CN111725477A - Preparation method of dry-process electrode material of lithium ion battery - Google Patents
Preparation method of dry-process electrode material of lithium ion battery Download PDFInfo
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- CN111725477A CN111725477A CN202010548524.XA CN202010548524A CN111725477A CN 111725477 A CN111725477 A CN 111725477A CN 202010548524 A CN202010548524 A CN 202010548524A CN 111725477 A CN111725477 A CN 111725477A
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- dry
- active particles
- graphene
- electrode material
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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
- H01M4/0402—Methods of deposition of the material
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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
- H01M4/0402—Methods of deposition of the material
- H01M4/0419—Methods of deposition of the material involving spraying
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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
- H01M4/0402—Methods of deposition of the material
- H01M4/0421—Methods of deposition of the material involving vapour deposition
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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
Abstract
A preparation method of a dry-process electrode material of a lithium ion battery comprises the following steps: growing graphene serving as a conductive agent on the outer layer of the active particles in a chemical vapor deposition or electrostatic spraying mode; or electrostatically spraying graphene oxide on the surface of the active particles, and reducing the graphene oxide into graphene through subsequent reaction with hydrogen; and then coating the polymer binder powder on the outer layers of the active particles and the graphene by an electrostatic spraying method to form a uniformly mixed dry material. According to the invention, the electrode material is mixed without a solvent by virtue of the excellent fluidity of the micro-nano grade raw material, and in addition, the obtained electrode material can directly realize a conductive path between active particles.
Description
Technical Field
The invention belongs to the field of battery manufacturing, and particularly relates to a preparation method for realizing a dry-process electrode material of a lithium ion battery through chemical vapor deposition and electrostatic spraying processes.
Background
With global energy shortage and environmental protection awareness increasing, new energy development becomes a current important development direction, and lithium ion batteries become a hotspot of the energy industry by virtue of the advantages of high working voltage, no memory effect, small self-discharge, long cycle life and the like, and are widely applied to mobile electronic products such as mobile phones, computers and the like.
The electrodes of commercial lithium ion batteries are produced by applying a wet coating to the current collector. The slurry contains active substances, conductive additives and a binder dissolved in an organic solvent or water, and the specific material type and proportion depend on the system of the binder. For a common electrode system, the electrode drying process is the most energy consuming link in the lithium ion battery production process. On a production line for producing 100 ten thousand batteries every year, the energy consumption of the coating and drying processes of 20.5 Ah and 3.7V lithium ion batteries is about 51 percent of the total energy consumption, and most of the energy consumption is used for heating large-scale drying devices and compensating energy loss.
In addition, the coating or slurry casting process commonly used for the electrodes of lithium ion batteries has the following disadvantages: (1) the treatment of harmful substances such as waste gas is required; (2) residual solvent in the coated electrode may reduce the operating life of the battery; (3) the binder dissolved at the surface of the coated active material increases the resistivity of the battery, thereby reducing the energy density and power density of the lithium battery; (4) low electrode compaction density, resulting in low energy density, high resistance and low cycle life; (5) the process cycle is long.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of a dry-method electrode material of a lithium ion battery. The invention adopts the methods of electrostatic spraying or chemical vapor deposition and the like to realize the uniform mixing of the electrode raw materials under the dry condition and can directly realize the conductive path.
The technical scheme of the invention is as follows:
a preparation method of a dry-process electrode material of a lithium ion battery is characterized by comprising the following steps: growing graphene serving as a conductive agent on the outer layer of the active particles in a chemical vapor deposition or electrostatic spraying mode; and then coating the polymer binder powder on the outer layers of the active particles and the graphene by an electrostatic spraying method to form a uniformly mixed dry material.
In one embodiment, the active particles are selected from one of lithium iron phosphate, lithium cobaltate, and lithium nickel cobalt manganese oxide.
In one embodiment, the polymeric binder powder is selected from one of polyvinylidene fluoride (PVDF), polytrifluoroethylene (TrFE), and Polytetrafluoroethylene (PTFE), or a mixture of two or more of polyvinylidene fluoride (PVDF), polytrifluoroethylene (TrFE), and Polytetrafluoroethylene (PTFE).
