Carbon-coated MnOx nano energy storage material with one-dimensional core-shell structure and preparation method thereof

A technology of shell-core structure and energy storage material, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems that affect the application and development of manganese oxide materials, cannot effectively eliminate cycle performance, and have limited specific surface area of ​​manganese oxide materials. , to achieve good cycle performance, prevent agglomeration effect, high capacity effect

Inactive Publication Date: 2015-03-04
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, most of the manganese oxide-containing materials mentioned in the literature or patents cannot effectively eliminate the decline in their cycle performance in theory, thus affecting the application and development of manganese oxide materials in lithium batteries
At the same time, the preparation methods of manganese oxide compounded with other materials in the current patent are relatively complicated, and the prepared manganese oxide material has limited specific surface area and poor conductivity, which has limited effect on improving its lithium storage performance.

Method used

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  • Carbon-coated MnOx nano energy storage material with one-dimensional core-shell structure and preparation method thereof
  • Carbon-coated MnOx nano energy storage material with one-dimensional core-shell structure and preparation method thereof
  • Carbon-coated MnOx nano energy storage material with one-dimensional core-shell structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Weigh 1.64g of manganese acetate pentahydrate, 1.59g of potassium persulfate, and 2.47g of ammonium nitrate into 10ml, 20ml, and 10ml of deionized water, respectively, sonicate for 10min, mix the solution and sonicate for 10min, and transfer to 60ml of water Thermal reaction kettle, placed in an oven for heat treatment at 140°C for 12h, cooled, washed with deionized water and alcohol in sequence, and dried in an oven at 50°C for 24h to obtain MnO 2 Nanowires; figure 2 for MnO 2 SEM images of nanowires;

[0024] 2) Weigh 0.7g PVP and dissolve it in 20ml ethanol, stir to a uniform solution, then weigh 0.5g MnO in step 1) 2 The nanowires were dispersed into PVP ethanol solution, ultrasonicated for 2 hours, filtered and dried for 12 hours, and the MnO distributed in PVP could be obtained. 2 Nanowires; image 3 MnO distributed in PVP 2 SEM images of nanowires;

[0025] 3) Weigh 0.8g of MnO distributed in PVP in step 2) 2 The nanowires are placed in a tube furnace ...

Embodiment 2

[0027] 1) Weigh 2.45g of manganese acetate pentahydrate, 2.38g of potassium persulfate, and 2.44g of ammonium nitrate into 10ml, 30ml, and 10ml of deionized water, respectively, and mark them as A, B, and C respectively. Ultrasound A, B, and C Mix after 10 minutes, transfer to an 80ml hydrothermal reaction kettle, place in an oven for heat treatment at 120°C for 12h, cool, wash with deionized water, alcohol, deionized water, and alcohol four times in sequence, and place in an oven at 75°C Dry for 24h to get MnO 2 Nanowires;

[0028] 2) Dissolve 0.8g of PVP in 25ml of ethanol, stir for 1h, then weigh the MnO in step 1) 2 Disperse 0.7g of nanowires into the PVP ethanol solution, sonicate for 2h and then let it stand for 1h, filter and dry to obtain MnO distributed in PVP 2 Nanowires;

[0029] 3) Weigh 1.0g of MnO distributed in PVP in step 2) 2 The nanowires are placed in a tube furnace under the protection of nitrogen, heat-treated at 550°C for 3 hours, and cooled to obtain...

Embodiment 3

[0031] 1) Dissolve 2mmol of manganese acetate pentahydrate, 2mmol of potassium persulfate, and 3mmol of ammonium nitrate into 20ml, 35ml, and 15ml of deionized water respectively, mix them after ultrasonic treatment for 10 minutes, and transfer them to a 100ml hydrothermal reaction kettle after ultrasonic treatment for 10 minutes. Heat treatment in an oven at 160°C for 12h, after cooling, wash with deionized water and alcohol in turn, and then dry in an oven at 50°C for 48h to obtain MnO 2 Nanowires;

[0032] 2) Dissolve 1.2g of PVP in 40ml of ethanol, then take the MnO in step 1) 2 Nanowire structure material 0.8g, dispersed in it under the condition of stirring, sonicated for 2h, filtered and dried to obtain MnO distributed in PVP 2 Nanowires;

[0033] 3) Distribute MnO in PVP in step 2) 2 The nanowires are heat-treated at 600°C for 3 hours in a tube furnace under an Ar atmosphere, and after cooling to room temperature, the one-dimensional core-shell structure carbon-coat...

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Abstract

The invention discloses a carbon-coated MnOx nano energy storage material with a one-dimensional core-shell structure and a preparation method thereof. The energy storage material with a one-dimensional core-shell structure, which takes amorphous carbon as a shell and a MnOx nanowire as a core, is prepared by using a hydrothermal method through the processes of suction filtration, ultrasonic treatment, heat treatment, soaking and the like. According to the invention, the preparation processes are simple, and the prepared material has the advantages of high specific surface area, good electrical conductivity, good structure stability and good electrochemical cycle performance, and has a great application potential in the field of negative electrode materials for lithium secondary batteries.

Description

technical field [0001] The invention belongs to the field of new energy nano energy storage materials, in particular to a one-dimensional core-shell structure carbon-coated MnO x Nano energy storage material and its preparation method. Background technique [0002] With the depletion of traditional energy sources, lithium-ion secondary batteries as a representative of new energy sources have received more and more attention. At the same time, as the main power supply of mobile communication equipment and portable electronic equipment, it has become a hot research topic at home and abroad because of its excellent performance such as high output voltage and high energy density. In order to meet the needs of high-power, high-capacity communication equipment and electronic equipment, domestic and foreign experts have been committed to researching lithium-ion battery electrode materials with high capacity, good stability, economy, and environmental protection. Among them, mangan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/50
CPCY02E60/10
Inventor 杨尊先
Owner FUZHOU UNIV
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