Manganese cobaltate octahedral nanomaterial and preparation method thereof

A manganese cobalt oxide nano and octahedral technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as rapid capacity decay, and achieve the effects of improving battery performance, improving size, and increasing contact area.

Active Publication Date: 2015-07-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the currently prepared composite oxide anode materials with different morphologies have high capacity, their capacity fades too fast, which has become the primary problem that limits their practical application.

Method used

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  • Manganese cobaltate octahedral nanomaterial and preparation method thereof
  • Manganese cobaltate octahedral nanomaterial and preparation method thereof
  • Manganese cobaltate octahedral nanomaterial and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0025] 0.002molMn(NO 3 ) 2 , 0.004Co(NO 3 ) 2 ·6H 2 Dissolve O in 12ml of deionized water, add 24ml of absolute ethanol, and mix well. Add 0.024 mol of polyethylene glycol monooctyl phenyl ether, mix well, transfer the solution to a hydrothermal reaction kettle, and heat at 120° C. for 12 hours. After the kettle was opened, the precipitate was separated by centrifugation, washed several times with deionized water and alcohol, and then dried at 60°C to obtain the manganese cobaltate nano-octahedral material. The scanning electron micrograph of the prepared manganese cobaltate is as follows figure 1 As shown, it shows that the prepared product has a nano-octahedral structure, and the size is uniform and less than or equal to 400nm. at 200mAg -1 Test its performance under the current density, the first discharge capacity can reach 1400mAhg -1 Above, its specific capacity can still reach 750mAhg after 25 cycles -1 above.

Embodiment 2

[0027] 0.002molMn(NO 3 ) 2 , 0.004Co(NO 3 ) 2 ·6H 2 Dissolve O in 18ml of deionized water, add 18ml of absolute ethanol, and mix well. Add 0.006 mol of polyethylene glycol monooctyl phenyl ether, mix well, transfer the solution to a hydrothermal reaction kettle, and heat at 150° C. for 10 h. After opening the kettle, the precipitate was separated by centrifugation, washed several times with deionized water and alcohol, and then dried at 70°C to obtain the manganese cobaltate nano-octahedral material. The X-ray diffraction pattern of the prepared manganese cobaltate nano-octahedral material is as follows figure 2 As shown, the prepared product has a pure composition. at 100mAg -1 Test its performance under the current density, the first discharge capacity can reach 1400mAhg -1 Above, its specific capacity can still reach 750mAhg after 25 cycles -1 above.

Embodiment 3

[0029] 0.002molMn(NO 3 ) 2 , 0.004Co(NO 3 ) 2 ·6H 2 Dissolve O in 24ml of deionized water, add 12ml of absolute ethanol, and mix well. Add 0.0015 mol of polyethylene glycol monooctyl phenyl ether, mix well, transfer the solution to a hydrothermal reaction kettle, and heat at 180° C. for 8 hours. After opening the kettle, the precipitate was centrifuged, washed several times with deionized water and alcohol, and then dried at 80°C to obtain the manganese cobaltate nano-octahedral material. The scanning electron micrograph of prepared manganese cobalt oxide material is as follows image 3 As shown, it shows that the prepared product has a nano-octahedral structure, and the size is uniform and less than or equal to 400nm. at 50mAg -1 Test its performance under the current density, the first discharge capacity can reach 1400mAhg -1Above, its specific capacity can still reach 750mAhg after 25 cycles -1 above.

[0030] From the drawings of the above embodiments, it can als...

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Abstract

The invention provides a manganese cobaltate octahedral nanomaterial and a preparation method thereof. The method comprises the following steps: dissolving Mn(NO3)2 and Co(NO3)2.6H2O in deionized water, and adding anhydrous ethanol; adding polyethylene glycol octylphenol ether to the above obtained solution according to a molar ratio of nitrate to polyethylene glycol octylphenol ether of 1:4-1:0.25, transferring the obtained solution to a hydrothermal reaction kettle, and reacting; and opening the kettle, centrifuging, separating the obtained precipitate, washing the precipitate with deionized water and alcohol, and drying at 60-80DEG C to obtain the manganese cobaltate octahedral nanomaterial. The particle dimension of the manganese cobaltate octahedral nanomaterial prepared in the invention is not greater than 400nm. The manganese cobaltate octahedral nanomaterial can be used as a lithium ion battery. Test results show that the first discharge capacity of the manganese cobaltate octahedral nanomaterial under a current density of 50-200mAg<-1> reaches 1400mAhg<-1>, and the specific capacity of the manganese cobaltate octahedral nanomaterial after 25 cycles still reaches above 750mAhg<-1>; and the preparation method has the characteristics of simple operation and energy saving.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic nanometer materials. More specifically, it relates to the preparation of manganese cobaltate nano-octahedral material and method by using surfactant hydrothermal method. Background technique [0002] Manganese cobaltate (MnCo 2 o 4.5 ) material is an anode material used in lithium-ion batteries, MnCo 2 o 4.5 than common MnCo 2 o 4 With 0.5 more O atoms, many vacancies are generated, and the conductivity is good, which overcomes the shortcomings of poor conductivity of other transition metal oxides. MnCo 2 o 4.5 It is a composite oxide of manganese and cobalt, which not only maintains the cycle stability of manganese oxide, but also has the high specific capacity characteristics of cobalt oxide. Using MnCo 2 o 4.5 As a negative electrode material for lithium-ion batteries, it not only has abundant raw material reserves, low price, but also high specific capacity. MnCo 2 o 4.5 Lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 孙晓红张思敏杨以娜郑春明
Owner TIANJIN UNIV
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