CN112687830A - Method for manufacturing lithium ion battery pole plate - Google Patents
Method for manufacturing lithium ion battery pole plate Download PDFInfo
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- CN112687830A CN112687830A CN202011471896.3A CN202011471896A CN112687830A CN 112687830 A CN112687830 A CN 112687830A CN 202011471896 A CN202011471896 A CN 202011471896A CN 112687830 A CN112687830 A CN 112687830A
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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
The invention relates to a method for manufacturing a lithium ion battery pole plate, which comprises the steps of sampling and mixing 80-95% of positive or negative active materials, 2-10% of conductive agents and 3-10% of binders in percentage by mass, carrying out hot press molding on dry powder, melting the binders through temperature and pressure, and bonding the powder to prepare the pole plate. The method cancels the use of NMP solvent, does not need high-precision coating equipment and expensive NMP recovery equipment, has small investment scale, and is energy-saving and environment-friendly. The scheme is suitable for manufacturing ultra-thick lithium ion battery pole plates, the current collectors and the diaphragms are good and few, the energy density of the battery is high, and the cost is low.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a method for manufacturing a lithium ion battery pole plate.
Background
Since the last 90 s, lithium ion batteries have been available for 30 years, and have been widely used in the fields of portable electronic products, electric vehicles, energy storage and the like due to the advantages of small size, light weight, long cycle life, environmental friendliness and the like. In order to meet the requirements of more use scenes, the energy density of the battery needs to be continuously improved, the cost of the battery needs to be reduced, and the common practice is to innovate the application and the process of new materials. In recent years, materials with high energy density, such as high-nickel ternary positive electrode materials and silicon-carbon negative electrode materials, are mature, and the energy density of batteries is continuously improved. The manufacturing process of the lithium ion battery is a breakthrough and the traditional production process is continuously used. The thickness of the electrodes is typically no more than 300 microns due to process limitations. Excessive thickness can cause a series of problems such as the falling off of active substances, low compaction density and the like. This is one of the reasons that the cost of lithium ion batteries is high, and the assembly of thin electrodes into a battery of the same capacity requires more separator and current collector, while reducing the energy density of the battery due to its own weight.
The traditional lithium ion battery adopts a wet coating process, NMP is used as a solvent, active substances, a conductive agent and a binder are prepared into slurry, and then the slurry is coated on positive and negative current collectors. The positive and negative current collectors are copper aluminum foils, and the thickness is generally not more than 20 microns. The pole piece manufactured by the process is thin in thickness, the number of current collectors and diaphragms consumed by the battery is large, and the self weight and cost have negative influences on the energy density and the manufacturing cost of the battery.
Chinese patents CN105849942A, CN207183416U, CN108155346B, etc., adopt three-dimensional conductive current collectors such as foamed aluminum, foamed nickel, foamed copper to make thick electrodes. The cost of the three-dimensional current collector is high, and in addition, the active substances are difficult to completely fill the internal space of the three-dimensional current collector, so that the local capacity of a pole piece is uneven, lithium precipitation of a negative electrode is caused, and potential safety hazards exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for manufacturing a lithium ion battery pole plate.
The technical scheme for realizing the purpose of the invention is as follows: a method for manufacturing a lithium ion battery pole plate comprises the following preparation steps:
s1, sampling and uniformly mixing 80-95% of positive or negative active material, 2-10% of conductive agent and 3-10% of binder by mass percent to obtain mixed powder;
s2, placing a confluence plate grid in a bottom die of a polar plate forming die, pouring the mixed powder into the polar plate forming die, carrying out hot pressing by using a top die of the polar plate forming die, and combining the confluence plate grid and the mixed powder to prepare an electrode polar plate;
and S3, grinding burrs on the edge of the pole plate.
According to the technical scheme, the positive active material is one or more of lithium manganate, lithium iron phosphate, lithium cobaltate, ternary lithium oxide materials and the like.
In the technical scheme, the negative active material is one or more of graphite, lithium titanate and silicon.
In the technical scheme, the conductive agent is one or more of conductive carbon black, graphene, carbon fiber, carbon tube and the like.
The technical scheme is that the adhesive is polyvinylidene fluoride.
After the technical scheme is adopted, the invention has the following positive effects:
(1) the dry powder adopted by the invention is hot-pressed and formed, the active substance, the conductive agent and the binder are mixed and hot-pressed and formed in the polar plate die, the ultra-thick polar plate is suitable for manufacturing, the energy density of the battery is high, and the thickness of the formed polar plate can be more than 5 mm.
