CN105070911A - Lithium iron phosphate battery positive electrode material - Google Patents
Lithium iron phosphate battery positive electrode material Download PDFInfo
- Publication number
- CN105070911A CN105070911A CN201510382325.5A CN201510382325A CN105070911A CN 105070911 A CN105070911 A CN 105070911A CN 201510382325 A CN201510382325 A CN 201510382325A CN 105070911 A CN105070911 A CN 105070911A
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- graphene
- lifepo4
- iron phosphate
- lithium iron
- positive electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5805—Phosphides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention provides a lithium iron phosphate battery positive electrode material. The lithium iron phosphate battery positive electrode material comprises a lithium iron phosphate/graphene composite material, and the surface of the lithium iron phosphate/graphene composite material is coated with graphene nanosheets. Graphene is uniformly dispersed in the lithium iron phosphate/graphene composite material, graphene coated on the surface of the composite material can improve the conductivity of the positive electrode material, the power density, the charge and discharge speed and the electric capacity of the above battery are improved, and the use amount of a conductive material is reduced; and the positive electrode material has the advantages of good conductivity and high tap density, can be used to make high-capacity batteries, and can meet large scale production needs.
Description
Technical field
The present invention relates to a kind of dynamic lithium battery material, be specifically related to a kind of lithium iron phosphate battery positive material.
Background technology
The performance of lithium ion battery depends primarily on positive and negative pole material, LiFePO4 is a kind of novel anode material for lithium-ion batteries, its security performance and cycle life are that other battery material is incomparable, meet the needs of the frequent discharge and recharge of electric motor car, and be that the high capacity lithium ion battery of positive electrode is more easily connected use with LiFePO4, higher power can be provided for electric motor car.In addition, LiFePO4 has the advantages such as nontoxic, pollution-free, security performance is good, raw material sources is extensive, low price, and the life-span is long, is the desirable positive electrode of power lithium-ion battery of new generation.
LiFePO4 bulk density is low hinders its practical application with shortcoming that is poorly conductive.In order to improve conductivity, disclosing and mixing the material with carbon elements such as electrically conductive graphite in the material in prior art, but it reduce the bulk density of material, the tap density of carbon dope LiFePO4 generally only has 1.0 ~ 1.2g/cm
3, and the tap density of commodity cobalt acid lithium is generally 2.0 ~ 2.4g/cm
3, so low bulk density makes the volume and capacity ratio of LiFePO4 mutually far short of what is expected with cobalt acid lithium, and the battery volume made is comparatively large, is difficult to be applied to reality; In addition, the electrically conductive graphite of doping is generally spherical, forms point cantact with LiFePO4, and in order to form good path, doping is comparatively large, thus causes the volume of lithium iron phosphate positive material larger.
Desirable Graphene is a kind of material with carbon element of monoatomic layer, and the industrial material mostly being 1 ~ 10 atomic layer that can be mass-produced, is referred to as graphene nanometer sheet usually.Using graphene nanometer sheet as the electric conducting material in cathode material of lithium iron phosphate lithium battery, its tap density can be improved while guarantee lithium iron phosphate positive material electric conductivity, lithium battery power density, charge/discharge rates and capacitance can be improved, for its practical application lays the foundation.
Summary of the invention
The object of this invention is to provide a kind of lithium iron phosphate battery positive material, solve the problem of the low and poorly conductive of lithium iron phosphate positive material tap density, for the further raising of lithium battery performance lays the foundation.
For achieving the above object, the present invention adopts following technical scheme:
A kind of lithium iron phosphate battery positive material, this material comprises LiFePO4/graphene composite material, and described LiFePO4/graphene composite material Surface coating has graphene nanometer sheet.
First preferred version of described lithium iron phosphate battery positive material, in described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 100: 1 ~ 1: 1.
Second preferred version of described lithium iron phosphate battery positive material, in described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 50: 1 ~ 5: 1.
3rd preferred version of described lithium iron phosphate battery positive material, in described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 20: 1.
