CN105047919A - Preparation method for cathode material of lithium iron phosphate battery - Google Patents

Preparation method for cathode material of lithium iron phosphate battery Download PDF

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CN105047919A
CN105047919A CN201510382324.0A CN201510382324A CN105047919A CN 105047919 A CN105047919 A CN 105047919A CN 201510382324 A CN201510382324 A CN 201510382324A CN 105047919 A CN105047919 A CN 105047919A
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lithium
graphene
preparation
lifepo4
composite material
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CN105047919B (en
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燕绍九
洪起虎
杨程
赵双赞
戴圣龙
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BEIJING INSTITUTE OF AERONAUTICAL MATERIALS CHINA AVIATION INDUSTRY GROUP Corp
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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
    • H01M4/362—Composites
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • 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
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • 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
    • 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 Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
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  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention provides a preparation method for a cathode material of a lithium ion phosphate battery. The method comprises the following steps of: 1) preparing a lithium ion phosphate/graphene composite material through in-situ reaction by a hydrothermal method; 2) carrying out granulation of the lithium ion phosphate/graphene composite material to obtain microparticles of 1-10 micrometers; and 3) coating the composite with graphene nano sheets by using a powder mixing machine, and mixing the composite electrode material with an adhesive to obtain the cathode material of the lithium ion battery. In the lithium ion phosphate/graphene composite material prepared according to the invention, graphene is uniformly dispersed, improvement on the conductivity of lithium ion phosphate is promoted, the prepared cathode material is high in conductivity and high in tap density, and a high-capacity battery can be prepared. The preparation process is simple and is high in controllability, and the demand for mass production can be met.

Description

A kind of preparation method of lithium iron phosphate battery positive material
Technical field
The present invention relates to a kind of dynamic lithium battery material, be specifically related to a kind of preparation method 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.Researchers, in order to improve conductivity, mix the material with carbon elements such as electrically conductive graphite in the material, and this significantly reduces again the bulk density of material, and 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, industrial can be mass-produced mostly be 1 ~ 10 atomic layer, be usually referred to as graphene nanometer sheet.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 preparation method 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 preparation method for lithium iron phosphate battery positive material, the method comprises the steps:
1) LiFePO4/graphene composite material is prepared:
A. lithium solution is prepared: soluble lithium compounds is dissolved in deionized water and makes solution;
B. graphene dispersing solution is prepared: be scattered in deionized water through ultrasonic disperse by graphene uniform;
C. hydro-thermal reaction: add in magnetic agitation reactor by step a and b gained solution, add ferrous sulfate and phosphoric acid by atomic ratio Li: Fe: P=1 ~ 3.5: 1: 1, filters after stirring, washing and dry LiFePO4/graphene composite material;
2) composite material granulation: add binding agent in described LiFePO4/graphene composite material, granulation obtains the particulate of 1 ~ 10 μm;
3) anode material of lithium battery is prepared:
D. blend step 2 in mixed powder machine) gained composite material microparticles and graphene nanometer sheet;
E. LiFePO4/graphene composite material steps d gained being coated with graphene nanometer sheet mixes with binding agent, homogenate and drying, then high-temperature vacuum process at 180 ~ 220 DEG C.
First optimal technical scheme of the preparation method of described lithium iron phosphate battery positive material, described soluble lithium compounds is for being lithium acetate, lithium lactate, lithium nitrate, lithium carbonate, lithium citrate, lithium chloride or lithium oxalate.
Second optimal technical scheme of the preparation method of described lithium iron phosphate battery positive material, described hydro-thermal reaction reacts at least 3h at 100 ~ 200 DEG C.
3rd optimal technical scheme of the preparation method of described lithium iron phosphate battery positive material, in solution described in step c, the mass ratio of LiFePO4 and Graphene is 100: 1 ~ 1: 1.
4th optimal technical scheme of the preparation method of described lithium iron phosphate battery positive material, in solution described in step c, the mass ratio of LiFePO4 and Graphene is 20: 1.
5th optimal technical scheme of the preparation method of described lithium iron phosphate battery positive material, described binding agent is sodium alginate, shitosan, sodium cellulose glycolate or polyacrylic acid.
