Manganese cobalt oxide hollow microsphere material and preparation method

A hollow microsphere, manganese cobalt oxide technology, applied in nanotechnology, electrical components, electrochemical generators for materials and surface science, etc., can solve the problems of poor cycle performance and too fast capacity decay, and achieve simple equipment. , The process is simple, the effect of improving the morphology and structure

Active Publication Date: 2015-06-24
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 cycle performance is poor, and the capacity fades too fast, which has become the primary problem that limits their practical application.

Method used

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  • Manganese cobalt oxide hollow microsphere material and preparation method
  • Manganese cobalt oxide hollow microsphere material and preparation method
  • Manganese cobalt oxide hollow microsphere material and preparation method

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Experimental program
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Embodiment 1

[0029] Add 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 0.03 mol of urea, mix well, transfer the solution to a hydrothermal reactor, and heat at 90°C for 8 hours. After opening the kettle, the precipitate was centrifuged and washed several times with deionized water and alcohol, and then dried at 80°C. The precursor was placed in a muffle furnace at a heating rate of 1°C / min to 600°C, and then kept for 4 hours to calcinate to obtain hollow microsphere materials assembled from manganese cobaltate nanoneedles. The SEM photo of the prepared manganese cobaltate hollow microsphere material is as follows figure 1 It shows that the prepared product has a hollow structure and is assembled by nanoneedles. The diameter of the nanoneedles is small (≤30nm), the size is uniform, and the diameter of the hollow microspheres is on the micron level (≤6μm). At 200mAg -1 Test its performance under the current ...

Embodiment 2

[0031] Add 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 0.72mol of urea, mix well, transfer the solution to a hydrothermal reactor, and heat it at 110°C for 10h. After opening the kettle, the precipitate was centrifuged and washed several times with deionized water and alcohol, and then dried at 70°C. The precursor was placed in a muffle furnace at a heating rate of 2°C / min to 600°C, and then kept for 5 hours to calcinate to obtain a manganese cobaltate hollow microsphere material. The X-ray diffraction pattern of the prepared manganese cobaltate hollow microsphere material is as follows figure 2 It shows that the prepared product has a pure composition. At 100mAg -1 Test its performance under the current density of, the first discharge capacity can reach 1400mAhg -1 Above, its specific capacity can still reach 750mAhg after 25 cycles -1 the above.

Embodiment 3

[0033] Add 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 0.003mol of urea, mix well, transfer the solution to a hydrothermal reactor, and heat it at 130°C for 12h. After opening the kettle, the precipitate was centrifuged, washed several times with deionized water and alcohol, and then dried at 60°C. The precursor was placed in a muffle furnace at a heating rate of 3°C / min to 600°C, and then kept for 6 hours to calcinate to obtain a manganese cobaltate hollow microsphere material. The SEM photo of the prepared manganese cobaltate hollow microsphere material is as follows image 3 It shows that the prepared product is a hollow microsphere structure assembled by nanoneedles. The diameter of the nanoneedles is small (≤30nm), the size is uniform, and the diameter of the hollow microspheres is on the micron level (≤6μm). At 50mAg -1 Test its performance under the current density of, the first dis...

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Abstract

The invention provides a manganese cobalt oxide hollow microsphere material and a preparation method. The preparation method comprises the following steps: dissolving Mn(NO3)2 and Co(NO3)2.6H2O in deionized water, adding with anhydrous ethanol, and uniformly mixing the anhydrous ethanol and the deioinzed water; adding urea into the solution, transferring the mixed solution into a hydrothermal reaction kettle, and facilitating the reaction; centrifugally separating precipitates, washing the precipitates by utilizing deionized water and alcohol, and then drying the precipitates; and placing the precipitates in a muffle furnace, heating the muffle furnace to 600 DEG C, preserving the heat for 4 to 6 hours, and calcining the precipitates to obtain the hollow microsphere material assembled by manganese cobalt oxide nanoneedles. The diameter of the prepared manganese cobalt oxide nanoneedle is less than or equal to 30nm, and the diameter of the hollow microsphere is micron-sized (less than or equal to 6 micrometers). The manganese cobalt oxide hollow microsphere material is used as a lithium ion battery anode material, due to the special hollow structure, the cycling performance of the lithium ion battery can be improved, the performance is tested under the current density of 50 to 200 mAg<-1>, the primary discharging capacity can reach more than 1400mAhg<-1>, and the specific capacity still reach more than 750mAhg<-1> after the lithium ion battery is cycled for 25 times.

Description

Technical field [0001] The invention belongs to the field of inorganic nano material synthesis. More specifically, it relates to a material and method for preparing hollow microspheres assembled from manganese cobaltate nanoneedles by using a mineralizer hydrothermal method. Background technique [0002] Manganese Cobaltate (MnCo 2 O 4.5 ) The material is a negative electrode material used in lithium-ion batteries. A comparison of previously reported composite metal oxide materials found that whether it is cycle performance or charge-discharge performance, MnCo 2 O 4.5 The performance is better. Compared with simple metal oxides, due to the complementary and synergistic effects of the two metals, the capacity of composite metal oxides is often higher than the theoretical capacity calculated according to the conversion reaction mechanism, and the electrical conductivity of composite oxides is also better. Therefore, MnCo 2 O 4.5 As a negative electrode material with great develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/52H01M10/0525Y02E60/10
Inventor 孙晓红张思敏杨以娜郑春明
Owner TIANJIN UNIV
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