CN112952043A - Preparation method of dry powder pressed brick of lithium ion battery pole piece - Google Patents

Preparation method of dry powder pressed brick of lithium ion battery pole piece Download PDF

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Publication number
CN112952043A
CN112952043A CN202110250930.2A CN202110250930A CN112952043A CN 112952043 A CN112952043 A CN 112952043A CN 202110250930 A CN202110250930 A CN 202110250930A CN 112952043 A CN112952043 A CN 112952043A
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CN
China
Prior art keywords
pole piece
dry
battery pole
lithium ion
ion battery
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Pending
Application number
CN202110250930.2A
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Chinese (zh)
Inventor
张五堂
周中心
熊亮
邵紫龙
江德顺
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Shanghai Lanjun New Energy Technology Co Ltd
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Shanghai Lanjun New Energy Technology Co Ltd
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Priority to CN202110250930.2A priority Critical patent/CN112952043A/en
Publication of CN112952043A publication Critical patent/CN112952043A/en
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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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0433—Molding
    • 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
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • 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
    • H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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

Abstract

The invention relates to a preparation method of a dry powder pressed brick of a lithium ion battery pole piece, which comprises the following steps: (1) preparing a dry mixture: dry-mixing the raw materials of the cathode material or the anode material, and adding hot melt adhesive into the dry-mixed material to obtain a dry mixture; (2) dry mixture is put into a mould: adding the prepared dry mixture into a battery pole piece mold, wherein a substrate sheet is arranged in the mold, the mold is divided into an upper mold and a lower mold, the substrate is placed on the lower mold, and after the dry mixture is placed on the substrate, the upper mold is subjected to cavity-closing pressing; (3) compacting: and extruding the dry pole piece mixture containing the hot sol and filled into the die cavity, and heating in the extrusion process to obtain the lithium ion battery pole piece. Compared with the prior art, the invention has the advantages of simple process, low investment cost, high investment benefit, great reduction of the cost of the power battery, contribution to electric automobiles and the like.

