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A kind of manganese dioxide-trimanganese tetraoxide composite material, preparation method and application thereof

A technology of trimanganese tetraoxide composite material and manganese dioxide, which is applied in nanotechnology for materials and surface science, secondary batteries, electrode manufacturing, etc., and can solve the problems of poor cycle stability and low rate performance of carbon materials , to achieve the effect of rich hydroxyl groups, slow capacity decay, and increased electronic conductivity

Active Publication Date: 2021-05-25
王建存
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although metal oxide anode materials have higher capacity than commercial carbon anode materials, they are inferior to carbon materials in cycle stability and have low rate capability

Method used

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  • A kind of manganese dioxide-trimanganese tetraoxide composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of manganese dioxide-trimanganese tetraoxide composite material, comprising the following steps:

[0024] 1) After mixing 10ml 0.05mol / L potassium permanganate solution and 10ml 0.5mol / L manganese sulfate solution, the molar ratio of potassium permanganate and manganese sulfate is 1:10, add 2ml glycerol under ultrasonic conditions, Ultrasonic disperse for 30min and mix well to obtain a mixed solution;

[0025] 2) Add 0.365gCTAB and 0.5ml of 25wt% ammonia water to the mixed system prepared in step 1), mix well, seal, and heat to 155°C for 12h reaction; after the reaction, wash, dry, and cool to room temperature, that is have to.

[0026] A manganese dioxide-trimanganese tetraoxide composite material is prepared by the above method. The composite material has a uniform size and is a nano-sized nano-rod structure. The diameter of the nano-rod is 5-80nm and the length is 50-1000nm.

Embodiment 2

[0028] The application of a manganese dioxide-trimanganese tetraoxide composite material as a lithium ion battery negative electrode material, the specific application method is as follows:

[0029] Add carbon black, the manganese dioxide-trimanganese tetraoxide composite material prepared in Example 1, and the binder into deionized water, and stir to obtain the negative electrode slurry. The mass ratio of manganese dioxide-trimanganese tetraoxide composite material, carbon black, binder and deionized water is 100:2:4:113. The obtained negative electrode slurry is uniformly coated on the metal current collector, and the coating thickness is controlled to be 50-60 μm, then dried, pressed into tablets, and punched to obtain a negative electrode sheet that can be used as a negative electrode of a lithium ion battery. Assemble the battery with the positive plate of the ionic lithium battery, conduct a test, carry out charge and discharge cycles at a current density of 100mAh / g, te...

Embodiment 3

[0031] A preparation method of manganese dioxide-trimanganese tetraoxide composite material, comprising the following steps:

[0032] 1) After mixing 10ml 0.05mol / L potassium permanganate solution and 10ml 0.5mol / L manganese sulfate solution, the molar ratio of potassium permanganate and manganese sulfate is 1:10, add 2ml ethylene glycol under ultrasonic conditions, Ultrasonic disperse for 30min and mix well to obtain a mixed solution;

[0033] 2) Add 0.365gCTAB and 0.5ml of 25wt% ammonia water to the mixed system prepared in step 1), mix well, seal, and heat to 165°C for 10h reaction; after the reaction, wash, dry, and cool to room temperature, that is have to.

[0034] A manganese dioxide-trimanganese tetraoxide composite material is prepared by the above method. The composite material has a uniform size and is a nano-sized nano-rod structure. The diameter of the nano-rod is 5-80nm and the length is 50-1000nm.

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Abstract

The invention provides a manganese dioxide-trimanganese tetraoxide composite material, a preparation method and its application. Potassium permanganate solution and manganese sulfate solution are used, CTAB and ammonia water are added, and in the environment of water and polyhydric alcohol, redox A uniform nano-sized nanorod structure is obtained, the diameter of the nanorod is 5-80nm, and the length is 50-1000nm. Compared with the prior art, the nano-scale rod-like structure produced by the present invention can prevent pulverization or agglomeration during charging and discharging, and the nano-size is conducive to improving the specific capacity, and the rod-like structure increases the electron conductivity of the electrode, so the capacity fades slowly. Has excellent cycle performance. When the current density is 100mA / g, the constant current charge and discharge, the first discharge specific capacity is 851mAh / g, and it is still greater than 750mAh / g after 100 cycles.

Description

technical field [0001] The invention belongs to the field of battery negative electrode material preparation, and in particular relates to a manganese dioxide-trimanganese tetraoxide composite material, a preparation method and an application thereof. Background technique [0002] Lithium-ion battery is a small secondary battery widely used at present, which has the advantages of high specific energy, high working voltage, low self-discharge rate, long cycle life, and no pollution. The negative electrode materials of lithium-ion batteries mainly include carbon materials, metal oxides, alloy materials, etc. [0003] Although the capacity of metal oxide anode materials is higher than that of commercial carbon anode materials, they are inferior to carbon materials in terms of cycle stability and have low rate capability. Therefore, how to improve the cycle stability and rate performance of metal oxide anode materials is a crucial issue in the development of metal oxide anode m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/1391H01M4/04H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/0404H01M4/1391H01M4/362H01M4/505H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner 王建存
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