Carbon-coated potassium iron manganate inner connecting nanowire material and preparation method and application thereof

A technology of nanowires and interconnections, applied in the fields of nanomaterials and electrochemistry, to achieve the effects of high reversible specific capacity, uniform morphology and high rate performance

Inactive Publication Date: 2017-05-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, carbon-coated K 0.7 Fe 0.5 mn 0.5 o 2 Interconnected nanowire materials have not been reported yet

Method used

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  • Carbon-coated potassium iron manganate inner connecting nanowire material and preparation method and application thereof
  • Carbon-coated potassium iron manganate inner connecting nanowire material and preparation method and application thereof
  • Carbon-coated potassium iron manganate inner connecting nanowire material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Carbon coated K 0.7 Fe 0.5 mn 0.5 o 2 A method for preparing an interconnected nanowire material, comprising the steps of:

[0037] 1) 3.5mmol CH 3 COOK, 2.5mmol Fe(NO 3 ) 3 9H 2 O and 2.5mmol Mn(CH 3 COO) 2 Add it to 40.0mL deionized water, and stir it magnetically at 25°C to dissolve it completely, forming a uniform and transparent solution;

[0038] 2) Weigh 4.0 g of polyvinylpyrrolidone (K=30) and add it to the solution obtained in step 1), and stir magnetically for 8 hours to dissolve it completely;

[0039] 3) leave the solution obtained in step 2) for 4 hours to obtain a uniform, transparent, stable precursor solution with a certain viscosity;

[0040] 4) the solution obtained in step 3) was mixed with 0.4ml h -1 The speed is transferred to the syringe, electrospinning is carried out under the condition of positive high voltage 21.0kV, and the nanofiber is received by aluminum foil;

[0041] 5) Put the product obtained in step 4) in a muffle furnace, ...

Embodiment 2

[0050] 1) Add 2.0mmol CH 3 COOK, 1.5mmol K 2 CO 3 , 2.5mm Fe(NO 3 ) 3 9H 2 O and 2.5mmol Mn(CH 3 COO) 2 Add it to 50.0mL deionized water, and stir it magnetically at 25°C to dissolve it completely, forming a uniform and transparent solution;

[0051] 2) Weigh 4.0 g of polyvinylpyrrolidone (K=30) and add it to the solution obtained in step 1), and stir magnetically for 8 hours to dissolve it completely;

[0052] 3) leave the solution obtained in step 2) for 6 hours to obtain a uniform, transparent, stable precursor solution with a certain viscosity;

[0053] 4) the solution obtained in step 3) was mixed with 0.3ml h -1 The speed is transferred to the syringe, electrospinning is carried out under the condition of positive high voltage 21.0kV, and the nanofiber is received by aluminum foil;

[0054] 5) Put the product obtained in step 4) in a muffle furnace, slowly raise the temperature to 320°C at a rate of 2°C / min in an air atmosphere, and keep it warm for 2h;

[0055...

Embodiment 3

[0058] 1) Add 3.5mmol K 2 CO 3 , 2.5mm Fe(NO 3 ) 3 9H 2 O and 2.5mmol Mn(CH 3 COO) 2 Add it to 50.0mL deionized water, and stir it magnetically at 25°C to dissolve it completely, forming a uniform and transparent solution;

[0059] 2) Weigh 4.0 g of polyvinylpyrrolidone (K=30) and add it to the solution obtained in step 1), and stir magnetically for 8 hours to dissolve it completely;

[0060] 3) leave the solution obtained in step 2) for 4 hours to obtain a uniform, transparent, stable precursor solution with a certain viscosity;

[0061] 4) the solution obtained in step 3) was mixed with 0.4ml h -1 The speed is transferred to the syringe, electrospinning is carried out under the condition of positive high voltage 20.5kV, and the nanofiber is received by aluminum foil;

[0062] 5) Put the product obtained in step 4) in a muffle furnace, slowly raise the temperature to 280°C at a rate of 1°C / min in an air atmosphere, and keep it warm for 2h;

[0063] 6) The product obt...

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Abstract

The invention provides a carbon-coated K<0.7>Fe<0.5>Mn<0.5>O<2> inner connecting nanowire material and a preparation method thereof. K<0.7>Fe<0.5>Mn<0.5>O<2> nanocrystals are coated with a graphitized carbon layer to form nanowires with diameter of 50-150nm; and the nanowires are connected in a staggered manner to form a one-dimensional net-shaped structure, wherein the content of the surface carbon layer is 4.0 to 8.0wt.%. The inner connecting nanowire material, which can be used as a positive electrode material of a potassium ion battery, has high structural stability, and improves cycling stability and rate capability of a positive electrode active material of the potassium ion battery; and the inner connecting nanowire material has the characteristics of low cost of raw materials, simple and environment-friendly process, high product yield, and excellent material electrochemical property.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to carbon-coated K 0.7 Fe 0.5 mn 0.5 o 2 The inner connection nanowire material and the preparation method thereof, the material can be used as the positive electrode active material of the potassium ion battery. Background technique [0002] In recent years, with the development of new energy sources and the promotion of smart grid systems, the energy storage system has higher and higher requirements for the construction of new energy infrastructure. Among the current energy storage technologies, rechargeable batteries are favored by people due to their long service life and good economic benefits, such as traditional lead-acid batteries, nickel-cadmium batteries, and lithium-ion batteries. However, each conventional battery has shortcomings and limitations, making it difficult to meet the growing demand for energy storage. Therefore, the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/587H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/587H01M10/054Y02E60/10
Inventor 麦立强汪晨阳韩康王选朋
Owner WUHAN UNIV OF TECH
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