Description

Preparation method of dry powder pressed brick of lithium ion battery pole piece
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a preparation method of a dry powder pressed brick of a lithium ion battery pole piece.
Background
In recent years, the application range of lithium ion batteries is more and more extensive, and lithium ion batteries are widely applied to energy storage power systems such as hydraulic power, firepower, wind power and solar power stations, and a plurality of fields such as electric tools, electric bicycles, electric motorcycles, electric automobiles, military equipment and aerospace. However, the cost of lithium batteries is high, and the processing cost and the raw material cost are main factors. The lithium battery has the advantages of complex manufacturing process, longer process route, large equipment investment and larger operation difficulty.
The main process of manufacturing the conventional lithium ion battery pole piece is to mix and disperse active substances, conductive agents, bonding adhesives and the like with a solvent through a mixer or a dispersion machine to prepare electrode slurry capable of flowing freely through a batching system, a mixer and slurry system, a coating machine, an area density tester, a roller press, a laser thickness gauge, a splitting machine, a die-cutting machine, a CCD and other devices, then uniformly coat the electrode slurry on a copper foil or aluminum foil substrate and perform drying treatment to form a battery pole roll, and then sequentially roll-press, cut and die-cut the battery pole roll to prepare the battery pole piece.
In the existing lithium ion battery pole piece manufacturing process, active substances, conductive agents, bonding glue and the like are uniformly mixed and dispersed with a solvent through a stirrer or a dispersion machine to prepare electrode slurry capable of flowing freely, the uniformity of the conductive agents dispersed in the solvent is difficult to control, the stability and the fluidity of the electrode slurry are greatly changed, the slurry is conveyed remotely and has the problems of caking, precipitation and the like, and the cleaning is difficult when the batch is changed; when the slurry is coated on the base material, the thickness of the film layer is uneven, and the thickness uniformity of the battery pole piece manufactured by the subsequent process is influenced.
In addition, in the drying process, the solvent in the electrode slurry can be volatilized, so that the film layer formed on the surface of the pole piece substrate is cracked; the problems of belt breakage, demoulding, roller sticking and the like exist in the rolling treatment process, and the consistency of the compaction density of the film layer is poor; after slitting and die cutting, the base material of the pole piece is exposed, so that a large amount of burrs exist on the edge of the pole piece of the ion battery. The whole manufacturing process of the battery pole piece is tedious and tedious, the process is complex, the equipment is more and huge, and the investment cost is very high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the preparation method of the dry powder pressed brick for the lithium ion battery pole piece, which has the advantages of simple process, low investment cost, high investment benefit, greatly reduced cost of the power battery and contribution to the electric automobile.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of dry powder pressed bricks of lithium ion battery pole pieces comprises the following steps:
(1) preparing a dry mixture: dry-mixing the raw materials of the cathode material or the anode material, and adding hot melt adhesive into the dry-mixed material to obtain a dry mixture; different adding amounts are obtained according to different types of anode and cathode raw material proportioning experiments; the battery raw material and the thermosol are mixed by a machine to prepare dry mixture.
(2) Dry mixture is put into a mould: adding the prepared dry mixture into a battery pole piece mold, wherein a substrate sheet is arranged in the mold, the mold is divided into an upper mold and a lower mold, the substrate is placed on the lower mold, and after the dry mixture is placed on the substrate, the upper mold is subjected to cavity-closing pressing;
(3) compacting: and extruding the dry pole piece mixture containing the hot sol and filled into the die cavity, and heating in the extrusion process to obtain the lithium ion battery pole piece.
Further, the raw materials of the negative electrode material comprise graphite, a conductive agent, a thickening agent and a binder.
Further, the conductive agent is Keqin superconducting carbon black, the thickening agent is sodium carboxymethylcellulose, and the binder is styrene-butadiene rubber latex.
Further, the base material is copper foil.
Further, the cathode material comprises LiCoO2A conductive agent and a binder.
Further, the conductive agent is Carbon ECP, and the adhesive is PVDF 761.
Further, the substrate is an aluminum foil.
Further, the adding amount of the hot melt adhesive is 0.1-3% of the weight of the dry-mixed materials, and the optimal adding amount is 0.5-1.5%.
Further, the dry mixing time is 1-30min, and the optimal time is 3-15 min.
Further, the heating temperature is 30-130 ℃, the extrusion pressure is 1-3MPa, and the mould is vibrated for 0.5-2min when the compaction is started.
The manufacturing method of the battery pole piece greatly simplifies the process flow, does not need a large number of high-precision mixers, does not need solvents such as NMP (N-methyl pyrrolidone) and the like for pulping, and does not have the problems of slurry precipitation, caking and the like; the pole piece coating process is directly cancelled, so that the problems of uneven pole piece coating thickness or surface density are solved, and the phenomenon of drying and cracking is avoided; the rolling procedure is carried out without a rolling machine, so that the problems of roller sticking, demoulding and the like do not exist; the problem of headaches in the industry is solved without cutting or die cutting, and the safety performance of the battery is greatly improved. The process is simple, the investment cost is low, the investment benefit is high, the cost of the power battery is greatly reduced, and the popularization and the application of the electric automobile are facilitated.
Compared with the prior art, the invention has the following advantages:
(1) the battery raw materials are simply and rapidly dry-mixed by a dry mixer, an added solvent is not needed, and particularly NMP is not used, so that the battery raw materials are energy-saving and environment-friendly;
(2) the hot sol is added into the powder to form dry mixed material, and slurry is not required to be prepared, so that the problems of difficult slurry conveying and precipitation and agglomeration in the prior art are solved;
(3) the dry mixture is directly weighed and molded without using a coating machine, so that the drying of a coating film is reduced, the inconsistency of coating thickness is avoided, and the problems of cracking of a pole piece and the like are avoided;
(4) according to the invention, the dry mixture after being filled into the die is directly heated, vibrated and compacted to form the battery pole piece at one time, and then enters the lamination process, the processes of rolling, slitting, die cutting and the like are not required, the problem of belt breakage caused by rolling is avoided, and the product quality rate and the material utilization rate are greatly improved; the process of slitting and die cutting is omitted, the problem of headaches in the industry is solved, and the safety performance of the battery is greatly improved. The process is simple, the investment cost is low, the investment benefit is high, the cost of the power battery is greatly reduced, and the popularization and the application of the electric automobile are facilitated.
Drawings
FIG. 1 is a schematic diagram of a method for preparing a battery pole piece according to the present invention;
fig. 2 illustrates a conventional method for manufacturing a battery electrode plate.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Not specifically stated, the contents are all mass contents.
Examples
Figure BDA0002966033400000041
Mixing a positive electrode material, a negative electrode material and a separator: celgard 2400 assembles into the laminate polymer battery, adopts the electrolyte as: 1M LiPF6+ EC: DEC ═ 1: 1 (volume ratio), the electrochemical performance test is carried out on a blue battery tester, 6 groups of parallel tests are arranged in total, and the battery performance results are as follows:
numbering Capacity retention rate of 800 times of room temperature cycle% Capacity retention rate% after 800 cycles at 45%
Soft package battery 1 92 90
Soft package battery 2 93 91
Soft package battery 3 92 91
Laminate polymer battery 4 92 90
Soft package battery 5 95 92
Soft package battery 6 94 91
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims (10)

