CN108258187A - A kind of low temperature drying method of electrodes of lithium-ion batteries - Google Patents
A kind of low temperature drying method of electrodes of lithium-ion batteries Download PDFInfo
- Publication number
- CN108258187A CN108258187A CN201810015869.1A CN201810015869A CN108258187A CN 108258187 A CN108258187 A CN 108258187A CN 201810015869 A CN201810015869 A CN 201810015869A CN 108258187 A CN108258187 A CN 108258187A
- Authority
- CN
- China
- Prior art keywords
- pole piece
- lithium
- low temperature
- electrodes
- finished product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention provides a kind of low temperature drying methods of electrodes of lithium-ion batteries, include the following steps：1) battery pole piece semi-finished product by electrode slurry coating on a current collector, are formed；2) battery pole piece semi-finished product are freezed；3) after electrode slurry freezing curing, battery pole piece semi-finished product is sent into vacuum refrigeration environment and are preserved；4) battery pole piece semi-finished product are taken out from vacuum refrigeration environment, completes drying.The present invention can effectively reduce pole piece air blister defect compared to the prior art, reduce the interference of energy consumption, reduction collector oxidation to battery core performance, improve pole piece quality and yields.
Description
Technical field
The present invention relates to a kind of drying means of electrodes of lithium-ion batteries, in particular to a kind of lithium ion cell electrode
The low temperature drying method of piece.
Background technology
Cell size coating is the next process after the completion of slurry is prepared, this process main purpose is by stability
It is good, viscosity is good, good fluidity slurry is uniformly coated on positive and negative anodes collector, then by drying and removing solvent in slurry,
Pole piece manufacture has great importance to lithium battery.
At home in the production of lithium battery pole slice, dry the most commonly used is drum Hot-blast Heating, so-called bulging hot wind is exactly profit
With bulging come hot-air it is continual to lithium battery pole slice dry, pole piece by baking oven rapid draing when.Due to oven temperature
Height, evaporation of the solvent is rapid, and vapor bubbles are easily formed in coating, and bubbles burst forms white round spot, herein being on pole piece
Matter coating is relatively thin, and micro-short circuit is also most easily caused in battery charge and discharge process.
Meanwhile high-temperature drying procedures can also accelerate the oxidation of collector, the oxide that collection liquid surface is formed is insulator,
Battery core internal resistance can be caused to increase, because drying temperature is generally greater than solvent boiling point, such drying mode heating not only takes very much,
And it consumes energy very much.
Invention content
In consideration of it, the present invention provides a kind of electrodes of lithium-ion batteries that can effectively improve pole piece quality and yields
Low temperature drying method.
The present invention provides a kind of low temperature drying methods of electrodes of lithium-ion batteries, include the following steps：
1) battery pole piece semi-finished product by electrode slurry coating on a current collector, are formed；
2) battery pole piece semi-finished product are freezed；
3) after electrode slurry freezing curing, battery pole piece semi-finished product is sent into vacuum refrigeration environment and are preserved；
4) battery pole piece semi-finished product are taken out from vacuum refrigeration environment, completes drying.
Further, above-mentioned battery pole piece semi-finished product are freezed in freezer box.
Further, above-mentioned battery pole piece semi-finished product complete freezing under 0 DEG C to -180 DEG C of temperature condition.
Further, above-mentioned battery pole piece semi-finished product freeze 0.1-1 hours.
Further, above-mentioned vacuum environment is realized by vacuum pump.
Further, the vacuum degree of above-mentioned vacuum environment is -0.1bar to -1bar.
Further, above-mentioned battery pole piece semi-finished product preserve 1-50 hours under vacuum conditions.
Further, above-mentioned electrode slurry is coated on a current collector by coating apparatus.
Further, above-mentioned coating apparatus is transfer type coating machine.
Further, above-mentioned collector is metal foil.
