Preparation method of self-support lithium ion battery cathode material

A technology for lithium-ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low initial Coulomb efficiency, poor thermodynamic stability, and volume expansion during charge and discharge, and achieve excellent electrochemical performance and mechanical stability. The effect of high performance and high magnification characteristics

Inactive Publication Date: 2015-10-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MnO x As an electrode material for lithium-ion batteries, there are problems of low capacity utilization, poor rate performance, and poor cycle stability, mainly due to poor conductivity and volume expansion during charging and discharging.
[0004] In order to solve the above problems, scientific researchers have proposed two methods of nanotechnology and compounding. The former still has problems such as low first-time Coulombic efficiency, poor thermodynamic stability, and unstable structure, while the latter mainly uses carbon materials to compound, such as graphene and carbon. Nanotubes, but graphene and carbon nanotubes are expensive, which limits their further industrial development

Method used

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  • Preparation method of self-support lithium ion battery cathode material
  • Preparation method of self-support lithium ion battery cathode material
  • Preparation method of self-support lithium ion battery cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Weigh 4mmol of manganese sulfate, 6mmol of potassium chlorate, 7mmol of potassium acetate and 4mL of acetic acid into 60mL of deionized water. After fully stirring and dissolving, transfer the solution into a hydrothermal kettle with a capacity of 100mL, and put the hydrothermal kettle into a drying oven heated to 160°C for 12 hours, and cooled naturally to room temperature after the completion of the hydrothermal reaction to obtain U-MnO 2 , washed three times with deionized water and absolute ethanol, and the obtained U-MnO 2 The self-supporting film was dried at 90°C for 24 hours, and the picture of the self-supporting film is attached figure 1 , where (a) is a self-supporting film with a diameter of 50 mm, and (b) is a picture of the self-supporting film after being folded twice, which shows that it has high mechanical strength and toughness. U-MnO 2 The scanning electron microscope picture is attached figure 2 as shown in (a);

[0029] 2) Weigh 200mg of U-M...

Embodiment 2

[0032] 1) Weigh 20mmol of manganese sulfate and 20mmol of ammonium persulfate into 80mL of deionized water, stir evenly, then add 50mmol of ammonium sulfate, stir for 30min, transfer the solution into a hydrothermal kettle with a capacity of 100mL, put the hydrothermal kettle into Put it in a drying oven and heat it to 180°C for 12 hours, and then cool it down to room temperature naturally after the hydrothermal reaction is completed, to obtain U-MnO 2 . Use ultrapure water and absolute ethanol to wash 3 times respectively, and the U-MnO obtained by suction filtration 2 Dry the self-supporting film at 90°C for 24h;

[0033] 2) Weigh 200mg of U-MnO prepared in step 1) 2 , add it to 20mL 0.1M HCl, stir evenly, then add 60μL pyrrole, stir at room temperature for 30min and let it stand for 4h to get U-MnO 2 Polypyrrole was washed three times with ultrapure water and absolute ethanol, filtered to form a film, and dried in vacuum at 60°C for 12 hours;

[0034] 3) U-MnO prepared ...

Embodiment 3

[0036] 1) Weigh 6mmol of manganese nitrate, 8mmol of potassium chlorate, 8mmol of potassium acetate and 4mL of acetic acid and add them into 90mL of ultrapure water. Heat it in the box to 160°C for 16 hours, cool it down to room temperature naturally after the hydrothermal reaction, and get U-MnO 2 , washed three times with ultrapure water and absolute ethanol, and the U-MnO obtained by suction filtration 2 The self-supporting film was air-dried at 90°C for 48 hours;

[0037] 2) Weigh 200mg of U-MnO prepared in step 1) 2 , which was added to 40mL 0.1M HNO 3 , stirred evenly, then added 80 μL of thiophene, stirred at room temperature for 60 minutes, and left to react for 4 hours to obtain U-MnO 2 Polythiophene, washed 3 times with ultrapure water and absolute ethanol, filtered to form a film and dried in vacuum at 60°C for 24 hours;

[0038] 3) U-MnO prepared in step 2) 2 Polythiophene, placed in a tube furnace, at N 2 (120sccm) atmosphere, heat up to 700°C at a heating rat...

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Abstract

The invention relates to a preparation method of a self-support lithium ion battery cathode material. The method includes: making a manganese salt, an oxidant and a solvent into an ultralong one-dimensional manganese dioxide (U-MnO2) nanowire by a hydrothermal technique, dispersing the U-MnO2 in an acidic solution and adding a proper amount of an organic monomer to obtain a U-MnO2@high polymer compound, carrying out cleaning, pumping filtration and drying to obtain a self-support membrane, and carrying out high temperature heat treatment to obtain the self-support carbon coated MnO(MnO@C) electrode material. The MnO@C prepared by the method can be directly used as the cathode material of a lithium ion battery without additional current collector, conductive additive and binder. The material has the characteristics of simple preparation process, high structure stability, self-current collection, excellent electrochemical performance and the like.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, and in particular relates to a preparation method of a self-supporting lithium-ion battery negative electrode material, in particular to a composite method of an active material and a carbon material. Background technique [0002] In recent years, a series of energy crises and environmental problems such as fossil energy decay, climate warming, and environmental pollution have seriously threatened the survival and development of human beings. New energy has been widely used due to its green environmental protection and recyclable characteristics development and utilization. As a representative of new energy sources, lithium-ion batteries have been widely used in the fields of portable electronic devices and electric vehicles due to their advantages such as high working voltage, high energy density, low self-discharge rate, long cycle life, no memory effect, and environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/50H01M10/0525
CPCH01M4/50H01M4/625H01M10/0525Y02E60/10
Inventor 王建淦张存宝谢科予魏秉庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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