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Preparation process of a flexible electrode with long cycle life and high specific capacity

A high specific capacity, flexible electrode technology, applied in the direction of battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of complex and cumbersome preparation methods, short cycle life, and low energy density, and achieve simple and easy process, long-term Effect of cycle life and high specific surface area

Active Publication Date: 2021-10-26
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the preparation method of flexible electrodes with long cycle life and high energy density is complex and cumbersome, and the cost is high; and the prepared electrodes are not flexible, the cycle life is still short, and the energy density is low

Method used

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  • Preparation process of a flexible electrode with long cycle life and high specific capacity
  • Preparation process of a flexible electrode with long cycle life and high specific capacity
  • Preparation process of a flexible electrode with long cycle life and high specific capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 300mg of commercial multi-walled carbon nanotubes and put them into a sand core, put the sand core and 5ml of concentrated nitric acid into the reaction kettle and put them into the iron shell, then transfer them to a hydrothermal furnace for acidification treatment at 200°C for 2 hours, and the acidified multi-walled carbon nanotubes The carbon nanotubes are cleaned and dried. Weigh 40 mg of acid-treated multi-walled carbon nanotubes and 1 mmol of manganese sulfate hexahydrate into a beaker, add 50 ml of water for stirring, pulverization and ultrasonication to fully disperse them, stir for 1 hour, add 3 mmol of ammonium bicarbonate, and Stirring was continued for 3 hours, followed by vacuum filtration and vacuum freeze-drying, and the obtained flexible film was annealed in a tube furnace at 600°C for 3 hours in argon to form a flexible composite electrode of manganese oxide quantum dots and multi-walled carbon nanotubes.

[0033] The specific properties of the pr...

Embodiment 2

[0042] Weigh 300mg of commercial multi-walled carbon nanotubes and put them into a sand core, put the sand core and 5ml of concentrated nitric acid into the reaction kettle and put them into the iron shell, then transfer them to a hydrothermal furnace for acidification treatment at 200°C for 2 hours, and the acidified multi-walled carbon nanotubes The carbon nanotubes are cleaned and dried. Weigh 40 mg of acid-treated multi-walled carbon nanotubes and 1 mmol of manganese sulfate hexahydrate into a beaker, add 50 ml of water for stirring, pulverization and ultrasonication to make it fully dispersed, and after stirring for 1 hour, add 3 mmol of ammonium bicarbonate, Stirring was continued at 0°C for 3 hours, followed by vacuum filtration and vacuum freeze-drying, and the obtained flexible film was annealed in a tube furnace at 700°C in argon for 4 hours to form a flexible composite of manganese oxide quantum dots and multi-walled carbon nanotubes electrode.

[0043] Specific pr...

Embodiment 3

[0045] Weigh 300mg of commercial multi-walled carbon nanotubes and put them into a sand core, put the sand core and 5ml of concentrated nitric acid into the reaction kettle and put them into the iron shell, then transfer them to a hydrothermal furnace for acidification treatment at 200°C for 2 hours, and the acidified multi-walled carbon nanotubes The carbon nanotubes are cleaned and dried. Weigh 40 mg of acid-treated multi-walled carbon nanotubes and 1 mmol of manganese sulfate hexahydrate into a beaker, add 50 ml of water for stirring, pulverization and ultrasonication to make it fully dispersed, and after stirring for 1 hour, add 3 mmol of ammonium bicarbonate, Stirring was continued at 0°C for 4 hours, followed by vacuum filtration and vacuum freeze-drying, and the obtained flexible film was annealed in a tube furnace at 600°C for 3 hours to form a flexible composite of manganese oxide quantum dots and multi-walled carbon nanotubes electrode.

[0046] The specific propert...

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Abstract

The invention relates to a preparation process of a flexible electrode with long cycle life and high specific capacity, which comprises the following steps: (1) acid treatment of multi-walled carbon nanotubes; (2) preparation of the electrode: manganese source and The treated multi-walled carbon nanotubes are mixed and dispersed in the solution according to a predetermined ratio, and the manganese ions in the manganese source are adsorbed on the multi-walled carbon nanotubes through electrostatic interaction at a predetermined temperature, and then carbonate solution is added for a predetermined time of reaction Generate manganese carbonate anchored on the multi-walled carbon nanotubes, and then perform vacuum filtration and drying to form a flexible film. Finally, the flexible film is reacted at a predetermined temperature and an inert gas atmosphere for a predetermined time to decompose the manganese carbonate to form manganese oxide. The preparation method of the present invention is simple and easy, the raw materials used are low in price, and the prepared product has good flexibility and high active material content, and when used as a flexible negative electrode of a lithium battery, it exhibits long cycle life and high specific capacity.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a preparation process of a flexible electrode with long cycle life and high specific capacity. Background technique [0002] With the progress and development of human society, people's demand for lithium-ion batteries is increasing, and at the same time, the requirements for lithium-ion batteries are also getting higher and higher. In particular, the development of new energy vehicles requires lithium-ion batteries to have high energy density and long cycle life, and today's smart wearable devices require lithium-ion batteries to be flexible, and these requirements largely depend on electrode materials. At present, the anode material of lithium-ion batteries for commercial application is mainly graphite, but the theoretical specific capacity of graphite material is low and its flexibility is poor, which cannot meet the application requirements ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01M4/36H01M4/58H01M4/62H01M4/66H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 魏晓林黄首吉杨利文张祺曹觉先
Owner XIANGTAN UNIV
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