(2) The invention is energy-saving, environment-friendly, high in manufacturability and suitable for batch automatic production. And (3) carrying out hot-press molding on the dry powder, melting the binder through temperature and pressure, and bonding the powder to prepare the polar plate. The method cancels the use of NMP solvent, does not need high-precision coating equipment and expensive NMP recovery equipment, has small investment scale, and is energy-saving and environment-friendly. In addition, the manufacturability of the polar plate mould forming is good, and the polar plate mould forming method is suitable for large-scale production.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic diagram of the construction of a busbar grid according to the present invention;
FIG. 2 is a schematic structural diagram of a polar plate forming mold according to the present invention;
fig. 3 is a schematic structural diagram of the positive or negative electrode plate manufactured by the present invention.
In the figure: the plate forming die comprises a bus grid 100, a grid lug 1, a grid bus bar 2, a pole plate forming die 200, a top die 3, a bottom die 4 and a positive or negative pole plate 300.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Referring to fig. 1, a bus plate grid 100 includes plate tabs 1 and plate bus bars 2, and the bus plate grid 100 may be made of copper or aluminum.
Referring to fig. 2, the polar plate forming mold 200 has a top mold 3 and a bottom mold 4, and both the top mold 3 and the bottom mold 4 have a processing function, i.e., the heating temperature is adjustable, and the temperature adjusting range is 150-300 ℃.
The oxide material of the ternary lithium is nickel cobalt lithium manganate, which is called ternary throughout for short.
(example 1)
S1, mixing lithium iron phosphate, conductive carbon black and polyvinylidene fluoride according to a mass ratio of 90%: 5%: 5 percent of the components are uniformly mixed to obtain mixed powder.
And S2, placing the aluminum busbar grid 100 with the thickness of 0.8mm in the bottom die 4 of the polar plate forming die 200, pouring the mixed powder into the bottom die 4, covering the grid busbar 2 of the busbar grid 100 and exposing the grid lug 1 of the busbar grid 100. The temperature of the top die 3 and the bottom die 4 is heated to 170 ℃, the top die 3 of the polar plate forming die 200 applies pressure, the active mixed powder is combined with the busbar 100 to form the negative polar plate 300, and the hot pressing thickness of the negative polar plate is 2 mm.
And S3, grinding burrs on the edge of the plate and floating powder on the plate grid lug 1.
(example 2)
S1, mixing graphite, conductive carbon black and polyvinylidene fluoride powder in a mass ratio of 93%: 3%: the mixture is uniformly mixed according to the ratio of 4 percent to obtain mixed powder.
And S2, placing the 0.5 mm-thick copper busbar grid 100 in the bottom die 4 of the plate forming die 200, pouring the mixed powder into the bottom die 4, covering the grid busbar 2 of the busbar grid 100 and exposing the grid lug 1 of the busbar grid 100. The temperature of the top die 3 and the bottom die 4 is heated to 180 ℃, the top die 3 of the polar plate forming die 200 applies pressure, the active mixed powder is combined with the busbar 100 to form the positive polar plate 300, and the hot pressing thickness of the positive polar plate is 1.2 mm.
And S3, grinding burrs on the edge of the plate and floating powder on the plate grid lug 1.
(example 3)
S1, mixing three powders of ternary, conductive carbon black, carbon nanotube and polyvinylidene fluoride according to a mass ratio of 95%: 1%: 1%: 3 percent of the components are uniformly mixed to obtain mixed powder.
And S2, placing the aluminum busbar grid 100 with the thickness of 1.0mm in the bottom die 4 of the plate forming die 200, pouring the mixed powder into the bottom die 4, covering the grid busbar 2 of the busbar grid 100 and exposing the grid lug 1 of the busbar grid 100. The temperature of the top die 3 and the bottom die 4 is heated to 200 ℃, the top die 3 of the polar plate forming die 200 applies pressure, the active mixed powder is combined with the busbar 100 to form the positive polar plate 300, and the hot pressing thickness of the positive polar plate is 1.2 mm.
And S3, grinding burrs on the edge of the plate and floating powder on the plate grid lug 1.
(example 4)
S1, mixing lithium titanate powder, conductive carbon black powder and polyvinylidene fluoride powder according to the mass ratio of 91%: 4%: 5 percent of the components are uniformly mixed to obtain mixed powder.
And S2, placing the aluminum busbar grid 100 with the thickness of 1.5mm in the bottom die 4 of the plate forming die 200, pouring the mixed powder into the bottom die 4, covering the grid busbar 2 of the busbar grid 100 and exposing the grid lug 1 of the busbar grid 100. The temperature of the top die 3 and the bottom die 4 is heated to 230 ℃, the top die 3 of the polar plate forming die 200 applies pressure, the active mixed powder is combined with the busbar 100 to form the negative polar plate 300, and the hot pressing thickness of the negative polar plate is 2.4 mm.
And S3, grinding burrs on the edge of the plate and floating powder on the plate grid lug 1.
(example 5)
S1, mixing three powders of ternary, conductive carbon black, conductive carbon fiber and polyvinylidene fluoride according to a mass ratio of 95.5%: 1%: 0.5%: 3 percent of the components are uniformly mixed to obtain mixed powder.
