CN115347256A - Manufacturing process of lithium-supplement negative plate of battery, lithium-supplement negative plate and battery - Google Patents
Manufacturing process of lithium-supplement negative plate of battery, lithium-supplement negative plate and battery Download PDFInfo
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- CN115347256A CN115347256A CN202211024967.4A CN202211024967A CN115347256A CN 115347256 A CN115347256 A CN 115347256A CN 202211024967 A CN202211024967 A CN 202211024967A CN 115347256 A CN115347256 A CN 115347256A
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- lithium
- supplement
- battery
- negative electrode
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- 239000013589 supplement Substances 0.000 title claims abstract description 76
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 78
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 78
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 238000000576 coating method Methods 0.000 claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000003960 organic solvent Substances 0.000 claims abstract description 12
- 239000007773 negative electrode material Substances 0.000 claims abstract description 11
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002033 PVDF binder Substances 0.000 claims abstract description 9
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000007765 extrusion coating Methods 0.000 claims description 3
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001947 lithium oxide Inorganic materials 0.000 claims description 3
- GLNWILHOFOBOFD-UHFFFAOYSA-N lithium sulfide Chemical compound [Li+].[Li+].[S-2] GLNWILHOFOBOFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract description 9
- 238000003825 pressing Methods 0.000 abstract description 7
- 239000011149 active material Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 239000003792 electrolyte Substances 0.000 description 3
- -1 N-diethylformamide Chemical compound 0.000 description 2
- 239000006183 anode active material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 230000037303 wrinkles Effects 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
-
- 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
-
- 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
-
- 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 embodiment of the invention discloses a manufacturing process of a lithium-supplement negative plate of a battery, the lithium-supplement negative plate and the battery, which are used for solving the technical problems that the lithium-supplement effect is poor and the consistency of a bare cell is influenced because the lithium plate is mostly pressed on the negative plate in the conventional manufacturing mode of the lithium-supplement negative plate and the pressing is uneven easily generated in the pressing process. The embodiment of the invention comprises the following steps: s1, uniformly stirring lithium powder, polyvinylidene fluoride, ethylene carbonate and an organic solvent to obtain lithium supplement slurry; and S2, coating the lithium supplement slurry on a negative electrode active material layer of the negative plate, and drying to form a lithium supplement layer, so as to obtain the lithium supplement negative plate. In this embodiment, to mend lithium thick liquids and through the mode coating on the negative pole active material layer of coating to the negative pole piece for mend lithium thick liquids and can evenly cover on the negative pole active material layer, guaranteed to mend the uniformity of lithium thick liquids on the negative pole piece, mend lithium effect better.
Description
Technical Field
The invention relates to the technical field of battery lithium supplement, in particular to a battery lithium supplement negative plate manufacturing process, a lithium supplement negative plate and a battery.
Background
With the use of high-power and high-energy devices such as power automobiles and the like, higher and higher requirements are provided for the energy density of lithium ion batteries. In the negative electrode sheet, a part of lithium is consumed due to the formation of a solid electrolyte film (SEI film) during the first charge of the battery, thereby causing the loss of lithium as a positive electrode material, thereby reducing the capacity of the battery, resulting in the decrease of the first efficiency.
Research personnel consider usually to mend lithium to the negative pole, and concrete operation mode is, directly the pressfitting on the negative pole piece through the mode of pressfitting with the lithium piece, the inhomogeneous condition of pressfitting is produced easily to foretell pressfitting in-process to it is relatively poor to make and mend the lithium effect, influences the technical problem of naked electric core uniformity.
Therefore, it is an important subject to be studied by those skilled in the art to find a solution to the above-mentioned technical problem.
Disclosure of Invention
The embodiment of the invention discloses a manufacturing process of a lithium-supplement negative plate of a battery, the lithium-supplement negative plate and the battery, which are used for solving the technical problems that the lithium-supplement effect is poor and the consistency of a bare cell is influenced because the lithium plate is mostly pressed on the negative plate in the conventional manufacturing mode of the lithium-supplement negative plate and the pressing is uneven easily generated in the pressing process.
The embodiment of the invention provides a manufacturing process of a lithium-supplement negative plate of a battery, which comprises the following steps:
s1, uniformly stirring lithium powder, polyvinylidene fluoride, ethylene carbonate and an organic solvent to obtain lithium supplement slurry;
and S2, coating the lithium supplement slurry on a negative electrode active material layer of the negative electrode plate, and drying to form a lithium supplement layer, so as to obtain the lithium supplement negative electrode plate.
Optionally, the lithium powder is metallic lithium powder or lithium oxide or lithium sulfide.
Optionally, the organic solvent comprises one of N-methylpyrrolidone, N-dimethylformamide, N-dimethylacetamide, N-diethylformamide, dimethylsulfoxide.
Optionally, the coating manner in step S2 is an extrusion coating manner, a transfer coating manner, or a spraying manner.
Optionally, the negative active material layer is a graphite layer.
