CN112467084A - Lithium ion battery negative pole piece lithium supplementing device and lithium supplementing method thereof - Google Patents
Lithium ion battery negative pole piece lithium supplementing device and lithium supplementing method thereof Download PDFInfo
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- CN112467084A CN112467084A CN202011318267.7A CN202011318267A CN112467084A CN 112467084 A CN112467084 A CN 112467084A CN 202011318267 A CN202011318267 A CN 202011318267A CN 112467084 A CN112467084 A CN 112467084A
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- lithium
- ion battery
- concave roller
- lithium ion
- supplementing
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 101
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 43
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 28
- 229910052751 metal Inorganic materials 0.000 claims abstract description 43
- 239000002184 metal Substances 0.000 claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 238000002844 melting Methods 0.000 claims abstract description 3
- 230000008018 melting Effects 0.000 claims abstract description 3
- 238000005192 partition Methods 0.000 claims abstract description 3
- 230000001276 controlling effect Effects 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 238000007790 scraping Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 3
- WHXSMMKQMYFTQS-IGMARMGPSA-N lithium-7 atom Chemical compound [7Li] WHXSMMKQMYFTQS-IGMARMGPSA-N 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 230000009469 supplementation Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009700 powder processing Methods 0.000 description 1
Images
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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
-
- 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
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
-
- 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
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
- H01M4/381—Alkaline or alkaline earth metals elements
- H01M4/382—Lithium
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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 provides a lithium supplementing device for a negative pole piece of a lithium ion battery. Lithium ion battery negative pole piece mends lithium device includes inert atmosphere room, the indoor partition of inert atmosphere is equipped with the cooling chamber to and be used for holding the room that holds of metal liquefaction pond, it is equipped with in the room to hold the metal liquefaction pond, the cavity is acceptd for being used for acceping the melting metal lithium to the inner chamber of metal liquefaction pond, the top of acceping the cavity is equipped with little concave roller and scraper, the scraper is located the lateral part of little concave roller, the scraper with the angle between the little concave roller is 80 to 100 degrees, the both sides of little concave roller are equipped with two live-rollers. The lithium supplementing device for the negative pole piece of the lithium ion battery is simple in structure, can solve the problems that molten lithium is not good in surface wettability with a base material and a micro-concave roller, the molten lithium is agglomerated on a coating roller or the base material, the lithium supplementing coating is not uniform, and the performance of the lithium ion battery is affected, is good in lithium supplementing consistency, and greatly improves the product goodness and the production efficiency.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium supplementing device and a lithium supplementing method for a negative pole piece of a lithium ion battery.
Background
The lithium ion battery has the advantages of high working voltage, high energy density, long cycle life, no memory effect and the like, so the lithium ion battery is widely applied to the aspects of notebook computers, digital products, mobile communication and the like.
At present, the lithium ion battery has a phenomenon that: that is, in the first charge-discharge cycle of the lithium ion battery, the electrode material reacts with the Electrolyte at the Solid-liquid Interface to form a passivation layer covering the surface of the electrode material, which is called a Solid Electrolyte Interface (Solid Electrolyte Interface), or SEI film for short. Since a large amount of lithium ions are consumed by forming the SEI film, the first charge-discharge irreversible capacity is increased, and the charge-discharge coulombic efficiency of the electrode material is reduced.
In order to solve the above problems, a method for supplementing lithium to a negative electrode of a lithium ion battery has been proposed to compensate for a large amount of lithium ions consumed by the formation of an SEI film. CN207038626U discloses a lithium supplementing device and a lithium supplementing method for a negative electrode plate of a lithium ion battery, in which a band-shaped lithium source is pressed on the negative electrode plate by a calendar to form a layer of lithium film. CN104916814A discloses a lithium powder processing system of lithium ion battery pole piece. However, the lithium powder used in the process has strong activity, is easy to react with moisture and oxygen in the air, has serious safety problems, is light in weight, is easy to float, and is easy to be inhaled by human bodies to be harmful to human bodies. CN 109346664A discloses a device and method for supplementing lithium to a battery pole piece with molten lithium, which can simplify the process of lithium supplementation, but when the temperature is lower than 500 ℃, the wettability of the molten metal lithium with a substrate and a dimpled roller is poor due to the large surface tension of the molten metal lithium, and the molten metal lithium forms aggregates on the roller, which results in uneven lithium supplementation coating.