Electrode slurry is coated in collection by a kind of low temperature drying method of electrodes of lithium-ion batteries provided by the present invention first
On fluid, then the collector of load electrode slurry is quickly put under closed low temperature environment, and electrode slurry is sent out at low ambient temperatures
Raw solidification curing after electrode slurry solidification curing, vacuumizes low temperature environment preservation, is reduced according to pressure, boiling point declines
Physical principle, as long as gas pressure is under triple point pressure in environment, the solvent in material then can be without liquid phase and straight
Distillation is connect as vapour phase；Around this principle, under appropriate vacuum environment, solid solvents is converted into steam and are removed,
So as to which pole piece be made to obtain drying；
Thus, using above-mentioned principle, the present invention mainly has the following advantages compared to the prior art：
1) pole piece bubble because caused by evaporation of the solvent is rapid is efficiently reduced, so as to prevent because being made during bubbles burst
Into pole piece defect and phenomena such as battery micro-short circuit；
2) since solid content is support by the solid solvent molecule on its seat, so that pole piece in drying process
Coating structure will not be destroyed；
3) when solid solvent distils, hole can be left, the lithium ion for after provides abundant migrating channels, convenient for lithium
Ion passes through, so as to using the internal resistance for reducing battery, improve battery capacity, extend battery uses duration, solves to pass
Unite drying mode in time consumption and energy consumption the problem of.
In addition, a kind of low temperature drying method of electrodes of lithium-ion batteries provided in present embodiment is also especially suitable
It closes and implements, such as minimum to -50 DEG C of northern China winter temperature in low temperature environment, which fully meets this patent requirement
Environment temperature produces lithium ion battery negative electrode using the northern area of China winter severe cold temperature, and method is simple, saves energy consumption
Cost is suitable for volume production.
Specific embodiment
The exemplary embodiment of the disclosure is described in more detail below.Although show the exemplary implementation of the disclosure
Example, it being understood, however, that may be realized in various forms the disclosure without should be limited by embodiments set forth here.On the contrary,
These embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can completely be communicated to the scope of the present disclosure
Those skilled in the art.
Embodiment one：
Prepare electrode slurry：
Electrode slurry can specifically include active material, conductive agent, levelling agent, solvent and high molecular polymer, will be active
The slurry to be formed is mixed evenly in substance, conductive agent, levelling agent and binding agent and solvent；Active material is native graphite, people
Make one or more compounds in graphite, carbonaceous mesophase spherules, silica flour, silicon-carbon compound, carbon material, lithium-containing compound；
Conductive agent is carbon nanotube, carbon black, graphene, graphite powder, carbon fiber, carbon material, one or more in metal powder answer
Close object；Levelling agent is surfactant, polyacrylic acid, carboxymethyl cellulose, surfactant, acrylic compounds, organic
One or more compounds in silicon class compound and fluorocarbons class.
In the present embodiment one, specially：Take 94 parts of natural graphite negative electrode materials, 8 parts of superconductive carbon blacks (SP), 6 parts of bondings
Agent and 140 parts of solvents (water), which are put into refiner and are stirred, is mixed into uniform electrode slurry；
Start drying steps：
1) it is carried out using transfer type coating machine on the copper foil coated in 10 μ m-thicks, 250 μm of the slurry thickness of coating is set；Its
In, painting method is specifically as follows one or more in squash type coating, transfer type coating, nick coating, spin coating or spraying
Combination；
2) pole piece coated (battery pole piece semi-finished product) is lain on the stainless-steel sheet of flat polish, together with stainless steel
Steel plate is put into closed case, and spin manifold temperature is shifted to an earlier date 30 minutes is arranged to -20 DEG C；
3) after 30 minutes refrigerating process, coating (electrode slurry) solidification starts vacuum pump, setting vacuum degree -0.8bar
(atmospheric pressure 1bar), while keep -20 DEG C of spin manifold temperature；
4) it preserves after 24 hours, takes out battery pole piece semi-finished product from vacuum environment, complete drying.
| Embodiment | Cryogenic temperature | Cooling time | Vacuum degree | The vacuum holding time |
| 2 | -130 | 30 minutes | -0.8bar | 24 hours |
| 3 | -20 | 60 minutes | -0.8bar | 24 hours |
| 4 | -20 | 30 minutes | -0.5bar | 24 hours |
| 5 | -20 | 30 minutes | -0.8bar | 40 hours |
Comparative example：
Prepare the electrode slurry described in embodiment one.
Start drying steps：
1) it is carried out using transfer type coating machine on the copper foil coated in 10 μ m-thicks, 250 μm of the slurry thickness of coating is set；
2) pole piece coated (battery pole piece semi-finished product) is lain on the stainless-steel sheet of flat polish, together with stainless steel
Steel plate is put into the drying of high temperature babinet, and spin manifold temperature is shifted to an earlier date 30 minutes and is arranged to 120 DEG C.
For verification technique effect, the data that the various embodiments described above go out embodied in specific experiment are enclosed herein, specifically
It is as shown in the table.
