CN109326776A - A kind of high-performance lithium iron phosphate cathode material and preparation method thereof - Google Patents

A kind of high-performance lithium iron phosphate cathode material and preparation method thereof Download PDF

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Publication number
CN109326776A
CN109326776A CN201810959931.2A CN201810959931A CN109326776A CN 109326776 A CN109326776 A CN 109326776A CN 201810959931 A CN201810959931 A CN 201810959931A CN 109326776 A CN109326776 A CN 109326776A
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CN
China
Prior art keywords
iron phosphate
preparation
lithium iron
lithium
cathode material
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CN201810959931.2A
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Chinese (zh)
Inventor
颜小雄
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Hunan Yue Yue Battery Material Co Ltd
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Hunan Yue Yue Battery Material Co Ltd
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Priority to CN201810959931.2A priority Critical patent/CN109326776A/en
Publication of CN109326776A publication Critical patent/CN109326776A/en
Pending legal-status Critical Current

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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
    • H01M4/366—Composites as layered products
    • 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
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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

Abstract

The present invention relates to a kind of high-performance lithium iron phosphate cathode material and preparation method thereof, include the following steps: prepared by (1) slurry: molysite, microcosmic salt are added in aqueous slkali, heating reaction obtains ferrophosphorus compound pulp；(2) wet ball grinding: being added doping vario-property agent, carbon source and lithium salts in the slurry, and wet ball grinding to granularity is 50-150nm, obtains powder；(3) high temperature sintering: powder is sintered under an inert atmosphere, from room temperature to 600~700 DEG C, and is kept for 3 hours, is obtained lithium iron phosphate positive material after cooling.

Description

A kind of high-performance lithium iron phosphate cathode material and preparation method thereof
Technical field
The present invention relates to lithium battery material preparation, a kind of high-performance lithium iron phosphate cathode material and its preparation side are specifically disclosed Method.
Background technique
With gradually using up for world petroleum resource, the research and development of lithium ion battery is increasingly by the weight of people Depending on the performance of lithium ion battery depends primarily on its positive and negative electrode material, and LiFePO4 is a kind of positive material of lithium ion battery Material, security performance and cycle life are all that other battery materials are incomparable, meet the need of the frequent charge and discharge of electric vehicle It wants, and is easier to be used in series by the high capacity lithium ion battery of positive electrode of LiFePO4, can be provided for electric vehicle higher Power.In addition, LiFePO4 have it is nontoxic, pollution-free, have a safety feature, raw material sources are extensive, cheap, the service life is long The advantages that, it is the ideal positive electrode of lithium ion battery.But LiFePO4 electronic conductivity is low, ion diffusion is slow, so phosphorus Sour iron lithium material must coat the performance that material could be promoted with nanosizing by charcoal.
Application No. is 20101029722.6 Chinese patents to disclose a kind of preparation method of LiFePO 4 material, passes through Coprecipitation obtains nanoscale lithium iron phosphate particles, then obtains anode material for lithium-ion batteries by being spray-dried sintering, but It is that the nano-scale lithium iron phosphate material composition that this method is formed is unevenly distributed, particle diameter distribution is poor, and need to be de- by repeatedly washing Water is dry, consumes energy very big.
Summary of the invention
It is an object of the invention to: a kind of distribution reaction to solve the above problem is consumed energy lower, product cut size distribution It is good, lithium iron phosphate positive material of high performance-price ratio and preparation method thereof.
The technical solution adopted by the present invention is that such:
A kind of preparation method of high-performance lithium iron phosphate cathode material, the specific steps are as follows:
(1) prepared by slurry: molysite, microcosmic salt being added in aqueous slkali, heating reaction obtains ferrophosphorus compound pulp；
(2) wet ball grinding: being added doping vario-property agent, carbon source and lithium salts in the slurry, and wet ball grinding to granularity is 50- 150nm obtains powder；
(3) high temperature sintering: powder is sintered under an inert atmosphere, and from room temperature to 600~700 DEG C, and holding 3 is small When, lithium iron phosphate positive material is obtained after cooling.
Further, the lithium salts is lithium hydroxide, lithium carbonate or lithium fluoride.
Further, doping vario-property agent is magnesia, and carbon source is 10% polyethylene glycol.
Further, the inert atmosphere is nitrogen or argon atmosphere.
Further, the rate of the heating is 5 DEG C/min.
In conclusion due to the adoption of the above technical scheme, the beneficial effects of the present invention are:
The present invention prepares lithium iron phosphate positive material by way of stepwise reaction, and preparation process is simple, lower, institute of consuming energy It is smaller to obtain lithium iron phosphate positive material partial size, and is evenly distributed, carbon coating effect is good, and compacted density is high, and gram volume is high, with this The performance of lithium ion battery that material is prepared is preferable, has high performance-price ratio, is a kind of ferric phosphate suitable for production application Lithium anode material.
Specific embodiment
Embodiment 1
A kind of preparation method of high-performance lithium iron phosphate cathode material, the specific steps are as follows:
(1) prepared by slurry: molysite, microcosmic salt being added in aqueous slkali, heating reaction obtains ferrophosphorus compound pulp；
(2) wet ball grinding: doping lithium hydroxide, magnesia and 10% polyethylene glycol are added in the slurry, wet ball grinding is extremely Granularity is 50-150nm, obtains powder；
(3) high temperature sintering: powder is sintered in a nitrogen atmosphere, from room temperature to 650 DEG C, the rate of heating is 5 DEG C/ Min, and kept for 3 hours, lithium iron phosphate positive material is obtained after cooling.
Embodiment 2
A kind of preparation method of high-performance lithium iron phosphate cathode material, the specific steps are as follows:
(1) prepared by slurry: molysite, microcosmic salt being added in aqueous slkali, heating reaction obtains ferrophosphorus compound pulp；
(2) wet ball grinding: lithium carbonate, magnesia and 10% polyethylene glycol, wet ball grinding to granularity are added in the slurry is 50-150nm obtains powder；
(3) high temperature sintering: powder is sintered under an argon atmosphere, from room temperature to 600 DEG C, the rate of heating is 5 DEG C/ Min, and kept for 3 hours, lithium iron phosphate positive material is obtained after cooling.

