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Lithium ion battery adopting graphene as cathode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing manufacturing costs and achieve the effects of easy operation, low cost, and high specific capacity

Inactive Publication Date: 2009-11-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on carbon negative electrode mainly uses various methods to modify graphite materials and amorphous carbon electrode materials. Surface treatment of artificial graphite will further increase the manufacturing cost. The focus of future research is how to make better use of cheap natural stone. Ink and its effective modification and development of valuable amorphous carbon materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The low-temperature preparation method of graphene powder material refers to the published invention patent (Yang Quanhong et al., high electrochemical capacity graphene oxide and its low-temperature preparation method and application, Chinese patent, application number: 200810151807.X, publication number: CN101367516).

[0017] Take 25.0g of graphene material prepared by low-temperature method, add 2.5g of PVDF as a binder, add N-methyl-2-pyrrolidone dropwise to mix the above mixture evenly into a slurry, and bake it to semi-dry according to the battery plate production process , press it on the copper foil current collector, and then dry the negative electrode plate under vacuum at 100-150° C. to obtain the negative electrode of the lithium ion battery. Take the positive electrode active material lithium cobaltate, PVDF and conductive carbon black respectively 100.0g, 11.8g and 5.9g and mix them, add N-methyl-2-pyrrolidone dropwise to mix the above mixture evenly into ...

Embodiment 2

[0019] Take 25.0g of graphene material prepared by low-temperature method, add 2.5g of PVDF as a binder, add N-methyl-2-pyrrolidone dropwise to mix the above mixture evenly into a slurry, and when it is half-dried, follow the battery manufacturing process, It is pressed on the copper foil current collector, and then the negative electrode plate is dried under vacuum at 100-150° C. to obtain the lithium ion battery negative electrode plate. Take the positive electrode active material lithium iron phosphate, PVDF and conductive carbon black respectively 125.0g, 14.8g and 7.4g and mix them, add N-methyl-2-pyrrolidone dropwise to mix the above mixture evenly into a slurry, and press the The battery manufacturing process is to uniformly press it on the aluminum foil current collector, and then dry the positive electrode plate under vacuum at 100-150°C to obtain the positive electrode of the lithium ion battery. In a vacuum glove box, the positive electrode, negative electrode, sepa...

Embodiment 3

[0021] Take 25.0g of graphene material prepared by low-temperature method, add 2.5g of styrene-butadiene rubber as a binder, add absolute ethanol dropwise to mix the above mixture evenly into a slurry, and press it according to the battery manufacturing process when it is half dry. Copper foil current collector, and then dry the negative electrode plate under vacuum at 100-150°C to obtain the negative electrode of the lithium ion battery. Take the positive electrode active material spinel lithium manganese oxide, styrene-butadiene rubber and conductive carbon black at 150.0g, 17.6g and 8.8g respectively, add absolute ethanol dropwise to mix the above mixture evenly into a slurry, and press the The battery manufacturing process is to uniformly press it on the aluminum foil current collector, and then dry the positive electrode plate under vacuum at 100-150°C to obtain the positive electrode of the lithium ion battery. In a vacuum glove box, the positive electrode, negative elec...

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Abstract

The invention provides a lithium ion battery adopting graphene as a cathode material. The lithium ion battery which is prepared by the low-temperature method and adopts the graphene material as the cathode material includes a metal casing, a plate electrode, electrolytic solution and a septum, wherein active substances used by the anode plate electrode are commonly used anode materials for the lithium ion battery and include lithium cobaltate, lithium iron phosphate, lithium manganate, lithium nickelate, a ternary lithium-nickelate-cobaltate-manganate material and the like; and the electrolytic solution is lithium hexaflourophosphate electrolytic solution used by the lithium ion battery. The cathode of the lithium ion battery adopting the graphene material as the cathode material is made of the graphene material. The first discharge capacity of the lithium ion battery adopting the graphene material as the cathode material can reach 400 to 800mAh / g, and the first charge discharge efficiency can reach 40 to 90 percent; and after 20 cycles, the discharge capacity of the lithium ion battery can still reach 380 to 450mAh / g. The lithium ion battery has the advantages of simple preparation process of the graphene material, easy operation and low cost; and the lithium ion battery adopting the graphene as the cathode material has high discharge capacity and favorable cycle performance.

Description

technical field [0001] The invention relates to a lithium ion battery with graphene as a negative electrode material, which belongs to a new power supply technology. Background technique [0002] Since 1994, the research on lithium-ion battery anode materials has mainly focused on carbon materials, alloy materials and composite materials. Carbon materials are the earliest anode materials for lithium-ion batteries that were researched and commercialized by people, and they are still one of the focuses of everyone's attention and research. Natural graphite and artificial graphite are the most widely used carbon-based anode materials. Artificial graphite prepared by doping, structural adjustment or surface modification of graphitizable carbon such as petroleum coke and high-temperature graphitization treatment has a specific capacity of about 330-350mAh / g, and has good cycle performance and Lower price. Amorphous carbon is a carbon material with an amorphous structure, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/38H01M4/02H01M4/04
CPCY02E60/12Y02E60/10
Inventor 杨全红吕伟贺艳兵孙辉
Owner TIANJIN UNIV
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