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Preparation method of manganous-manganic oxide/graphene composite material

A technology of trimanganese tetraoxide and composite materials, which is applied in the field of preparation of trimanganese tetraoxide/graphene composite materials, and can solve the constraints on the commercial application of trimanganese tetraoxide, low conductivity and poor rate performance of trimanganese tetraoxide, etc. problem, to achieve the effect of high-current discharge performance, low price, and high capacity

Inactive Publication Date: 2014-09-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, trimanganese tetroxide mainly faces two problems: on the one hand, the conductivity of trimanganese tetraoxide is low, resulting in poor rate performance; There will be drastic volume changes, which will cause severe agglomeration and pulverization of the material, resulting in rapid loss of its capacity
These problems have seriously restricted the commercial application of manganese tetraoxide as an anode material for lithium-ion batteries.

Method used

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  • Preparation method of manganous-manganic oxide/graphene composite material
  • Preparation method of manganous-manganic oxide/graphene composite material
  • Preparation method of manganous-manganic oxide/graphene composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Add 0.16g graphite oxide, 3g manganese sulfate, 150mL deionized water to a 250mL beaker, stir uniformly for 4 hours, then add 3g potassium permanganate, and stir uniformly for 4 hours. Slowly add 32 mL of 30 wt% hydrogen peroxide into the beaker dropwise, and sonicate for 3 hours. The product was placed in an oil bath at 100°C, 8 mL of hydrazine hydrate was added dropwise, and the mixture was stirred for 24 hours. After the product was washed with water and suction filtered, it was dried at 60° C. for 12 hours to obtain the manganese tetroxide / graphene composite material.

[0036] figure 1 It is the XRD diffractogram of the material, according to the standard card, it can be seen that the obtained product is manganese tetroxide, and there is no impurity phase. image 3 For the SEM photo of the material, it can be seen that the graphite oxide has been exfoliated into a graphene sheet-like structure, and a large number of manganese tetroxide particles are distributed on...

Embodiment 2

[0040] Add 0.25g graphite oxide, 3g manganese sulfate, 150mL deionized water to a 250mL beaker, stir uniformly for 4 hours, then add 3g potassium permanganate, and stir uniformly for 4 hours. Slowly add 45 mL of 30 wt% hydrogen peroxide into the beaker dropwise, and sonicate for 3 hours. The product was placed in an oil bath at 100°C, 10 mL of hydrazine hydrate was added dropwise, and the mixture was stirred for 24 hours. After the product was washed with water and suction filtered, it was dried at 60° C. for 12 hours to obtain the manganese tetroxide / graphene composite material.

[0041] The XRD pattern of the composite product is similar figure 1 , similar in appearance image 3 . Use the prepared manganese tetroxide / graphene composite material to make electrodes according to the method of Example 1, assemble into a simulated lithium ion battery, and the first charge-discharge capacity reaches 1500mAhg -1 , 800mAg -1 The discharge capacity is close to 300mAhg -1 .

Embodiment 3

[0043] Add 0.2g graphite oxide, 5g manganese sulfate, and 150mL deionized water to a 250mL beaker, stir uniformly for 4 hours, then add 5g potassium permanganate, and stir uniformly for 4 hours. Slowly add 44 mL of 30 wt% hydrogen peroxide into the beaker dropwise, and sonicate for 3 hours. The product was put into an oil bath at 100°C, 6 mL of hydrazine hydrate was added dropwise, and the mixture was stirred for 24 hours. After the product was washed with water and suction filtered, it was dried at 60° C. for 12 hours to obtain the manganese tetroxide / graphene composite material.

[0044] The XRD pattern of the composite product is similar figure 1 , similar in appearance image 3 . Use the prepared manganese tetroxide / graphene composite material to make electrodes according to the method of Example 1, assemble into a simulated lithium ion battery, and the first charge-discharge capacity reaches 1600mAhg -1 , 800mAg -1 The discharge capacity is close to 300mAhg -1 .

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Abstract

The invention discloses a preparation method of a manganous-manganic oxide / graphene composite material. The preparation method comprises the following steps: mixing oxidized graphene, manganese sulfate and water together at room temperature, and stirring for 1-10 hours; adding potassium permanganate and continuing stirring for 1-10 hours; dropwise adding 30wt% of hydrogen peroxide, applying ultrasound for 1-10 hours; finally, dropwise adding hydrazine hydrate, and increasing the temperature to the range of 50-150 DEG C for reacting for 10-30 hours; carrying out suction filtration after the reaction is finished, washing the material filtered out with water and drying to obtain the manganous-manganic oxide / graphene composite material; the obtained manganous-manganic oxide / graphene composite material has the characteristics such as high capacity, good electrical conductivity, high cycling stability and good large current discharge performance, and thus being widely applied to the fields of high-performance lithium-ion batteries and the like as a lithium-ion battery anode material.

Description

(1) Technical field [0001] The invention relates to a method for preparing a manganese tetroxide / graphene composite material, in particular to a method for preparing a manganese tetroxide / graphene composite material by a micro-explosion method. (2) Background technology [0002] As a manganese-based oxide material, manganese tetroxide has a high theoretical specific capacity (936mAh / g), and is considered to be one of the most promising anode materials for high-capacity lithium-ion batteries. In addition, manganese tetroxide also has the advantages of abundant raw material sources, low price, environmental friendliness, and good battery safety. However, in practical applications of manganese tetroxide, it mainly faces two problems: on the one hand, the low conductivity of manganese tetroxide leads to poor rate performance; on the other hand, in the process of repeated insertion and removal of lithium ions, A drastic volume change occurs, causing severe agglomeration and pulv...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/1393
CPCY02E60/122H01M4/366H01M4/502H01M4/625H01M10/0525Y02E60/10
Inventor 黄辉章理远张文魁方明育陶新永甘永平夏阳
Owner ZHEJIANG UNIV OF TECH
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