4th preferred version of described lithium iron phosphate battery positive material, in described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 100: 1 ~ 1: 1.
5th preferred version of described lithium iron phosphate battery positive material, in described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 50: 1 ~ 5: 1.
6th preferred version of described lithium iron phosphate battery positive material, in described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 20: 1.
With immediate prior art ratio, tool of the present invention has the following advantages:
1) in LiFePO4/graphene composite material of the present invention, Graphene is evenly distributed and can improves the conductivity of positive electrode with the Graphene being coated on composite material surface, improve the power density of battery, charge/discharge rates, capacitance and cycle performance, reduce the consumption of electric conducting material, reduce the volume of positive electrode, specific discharge capacity is up to 169.5mAhg
-1, after 1000 circulations of 10C multiplying power, specific capacity conservation rate is greater than 92%;
2) LiFePO4 of the present invention/graphene composite material adopts prilling, improves its tap density, reduce the volume of conductive carbon material while guarantee positive electrode conductivity.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is described further, but protection scope of the present invention is not limited to the content of following examples.
Embodiment 1
A kind of lithium iron phosphate battery positive material, this material comprises LiFePO4/graphene composite material, and described LiFePO4/graphene composite material Surface coating has graphene nanometer sheet.
In described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 20: 1; In described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 20: 1.
Embodiment 2
A kind of lithium iron phosphate battery positive material, this material comprises LiFePO4/graphene composite material, and described LiFePO4/graphene composite material Surface coating has graphene nanometer sheet.
In described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 40: 1; In described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 5: 1.
Embodiment 3
A kind of lithium iron phosphate battery positive material, this material comprises LiFePO4/graphene composite material, and described LiFePO4/graphene composite material Surface coating has graphene nanometer sheet.
In described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 35: 1; In described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 10: 1.
Embodiment 4
A kind of lithium iron phosphate battery positive material, this material comprises LiFePO4/graphene composite material, and described LiFePO4/graphene composite material Surface coating has graphene nanometer sheet.
In described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 30: 1; In described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 10: 1.
Embodiment 5
A kind of lithium iron phosphate battery positive material, this material comprises LiFePO4/graphene composite material, and described LiFePO4/graphene composite material Surface coating has graphene nanometer sheet.
In described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 15: 1; In described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 20: 1.
Embodiment 6
A kind of lithium iron phosphate battery positive material, this material comprises LiFePO4/graphene composite material, and described LiFePO4/graphene composite material Surface coating has graphene nanometer sheet.
In described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 10: 1; In described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 20: 1.
Comparative example 1
A kind of lithium iron phosphate battery positive material, this material comprises LiFePO4/graphene composite material, and in described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 20: 1.
Comparative example 2
A kind of lithium iron phosphate battery positive material, this material comprises LiFePO4 and the graphene nanometer sheet being coated on its surface, and the mass ratio of described LiFePO4 and graphene nanometer sheet is 20: 1.
Gained positive electrode is assembled into 2025 button cells, and at its discharge capacity of 2.5 ~ 4.2V voltage range build-in test and cycle performance, result is as shown in table 1, and in embodiment, the specific discharge capacity of products obtained therefrom is up to 169.5mAhg
-1after 1000 circulations of 10C multiplying power, specific capacity conservation rate is greater than 92%, in LiFePO4/graphene composite material Graphene and the graphene nanometer sheet acting in conjunction being coated on composite material surface comparatively individualism time, the performance of material increases (comparative example 1 and comparative example).
Table 1
Above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; those of ordinary skill in the field are to be understood that; can modify to the specific embodiment of the present invention with reference to above-described embodiment or equivalent to replace, these do not depart from any amendment of spirit and scope of the invention or equivalently to replace within the claims that all awaits the reply in application.
Claims (7)
1. a lithium iron phosphate battery positive material, is characterized in that, this material comprises LiFePO4/graphene composite material, and described LiFePO4/graphene composite material Surface coating has graphene nanometer sheet.
2. lithium iron phosphate battery positive material according to claim 1, is characterized in that, in described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 100: 1 ~ 1: 1.