1. A preparation method of dry powder pressed bricks of lithium ion battery pole pieces is characterized by comprising the following steps:
(1) preparing a dry mixture: dry-mixing the raw materials of the cathode material or the anode material, and adding hot melt adhesive into the dry-mixed material to obtain a dry mixture;
(2) dry mixture is put into a mould: adding the prepared dry mixture into a battery pole piece mold, wherein a substrate sheet is arranged in the mold, the mold is divided into an upper mold and a lower mold, the substrate is placed on the lower mold, and after the dry mixture is placed on the substrate, the upper mold is subjected to cavity-closing pressing;
(3) compacting: and extruding the dry pole piece mixture containing the hot sol and filled into the die cavity, and heating in the extrusion process to obtain the lithium ion battery pole piece.
2. The method for preparing the dry powder pressed brick of the lithium ion battery pole piece according to claim 1, wherein the raw materials of the negative electrode material comprise graphite, a conductive agent, a thickening agent and a binder.
3. The method for preparing the dry powder pressed brick of the lithium ion battery pole piece according to claim 2, wherein the conductive agent is Keqin superconducting carbon black, the thickening agent is sodium carboxymethylcellulose, and the binder is styrene butadiene rubber latex.
4. The method for preparing the dry powder pressed brick of the lithium ion battery pole piece according to claim 2, wherein the base material is copper foil.
5. The method for preparing the dry powder pressed brick of the lithium ion battery pole piece according to claim 1, wherein the raw material of the positive electrode material comprises LiCoO2A conductive agent and a binder.
6. The method for preparing the dry powder pressed brick of the lithium ion battery pole piece according to claim 5, wherein the conductive agent is Carbon ECP, and the adhesive is PVDF 761.
7. The method for preparing the dry powder pressed brick of the lithium ion battery pole piece according to claim 5, wherein the base material is aluminum foil.
8. The method for preparing the dry powder pressed brick of the lithium ion battery pole piece according to claim 1, wherein the addition amount of the hot melt adhesive is 0.1-3% of the weight of the dry mixed material.
9. The method for preparing the dry powder pressed brick of the lithium ion battery pole piece according to claim 1, wherein the dry mixing time is 1-30 min.
10. The method for preparing the dry powder pressed brick of the lithium ion battery pole piece according to claim 1, wherein the heating temperature is 30-130 ℃, the extrusion pressure is 1-3MPa, and the mould is vibrated for 0.5-2min when the compaction is started.
CN202110250930.2A 2021-03-08 2021-03-08 Preparation method of dry powder pressed brick of lithium ion battery pole piece Pending CN112952043A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007265889A (en) * 2006-03-29 2007-10-11 Dainippon Printing Co Ltd Electrode plate for nonaqueous electrolytic solution secondary battery, and its manufacturing method as well as nonaqueous electrolytic solution secondary battery
CN102694149A (en) * 2012-06-07 2012-09-26 广东工业大学 Manufacturing equipment and manufacturing method for electrode of power type lithium ion battery
JP2013065478A (en) * 2011-09-19 2013-04-11 Toyota Motor Corp Method for manufacturing lithium ion secondary battery
CN103400993A (en) * 2013-08-14 2013-11-20 青海绿草地新能源科技有限公司 Battery anode and lithium ion battery
CN105070879A (en) * 2015-07-30 2015-11-18 河北中智电池制造有限公司 Technology and equipment for manufacturing energy-saving and environment-friendly lithium battery pole piece
WO2020139823A1 (en) * 2018-12-23 2020-07-02 Worcester Polytechnic Institute Adhesive interlayer for battery electrode through dry manufacturing
CN211099802U (en) * 2019-08-28 2020-07-28 无锡先导智能装备股份有限公司 Coating device
CN112420986A (en) * 2019-08-21 2021-02-26 南京博驰新能源股份有限公司 Method for preparing positive and negative pole pieces of lithium battery by dry method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007265889A (en) * 2006-03-29 2007-10-11 Dainippon Printing Co Ltd Electrode plate for nonaqueous electrolytic solution secondary battery, and its manufacturing method as well as nonaqueous electrolytic solution secondary battery
JP2013065478A (en) * 2011-09-19 2013-04-11 Toyota Motor Corp Method for manufacturing lithium ion secondary battery
CN102694149A (en) * 2012-06-07 2012-09-26 广东工业大学 Manufacturing equipment and manufacturing method for electrode of power type lithium ion battery
CN103400993A (en) * 2013-08-14 2013-11-20 青海绿草地新能源科技有限公司 Battery anode and lithium ion battery
CN105070879A (en) * 2015-07-30 2015-11-18 河北中智电池制造有限公司 Technology and equipment for manufacturing energy-saving and environment-friendly lithium battery pole piece
WO2020139823A1 (en) * 2018-12-23 2020-07-02 Worcester Polytechnic Institute Adhesive interlayer for battery electrode through dry manufacturing
CN112420986A (en) * 2019-08-21 2021-02-26 南京博驰新能源股份有限公司 Method for preparing positive and negative pole pieces of lithium battery by dry method
CN211099802U (en) * 2019-08-28 2020-07-28 无锡先导智能装备股份有限公司 Coating device

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