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Lithium iron phosphate/multilayer graphene composite material, preparation method thereof and lithium ion battery using same

A multi-layer graphene and lithium-ion battery technology, which is applied in the field of materials, can solve the problems such as the size uniformity and distribution uniformity of lithium iron phosphate to be improved, and achieve the improvement of low electronic conductivity, strong metal ion loading capacity, and overall process simple effect

Active Publication Date: 2019-01-15
上海云必科技有限公司
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  • Abstract
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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, preparation method thereof and lithium ion battery using same
  • Lithium iron phosphate/multilayer graphene composite material, preparation method thereof and lithium ion battery using same
  • Lithium iron phosphate/multilayer graphene composite material, preparation method thereof and lithium ion battery using same

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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 an iron oxide / multilayer graphene composite material; Step S2, converting the iron oxide in the iron oxide / multilayer graphene composite material into lithium iron phosphate to form the lithium iron phosphate / multilayer graphene composite material. By adopting the technical proposal of the invention, lithium iron phosphate can be prepared on the surface of the flexible multilayer graphene, and the particle size of the lithium iron phosphate is small, mainly between 100 and 200 nanometers, so as to solve the problems that the lithium iron phosphate cannot be bent and the conductivityis poor, and the lithium iron phosphate is suitable for flexible lithium 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 Applications(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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