6th optimal technical scheme of the preparation method of described lithium iron phosphate battery positive material, step 2) mass ratio 1: 1 ~ 1: 50 of LiFePO4 in described binding agent and composite material;
7th optimal technical scheme of the preparation method of described lithium iron phosphate battery positive material, in composite material microparticles described in steps d, the mass ratio of LiFePO4 and graphene nanometer sheet is 100: 1 ~ 1: 1.
8th optimal technical scheme of the preparation method of described lithium iron phosphate battery positive material, in composite material microparticles described in steps d, the mass ratio of LiFePO4 and graphene nanometer sheet is 20: 1.
9th optimal technical scheme of the preparation method of described lithium iron phosphate battery positive material, the mass ratio 1: 1 ~ 1: 50 of LiFePO4 in binding agent described in step e and composite material.
With immediate prior art ratio, tool of the present invention has the following advantages:
1) in LiFePO4/graphene composite material of preparing 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 and capacitance, 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) the inventive method adopts the preparation technology of granulation to LiFePO4/graphene composite material, 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 preparation method for lithium iron phosphate battery positive material, the method comprises the steps:
1) preparation of LiFePO4/graphene composite material
A. lithium solution is prepared: by 3.78g lithium hydroxide (LiOHH 2o, 0.09mol) be dissolved in 200ml deionized water and be mixed with lithium hydroxide solution;
B. graphene dispersing solution is prepared: 0.1g graphene nanometer sheet is added 10ml deionized water, ultrasonic disperse 15min;
C. hydro-thermal reaction: step a and b gained solution are added in magnetic agitation reactor, adds 2.97g phosphoric acid (H after stirring 3pO 4, 99%, 0.03mol) and 8.34g ferrous sulfate (FeSO 47H 2o, 0.03mol), the temperature in stainless steel cauldron controlled at 160 DEG C, reaction 6h, pours out reactant liquor after naturally cooling to normal temperature, after filtration, washing, obtains LiFePO4/graphene composite material after drying;
2) composite material granulation: described LiFePO4/graphene composite material is added 1g polyacrylic acid, and granulation obtains the particulate of 1 ~ 10 μm;
3) preparation of anode material of lithium battery
D. by step 2) gained composite material microparticles mixes in mixed powder machine with 0.05g graphene nanometer sheet;
E. LiFePO4/graphene composite material steps d gained being coated with graphene nanometer sheet mixes with 1g polyacrylic acid, and add suitable quantity of water, stirring, make slurry, be applied in aluminum foil current collector, after to be dried, carry out high-temperature vacuum 200 DEG C process, namely can be used as electrode material of lithium battery application.
Embodiment 2
A preparation method for lithium iron phosphate battery positive material, the method comprises the steps:
1) preparation of LiFePO4/graphene composite material
A. lithium solution is prepared: by 2.52g lithium hydroxide (LiOHH 2o, 0.06mol) be dissolved in 200ml deionized water and be mixed with lithium hydroxide solution;
B. graphene dispersing solution is prepared: 0.05g graphene nanometer sheet is added 10ml deionized water, ultrasonic disperse 20min;
C. hydro-thermal reaction: step a and b gained solution are added in magnetic agitation reactor, adds 2.97g phosphoric acid (H after stirring 3pO 4, 99%, 0.03mol) and 8.34g ferrous sulfate (FeSO 47H 2o, 0.03mol), the temperature in stainless steel cauldron controlled at 150 DEG C, reaction 6h, pours out reactant liquor after naturally cooling to normal temperature, after filtration, washing, obtains LiFePO4/graphene composite material after drying;
2) composite material granulation: described LiFePO4/graphene composite material is added 1g polyacrylic acid, and granulation obtains the particulate of 1 ~ 10 μm;
3) preparation of anode material of lithium battery
D. by step 2) gained composite material microparticles mixes in mixed powder machine with 0.05g graphene nanometer sheet;
E. LiFePO4/graphene composite material steps d gained being coated with graphene nanometer sheet mixes with 1g polyacrylic acid, and add suitable quantity of water, stirring, make slurry, be applied in aluminum foil current collector, after to be dried, carry out high-temperature vacuum 200 DEG C process, namely can be used as electrode material of lithium battery application.
