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Graphene/iron diselenide composite material for lithium ion battery negative electrode material, and preparation method thereof

A technology of lithium-ion batteries and iron diselenide, applied in nanotechnology, graphene, battery electrodes, etc. for materials and surface science, can solve problems such as battery failure, capacity attenuation, and volume change, and achieve inhibition of agglomeration, Effect of inhibiting growth and reducing volume expansion

Active Publication Date: 2021-12-03
HARBIN ENG UNIV
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Problems solved by technology

[0004] The present invention aims to solve the technical problem that the existing iron diselenide negative electrode material will undergo drastic volume changes during the lithium intercalation process, thereby causing rapid capacity attenuation and even battery failure, and provides a graphene used for lithium ion battery negative electrode materials Iron diselenide composite material and preparation method thereof

Method used

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  • Graphene/iron diselenide composite material for lithium ion battery negative electrode material, and preparation method thereof
  • Graphene/iron diselenide composite material for lithium ion battery negative electrode material, and preparation method thereof
  • Graphene/iron diselenide composite material for lithium ion battery negative electrode material, and preparation method thereof

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Embodiment 1

[0035] Embodiment 1: a kind of graphene / iron diselenide composite material that is used for lithium-ion battery negative electrode material in this embodiment is made of wrinkled graphene nanosheets, iron diselenide nanoparticles evenly distributed on the wrinkled graphene nanosheets and The iron diselenide nanoparticles wrapped by wrinkled graphene nanosheets are composed of iron diselenide nanoparticles with a particle diameter of 10-30nm, and the wrinkled graphene nanosheets are cross-linked to form a three-dimensional porous network structure.

[0036] The method for the graphene / iron diselenide composite material that is used for lithium-ion battery negative electrode material described in preparation embodiment 1 is carried out as follows:

[0037] Step 1: Prepare graphite oxide dispersion by modified Hummer's method, wash with distilled water and then redisperse in distilled water to obtain a concentration of 0.1 mg·mL -1 Graphene oxide dispersion liquid; Wherein the co...

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Abstract

The invention discloses a graphene / iron diselenide composite material for a lithium ion battery negative electrode material, and a preparation method thereof, and belongs to the field of lithium ion battery negative electrode materials and preparation thereof. The invention aims to solve the technical problem that the capacity is rapidly attenuated and even the battery is invalid due to the violent volume change of the existing iron diselenide negative electrode material in the lithium intercalation process. The graphene / iron diselenide composite material disclosed by the invention is composed of a wrinkled graphene nanosheet, iron diselenide nanoparticles uniformly distributed on the wrinkled graphene nanosheet, and iron diselenide nanoparticles wrapped by the wrinkled graphene nanosheet. When the prepared composite material is used as a lithium ion battery negative electrode material, the volume expansion of iron diselenide during lithium intercalation can be effectively reduced, the specific capacity and the rate capability of the electrode material are remarkably improved, the defects of a single iron diselenide material are well overcome, and the preparation method is short in technological process, simple and controllable to operate, low in cost and easy in large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials and preparation thereof, and in particular relates to a graphene / iron diselenide composite material used for lithium-ion battery negative electrode materials and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products and electric vehicles due to their advantages of high energy density and small self-discharge, among which the electrode material is one of the main factors affecting the performance of lithium-ion batteries. Among the existing negative electrode material systems, graphite is the most commonly used negative electrode material in commercial lithium-ion batteries, and has good cycle stability. However, the theoretical specific capacity of graphite (372mAh g -1 ) is low; the theoretical specific capacity of transition metal oxides is much higher than that of graphite, but their initi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B19/04C01B32/184B82Y30/00B82Y40/00
CPCH01M4/366H01M4/581H01M4/628H01M4/625H01M10/0525B82Y30/00B82Y40/00C01B32/184C01B19/007H01M2004/027H01M2004/021C01P2004/80C01P2002/72C01P2004/03C01P2006/40C01P2004/64Y02E60/10
Inventor 闫俊胡承成王倩
Owner HARBIN ENG UNIV
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