In one embodiment, the active particles are present in a dry material at a mass fraction of 70-95%, the graphene is present in a dry material at a mass fraction of 2-20%, and the binder is present in a dry material at a mass fraction of 2-20%.
According to the invention, the electrode material is mixed without a solvent by virtue of the excellent fluidity of the micro-nano grade raw material, and in addition, the obtained material can directly realize a conductive path between active particles.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention.
The experimental procedures in the following examples are conventional unless otherwise specified. The raw materials and reagent materials used in the following examples are all commercially available products unless otherwise specified.
The first embodiment is as follows:
70 g of nickel cobalt lithium manganate powder is flatly laid on a substrate of a chemical vapor deposition device, 10 g of graphene layers are grown on the surfaces of active particles through a chemical vapor deposition method, and 20 g of polyvinylidene fluoride powder is coated on the outer layers of reaction products through an electrostatic deposition method, so that the preparation process of the dry electrode material is realized.
Example two:
the preparation method comprises the steps of flatly paving 85 g of lithium iron phosphate powder on a substrate of a chemical vapor deposition device, depositing 5 g of graphene oxide layers on the surfaces of active particles through an electrostatic spraying method, and enabling the active particles uniformly coated with graphene oxide to fully react with hydrogen at a high temperature to obtain the graphene-coated active particles. The outer layer of the reaction product is coated with 10 g of vinylidene fluoride and trifluoroethylene mixture powder (vinylidene fluoride and trifluoroethylene are mixed according to the ratio of 1: 1) by an electrostatic deposition method, so that the preparation process of the dry electrode material is realized.
Example three:
70 g of lithium iron phosphate powder is flatly laid on a substrate of a chemical vapor deposition device, 20 g of graphene layers are grown on the surfaces of active particles through a chemical vapor deposition method, and 10 g of polytetrafluoroethylene powder is coated on the outer layers of reaction products through an electrostatic deposition method, so that the preparation process of the dry-method electrode material is realized.
Example four:
95 g of lithium cobaltate powder is flatly laid on a substrate of a chemical vapor deposition device, 2 g of graphene oxide layers are deposited on the surfaces of active particles by an electrostatic spraying method, and then the active particles uniformly coated with graphene oxide fully react with hydrogen at high temperature to obtain the graphene-coated active particles. The outer layer of the reaction product is coated with 3 g of vinylidene fluoride and tetrafluoroethylene mixture powder (vinylidene fluoride and tetrafluoroethylene are mixed according to the ratio of 1: 1) by an electrostatic deposition method, so that the preparation process of the dry electrode material is realized.
Example five:
90 g of lithium cobaltate powder is flatly laid on a substrate of a chemical vapor deposition device, 8 g of graphene layers are grown on the surfaces of active particles by a chemical vapor deposition method, and 2 g of polytrifluoroethylene powder is coated on the outer layer of a reaction product by an electrostatic deposition method, so that the preparation process of the dry-process electrode material is realized.
Example six:
85 g of lithium nickel manganese cobaltate powder is flatly laid on a substrate of a chemical vapor deposition device, 5 g of graphene oxide layers are deposited on the surfaces of active particles through an electrostatic spraying method, and then the active particles uniformly coated with graphene oxide fully react with hydrogen at high temperature to obtain the graphene-coated active particles. The outer layer of the reaction product is coated with 10 g of trifluoroethylene and tetrafluoroethylene mixture powder (the trifluoroethylene and the tetrafluoroethylene are mixed according to the ratio of 1: 1) by an electrostatic deposition method, so that the preparation process of the dry electrode material is realized.
Claims (4)
1. A preparation method of a dry-process electrode material of a lithium ion battery is characterized by comprising the following steps: growing graphene serving as a conductive agent on the outer layer of the active particles in a chemical vapor deposition or electrostatic spraying mode; or electrostatically spraying graphene oxide on the surface of the active particles, and reducing the graphene oxide into graphene through subsequent reaction with hydrogen; and then coating the polymer binder powder on the outer layers of the active particles and the graphene by an electrostatic spraying method to form a uniformly mixed dry material.