Disclosure of Invention
Therefore, in order to solve the above problems, it is necessary to provide a lithium supplementing device for a lithium ion battery negative electrode plate and a lithium supplementing method thereof, where the lithium supplementing device has a simple process structure, and can solve the problems that molten lithium is not well wetted with a substrate and a micro-concave roller, so that the molten lithium is agglomerated on a coating roller or the substrate, the coating of the lithium is uneven, and the performance of the lithium ion battery is affected. The method has good consistency of lithium supplement, and the product quality rate and the production efficiency are greatly improved.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a lithium ion battery negative pole piece mends lithium device, lithium ion battery negative pole piece mends lithium device includes inert atmosphere room, inert atmosphere indoor partition is equipped with the cooling chamber to and be used for holding the room that holds of metal liquefaction pond, it is equipped with in the room to hold the metal liquefaction pond, the cavity is acceptd for being used for acceping the lithium of molten metal to the inner chamber of metal liquefaction pond, the top of acceping the cavity is equipped with little concave roller and scraper, the scraper is located the lateral part of little concave roller, the scraper with angle between the little concave roller is 80 to 100 degrees, the both sides of little concave roller are equipped with two live rollers.
A lithium supplementing method for the lithium supplementing device for the negative electrode plate of the lithium ion battery, which comprises the following steps:
the method comprises the following steps: controlling the temperature of the metal liquefaction pool to melt the metal lithium to form molten metal lithium liquid;
step two: scraping redundant slurry of the micro-concave roller by regulating and controlling a scraper;
step three: coating molten metal lithium on the surface of the negative pole piece by using the micro-concave roller;
step four: and 4, the lithium supplement electrode piece obtained in the step three enters a cooling chamber for natural cooling.
Further, the temperature of the metal liquefaction pool is above 500 ℃.
Further, the temperature of the micro concave roller is more than 500 ℃.
Furthermore, the diameter of the micro-concave roller is 20-50 mm.
Furthermore, the number of the lines is 100-200, and the rotating speed ratio of the micro concave roller is 60% -200%.
Further, the angle between the scraper and the micro concave roller is 80-100 degrees.
Further, the temperature of the cooling chamber is 20-30 ℃.
Compared with the prior art, the lithium supplementing device and the lithium supplementing method for the lithium ion battery negative pole piece have the following advantages: the lithium supplementing device is simple in process structure, can solve the problems that molten lithium is not good in surface wettability with a base material and a micro-concave roller, the molten lithium is agglomerated on a coating roller or the base material, the lithium supplementing coating is not uniform, the performance of a lithium ion battery is affected, the lithium supplementing consistency is good, and the product goodness and the production efficiency are greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a lithium supplement device for a negative electrode plate of a lithium ion battery of the present invention.
The reference numbers in the drawings are as follows:
the device comprises a metal liquefaction pool 1, a micro concave roller 2, a rotating roller 3, a scraper 4, a cooling chamber 5, an inert atmosphere chamber 6 and molten metal lithium 7.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the invention provides a lithium supplement device for a lithium ion battery negative electrode piece, which comprises an inert atmosphere chamber 6, wherein a cooling chamber 5 and a containing chamber for containing a metal liquefaction tank 1 are arranged in the inert atmosphere chamber, the metal liquefaction tank is arranged in the containing chamber, an inner cavity of the metal liquefaction tank is a containing cavity for containing molten metal lithium 7, a micro-concave roller 2 and a scraper 4 are arranged above the containing cavity, the scraper is arranged on the side part of the micro-concave roller, the angle between the scraper and the micro-concave roller is 80-100 degrees, and two rotating rollers 3 are arranged on two sides of the micro-concave roller.
In this embodiment, the angle between the doctor blade and the micro-concave roller is 90 degrees.
The invention also provides a lithium supplementing method of the lithium supplementing device for the lithium ion battery negative pole piece, which comprises the following steps:
the method comprises the following steps: controlling the temperature of the metal liquefaction pool to melt the metal lithium to form molten metal lithium liquid;
step two: scraping redundant slurry of the micro-concave roller by regulating and controlling a scraper;
step three: coating molten metal lithium on the surface of the negative pole piece by using a micro-concave roller;
step four: and naturally cooling the lithium supplement electrode piece obtained in the third step.
The temperature of the metal liquefaction pool and the micro concave roller is more than 500 ℃, and the temperature of the scraper is more than 100 ℃.
It should be noted that, when the temperature is lower than 500 ℃, the surface tension of the molten metal lithium is large, so that the lithium metal lithium has poor wettability with the substrate and the micro-concave roller, and the molten metal lithium forms agglomerates on the roller, so that the lithium supplement coating is not uniform.
The diameter of the micro-concave roller is 20-50 mm, the depth of the groove is 10-50 microns, the number of lines is 100-200, the rotating speed ratio of the micro-concave roller is 60% -200%, and the angle between a scraper and the micro-concave roller is 80-100 degrees.
It needs to be noted that the rotation speed ratio of the micro-concave roller is the ratio of the surface linear speed of the roller to the linear speed of the material; the thickness of the coated lithium layer is mainly controlled by the groove depth of the micro-concave roller, the number of lines and the rotating speed ratio of the micro-concave roller, and the thickness of the metal lithium layer is 1-5 mu m as the best.
The temperature of the cooling chamber is 20-30 ℃.
