Manganese dioxide/graphene lithium ion battery cathode material and preparation method thereof

A lithium-ion battery, manganese dioxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low capacity and unstable cycle performance of manganese dioxide/graphene materials, saving time and cost , The preparation process is simple and the operability is strong

Inactive Publication Date: 2015-09-09
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the capacity of the currently prepared manganese dioxide/graphene materials is not high, and the cycle performance i

Method used

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  • Manganese dioxide/graphene lithium ion battery cathode material and preparation method thereof
  • Manganese dioxide/graphene lithium ion battery cathode material and preparation method thereof
  • Manganese dioxide/graphene lithium ion battery cathode material and preparation method thereof

Examples

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Example Embodiment

[0052] The manganese dioxide / graphene (MnO 2 / GF) Lithium-ion battery anode material and its preparation method. The preparation method includes the following steps:

[0053] (1) Preparation of three-dimensional graphene foam by chemical vapor deposition method;

[0054] (2) Add potassium permanganate and manganese sulfate monohydrate to ultrapure water and stir evenly to obtain a mixed solution;

[0055] (3) Add the mixed solution to the inner tank of a high-temperature-resistant closed stainless steel reactor, and then add the three-dimensional graphene foam prepared in step (1) to the inner tank of the stainless steel reactor, and then tighten the stainless steel reactor. Heat in a program-controlled oven and maintain a constant temperature to separate the reacted compound;

[0056] (4) The composite obtained in step (3) is washed with water and ethanol, dried in vacuum, and then annealed at a constant temperature under gas conditions to prepare a manganese dioxide / graphene lithiu...

Example Embodiment

[0057] Example one:

[0058] (1) 0.60 mg of three-dimensional graphene foam was prepared by chemical vapor deposition.

[0059] (2) Take 0.4mmol of potassium permanganate and 0.15mmol of manganese sulfate monohydrate, add 20mL of ultrapure water and stir evenly to form a mixed solution.

[0060] (3) Add the mixed solution to the inner bladder of a sealed stainless steel reactor with high temperature resistance, then add the three-dimensional graphene foam prepared in step (1) to the inner bladder of the stainless steel reactor, and then tighten the stainless steel reactor and place it in The program controls the oven to heat to 140°C and keep it at constant temperature for 12h. Separate the resulting complex from the reaction.

[0061] (4) Wash the composite obtained in step (3) with water and ethanol, and then vacuum dry, and then put it in an argon gas flow of 100sccm and annealed at 450℃ for 2h to prepare a manganese dioxide / graphene lithium ion battery composite Negative materia...

Example Embodiment

[0067] Embodiment two:

[0068] (1) 0.80 mg of three-dimensional graphene foam was prepared by chemical vapor deposition.

[0069] (2) Take 2mmol of potassium permanganate and 0.5mmol of manganese sulfate monohydrate, add 50mL of ultrapure water and stir evenly to obtain a mixed solution.

[0070] (3) Add the mixed solution to the inner tank of a high-temperature-resistant closed stainless steel reactor, then add the three-dimensional graphene foam prepared in step (1) to the inner tank of the stainless steel reactor, and then tighten the stainless steel reactor and place it in the program In a controlled oven, heat to 100°C and keep at a constant temperature for 20 hours to separate the compound obtained from the reaction.

[0071] (4) The composite obtained in step (3) was washed with water and ethanol, dried in vacuum, and then placed in an air flow of 300sccm and annealed at 100°C for 4h to prepare a manganese dioxide / graphene lithium ion battery composite Negative material.

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Abstract

The invention discloses a manganese dioxide/graphene lithium ion battery cathode material and a preparation method thereof, which belongs to the new energy and material fields. The preparation method comprises the following steps: 1)preparing three-dimensional graphene bubble; 2)adding potassium permanganate and manganese sulfate monohydrate in ultrapure water and uniformly stirring to obtain a mixing solution; 3)adding the three-dimensional graphene bubble and the mixing solution in an inner container of a high temperature-resistance enclosed stainless steel reaction vessel, tightly screwing the stainless steel reaction vessel and placing in a program control baking oven for heating treatment, separating to obtain a compound; and 4)washing, drying under vacuum and annealing under constant temperature to obtain the manganese dioxide/graphene lithium ion battery cathode material. According to the invention, the method has no damage on graphene, excellent conductivity of graphene can be influenced; the product can be directly used for assembling a battery, no extra current collector is required, and no binder and conductive agent is added; the preparation process is simple, and operationality is strong.

Description

technical field [0001] The invention belongs to the field of new energy and materials, relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a manganese dioxide / graphene (MnO 2 / GF) Lithium-ion battery negative electrode material and its preparation method. Background technique [0002] With the depletion of resources such as coal, oil and natural gas, and the rapid development of new energy sources such as solar energy and wind energy, only the development of high-performance storage devices or materials can meet the growing demand. Compared with secondary batteries such as lead-acid, nickel-cadmium, and nickel-metal hydride, lithium-ion batteries have the advantages of high open circuit voltage, high energy density, long cycle life, no memory effect, and low pollution. They are widely used in various portable mobile devices and electric transportation. tools are widely used. [0003] Graphite is a commercial negat...

Claims

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Application Information

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IPC IPC(8): H01M4/50H01M4/62
CPCH01M4/50H01M4/625H01M10/0525Y02E60/10
Inventor 邓璟雯
Owner WUHAN UNIV
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