Claims (5)

1. a kind of preparation method of high-performance lithium iron phosphate cathode material, it is characterised in that: specific step is as follows:
(1) prepared by slurry: molysite, microcosmic salt being added in aqueous slkali, heating reaction obtains ferrophosphorus compound pulp；
(2) wet ball grinding: being added doping vario-property agent, carbon source and lithium salts in the slurry, and wet ball grinding to granularity is 50-150nm, obtains To powder；
(3) high temperature sintering: powder is sintered under an inert atmosphere, from room temperature to 600~700 DEG C, and is kept for 3 hours, cold But lithium iron phosphate positive material is obtained afterwards.
2. a kind of preparation method of high-performance lithium iron phosphate cathode material according to claim 1, it is characterised in that: described Lithium salts is lithium hydroxide, lithium carbonate or lithium fluoride.
3. a kind of preparation method of high-performance lithium iron phosphate cathode material according to claim 1, it is characterised in that: doping Modifying agent is magnesia, and carbon source is 10% polyethylene glycol.
4. a kind of preparation method of high-performance lithium iron phosphate cathode material according to claim 1, it is characterised in that: described Inert atmosphere is nitrogen or argon atmosphere.
5. preparation method according to claim 1, it is characterised in that: the rate of the heating is 5 DEG C/min.
CN201810959931.2A 2018-08-21 2018-08-21 A kind of high-performance lithium iron phosphate cathode material and preparation method thereof Pending CN109326776A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810959931.2A CN109326776A (en) 2018-08-21 2018-08-21 A kind of high-performance lithium iron phosphate cathode material and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810959931.2A CN109326776A (en) 2018-08-21 2018-08-21 A kind of high-performance lithium iron phosphate cathode material and preparation method thereof

Publications (1)

Publication Number Publication Date
CN109326776A true CN109326776A (en) 2019-02-12

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Country Status (1)

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CN (1) CN109326776A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101237043A (en) * 2008-01-31 2008-08-06 东北师范大学 Method for making ferrous lithium phosphate/carbon compound material of high active disorderly ferric phosphate
CN103258995A (en) * 2013-06-06 2013-08-21 郑州瑞普生物工程有限公司 Preparation method of lithium iron phosphate material
CN108288698A (en) * 2018-01-24 2018-07-17 杭州金马新能源科技有限公司 A kind of preparation method of lithium iron phosphate positive material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101237043A (en) * 2008-01-31 2008-08-06 东北师范大学 Method for making ferrous lithium phosphate/carbon compound material of high active disorderly ferric phosphate
CN103258995A (en) * 2013-06-06 2013-08-21 郑州瑞普生物工程有限公司 Preparation method of lithium iron phosphate material
CN108288698A (en) * 2018-01-24 2018-07-17 杭州金马新能源科技有限公司 A kind of preparation method of lithium iron phosphate positive material

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Application publication date: 20190212

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