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Graphene negative electrode material and preparation method and application thereof

A graphene negative electrode and graphene technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low theoretical capacity and limited electrochemical performance of lithium-ion batteries, and achieve simple preparation process and good storage capacity , Ease of use

Pending Publication Date: 2022-03-15
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the negative electrode, graphite can provide a low and stable working voltage, and has a long cycle life and high Coulombic efficiency, but its theoretical capacity is low, only 372mA hg -1 , which greatly limits the improvement of the electrochemical performance of lithium-ion batteries (Journal of Energy Chemistry 2020; 49; 233-242)

Method used

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  • Graphene negative electrode material and preparation method and application thereof
  • Graphene negative electrode material and preparation method and application thereof
  • Graphene negative electrode material and preparation method and application thereof

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preparation example Construction

[0037] The preparation method of the graphene negative electrode material of the present invention comprises: using a jet mill to pulverize the graphene raw material to obtain the graphene negative electrode material. According to research of the present invention, by this preparation method, graphene raw material can be pulverized, obtains the graphene of smaller particle size (being graphene negative electrode material), also can have certain exfoliation simultaneously, reduces the obtained small particle size graphite The layer number and thickness of graphene, more importantly, can ensure the surface flatness of the obtained graphene, so that it has a suitable defect density, and at the same time ensure the integrity of the sheet structure of the graphene negative electrode material. Research shows that the obtained The surface of the prepared graphene negative electrode material is smooth, and there are basically no interlayer fractures, wrinkles and the like. In addition...

Embodiment 1

[0055] 1. Preparation of graphene raw material with supercritical fluid: Add natural graphite into the reaction kettle, pass carbon dioxide into it, and raise the temperature to about 50°C, control the pressure so that the carbon dioxide passed into the reaction kettle is in a supercritical state, so that the graphite raw material is in a supercritical state. The intercalation reaction is carried out in a supercritical state. After about 120 minutes of reaction, the reaction ends, and the reactor is depressurized to peel off the reacted graphite raw material to obtain the graphene raw material.

[0056] 2. Preparation of graphene negative electrode material

[0057] (1) 30g graphene raw material is divided into 5-6 times and added in jet pulverizer, to carry out stirring pulverization process under 500-3000r / min rotating speed, processing time is 24-30h, obtain pulverization product;

[0058] (2) Sieve the pulverized product, the mesh number of the sieve used is 2000-6000 mesh...

Embodiment 2

[0071] The difference between embodiment 2 and embodiment 1 is that in the step (3) of preparing graphene negative electrode material, repeat step (1) and step (2) altogether 12 times (that is, pulverize altogether 13 times), all the other conditions are the same as in embodiment 1 same.

[0072] After testing, the Raman spectrum I of this graphene negative electrode material D / I G = 0.6, the average particle size is about 800nm; XRD analysis results show: have the diffraction angle of ultrafine graphene, that is, the diffraction angle 2θ=25.4 ° of (002) interlayer spacing (its XRD pattern is shown in Figure 11 shown); the specific surface area is 2.7m 2 / g, the number of layers is 3 layers, and the carbon content is greater than 99.99%.

[0073] The rate performance curve of the lithium-ion battery measured in embodiment 2 is shown in Figure 4 (See Figure 4 The curve corresponding to the graphene negative electrode material in the middle), which is at 200mA g -1 The...

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Abstract

The invention provides a graphene negative electrode material and a preparation method and application thereof, the Raman spectrum ID / IG of the graphene negative electrode material is greater than or equal to 0.1 and less than or equal to 2, and the average particle size of the graphene negative electrode material is 500-2500nm. The graphene material provided by the invention can be directly used as a negative electrode active material, and can significantly improve the cyclicity and other performances of a negative electrode and a battery.

Description

technical field [0001] The invention relates to a graphene negative electrode material and a preparation method and application thereof, belonging to the field of carbon materials and applications thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and strong adaptability to the external environment, and are widely used in portable electronic devices, new energy vehicles and other fields. Lithium-ion batteries are mainly composed of three parts: positive electrode, negative electrode and electrolyte. Among them, the commonly used positive electrode materials are mainly lithium transition metal oxides, such as lithium iron phosphate (LiFePO 4 ), lithium cobalt oxide (LiCoO 2 ), ternary materials, etc., the commonly used anode materials are mainly graphite, such as natural graphite. For the negative electrode, graphite can provide a low and stable working voltage, and has a long cycle life and high Coulomb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M4/1393H01M10/0525
CPCH01M4/583H01M4/133H01M4/1393H01M10/0525Y02E60/10
Inventor 李永峰马新龙张细璐
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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