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Graphene-manganese dioxide flower-ball-shaped negative electrode material as well as preparation method and application thereof

A manganese dioxide flower, negative electrode material technology, applied in chemical instruments and methods, manganese oxide/hydroxide, negative electrode and other directions, to achieve distinct structural features, improve cycle performance and rate performance, and promote ion diffusion.

Active Publication Date: 2021-04-23
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the deficiencies in the prior art, the object of the present invention is to provide a graphene-manganese dioxide flower-shaped negative electrode material, its preparation method and application. Manganese dioxide is flower-shaped and has a large specific surface area, which can increase the surface area. Lithium storage capacity; and by doping elements, the diffusion rate of lithium ions can be improved and its rate performance can be improved. Composite graphene can overcome the shortcoming of poor conductivity of manganese dioxide and improve its specific capacity under high current discharge conditions

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  • Graphene-manganese dioxide flower-ball-shaped negative electrode material as well as preparation method and application thereof
  • Graphene-manganese dioxide flower-ball-shaped negative electrode material as well as preparation method and application thereof
  • Graphene-manganese dioxide flower-ball-shaped negative electrode material as well as preparation method and application thereof

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Embodiment 1

[0069] This embodiment provides a graphene-manganese dioxide rosette negative electrode material, the negative electrode material includes graphene, and manganese dioxide loaded on the surface of the graphene in a flower shape, and the negative electrode material is also doped with tungsten element and bismuth. The mass fraction of tungsten element is 0.3%, the mass fraction of bismuth element is 3%, and the average diameter of manganese dioxide is 900nm.

[0070] This embodiment also provides a method for preparing the above-mentioned graphene-manganese dioxide flower spherical negative electrode material, and the preparation method specifically includes the following steps:

[0071] (I) Graphene and concentration are the acidic solution ultrasonic dispersion 30min of 1mol / L to obtain the graphene dispersion liquid that concentration is 12mg / ml after 30min, add the potassium permanganate solution that concentration is 0.9mol / ml under stirring condition, carry out Heating and...

Embodiment 2

[0074] This embodiment provides a graphene-manganese dioxide rosette negative electrode material, the negative electrode material includes graphene, and manganese dioxide loaded on the surface of the graphene in a flower shape, and the negative electrode material is also doped with tungsten element and bismuth. The mass fraction of tungsten element is 0.1%, the mass fraction of bismuth element is 1.0%, and the average diameter of manganese dioxide is 850nm.

[0075] This embodiment also provides a method for preparing the above-mentioned graphene-manganese dioxide flower spherical negative electrode material, and the preparation method specifically includes the following steps:

[0076] (I) Graphene and concentration are the acidic solution ultrasonic dispersion 30min of 1mol / L to obtain the graphene dispersion liquid that concentration is 6mg / ml after 30min, add the potassium permanganate solution that concentration is 1.2mol / ml under stirring condition, carry out Heating an...

Embodiment 3

[0079] This embodiment provides a graphene-manganese dioxide rosette negative electrode material, the negative electrode material includes graphene, and manganese dioxide loaded on the surface of the graphene in a flower shape, and the negative electrode material is also doped with tungsten element and bismuth. The mass fraction of tungsten element is 0.2%, the mass fraction of bismuth element is 2.5%, and the average diameter of manganese dioxide is 950nm.

[0080] This embodiment also provides a method for preparing the above-mentioned graphene-manganese dioxide flower spherical negative electrode material, and the preparation method specifically includes the following steps:

[0081](I) Graphene and concentration are the acidic solution ultrasonic dispersion 30min of 1mol / L to obtain the graphene dispersion liquid that concentration is 8mg / ml after 30min, add the potassium permanganate solution that concentration is 0.8mol / ml under stirring condition, carry out Heating and...

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Abstract

The invention provides a graphene manganese dioxide flower-ball-shaped negative electrode material as well as a preparation method and application thereof. The negative electrode material comprises graphene and flower-ball-shaped manganese dioxide loaded on the surface of the graphene, and the negative electrode material is also doped with doping elements. The manganese dioxide is flower-ball-shaped, large in specific surface area, distinct in structural characteristic and excellent in electrochemical performance. In addition, through the doping elements, the ion migration capability of the material can be improved, the stability of the material structure is improved, the gram volume exertion is improved, the battery polarization is reduced, the lithium ion transport channel is expanded, the cycle performance and the rate capability of the battery are further improved, and the method has the characteristics of simple process, easiness in operation and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a graphene-manganese dioxide flower spherical negative electrode material, in particular to a graphene-manganese dioxide flower spherical negative electrode material, a preparation method and an application thereof. Background technique [0002] The rapid development of the global lithium battery industry has promoted the demand for lithium battery anode materials. Driven by the gradual transformation of power batteries to high energy density, lithium ion battery anode materials will show a high-end trend in the future, and will move towards high energy density and high energy density. With the development of rate performance and high cycle performance, traditional graphite anode materials will not be able to meet all these. [0003] Silicon negative electrodes and metal oxides have greater lithium storage capacity, but due to poor conductivity, and the particles are ...

Claims

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Application Information

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IPC IPC(8): H01M4/50H01M4/62H01M10/0525C01B32/194C01G45/02
CPCH01M4/502H01M4/625H01M4/628H01M10/0525C01B32/194C01G45/02C01P2004/80C01P2004/30C01P2004/03C01P2004/62C01P2004/32C01P2006/40H01M2004/021H01M2004/027Y02E60/10
Inventor 聂荣健王守兵吕睿陈岩李树人
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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