Specifically, the first step: controlling the temperature of the metal liquefaction pool to be 550 ℃, melting the metal lithium to form molten metal lithium liquid, and increasing the surface tension of the molten lithium by increasing the temperature of the molten lithium, so as to increase the wettability of the molten lithium with the micro-concave roller and the base material and prevent the agglomeration of the molten lithium;
step two: controlling the angle between the scraper and the micro-concave roller to be 90 ℃, and scraping redundant slurry on the micro-concave roller;
step three: coating molten metal lithium on the surface of a negative pole piece by using a micro-concave roller with the roller diameter of 30mm and the groove depth of 20 microns and controlling the rotating speed ratio of the micro-concave roller to be 100%;
step four: and cooling the lithium supplement electrode piece obtained in the third step in a cooling chamber at 25 ℃. Finally, the thickness of the lithium foil on the surface of the substrate was measured to be 4 μm.
According to the lithium ion battery negative pole piece lithium supplementing device and the lithium supplementing method thereof, the process structure of the lithium supplementing device is simple, the problems that molten lithium is not well wetted with the surface of the base material and the micro-concave roller, the molten lithium is agglomerated on the coating roller or the base material, the lithium supplementing coating is not uniform, and the performance of a lithium ion battery is affected can be solved, the lithium supplementing consistency is good, and the product quality rate and the production efficiency are greatly improved.
The above examples only express embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The utility model provides a lithium ion battery negative pole piece mends lithium device which characterized in that: lithium ion battery negative pole piece mends lithium device includes inert atmosphere room, the indoor partition of inert atmosphere is equipped with the cooling chamber to and be used for holding the room that holds of metal liquefaction pond, it is equipped with in the room to hold the metal liquefaction pond, the cavity is acceptd for being used for acceping the melting metal lithium in the inner chamber of metal liquefaction pond, the top of acceping the cavity is equipped with little concave roller and scraper, the scraper is located the lateral part of little concave roller, the both sides of little concave roller are equipped with two live rollers.
2. A method for lithium replenishment of the lithium replenishment device of the lithium ion battery negative electrode sheet of any one of the preceding claims 1-2, the method comprising the steps of:
the method comprises the following steps: controlling the temperature of the metal liquefaction pool to melt the metal lithium to form molten metal lithium liquid;
step two: scraping redundant slurry of the micro-concave roller by regulating and controlling a scraper;
step three: coating molten metal lithium on the surface of the negative pole piece by using the micro-concave roller;
step four: and 4, the lithium supplement electrode piece obtained in the step three enters a cooling chamber for natural cooling.
3. The lithium supplementing method of the lithium supplementing device for the lithium ion battery negative electrode piece according to claim 2, characterized in that: the temperature of the metal liquefaction pool is above 500 ℃.
4. The lithium supplementing method of the lithium supplementing device for the lithium ion battery negative electrode piece according to claim 2, characterized in that: the temperature of the micro-concave roller is above 500 ℃.
5. The lithium supplementing method of the lithium supplementing device for the lithium ion battery negative electrode piece according to claim 2, characterized in that: the diameter of the micro-concave roller is 20-50 mm.
6. The lithium supplementing method of the lithium supplementing device for the lithium ion battery negative electrode piece according to claim 2, characterized in that: the number of the lines is 100-200, and the rotating speed ratio of the micro-concave roller is 60-200%.
7. The lithium supplementing method of the lithium supplementing device for the lithium ion battery negative electrode piece according to claim 2, characterized in that: the angle between the scraper and the micro concave roller is 80-100 degrees.
8. The lithium supplementing method of the lithium supplementing device for the lithium ion battery negative electrode piece according to claim 2, characterized in that: the temperature of the cooling chamber is 20-30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011318267.7A CN112467084A (en) | 2020-11-23 | 2020-11-23 | Lithium ion battery negative pole piece lithium supplementing device and lithium supplementing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011318267.7A CN112467084A (en) | 2020-11-23 | 2020-11-23 | Lithium ion battery negative pole piece lithium supplementing device and lithium supplementing method thereof |
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| CN112467084A true CN112467084A (en) | 2021-03-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422007A (en) * | 2021-05-27 | 2021-09-21 | 湖南立方新能源科技有限责任公司 | Method for supplementing lithium to negative electrode, lithium supplementing negative plate and lithium battery |
| CN113964295A (en) * | 2021-10-19 | 2022-01-21 | 远景动力技术(江苏)有限公司 | Lithium supplementing device and method for lithium ion battery negative pole piece |
| CN113964374A (en) * | 2021-10-19 | 2022-01-21 | 远景动力技术(江苏)有限公司 | Pre-lithiation device and pre-lithiation method for pole piece |
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| CN113964374A (en) * | 2021-10-19 | 2022-01-21 | 远景动力技术(江苏)有限公司 | Pre-lithiation device and pre-lithiation method for pole piece |
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