Embodiment 3
A preparation method for lithium iron phosphate battery positive material, the method comprises the steps:
1) preparation of LiFePO4/graphene composite material
A. lithium solution is prepared: by 2.10g lithium hydroxide (LiOHH 2o, 0.05mol) be dissolved in 200ml deionized water and be mixed with lithium hydroxide solution;
B. graphene dispersing solution is prepared: 0.05g graphene nanometer sheet is added 10ml deionized water, ultrasonic disperse 15min;
C. hydro-thermal reaction: step a and b gained solution are added in magnetic agitation reactor, adds 2.97g phosphoric acid (H after stirring 3pO 4, 99%, 0.03mol) and 8.34g ferrous sulfate (FeSO 47H 2o, 0.03mol), the temperature in stainless steel cauldron controlled at 150 DEG C, reaction 6h, pours out reactant liquor after naturally cooling to normal temperature, after filtration, washing, obtains LiFePO4/graphene composite material after drying;
2) composite material granulation: described LiFePO4/graphene composite material is added 1g polyacrylic acid, and granulation obtains the particulate of 1 ~ 10 μm;
3) preparation of anode material of lithium battery
D. by step 2) gained composite material microparticles mixes in mixed powder machine with 0.05g graphene nanometer sheet;
E. LiFePO4/graphene composite material steps d gained being coated with graphene nanometer sheet mixes with 1g polyacrylic acid, and add suitable quantity of water, stirring, make slurry, be applied in aluminum foil current collector, after to be dried, carry out high-temperature vacuum 200 DEG C process, namely can be used as electrode material of lithium battery application.
Embodiment 4
A preparation method for lithium iron phosphate battery positive material, the method comprises the steps:
1) preparation of LiFePO4/graphene composite material
A. lithium solution is prepared: by 3.78g lithium hydroxide (LiOHH 2o, 0.09mol) be dissolved in 200ml deionized water and be mixed with lithium hydroxide solution;
B. graphene dispersing solution is prepared: 0.2g graphene nanometer sheet is added 10ml deionized water, ultrasonic disperse 30min;
C. hydro-thermal reaction: step a and b gained solution are added in magnetic agitation reactor, adds 2.97g phosphoric acid (H after stirring 3pO 4, 99%, 0.03mol) and 8.34g ferrous sulfate (FeSO 47H 2o, 0.03mol), the temperature in stainless steel cauldron controlled at 160 DEG C, reaction 8h, pours out reactant liquor after naturally cooling to normal temperature, after filtration, washing, obtains LiFePO4/graphene composite material after drying;
2) composite material granulation: described LiFePO4/graphene composite material is added 1g polyacrylic acid, and granulation obtains the particulate of 1 ~ 10 μm;
3) preparation of anode material of lithium battery
D. by step 2) gained composite material microparticles mixes in mixed powder machine with 0.05g graphene nanometer sheet;
E. LiFePO4/graphene composite material steps d gained being coated with graphene nanometer sheet mixes with 1g polyacrylic acid, and add suitable quantity of water, stirring, make slurry, be applied in aluminum foil current collector, after to be dried, carry out high-temperature vacuum 210 DEG C process, namely can be used as electrode material of lithium battery application.
