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Lithium iron phosphate/graphene composite lithium battery positive electrode material with porous structure

A graphene composite and lithium iron phosphate technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of poor rate performance and insignificant improvement in electrochemical performance, and achieve excellent electrical conductivity and a wide range of raw material options Broad, effect-enhancing magnification performance

Inactive Publication Date: 2018-03-27
深圳市毓丰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the method of doping or coating graphene and lithium iron phosphate to improve the electrochemical performance of lithium iron phosphate has the problem of poor rate performance and insignificant improvement of electrochemical performance.

Method used

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  • Lithium iron phosphate/graphene composite lithium battery positive electrode material with porous structure
  • Lithium iron phosphate/graphene composite lithium battery positive electrode material with porous structure
  • Lithium iron phosphate/graphene composite lithium battery positive electrode material with porous structure

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Embodiment 1

[0026] This embodiment provides a lithium iron phosphate / graphene composite lithium battery positive electrode material with a porous structure, the positive electrode material has a core-shell structure, wherein the material of the core structure is lithium iron phosphate, the material of the shell structure is graphene, and A pore structure is formed on the graphene, the pore size of the pore structure is 5nm-100nm, and the specific surface area of ​​the positive electrode material is 180㎡ / g.

[0027] Wherein, the particle size of lithium iron phosphate is 1 μm-5 μm, and the thickness of graphene is 10 nm-100 nm.

[0028] The preparation method of the cathode material at least includes the following steps:

[0029] In the first step, mix deionized water with lithium carbonate, iron phosphate, and sucrose and stir thoroughly to obtain mixture A; wherein, the molar ratio of lithium in lithium carbonate and iron in iron phosphate is 1:1, and in mixture A, The concentration of ...

Embodiment 2

[0037] This embodiment provides a lithium iron phosphate / graphene composite lithium battery positive electrode material with a porous structure, the positive electrode material has a core-shell structure, wherein the material of the core structure is lithium iron phosphate, the material of the shell structure is graphene, and A pore structure is formed on the graphene, the pore size of the pore structure is 5nm-100nm, and the specific surface area of ​​the positive electrode material is 130㎡ / g.

[0038] Wherein, the particle size of lithium iron phosphate is 1 μm-5 μm, and the thickness of graphene is 10 nm-100 nm.

[0039] The preparation method of the cathode material at least includes the following steps:

[0040] In the first step, mix deionized water with lithium acetate, iron phosphate, and sucrose and stir thoroughly to obtain mixture A; wherein, the molar ratio of lithium in lithium acetate to iron in iron phosphate is 1.01:1, and in mixture A, The concentration of li...

Embodiment 3

[0046] This embodiment provides a lithium iron phosphate / graphene composite lithium battery positive electrode material with a porous structure, the positive electrode material has a core-shell structure, wherein the material of the core structure is lithium iron phosphate, the material of the shell structure is graphene, and A pore structure is formed on the graphene, the pore size of the pore structure is 5nm-100nm, and the specific surface area of ​​the positive electrode material is 100m2 / g.

[0047] Wherein, the particle size of lithium iron phosphate is 1 μm-5 μm, and the thickness of graphene is 10 nm-100 nm.

[0048] The preparation method of the cathode material at least includes the following steps:

[0049] In the first step, mix deionized water with lithium citrate, iron phosphate, and sucrose and stir thoroughly to obtain mixture A; wherein, the molar ratio of lithium in lithium citrate and iron in iron phosphate is 0.99:1, and in mixture A Among them, the concen...

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Abstract

The invention belongs to the technical field of a lithium battery, and particularly relates to a lithium iron phosphate / graphene composite lithium battery positive electrode material with a porous structure. The positive electrode material has a core-shell structure, wherein the core structure is made of lithium iron phosphate; the shell structure is made of graphene; in addition, hole structuresare formed in the graphene; the hole diameter of the hole structures is 5nm to 100nm; the specific surface area of the positive electrode material is 30 to 300 m<2> / g. Compared with the prior art, thepositive electrode material provided by the invention has the core shell structure, wherein the core structure is made of lithium iron phosphate; the shell structure is made of graphene; in addition,the hole structures are formed in the graphene; through the addition of the graphene, the conductivity of the lithium iron phosphate materials is improved; in the preparation process, ferric ions arereduced into ferrous; partial carbons in graphene sheet layers are used as reducing agents to be consumed, so that holes through which lithium ions can pass are formed in the surface; the rate capability and fast charging and discharging capability of the lithium iron phosphate material are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a lithium iron phosphate / graphene composite lithium battery cathode material with a porous structure. Background technique [0002] As the world pays more and more attention to the development of new energy vehicles, power batteries, one of the core components of new energy vehicles, have become the focus of research. Whether it is a hybrid or a pure electric vehicle, the lithium-ion battery has become the battery with the best comprehensive performance due to its high energy density, long service life, safety, pollution-free and small self-discharge coefficient. [0003] The positive electrode material is one of the key factors restricting the performance of lithium batteries. Lithium iron phosphate is rich in resources, low in price, good in safety and friendly to the environment. It is currently the mainstream positive electrode material for lithium-ion power batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 许东伟
Owner 深圳市毓丰新材料有限公司
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