To sum up, the low temperature drying method of a kind of electrodes of lithium-ion batteries provided in present embodiment first will
Electrode slurry coats on a current collector, and then the collector of load electrode slurry is quickly put under closed low temperature environment, electrode slurry
Solidification curing occurs at low ambient temperatures for material, after electrode slurry solidification curing, preservation is vacuumized to low temperature environment, according to pressure
The physical principle that power reduces, boiling point declines, as long as gas pressure is under triple point pressure in environment, the solvent in material then may be used
It directly distils as vapour phase without liquid phase；Around this principle, under appropriate vacuum environment, solid solvents are directly converted
It is removed for steam, so as to which pole piece be made to obtain drying；
Thus, using above-mentioned principle, a kind of low temperature of electrodes of lithium-ion batteries provided in present embodiment
Drying means mainly has the following advantages compared to the prior art：
1) pole piece bubble because caused by evaporation of the solvent is rapid is efficiently reduced, so as to prevent because being made during bubbles burst
Into pole piece defect and phenomena such as battery micro-short circuit；
2) since solid content is support by the solid solvent molecule on its seat, so that pole piece in drying process
Coating structure will not be destroyed；
3) when solid solvent distils, hole can be left, the lithium ion for after provides abundant migrating channels, convenient for lithium
Ion passes through, so as to using the internal resistance for reducing battery, improve battery capacity, extend battery uses duration, solves to pass
Unite drying mode in time consumption and energy consumption the problem of.
In addition, a kind of low temperature drying method of electrodes of lithium-ion batteries provided in present embodiment is also especially suitable
It closes and implements, such as minimum to -50 DEG C of northern China winter temperature in low temperature environment, which fully meets this patent requirement
Environment temperature produces lithium ion battery negative electrode using the northern area of China winter severe cold temperature, and method is simple, saves energy consumption
Cost is suitable for volume production.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of low temperature drying method of electrodes of lithium-ion batteries, which is characterized in that include the following steps：
1) battery pole piece semi-finished product by electrode slurry coating on a current collector, are formed；
2) the battery pole piece semi-finished product are freezed；
3) after electrode slurry freezing curing, the battery pole piece semi-finished product is sent into vacuum refrigeration environment and are preserved；
4) the battery pole piece semi-finished product are taken out from the vacuum refrigeration environment, completes drying.
A kind of 2. low temperature drying method of electrodes of lithium-ion batteries according to claim 1, which is characterized in that the battery
Pole piece semi-finished product are freezed in freezer box.
3. the low temperature drying method of a kind of electrodes of lithium-ion batteries according to claim 1 or 2, which is characterized in that described
Battery pole piece semi-finished product are being freezed less than 0 DEG C to completion under -180 DEG C of temperature conditions.
4. the low temperature drying method of a kind of electrodes of lithium-ion batteries according to claim 1 or 2, which is characterized in that described
Battery pole piece semi-finished product freeze 0.1-1 hours.
A kind of 5. low temperature drying method of electrodes of lithium-ion batteries according to claim 1, which is characterized in that the vacuum
Environment is realized by vacuum pump.
6. a kind of low temperature drying method of electrodes of lithium-ion batteries according to claim 1 or 5, which is characterized in that described
The vacuum degree of vacuum environment is -0.1bar to -1bar.
7. a kind of low temperature drying method of electrodes of lithium-ion batteries according to claim 1 or 5, which is characterized in that described
Battery pole piece semi-finished product preserve 1-50 hours under the vacuum environment.
A kind of 8. low temperature drying method of electrodes of lithium-ion batteries according to claim 1, which is characterized in that the electrode
Slurry is coated on by coating apparatus on the collector.
A kind of 9. low temperature drying method of electrodes of lithium-ion batteries according to claim 8, which is characterized in that the coating
Equipment is transfer type coating machine.