Embodiment 5
A preparation method for lithium iron phosphate battery positive material, the method comprises the steps:
1) preparation of LiFePO4/graphene composite material
A. lithium solution is prepared: by 3.78g lithium hydroxide (LiOHH 2o, 0.09mol) be dissolved in 200ml deionized water and be mixed with lithium hydroxide solution;
B. graphene dispersing solution is prepared: 0.05g graphene nanometer sheet is added 10ml deionized water, ultrasonic disperse 10min;
C. hydro-thermal reaction: step a and b gained solution are added in magnetic agitation reactor, adds 2.97g phosphoric acid (H after stirring 3pO 4, 99%, 0.03mol) and 8.34g ferrous sulfate (FeSO 47H 2o, 0.03mol), the temperature in stainless steel cauldron controlled at 120 DEG C, reaction 12h, pours out reactant liquor after naturally cooling to normal temperature, after filtration, washing, obtains LiFePO4/graphene composite material after drying;
2) composite material granulation: described LiFePO4/graphene composite material is added 1g polyacrylic acid, and granulation obtains the particulate of 1 ~ 10 μm;
3) preparation of anode material of lithium battery
D. by step 2) gained composite material microparticles mixes in mixed powder machine with 0.05g graphene nanometer sheet;
E. LiFePO4/graphene composite material steps d gained being coated with graphene nanometer sheet mixes with 1g polyacrylic acid, and add suitable quantity of water, stirring, make slurry, be applied in aluminum foil current collector, after to be dried, carry out high-temperature vacuum 180 DEG C process, namely can be used as electrode material of lithium battery application.
Comparative example 1
A preparation method for lithium iron phosphate battery positive material, the method comprises the steps:
1) preparation of LiFePO4/graphene composite material
A. lithium solution is prepared: by 3.78g lithium hydroxide (LiOHH 2o, 0.09mol) be dissolved in 200ml deionized water and be mixed with lithium hydroxide solution;
B. graphene dispersing solution is prepared: 0.1g graphene nanometer sheet is added 10ml deionized water, ultrasonic disperse 15min;
C. hydro-thermal reaction: step a and b gained solution are added in magnetic agitation reactor, adds 2.97g phosphoric acid (H after stirring 3pO 4, 99%, 0.03mol) and 8.34g ferrous sulfate (FeSO 47H 2o, 0.03mol), the temperature in stainless steel cauldron controlled at 160 DEG C, reaction 6h, pours out reactant liquor after naturally cooling to normal temperature, after filtration, washing, obtains LiFePO4/graphene composite material after drying;
2) composite material granulation: described LiFePO4/graphene composite material is added 1g polyacrylic acid, and granulation obtains the particulate of 1 ~ 10 μm;
3) preparation of anode material of lithium battery
LiFePO4/Graphene composite particles is mixed with 1g polyacrylic acid, and adds suitable quantity of water, stirring, make slurry, be applied in aluminum foil current collector, after to be dried, carry out high-temperature vacuum 200 DEG C process, namely can be used as electrode material of lithium battery application.
Comparative example 2
A preparation method for lithium iron phosphate battery positive material, the method comprises the steps:
1) preparation of LiFePO4/graphene composite material
A. lithium solution is prepared: by 3.78g lithium hydroxide (LiOHH 2o, 0.09mol) be dissolved in 200ml deionized water and be mixed with lithium hydroxide solution;
B. graphene dispersing solution is prepared: 0.1g graphene nanometer sheet is added 10ml deionized water, ultrasonic disperse 15min;
C. hydro-thermal reaction: step a and b gained solution are added in magnetic agitation reactor, adds 2.97g phosphoric acid (H after stirring 3pO 4, 99%, 0.03mol) and 8.34g ferrous sulfate (FeSO 47H 2o, 0.03mol), the temperature in stainless steel cauldron controlled at 160 DEG C, reaction 6h, pours out reactant liquor after naturally cooling to normal temperature, after filtration, washing, obtains LiFePO4/graphene composite material after drying;
2) preparation of anode material of lithium battery
D. step c gained composite material is mixed in mixed powder machine with 0.05g graphene nanometer sheet;
E. LiFePO4/graphene composite material steps d gained being coated with graphene nanometer sheet mixes with 1g polyacrylic acid, and add suitable quantity of water, stirring, make slurry, be applied in aluminum foil current collector, after to be dried, carry out high-temperature vacuum 200 DEG C process, namely can be used as electrode material of lithium battery application.
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 acting in conjunction of the graphene nanometer sheet being coated on composite material surface are conducive to the raising (comparative example 1 and comparative example 1) of positive electrode performance, adopt prilling to improve capacity and the cycle performance (comparative example 1 and comparative example 2) of positive electrode.