Optionally, the step S1 specifically includes:
uniformly stirring lithium powder, polyvinylidene fluoride, ethylene carbonate and an organic solvent under a protective atmosphere to obtain lithium supplement slurry;
the protective atmosphere is argon or nitrogen.
The embodiment of the invention provides a lithium-supplement negative plate which is manufactured by the manufacturing process of the lithium-supplement negative plate.
The embodiment of the invention provides a battery, which comprises the lithium-supplement negative plate.
According to the technical scheme, the embodiment of the invention has the following advantages:
in this embodiment, to mend lithium thick liquids and through the mode coating on the negative pole active material layer of coating to the negative pole piece for mend lithium thick liquids and can evenly cover on the negative pole active material layer, guaranteed to mend the uniformity of lithium thick liquids on the negative pole piece, mend lithium effect better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a process for manufacturing a lithium-supplement negative electrode plate of a battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a lithium-supplementing negative electrode sheet of a battery provided in an embodiment of the present invention;
illustration of the drawings: a current collector 1; an anode active material layer 2; and a lithium supplement layer 3.
Detailed Description
The embodiment of the invention discloses a manufacturing process of a lithium-supplement negative plate of a battery, the lithium-supplement negative plate and the battery, which are used for solving the technical problems that the lithium-supplement effect is poor and the consistency of a bare cell is influenced because the lithium plate is mostly pressed on the negative plate in the conventional manufacturing mode of the lithium-supplement negative plate and the pressing is uneven easily generated in the pressing process.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1 and fig. 2, a manufacturing process of a lithium-supplement negative electrode plate for a battery according to an embodiment of the present invention includes the following steps:
s1, uniformly stirring lithium powder, polyvinylidene fluoride, ethylene carbonate and an organic solvent to obtain lithium supplement slurry;
and S2, coating the lithium supplement slurry on the negative electrode active material layer 2 of the negative electrode plate, and drying to form a lithium supplement layer 3, so as to obtain the lithium supplement negative electrode plate.
It should be noted that, in the above manufacturing process, a designer can design a preset coating density of the lithium supplement slurry, so that the energy density of the battery can be maximized on the premise of meeting the performance requirement.
In this embodiment, to mend lithium thick liquids and to coat on the negative pole active material layer 2 of negative pole piece through the mode of coating for mend lithium thick liquids and can evenly cover on negative pole active material layer 2, guaranteed to mend the uniformity of lithium thick liquids on the negative pole piece, mend lithium effect better.
Further, the lithium supplement slurry in this embodiment contains ethylene carbonate, and after the electrolyte is injected into the case of the battery, the lithium supplement layer 3 on the negative electrode sheet contacts with the electrolyte, so as to increase the content of ethylene carbonate in the electrolyte.
Furthermore, the lithium supplement slurry in the embodiment has polyvinylidene fluoride, and when lithium of the lithium supplement layer 3 is consumed, the polyvinylidene fluoride can be attached to the diaphragm to improve the wrinkle problem of the naked battery cell interface.
Further, the lithium powder in this embodiment is metallic lithium powder or lithium oxide or lithium sulfide.
It should be noted that, a designer may select a suitable type of lithium powder according to actual needs, and the embodiment does not limit the specific type of lithium powder.
Further, the organic solvent in this embodiment includes one of N-methylpyrrolidone, N-dimethylformamide, N-dimethylacetamide, N-diethylformamide, and dimethylsulfoxide.
It should be noted that, the designer can select a suitable organic solvent according to the actual situation, and the specific type of the organic solvent is not limited in this embodiment.
Further, the coating manner in the step S2 is an extrusion coating manner, a transfer coating manner or a spray coating manner.
It should be noted that, the coating manner described above enables the lithium supplement slurry to uniformly cover the negative electrode active material layer 2, so that the consistency of the lithium supplement slurry on the negative electrode sheet is ensured, and the lithium supplement effect is better.
Further, the anode active material layer 2 in the present embodiment is a graphite layer.
It is to be noted that the negative electrode active material layer 2 in the present embodiment is not limited to being a graphite layer, and the graphite layer may be an artificial graphite layer, a natural graphite layer, or the like.
Further, step S1 in this embodiment specifically includes:
uniformly stirring lithium powder, polyvinylidene fluoride, ethylene carbonate and an organic solvent under a protective atmosphere to obtain lithium supplement slurry;
the protective atmosphere is argon or nitrogen.
Example two
Referring to fig. 2, in the lithium supplement negative electrode sheet provided in the embodiment of the present invention, the lithium supplement negative electrode sheet is manufactured by the lithium supplement negative electrode sheet manufacturing process of the battery described in the first embodiment.
Further, the negative electrode sheet in the present embodiment specifically includes a current collector 1, a negative electrode active material layer 2 disposed on the current collector 1, and a lithium supplement layer 3 disposed on the negative electrode active material layer 2. The current collector 1 may be a copper foil layer.