A kind of 10. low temperature drying method of electrodes of lithium-ion batteries according to claim 1, which is characterized in that the collection
Fluid is metal foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810015869.1A CN108258187A (en) | 2018-01-08 | 2018-01-08 | A kind of low temperature drying method of electrodes of lithium-ion batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810015869.1A CN108258187A (en) | 2018-01-08 | 2018-01-08 | A kind of low temperature drying method of electrodes of lithium-ion batteries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108258187A true CN108258187A (en) | 2018-07-06 |
Family
ID=62726139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810015869.1A Pending CN108258187A (en) | 2018-01-08 | 2018-01-08 | A kind of low temperature drying method of electrodes of lithium-ion batteries |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108258187A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111420853A (en) * | 2020-03-27 | 2020-07-17 | 天目湖先进储能技术研究院有限公司 | Pole piece drying method for inhibiting adhesive migration, pole piece and battery |
| CN113451551A (en) * | 2021-07-05 | 2021-09-28 | 焦作伴侣纳米材料工程有限公司 | Modification method and application of lithium ion battery electrode material |
| WO2022110592A1 (en) * | 2020-11-25 | 2022-06-02 | 中国科学院上海高等研究院 | Electrode freeze-coating equipment and manufacturing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399329A (en) * | 2007-09-26 | 2009-04-01 | 北京化工大学 | Positive pole plate of lithium-sulfur cell and manufacturing method thereof |
| CN107546368A (en) * | 2017-09-05 | 2018-01-05 | 沈阳理工大学 | Nickle cobalt lithium manganate ternary based lithium-ion battery positive plate preparation method |
-
2018
- 2018-01-08 CN CN201810015869.1A patent/CN108258187A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399329A (en) * | 2007-09-26 | 2009-04-01 | 北京化工大学 | Positive pole plate of lithium-sulfur cell and manufacturing method thereof |
| CN107546368A (en) * | 2017-09-05 | 2018-01-05 | 沈阳理工大学 | Nickle cobalt lithium manganate ternary based lithium-ion battery positive plate preparation method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111420853A (en) * | 2020-03-27 | 2020-07-17 | 天目湖先进储能技术研究院有限公司 | Pole piece drying method for inhibiting adhesive migration, pole piece and battery |
| WO2022110592A1 (en) * | 2020-11-25 | 2022-06-02 | 中国科学院上海高等研究院 | Electrode freeze-coating equipment and manufacturing method |
| CN113451551A (en) * | 2021-07-05 | 2021-09-28 | 焦作伴侣纳米材料工程有限公司 | Modification method and application of lithium ion battery electrode material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105932245B (en) | A kind of high compacted density silicon-carbon cathode material and its preparation method and application | |
| CN108258187A (en) | A kind of low temperature drying method of electrodes of lithium-ion batteries | |
| CN110085813B (en) | Hard carbon composite material and preparation method thereof | |
| CN105489866B (en) | A kind of lithium ion battery and its anode material and preparation method | |
| CN104538607A (en) | Preparation method of silicon-carbon negative electrode material for lithium ion battery | |
| CN105261733A (en) | Preparation method of nano silicon-based/carbon composite material | |
| WO2016202164A1 (en) | Preparation method for preparing composite carbon/graphite/tin negative-electrode material | |
| CN111725504A (en) | Silicon-carbon negative electrode material for lithium ion battery and preparation method thereof | |
| WO2024000885A1 (en) | Preparation method for sodium ion battery porous hard carbon material, and product and use thereof | |
| CN104362330A (en) | LiNixCo1-x-yMnyO2 cathode material coated with boron-lithium composite oxide and preparation method thereof | |
| CN116654895A (en) | Phosphorus-tin co-doped hard carbon negative electrode material and preparation method thereof | |
| CN114883544A (en) | Preparation method of long-cycle lithium ion battery graphite negative electrode material | |
| CN108002356A (en) | δ-VOPO4Ultrathin nanometer piece and its controllable method for preparing and application | |
| CN108258186A (en) | A kind of preparation method of electrodes of lithium-ion batteries | |
| CN110265732B (en) | Constant-temperature-regulated lithium battery manufacturing process and lithium battery | |
| CN115849368A (en) | Phosphorus-boron modified carbon-coated artificial graphite negative electrode material, and preparation method and application thereof | |
| CN112490395A (en) | Drying method of lithium ion battery pole piece and drying device used by drying method | |
| CN110379997B (en) | Coating process for positive and negative pole pieces of lithium ion battery | |
| CN112133967A (en) | All-solid-state sulfur lithium battery | |
| CN113683072A (en) | Preparation method and application of spherical lithium iron phosphate cathode material | |
| CN113036137A (en) | Lithium ion battery cathode material and preparation method and application thereof | |
| CN106299323A (en) | A kind of hollow coated Si carbon negative pole material preparation method | |
| CN112830483A (en) | Preparation method of high-rate graphite negative electrode material | |
| CN112103475A (en) | Method for preparing lithium battery electrode by using supercritical current collector and electrode | |
| CN103208613B (en) | Production method of anode plate in lithium ion batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180706 |
|
| RJ01 | Rejection of invention patent application after publication |