2. The method for preparing the dry-process electrode material of the lithium ion battery according to claim 1, wherein the active particles are selected from one of lithium iron phosphate, lithium cobaltate and lithium nickel cobalt manganese oxide.
3. The method for preparing a dry electrode material for a lithium ion battery according to claim 1, wherein the polymer binder powder is selected from one of polyvinylidene fluoride powder, trifluoroethylene powder, and tetrafluoroethylene powder; or a mixture of two or more of polyvinylidene fluoride powder, trifluoroethylene powder and tetrafluoroethylene powder.
4. The method for preparing the dry electrode material of the lithium ion battery according to claim 1, wherein the dry material comprises 70-95% by mass of active particles, 2-20% by mass of graphene and 2-20% by mass of binder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010548524.XA CN111725477A (en) | 2020-06-16 | 2020-06-16 | Preparation method of dry-process electrode material of lithium ion battery |
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| CN202010548524.XA CN111725477A (en) | 2020-06-16 | 2020-06-16 | Preparation method of dry-process electrode material of lithium ion battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839045A (en) * | 2021-11-30 | 2021-12-24 | 北京石墨烯技术研究院有限公司 | Graphene/lithium composite material and preparation method and application thereof |
| CN116217765A (en) * | 2021-12-03 | 2023-06-06 | 中昊晨光化工研究院有限公司 | Polytetrafluoroethylene dispersion resin for dry electrode binder and preparation method thereof |
| CN117154018A (en) * | 2023-09-04 | 2023-12-01 | 上海大学 | Dry electrode manufacturing method and manufacturing equipment |
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| CN1677722A (en) * | 2004-03-31 | 2005-10-05 | 罗姆和哈斯公司 | Method of forming an electrode structure useful in energy storage devices |
| CN102148368A (en) * | 2011-02-24 | 2011-08-10 | 宁波工程学院 | Preparation method of lithium ion battery anode composite material and special device thereof |
| CN104701034A (en) * | 2015-03-19 | 2015-06-10 | 南昌大学 | Preparation method of light-wave reduced grapheme membrane electrode |
| CN106104858A (en) * | 2014-03-10 | 2016-11-09 | 麦斯韦尔技术股份有限公司 | Method and apparatus for polymer fibrillation under the electric field |
| CN106784603A (en) * | 2016-12-28 | 2017-05-31 | 珠海银隆新能源有限公司 | A kind of preparation method of current collector coatings |
| CN108666533A (en) * | 2018-05-16 | 2018-10-16 | 清华大学深圳研究生院 | A kind of preparation method and application of lithium-sulfur cell sulfur electrode |
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2020
- 2020-06-16 CN CN202010548524.XA patent/CN111725477A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1677722A (en) * | 2004-03-31 | 2005-10-05 | 罗姆和哈斯公司 | Method of forming an electrode structure useful in energy storage devices |
| CN102148368A (en) * | 2011-02-24 | 2011-08-10 | 宁波工程学院 | Preparation method of lithium ion battery anode composite material and special device thereof |
| CN106104858A (en) * | 2014-03-10 | 2016-11-09 | 麦斯韦尔技术股份有限公司 | Method and apparatus for polymer fibrillation under the electric field |
| CN104701034A (en) * | 2015-03-19 | 2015-06-10 | 南昌大学 | Preparation method of light-wave reduced grapheme membrane electrode |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839045A (en) * | 2021-11-30 | 2021-12-24 | 北京石墨烯技术研究院有限公司 | Graphene/lithium composite material and preparation method and application thereof |
| CN116217765A (en) * | 2021-12-03 | 2023-06-06 | 中昊晨光化工研究院有限公司 | Polytetrafluoroethylene dispersion resin for dry electrode binder and preparation method thereof |
| CN116217765B (en) * | 2021-12-03 | 2024-04-02 | 中昊晨光化工研究院有限公司 | Polytetrafluoroethylene dispersion resin for dry electrode binder and preparation method thereof |
| CN117154018A (en) * | 2023-09-04 | 2023-12-01 | 上海大学 | Dry electrode manufacturing method and manufacturing equipment |
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