Manganese dioxide-manganese tetroxide composite material, preparation method and application thereof

A technology of manganese tetroxide composite material and manganese dioxide, which is used in nanotechnology for materials and surface science, electrode manufacturing, secondary batteries, etc., can solve the problems of low rate performance and cycle stability less than carbon materials. , to achieve the effect of slow capacity decay, rich hydroxyl and sufficient mixing

Active Publication Date: 2018-12-07
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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  • Manganese dioxide-manganese tetroxide composite material, preparation method and application thereof

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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 evenly 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 lithium ion battery negative electrode. 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, test the c...

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 nanorod structure. The diameter of the nanorod is 5-80nm and the length is 50-1000nm.

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Abstract

The invention provides a manganese dioxide. Manganese tetroxide composite material, preparation method and application thereof, utilize potassium permanganate solution and manganese sulfate solution,add CTAB and ammonia water, under the environment of water and polyol, redox to obtain uniform nano-size nanorod structure, nanorod diameter of 5-80 nm, length 50-1000nm. Compared with the prior art,the nanometer rod structure produced by the invention can prevent pulverization or agglomeration in the charging and discharging process, and the nanometer size is favorable for improving the specificcapacity, and the rod structure increases the electron conductivity of the electrode, so that the capacity attenuation is slow, and the nanometer rod structure has excellent cycling performance. Whenthe current density is 100 mA/g, the specific capacity of the first discharge is 851 mAh/g, and it is still more than 750 mAh/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 Applications(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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