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 (10)

1. a preparation method for lithium iron phosphate battery positive material, is characterized in that, the method comprises the steps:
1) LiFePO4/graphene composite material is prepared:
A. lithium solution is prepared: soluble lithium compounds is dissolved in deionized water and makes solution;
B. graphene dispersing solution is prepared: be scattered in deionized water through ultrasonic disperse by graphene uniform;
C. hydro-thermal reaction: add in magnetic agitation reactor by step a and b gained solution, add ferrous sulfate and phosphoric acid by atomic ratio Li: Fe: P=1 ~ 3.5: 1: 1, filters after stirring, washing and dry LiFePO4/graphene composite material;
2) composite material granulation: add binding agent in described LiFePO4/graphene composite material, granulation obtains the particulate of 1 ~ 10 μm;
3) anode material of lithium battery is prepared:
D. blend step 2 in mixed powder machine) gained composite material microparticles and graphene nanometer sheet;
E. LiFePO4/graphene composite material steps d gained being coated with graphene nanometer sheet mixes with binding agent, homogenate and drying, then high-temperature vacuum process at 180 ~ 220 DEG C.
2. the preparation method of lithium iron phosphate battery positive material according to claim 1, it is characterized in that, described soluble lithium compounds is lithium acetate, lithium hydroxide, lithium nitrate, lithium carbonate, lithium chloride or lithium oxalate.
3. the preparation method of lithium iron phosphate battery positive material according to claim 1, it is characterized in that, described hydro-thermal reaction reacts at least 3h at 100 ~ 200 DEG C.
4. the preparation method of lithium iron phosphate battery positive material according to claim 1, it is characterized in that, in solution described in step c, the mass ratio of LiFePO4 and Graphene is 100: 1 ~ 1: 1.
5. the preparation method of lithium iron phosphate battery positive material according to claim 4, it is characterized in that, in solution described in step c, the mass ratio of LiFePO4 and Graphene is 20: 1.
6. the preparation method of lithium iron phosphate battery positive material according to claim 1, it is characterized in that, described binding agent is sodium alginate, shitosan, sodium cellulose glycolate or polyacrylic acid.
7. the preparation method of lithium iron phosphate battery positive material according to claim 1, is characterized in that, step 2) mass ratio 1: 1 ~ 1: 50 of LiFePO4 in described binding agent and composite material.
8. the preparation method of lithium iron phosphate battery positive material according to claim 1, it is characterized in that, in composite material microparticles described in steps d, the mass ratio of LiFePO4 and graphene nanometer sheet is 100: 1 ~ 1: 1.
9. the preparation method of lithium iron phosphate battery positive material according to claim 8, it is characterized in that, in composite material microparticles described in steps d, the mass ratio of LiFePO4 and graphene nanometer sheet is 20: 1.
10. the preparation method of lithium iron phosphate battery positive material according to claim 1, is characterized in that, the mass ratio 1: 1 ~ 1: 50 of LiFePO4 in binding agent described in step e and composite material.
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CN107256960A (en) * 2017-08-06 2017-10-17 长沙小新新能源科技有限公司 A kind of composite positive pole, its preparation method and the lithium ion battery comprising the composite positive pole
CN107394114A (en) * 2017-07-05 2017-11-24 东莞中汽宏远汽车有限公司 Anode material of lithium battery and preparation method thereof and lithium battery anode, lithium battery
CN107394139A (en) * 2017-07-05 2017-11-24 东莞中汽宏远汽车有限公司 Compound anode material of lithium battery and preparation method thereof and lithium battery anode, lithium battery
CN107919462A (en) * 2017-10-13 2018-04-17 苏州艾维科斯园林设备有限公司 A kind of preparation process of the energy-efficient jetting machine of new energy lithium battery
CN114464809A (en) * 2022-01-25 2022-05-10 牛墨石墨烯应用科技有限公司 Graphene-coated lithium ion battery and preparation method thereof
CN116154152A (en) * 2022-12-16 2023-05-23 贵州胜泽威化工有限公司 Lithium iron phosphate battery positive electrode slurry and preparation method thereof

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