It should be noted that, the lithium-supplement negative electrode sheet in this embodiment is manufactured by the manufacturing process of the first embodiment, and the lithium-supplement layer 3 on the lithium-supplement negative electrode sheet is formed by coating the lithium-supplement slurry on the negative active material layer 2 and drying the coating, so that the consistency of the lithium-supplement slurry on the negative electrode sheet is ensured, and the lithium-supplement effect of the lithium-supplement negative electrode sheet is better.
EXAMPLE III
Referring to fig. 2, a battery provided in an embodiment of the present invention includes the lithium supplement negative electrode sheet described in the second embodiment.
It should be noted that, in this embodiment, comparative analysis is made on the battery performance effect in this embodiment through the following four cases, specifically, a lithium iron phosphate 230Ah battery system is taken as an embodiment:
the scheme is as follows: batteries without any lithium replenishment design;
the second scheme is as follows: pressing a lithium piece to the negative plate to obtain a lithium-supplement negative plate, designing a lithium supplement amount of 17Ah for a battery with the lithium-supplement negative plate;
the third scheme is as follows: the battery in the third embodiment is designed to be 10Ah for lithium supplement;
the fourth case is listed: the battery in the third embodiment is designed to be supplemented with lithium by 17Ah;
table one: comparison of the parameters of each case
As can be seen from the above table, the number of cycles is larger for case four versus case two, demonstrating that the battery of example three has better lithium supplementation effect.
The above detailed descriptions of the manufacturing process of the lithium-supplemented negative electrode plate for the battery, the lithium-supplemented negative electrode plate and the battery provided by the present invention are provided, and a person skilled in the art may change the specific implementation manner and the application scope according to the ideas of the embodiments of the present invention.
Claims (8)
1. The manufacturing process of the lithium-supplement negative plate of the battery is characterized by comprising the following steps of:
s1, uniformly stirring lithium powder, polyvinylidene fluoride, ethylene carbonate and an organic solvent to obtain lithium supplement slurry;
and S2, coating the lithium supplement slurry on a negative electrode active material layer of the negative electrode plate, and drying to form a lithium supplement layer, so as to obtain the lithium supplement negative electrode plate.
2. The manufacturing process of the lithium-supplement negative electrode plate for the battery according to claim 1, wherein the lithium powder is metal lithium powder, lithium oxide or lithium sulfide.
3. The manufacturing process of the battery lithium-supplement negative electrode sheet according to claim 1, wherein the organic solvent comprises one of N-methylpyrrolidone, N-dimethylformamide, N-dimethylacetamide, N-diethylformamide and dimethyl sulfoxide.
4. The manufacturing process of the lithium-supplement negative electrode plate for the battery according to claim 1, wherein the coating manner in the step S2 is an extrusion coating manner, a transfer coating manner or a spraying manner.
5. The manufacturing process of the lithium-supplementing negative electrode plate for the battery according to claim 1, wherein the negative electrode active material layer is a graphite layer.
6. The manufacturing process of the lithium-supplement negative electrode plate for the battery according to claim 1, wherein the step S1 specifically comprises the following steps:
uniformly stirring lithium powder, polyvinylidene fluoride, ethylene carbonate and an organic solvent under a protective atmosphere to obtain lithium supplement slurry;
the protective atmosphere is argon or nitrogen.
7. The lithium-supplement negative plate is characterized by being manufactured by the manufacturing process of the lithium-supplement negative plate of the battery according to any one of claims 1 to 6.
8. A battery comprising the lithium-doped negative electrode sheet according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211024967.4A CN115347256A (en) | 2022-08-25 | 2022-08-25 | Manufacturing process of lithium-supplement negative plate of battery, lithium-supplement negative plate and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211024967.4A CN115347256A (en) | 2022-08-25 | 2022-08-25 | Manufacturing process of lithium-supplement negative plate of battery, lithium-supplement negative plate and battery |
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| Publication Number | Publication Date |
|---|---|
| CN115347256A true CN115347256A (en) | 2022-11-15 |
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| CN202211024967.4A Pending CN115347256A (en) | 2022-08-25 | 2022-08-25 | Manufacturing process of lithium-supplement negative plate of battery, lithium-supplement negative plate and battery |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993098A (en) * | 2015-06-10 | 2015-10-21 | 中航锂电（洛阳）有限公司 | Lithium supplement negative electrode piece, preparing method thereof, lithium-ion supercapacitor and lithium-ion battery |
| CN109713215A (en) * | 2018-12-25 | 2019-05-03 | 深圳市倍特力电池有限公司 | Mend lithium cathode sheet and preparation method thereof, lithium ion battery |
| CN111725487A (en) * | 2020-06-30 | 2020-09-29 | 昆山宝创新能源科技有限公司 | Lithium-supplementing negative plate and preparation method and application thereof |
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-
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- 2022-08-25 CN CN202211024967.4A patent/CN115347256A/en active Pending
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