And S2, placing the aluminum busbar grid 100 with the thickness of 1.2mm in the bottom die 4 of the plate forming die 200, pouring the mixed powder into the bottom die 4, covering the grid busbar 2 of the busbar grid 100 and exposing the grid lug 1 of the busbar grid 100. The temperature of the top die 3 and the bottom die 4 is heated to 210 ℃, the top die 3 of the polar plate forming die 200 applies pressure, the active mixed powder is combined with the busbar 100 to form the positive polar plate 300, and the hot pressing thickness of the positive polar plate is 2.0 mm.
And S3, grinding burrs on the edge of the plate and floating powder on the plate grid lug 1.
(example 6)
S1, mixing graphite, conductive carbon black and polyvinylidene fluoride powder in a mass ratio of 94.5%: 1%: 4.5 percent of the components are uniformly mixed to obtain mixed powder.
And S2, placing the 0.8 mm-thick copper busbar grid 100 in the bottom die 4 of the plate forming die 200, pouring the mixed powder into the bottom die 4, covering the grid busbar 2 of the busbar grid 100 and exposing the grid lug 1 of the busbar grid 100. The temperature of the top die 3 and the bottom die 4 is heated to 200 ℃, the top die 3 of the polar plate forming die 200 applies pressure, the active mixed powder is combined with the busbar 100 to form the negative polar plate 300, and the hot pressing thickness of the negative polar plate is 1.4 mm.
And S3, grinding burrs on the edge of the plate and floating powder on the plate grid lug 1.
The properties of the batteries obtained in examples 1 to 6 are shown in the following table:
the above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for manufacturing a lithium ion battery pole plate is characterized by comprising the following preparation steps:
s1, sampling and uniformly mixing 80-95% of positive or negative active material, 2-10% of conductive agent and 3-10% of binder by mass percent to obtain mixed powder;
s2, placing a confluence plate grid in a bottom die of a polar plate forming die, pouring the mixed powder into the polar plate forming die, carrying out hot pressing by using a top die of the polar plate forming die, and combining the confluence plate grid and the mixed powder to prepare an electrode polar plate;
and S3, grinding burrs on the edge of the pole plate.
2. The method for manufacturing a lithium ion battery plate according to claim 1, wherein the method comprises the following steps: the positive active material is one or more of lithium oxide materials such as lithium manganate, lithium iron phosphate, lithium cobaltate, ternary lithium and the like.
3. The method for manufacturing a lithium ion battery plate according to claim 1, wherein the method comprises the following steps: the negative active material is one or more of graphite, lithium titanate and silicon.
4. The method for manufacturing a lithium ion battery plate according to claim 1, wherein the method comprises the following steps: the conductive agent is one or more of conductive carbon black, graphene, carbon fiber, carbon tube and the like.
5. The method for manufacturing a lithium ion battery plate according to claim 1, wherein the method comprises the following steps: the binder is polyvinylidene fluoride.
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| CN202011471896.3A CN112687830A (en) | 2020-12-14 | 2020-12-14 | Method for manufacturing lithium ion battery pole plate |
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| CN202011471896.3A CN112687830A (en) | 2020-12-14 | 2020-12-14 | Method for manufacturing lithium ion battery pole plate |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1427492A (en) * | 2001-12-19 | 2003-07-02 | 河南环宇电源股份有限公司 | Manufacturing method of alkaline battery electrode and battery produced using said method |
| 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 |
| 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 |
| CN107403933A (en) * | 2017-07-10 | 2017-11-28 | 天津普兰能源科技有限公司 | A kind of lithium ion battery electrode piece and preparation method thereof and application |
| CN107565086A (en) * | 2016-06-30 | 2018-01-09 | 南通沃德材料科技有限公司 | A kind of battery pole plates preparation method |
| CN109830770A (en) * | 2019-02-18 | 2019-05-31 | 中南大学 | Vast capacity energy storage lithium ion battery with monitoring function |
-
2020
- 2020-12-14 CN CN202011471896.3A patent/CN112687830A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1427492A (en) * | 2001-12-19 | 2003-07-02 | 河南环宇电源股份有限公司 | Manufacturing method of alkaline battery electrode and battery produced using said method |
| 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 |
| 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 |
| CN107565086A (en) * | 2016-06-30 | 2018-01-09 | 南通沃德材料科技有限公司 | A kind of battery pole plates preparation method |
| CN107403933A (en) * | 2017-07-10 | 2017-11-28 | 天津普兰能源科技有限公司 | A kind of lithium ion battery electrode piece and preparation method thereof and application |
| CN109830770A (en) * | 2019-02-18 | 2019-05-31 | 中南大学 | Vast capacity energy storage lithium ion battery with monitoring function |
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Application publication date: 20210420 |