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Porous graphene lithium cobalt oxide composite material, and preparation method and application thereof

A technology of porous graphene and composite materials, which is applied in the field of electrochemistry, can solve problems such as difficulty in fully utilizing the physical and chemical properties of graphene, weak bonding between graphene and electrode materials, etc., and achieve excellent rate discharge performance and cycle stability. Low production cost and good uniformity

Pending Publication Date: 2020-12-18
ZTE CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, graphene mostly participates in electrochemical reactions in the form of conductive additives. Simple physical mixing leads to weak bonding between graphene and electrode materials, making it difficult to give full play to the excellent physical and chemical properties of graphene.

Method used

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  • Porous graphene lithium cobalt oxide composite material, and preparation method and application thereof
  • Porous graphene lithium cobalt oxide composite material, and preparation method and application thereof
  • Porous graphene lithium cobalt oxide composite material, and preparation method and application thereof

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preparation example Construction

[0027] The preparation method of the embodiment of the present application can form a porous graphene coating layer through one operation, the process is simple, and there is no need to add various organic solvents, surfactants, reducing agents, oxidants, etc. during the formation of the porous graphene coating layer. Additive, low production cost.

[0028] The preparation method of the embodiment of the present application combines the mixing process of porous graphene and lithium cobaltate with spray drying technology, the process is simple, and it is suitable for mass production of porous graphene lithium cobaltate composite materials.

[0029] In the embodiment of the present application, the mass ratio of porous graphene to water can be 1×10 -5 :1~100×10 -5 :1, for example, it can be 10×10 -5 :1, 20×10 -5 :1, 50×10 -5 :1, 80×10 -5 :1, 90×10 -5 :1 etc. When the mass ratio of porous graphene to water is 1×10 -5 :1~100×10 -5 : When within the range of 1, the conduct...

Embodiment 1

[0051] Preparation of porous graphene lithium cobalt oxide composite material:

[0052] Prepare 200ml of an aqueous solution containing 0.01g of porous graphene; add 2g of lithium cobaltate powder to the aqueous solution of porous graphene, and stir for 20min at a stirring speed of 240 rpm; ℃, and the feed flow rate is 400mL / min for spray drying. Obtain porous graphene lithium cobalt oxide composite material.

[0053] The porous graphene lithium cobalt oxide composite material prepared above is used as the positive electrode active material of lithium ion battery to prepare lithium ion battery:

[0054] Using N-methylpyrrolidone as a solvent, mix the porous graphene lithium cobaltate composite material, conductive agent carbon black and binder polyvinylidene fluoride at a mass ratio of 80:10:10, stir evenly to form a slurry coating On the surface of the aluminum foil, vacuum-dry for 12 hours, and press to make a positive electrode sheet with a diameter of 10 mm.

[0055] Me...

Embodiment 2

[0058] Preparation of porous graphene lithium cobalt oxide composite material:

[0059] Prepare 200ml of an aqueous solution containing 0.1g of porous graphene; add 100g of lithium cobaltate powder to the aqueous solution of porous graphene, and stir for 120min at a stirring speed of 360 rpm; ℃, and the feed flow rate is 800mL / min for spray drying. Obtain porous graphene lithium cobalt oxide composite material.

[0060] The porous graphene lithium cobalt oxide composite material prepared above is used as the positive electrode active material of lithium ion battery to prepare lithium ion battery:

[0061] Using N-methylpyrrolidone as a solvent, mix the porous graphene lithium cobaltate composite material, conductive agent carbon black and binder polyvinylidene fluoride at a mass ratio of 80:10:10, stir evenly to form a slurry coating on the surface of aluminum foil, then vacuum-dried for 12 hours, and pressed into a positive electrode sheet with a diameter of 10 mm.

[0062...

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Abstract

The invention discloses a porous graphene lithium cobalt oxide composite material, and a preparation method and an application thereof. The preparation method comprises the following steps: preparingan aqueous solution of porous graphene; adding lithium cobalt oxide into the aqueous solution of the porous graphene; and after uniformly mixing, carrying out spray drying to obtain the composite material. The composite material has a continuous three-dimensional conductive structure, the surface of lithium cobalt oxide is coated with porous graphene, and bridging connection is formed between thelithium cobalt oxide. According to the preparation method, a mixing process of porous graphene and lithium cobalt oxide is combined with an efficient spray drying technology, a process is simple, thepreparation method is suitable for mass production, various additives do not need to be added, and production cost is low; and a complete, continuous and good-conductivity porous graphene coating layer can be formed on the surface of the lithium cobalt oxide so that rate discharge performance and cycling stability of the lithium ion battery are improved.

Description

technical field [0001] The present application relates to but not limited to the field of electrochemistry, specifically, but not limited to a porous graphene lithium cobalt oxide composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, convenient use, and long cycle life, and are widely used in portable electronic devices, power tools, hybrid / full electric vehicles, and other fields. Lithium-ion battery cathode materials include lithium iron phosphate, ternary materials, lithium cobaltate, lithium manganate, lithium titanate, etc. The positive electrode material occupies a large proportion in the composition of lithium batteries, and its performance directly affects the performance of lithium batteries. [0003] Lithium cobalt oxide with a layered structure is a commonly used cathode material for lithium-ion batteries. It has the advantages of high tap density, high workin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/625H01M10/0525H01M4/36H01M4/62Y02E60/10
Inventor 沈文卓晁丹丹吴宏超丘海东孙卫山
Owner ZTE CORP