3. lithium iron phosphate battery positive material according to claim 1, is characterized in that, in described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 50: 1 ~ 5: 1.
4. lithium iron phosphate battery positive material according to claim 2, is characterized in that, in described LiFePO4/graphene composite material, the mass ratio of LiFePO4 and Graphene is 20: 1.
5. lithium iron phosphate battery positive material according to claim 1, is characterized in that, in described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 100: 1 ~ 1: 1.
6. lithium iron phosphate battery positive material according to claim 1, is characterized in that, in described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 50: 1 ~ 5: 1.
7. lithium iron phosphate battery positive material according to claim 4, is characterized in that, in described positive electrode, the mass ratio of LiFePO4 and graphene nanometer sheet is 20: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510382325.5A CN105070911A (en) | 2015-06-25 | 2015-06-25 | Lithium iron phosphate battery positive electrode material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510382325.5A CN105070911A (en) | 2015-06-25 | 2015-06-25 | Lithium iron phosphate battery positive electrode material |
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| CN105070911A true CN105070911A (en) | 2015-11-18 |
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| CN201510382325.5A Pending CN105070911A (en) | 2015-06-25 | 2015-06-25 | Lithium iron phosphate battery positive electrode material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552360A (en) * | 2016-03-03 | 2016-05-04 | 四川浩普瑞新能源材料股份有限公司 | Modified lithium nickel cobalt manganese oxide cathode material and preparation method thereof |
| CN107068990A (en) * | 2016-12-26 | 2017-08-18 | 苏州高通新材料科技有限公司 | Graphene composite lithium iron phosphate cathode material and preparation method and application |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306783A (en) * | 2011-09-14 | 2012-01-04 | 哈尔滨工业大学 | Multi-layer graphene/lithium iron phosphate intercalated composite material, preparation method thereof, and lithium ion battery adopting multi-layer grapheme/lithium iron phosphate intercalated composite material as anode material |
| CN102544492A (en) * | 2011-03-07 | 2012-07-04 | 南京大学 | Lithium iron phosphate/graphene composite material with interlay sheet structure and preparation method and application thereof |
| CN103872287A (en) * | 2014-03-20 | 2014-06-18 | 重庆工商大学 | Composite positive electrode material of graphene and lithium iron phosphate battery and preparation method thereof |
-
2015
- 2015-06-25 CN CN201510382325.5A patent/CN105070911A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544492A (en) * | 2011-03-07 | 2012-07-04 | 南京大学 | Lithium iron phosphate/graphene composite material with interlay sheet structure and preparation method and application thereof |
| CN102306783A (en) * | 2011-09-14 | 2012-01-04 | 哈尔滨工业大学 | Multi-layer graphene/lithium iron phosphate intercalated composite material, preparation method thereof, and lithium ion battery adopting multi-layer grapheme/lithium iron phosphate intercalated composite material as anode material |
| CN103872287A (en) * | 2014-03-20 | 2014-06-18 | 重庆工商大学 | Composite positive electrode material of graphene and lithium iron phosphate battery and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| XINGLING LEI，ET AL.: "A three-dimensional LiFePO4/carbon nanotubes/graphene composite as a cathode material for lithium-ion batteries with superior high-rate performance", 《JOURNAL OF ALLOYS AND COMPOUNDS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552360A (en) * | 2016-03-03 | 2016-05-04 | 四川浩普瑞新能源材料股份有限公司 | Modified lithium nickel cobalt manganese oxide cathode material and preparation method thereof |
| CN107068990A (en) * | 2016-12-26 | 2017-08-18 | 苏州高通新材料科技有限公司 | Graphene composite lithium iron phosphate cathode material and preparation method and application |
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Address after: 100095 Haidian District hot springs town, Beijing Village Applicant after: China Hangfa Beijing Institute of Aerial Materials Address before: 100095 Haidian District hot springs town, Beijing Village Applicant before: Beijing Institute of Aeronautical Materials, China Aviation Industry Group Corporation |
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Application publication date: 20151118 |
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