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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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  • Summary
  • 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 is unstable. The development of new manganese dioxide / graphene materials and their preparation methods is a current research hotspot.

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

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preparation example Construction

[0052] Manganese dioxide / graphene of the present invention (MnO 2 / GF) Lithium-ion battery negative electrode material and its preparation method. Its preparation method comprises the following steps:

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

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

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

[0056] (4) washing the compound obtained in step (3) with water and ethanol, drying in vacuum, and then annealing at a constant temperature under ga...

Embodiment 1

[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 them into 20mL of ultrapure water and stir evenly to form a mixed solution.

[0060] (3) Add the mixed solution into the high-temperature-resistant closed stainless steel reactor liner, then add the three-dimensional graphene foam prepared in step (1) into the stainless steel reactor liner, and then tighten the stainless steel reactor and place it in the Heating to 140° C. in a program-controlled oven and maintaining the temperature for 12 hours. The resulting complex was isolated from the reaction.

[0061] (4) Wash the compound obtained in step (3) with water and ethanol, then vacuum-dry it, and then put it into annealing at 450°C for 2 hours under the condition of argon gas flow rate of 100 sccm to obtain a manganese dioxide / graphene lithium-ion battery composite Negative mat...

Embodiment 2

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

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

[0070] (3) Add the mixed solution into the high temperature-resistant closed stainless steel reactor inner tank, then add the three-dimensional graphene foam prepared in step (1) into the stainless steel reactor inner tank, then tighten the stainless steel reactor and place it in the program Heating to 100° C. in a controlled oven and maintaining a constant temperature for 20 h, and separating the complex obtained from the reaction.

[0071] (4) The compound obtained in step (3) was washed with water and ethanol, dried in vacuum, and then annealed at 100°C for 4 hours under an air flow rate of 300 sccm to obtain 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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