Lithium iron phosphate/multilayer graphene composite material and its preparation method and lithium ion battery using it

A multi-layer graphene, lithium-ion battery technology, applied in the field of materials, can solve the problems of lithium iron phosphate size uniformity, distribution uniformity, etc. to be improved, and achieves improvement of low electronic conductivity, strong metal ion load capacity, and easy control. Effect

Active Publication Date: 2020-12-29
上海云必科技有限公司
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  • Application Information

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Problems solved by technology

However, the size uniformity and distribution uniformity of lithium iron phosphate synthesized by these methods on the graphene surface need to be improved.

Method used

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  • Lithium iron phosphate/multilayer graphene composite material and its preparation method and lithium ion battery using it
  • Lithium iron phosphate/multilayer graphene composite material and its preparation method and lithium ion battery using it
  • Lithium iron phosphate/multilayer graphene composite material and its preparation method and lithium ion battery using it

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Embodiment Construction

[0035] 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.

[0036] In the prior art, the preparation method of the composite of lithium iron phosphate and graphene is to add iron ions, lithium ions and phosphate ions together in a one-step method, and then chemical co-deposition to synthesize the precursor. The precursor distribution of this method is difficult to evenly distribute on the graphene surface, so the final lithium iron phosphate distribution is not uniform.

[0037] In order to solve the above-mentioned technical problems, the present invention discloses a preparation method of a composite material of lithium iron phosphate / multilayer graphene, comprising the following steps:

[0038] Step S1, prepa...

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Abstract

The invention discloses a lithium iron phosphate / multilayer graphene composite material, a preparation method thereof and a lithium ion battery using the same, comprising the following steps: step S1, preparing iron oxide / multilayer graphene composite material; step S2, oxidizing The iron oxide in the iron / multilayer graphene composite is converted to lithium iron phosphate to form the lithium iron phosphate / multilayer graphene composite. By adopting the technical scheme of the present invention, lithium iron phosphate can be prepared on the surface of flexible multilayer graphene, and the particle size of lithium iron phosphate is relatively small, mainly between 100 and 200 nanometers, thereby solving the problem that lithium iron phosphate cannot be bent and has poor conductivity problem, suitable for flexible Li-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a lithium iron phosphate / multilayer graphene composite material, a preparation method thereof, and a lithium ion battery using the same. Background technique [0002] With the rapid progress of electronic technology, more and more electronic devices are developing in the direction of lightness, flexibility and wearability. Lithium-ion batteries have high energy density, good cycle performance and good stability. They are ideal for the development of flexible storage ideal candidates for high-performance devices. The olivine-structured lithium iron phosphate material is currently the most promising cathode material for lithium-ion batteries due to its advantages such as good thermal stability, long cycle life, environmental friendliness, and abundant raw material sources. Traditional lithium-ion batteries and other products are rigid, and when bent or folded, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 徐军明杨政鸿宋开新
Owner 上海云必科技有限公司
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