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Lithium iron phosphate film/multilayer graphene composite material with sandwich structure and preparation method of lithium iron phosphate film/multilayer graphene composite material

A multi-layer graphene and lithium iron phosphate technology, applied in the field of materials, can solve problems such as uneven mixing, and achieve the effects of low cost, improved bonding strength, and simple preparation process

Pending Publication Date: 2022-05-17
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, due to the simple mixing method used in this invention patent, iron oxide / multilayer graphene and LiH 2 PO 4 The mixing is not very uniform, resulting in the conversion of iron oxide to LiFePO 4 LiFePO of 100nm to 200nm is formed in the process 4 particles

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[0033] In order to better illustrate the process and solutions of the present invention, the following inventions will be further described in conjunction with the accompanying drawings and embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] The preparation method of the existing lithium iron phosphate / multilayer graphene composite material is to directly stir the multilayer graphene and lithium dihydrogen phosphate in water until the moisture is completely volatilized. This method results in uneven particle size and distribution of precipitated lithium dihydrogen phosphate. As a result, the lithium iron phosphate finally obtained on the surface of the multilayer graphene is granular, and the particle size is 100-200 nm. The contact area between lithium iron phosphate and multilayer graphene is small, so that lithium iron phosphate is easy to fall off from the surface of multilayer g...

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Abstract

The invention discloses a lithium iron phosphate film / multilayer graphene composite material with a sandwich structure and a preparation method thereof, lithium dihydrogen phosphate is dissolved in an aqueous solution, ferric oxide / multilayer graphene is added and stirred, and a uniform mixed solution is formed; according to the method, absolute ethyl alcohol is adopted as a precipitation agent and an anti-agglomeration agent, and lithium dihydrogen phosphate is uniformly deposited in nanopores and on the surface of iron oxide / multilayer graphene by adopting a method of repeatedly adding absolute ethyl alcohol and evaporating a solvent. Finally, uniform lithium dihydrogen phosphate / iron oxide films are formed on the surfaces of the two sides of the multi-layer graphene. And after high-temperature treatment, a uniform lithium iron phosphate film is formed on the surface of the multi-layer graphene. The material has an application prospect in the field of flexible lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a sandwich structure lithium iron phosphate film / multilayer graphene composite material and a preparation method thereof. This material has application prospects in the field of flexible lithium-ion batteries. Background technique [0002] Lithium iron phosphate battery is one of the main lithium-ion batteries at present, and has been widely used in power batteries, electronic products, power tools, etc. With the development of flexible devices and flexible products, the market hopes to develop a flexible battery. However, lithium iron phosphate is a kind of ceramic and has no deformation ability in the bulk state. The researchers took advantage of the flexibility of graphene to form a composite material of lithium iron phosphate and graphene, so that the lithium iron phosphate battery has certain flexible characteristics. However, at present, this composite main...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525C01B25/45C01B32/19
CPCH01M4/5825H01M4/625H01M10/0525C01B32/19C01B25/45C01B2204/04C01B2204/22C01P2006/80C01P2002/72C01P2004/03C01P2004/64
Inventor 徐军明许东东胡晓萍谷成石洋武非凡武军
Owner HANGZHOU DIANZI UNIV
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