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In situ carbon-coated hexagonal k 0.7 [fe 0.5 mn 0.5 ]o 2 Nanomaterials and their preparation methods and applications

A nanomaterial and hexagonal technology, applied in the field of nanomaterials and electrochemistry, can solve the problems of high capacity, poor conductivity, and difficult shape of nanoflowers, and improve cycle stability and rate performance , prevent self-agglomeration, uniform shape

Active Publication Date: 2017-01-18
安徽国芯新材料股份有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, layered transition metal oxides are difficult to obtain due to the pure phase, and their shape is difficult to nanoflowers and poor conductivity, so that it is difficult to fully exert their high capacity, so we need to use in-situ coating of conductive substances , while improving its electronic conductivity, inhibiting the secondary agglomeration of its grains and improving its electrochemical performance
Currently, in situ carbon-coated hexagonal K 0.7 [Fe 0.5 mn 0.5 ]O 2 Nanomaterials have not been reported

Method used

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  • In situ carbon-coated hexagonal k <sub>0.7</sub> [fe <sub>0.5</sub> mn <sub>0.5</sub> ]o <sub>2</sub> Nanomaterials and their preparation methods and applications
  • In situ carbon-coated hexagonal k <sub>0.7</sub> [fe <sub>0.5</sub> mn <sub>0.5</sub> ]o <sub>2</sub> Nanomaterials and their preparation methods and applications
  • In situ carbon-coated hexagonal k <sub>0.7</sub> [fe <sub>0.5</sub> mn <sub>0.5</sub> ]o <sub>2</sub> Nanomaterials and their preparation methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In situ carbon-coated hexagonal K 0.7 [Fe 0.5 mn 0.5 ]O 2 The preparation method of nanometer material, it comprises the steps:

[0037] 1) Add 7.0mmol KNO 3 , 5.0mmol Fe(NO 3 ) 3 .9H 2 O, 5.0mmol Mn(CH 3 COO) 2 Add 6.0g oxalic acid into 20mL deionized water, stir at 25°C until the solution is light yellow and transparent;

[0038] 2) Move the solution obtained in step 1) to an 80° C. water bath and stir for 4 hours to obtain a brown-red transparent solution;

[0039] 3) Transfer the solution obtained in step 2) into a petri dish, and dry at a constant temperature of 80°C;

[0040] 4) The solid obtained in step 3) is then quickly transferred to a high temperature of 180°C and baked for 12 hours to obtain a loose solid structure;

[0041] 5) Grinding the product obtained in step 4), and then calcining at 300°C for 3 hours in air;

[0042] 6) Move step 5) to 600, 800, and 1000°C for calcination under argon for 8 hours to obtain in-situ carbon-coated hexagonal ...

Embodiment 2

[0052] 1) Add 3.5mmol K 2 CO 3 , 2.5mmol Fe 2 (SO 4 ) 3 .9H 2 O, 2.5 mmol Mn 2 CO 3 Add 2.0g of citric acid into 20mL of deionized water, stir at 25°C until the solution is light yellow and transparent;

[0053] 2) Move the solution obtained in step 1) to a 60° C. water bath and stir for 6 hours to obtain a brown-red transparent solution;

[0054] 3) Transfer the solution obtained in step 2) into a petri dish, and dry it at a constant temperature of 60°C;

[0055] 4) The solid obtained in step 3) is then quickly transferred to a high temperature of 120°C and baked for 10 hours to obtain a loose solid structure;

[0056] 5) Grinding the product obtained in step 4), and then calcining at 400°C for 3 hours in air;

[0057] 6) Move step 5) to 600°C for calcination under argon for 12 hours to obtain in-situ carbon-coated hexagonal K 0.7 [Fe 0.5 mn 0.5 ]O 2 nanomaterials.

[0058] With the in-situ carbon coating hexagonal K obtained in this example 0.7 [Fe 0.5 mn 0....

Embodiment 3

[0060] 1) Add 3.5mmol KNO 3 , 1.75 mmol K 2 SO 4 , 2.5mmol Fe(NO 3 ) 3 .9H 2 O, 1.25mmolFe 2 (SO 4 ) 3 .7H 2 O, 2.5mmol Mn(CH 3 COO) 2 , 1.25mmol Mn 2 CO 3 , 2.0g oxalic acid and 2.0g citric acid were added to 40mL deionized water, and stirred at 25°C until the solution was light yellow and transparent;

[0061] 2) Move the solution obtained in step 1) to a water bath at 50° C. and stir for 6 hours to obtain a brown-red transparent solution;

[0062] 3) Transfer the solution obtained in step 2) into a petri dish, and dry it at a constant temperature of 90°C;

[0063] 4) The solid obtained in step 3) is then quickly transferred to a high temperature of 200°C and baked for 10 hours to obtain a loose solid structure;

[0064] 5) Grinding the product obtained in step 4). Then calcined at 500°C for 2 hours in air;

[0065] 6) Move step 5) to 1000°C for calcination under argon for 10 hours to obtain in-situ carbon-coated hexagonal K 0.7 [Fe 0.5 mn 0.5 ]O 2 nanoma...

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Abstract

The invention relates to an in-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material as well as a preparation method and an application thereof. The material can serve as a sodium-ion battery positive active material which is formed by coating K0.7[Fe0.5Mn0.5]O2 hexagonal nano crystals with graphitized carbon layers; the diameter of the hexagonal nano crystals is 100-350nm; the thickness of the graphitized carbon layers is 6-10nm. The in-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material has the beneficial effects that the nano material with relatively uniform shape is finally prepared by combining methods of drying solutions and calcinating atmosphere; the material serves as a sodium-ion battery positive material active substance and shows relatively high specific discharge capacity and excellent cycling stability; on the other hand, the process is simple; the in-situ carbon-coating hexagon K0.7[Fe0.5Mn0.5]O2 nano material is prepared by simply drying and calcinating the solution; the energy consumption is relatively low.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to in-situ carbon-coated hexagonal K 0.7 [Fe 0.5 mn 0.5 ]O 2 A nanometer material and a preparation method thereof, the material can be used as a positive electrode active material of a sodium ion battery. Background technique [0002] With the development of science and technology and the rapid growth of population, the consumption of energy in the new century is also increasing, the depletion of non-renewable resources such as oil, coal and natural gas, it is urgent to find clean energy to make up for the gap in energy demand, and at the same time require clean Continuity and sustainability of energy to meet usage requirements. In the existing mainstream energy system, oil and coal are non-renewable energy sources, and they also produce a large amount of CO in the process of use and consumption. 2 , SO 2 Harmful substances such as pollutants have b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M10/05B82Y40/00
CPCY02E60/10
Inventor 麦立强王选朋孟甲申牛朝江
Owner 安徽国芯新材料股份有限公司
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