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Method for preparing high-specific-capacity composite electrode material MnO2/Mn3O4

A composite electrode, high specific capacity technology, used in nanotechnology for materials and surface science, battery electrodes, circuits, etc., can solve problems such as high cost and complex preparation methods, achieve high charge-discharge specific capacity, and simple operation. , the effect of good cycle stability

Active Publication Date: 2020-11-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Current research mostly uses carbon materials as composite materials, and improves its electrochemical performance by combining carbon materials (such as graphene, carbon nanotubes, etc.) with manganese oxides , but its cost is high and the preparation method is complicated

Method used

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  • Method for preparing high-specific-capacity composite electrode material MnO2/Mn3O4
  • Method for preparing high-specific-capacity composite electrode material MnO2/Mn3O4
  • Method for preparing high-specific-capacity composite electrode material MnO2/Mn3O4

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] MnO 2 / Mn 3 o 4 The preparation method of composite material, comprises the following steps:

[0030] Step 1: Weigh 0.034g MnSO 4 ·H 2 O with 0.19 g KMnO 4 , Measure 40mL of deionized water and prepare a mixed solution.

[0031] Step 2: Add 0.01 g of CH to the mixed solution 4 N 2 O, placed on a magnetic stirrer and stirred for 5min to make it evenly mixed.

[0032] Step 3: Pour the solution in step 2 into an autoclave with a solution volume of 40 ml, and heat at 160° C. for 16 h.

[0033] Step 4: Pour off the supernatant of the product obtained from the reaction, then put the resulting precipitate into a centrifuge tube, wash it with deionized water first, then wash it with absolute ethanol, repeat 3 times in turn, and then put it in a drying box at 70 Dry at ℃ for 7h to get MnO 2 / Mn 3 o 4 composite material.

Embodiment 2

[0035] MnO 2 / Mn 3 o 4 The preparation method of composite material, comprises the following steps:

[0036] Step 1: Weigh 0.05g MnSO 4 ·H 2 O with 0.15 g KMnO 4 , Measure 30mL of deionized water to prepare a mixed solution.

[0037] Step 2: Add 0.013 g of CH to the mixed solution 4 N 2 O, placed on a magnetic stirrer and stirred for 5min to make it evenly mixed.

[0038] Step 3: Pour the solution in step 2 into an autoclave with a volume of 30 ml, and heat at 180° C. for 12 hours.

[0039] Step 4: Pour off the supernatant of the product obtained from the reaction, then put the resulting precipitate into a centrifuge tube, wash it with deionized water first, then wash it with absolute ethanol, repeat 3 times in turn, and then put it in a drying box at 70 Dry at ℃ for 5h to get MnO 2 / Mn 3 o 4 composite material.

Embodiment 3

[0041] MnO 2 / Mn 3 o 4 The preparation method of composite material, comprises the following steps:

[0042] Step 1: Weigh 0.035g MnSO 4 ·H 2 O with 0.25 g KMnO 4 , Measure 37.5mL of deionized water to prepare a mixed solution.

[0043] Step 2: Add 0.017 g of CH to the mixed solution 4 N 2 O, placed on a magnetic stirrer and stirred for 5min to make it evenly mixed.

[0044] Step 3: Pour the solution in step 2 into an autoclave with a solution volume of 30 ml, and heat at 150° C. for 18 hours.

[0045] Step 4: Pour off the supernatant of the product obtained from the reaction, then put the obtained precipitate into a centrifuge tube, wash it with deionized water first, then wash it with absolute ethanol, repeat 3 times in sequence, and then put it in an oven to dry for 6 hours. get MnO 2 / Mn 3 o 4 composite material.

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Abstract

The invention discloses a method for preparing a high-specific-capacity composite electrode material MnO2 / Mn3O4. The preparation method comprises the following steps: step 1, respectively weighing MnSO4. H2O and KMnO4, and dissolving the MnSO4. H2O and KMnO4 in deionized water; 2, weighing CH4N2O, pouring CH4N2O into the solution obtained in the step 1, and stirring the mixed solution on a magnetic stirrer; 3, pouring the solution obtained in the step 2 into a high-pressure reaction kettle, and carrying out heating; and 4, pouring out the supernatant of the product obtained by the reaction, putting the obtained precipitate into a centrifuge tube, carrying out cleaning with deionized water and cleaning with absolute ethyl alcohol, and carrying out drying in a drying oven to obtain the MnO2 / Mn3O4 composite material. MnO2 is used as a substrate, Mn3O4 grows on MnO2 nanosheets through a simple one-step hydrothermal method, and therefore, the MnO2 / Mn3O4 composite material is prepared to beused as a lithium ion battery negative electrode material. Through the electrochemical performance test, the material has good cycling stability as the lithium battery negative electrode material, andhas good electrochemical performance such as relatively high charge-discharge specific capacity under high current density.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a preparation of high specific capacity composite electrode material MnO 2 / Mn 3 o 4 Methods. Background technique [0002] Lithium-ion batteries have become the basic power supply for portable electronic devices and new energy vehicles due to their environmental friendliness, long service life, light weight and convenient manufacturing. In recent years, with the iterative update of electronic products, people have put forward higher requirements for the energy density, charge and discharge speed and safety performance of lithium-ion batteries. Anode materials are one of the main components of lithium-ion batteries and have an important impact on battery performance. At present, the commercial anode material is graphite, but its theoretical specific capacity is low (372mAh g -1 ), and there are deficiencies such as slow lithium ion deintercalation rate, low energ...

Claims

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Application Information

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IPC IPC(8): C01G45/02B82Y40/00B82Y30/00H01M4/36H01M4/505H01M10/0525
CPCC01G45/02H01M4/362H01M4/505H01M10/0525B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/61C01P2006/40C01P2004/32Y02E60/10
Inventor 夏傲赵晨鹏谈国强
Owner SHAANXI UNIV OF SCI & TECH
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