / min, and a yellow-gr...

Embodiment 2

[0046] The preparation method of potassium ion pre-embedded type vanadium pentoxide nanowire, it comprises the steps:

[0047] 1) Weigh 0.7g SDS (sodium dodecyl sulfate) into 30ml deionized water, stir with a magnetic stirrer for 20 minutes, add 0.1818g V after the SDS is dissolved 2 o 5 Stir for another 20 minutes, then add 2ml of 1mol / L aqueous KOH solution therein, and continue stirring for 2 hours to obtain an orange-yellow aqueous solution;

[0048] 2) Transfer the aqueous solution obtained in step 1) to a 50ml reaction kettle, heat it in water at 180°C for 72 hours, and get a dark green product after taking it out;

[0049] 3) The product obtained in step 2) was centrifuged, washed 5 times with a mixed solution of absolute ethanol and deionized water (volume ratio 1:1), and dried in an oven at 80°C for 12 to 24 hours;

[0050] 4) The dried product obtained in step 3) was heat-treated in a muffle furnace at 500°C for 5 hours at a heating rate of 3°C / min, and a yellow-gr...

Embodiment 3

[0054] The preparation method of potassium ion pre-embedded type vanadium pentoxide nanowire, it comprises the steps:

[0055] 1) Weigh 0.1818g V 2 o 5 Add it to 30ml of deionized water, stir with a magnetic stirrer for 20 minutes, then add 0.5ml of 1mol / L KOH aqueous solution to it, and continue stirring for 24 hours to obtain an orange-yellow aqueous solution;

[0056] 2) Transfer the aqueous solution obtained in step 1) to a 50ml reaction kettle, heat it in water at 180°C for 120 hours, and get a dark green product after taking it out;

[0057] 3) The product obtained in step 2) was centrifuged, washed 5 times with a mixed solution of absolute ethanol and deionized water (volume ratio 1:1), and dried in an oven at 80°C for 12 to 24 hours;

[0058] 4) The dried product obtained in step 3) was heat-treated in a muffle furnace at 400°C for 8 hours at a heating rate of 3°C / min, and a yellow-green sample was obtained after heat treatment;

[0059] 5) Wash the sample obtained ...

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Abstract

The invention relates to a potassium ion embedded type vanadium pentoxide nanowire and a preparation method thereof. The preparation method includes 1), weighing V205 to add into deionized water, adding a KOH (potassium hydroxide) water solution and stirring to obtain a water solution; 2), transferring the water solution into a reaction still, heating the water solution, and obtaining deep green products after the water solution is taken out; 3), performing centrifugal separation, washing the deep green products by a mixed solution mixing with absolute ethyl alcohol and deionized water, and then placing the deep green products in a dryer to dry; 4), putting the deep green products in a muffle furnace to have a heat treatment to obtain yellow green samples; and 5), washing the yellow green samples in step 4 with the mixed solution mixing with the absolute ethyl alcohol and the deionized water, putting the yellow green samples in the dryer to dry to obtain the potassium ion embedded type vanadium pentoxide nanowire. The potassium ion embedded type vanadium pentoxide nanowire has the advantages that the nanowire has high specific capacity, good cycling stability and excellent rate capability, and is a potential high-performance commercial lithium ion battery anode material.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and electrochemistry, and in particular relates to a potassium ion pre-embedded vanadium pentoxide nanowire and a preparation method thereof. The nanowire can be used as a positive active material of a lithium ion battery. Background technique [0002] With the ever-increasing demand for energy, exploring new clean energy materials with excellent performance has become a challenge today. Vanadium pentoxide, which has a typical layered structure, is suitable for intercalation and extraction of lithium ions. As a positive electrode material for lithium ion batteries, it has the advantages of high theoretical capacity, low price, and simple synthesis method, and has received more and more attention. people's attention. [0003] However, during the charge and discharge process of vanadium pentoxide, with Li + The increase in the amount of ion intercalation, V 2 o 5 The wrinkled layer s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48B82Y30/00
CPCY02E60/10
Inventor 麦立强赵云龙徐小明
Owner 安徽国芯新材料股份有限公司
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