CN212113927U - Lithium ion battery with pre-lithiated cathode - Google Patents
Lithium ion battery with pre-lithiated cathode Download PDFInfo
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- CN212113927U CN212113927U CN202021250260.1U CN202021250260U CN212113927U CN 212113927 U CN212113927 U CN 212113927U CN 202021250260 U CN202021250260 U CN 202021250260U CN 212113927 U CN212113927 U CN 212113927U
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
A negative prelithiated lithium ion battery is disclosed. The utility model discloses an in the embodiment, lithiated lithium ion battery in advance of negative pole, include: the battery cell is made of a positive plate, a negative plate and a diaphragm in a winding or laminating manner; a protective bag; a stopper frame; a housing; a cover plate; the battery cell is welded on the cover plate through the positive and negative lugs and is placed in the protective bag; the stop frame is placed in the protection bag and is contained in the shell, and the shell is welded and sealed with the cover plate. The utility model discloses lithiated lithium ion battery is in advance put to the negative pole, and battery energy density, battery effective capacity etc. are all than higher to the preparation method is simple and easy, and the cost is lower.
Description
Technical Field
The utility model relates to a lithium ion battery technical field especially relates to a lithium ion battery of negative pole lithiation in advance.
Background
At present, in the field of lithium ion batteries, the market has higher and higher requirements on the energy density of the lithium ion batteries, and high-capacity cathodes are further applied. However, when the lithium ion battery is charged and discharged for the first time or formed, the negative electrode undergoes redox reaction and volume expansion, and part of lithium ions are consumed, so that permanent loss of reversible lithium ions is caused, the energy of the lithium ion battery is reduced, the effective utilization rate of the positive electrode is low, and the energy of the lithium ion battery is lower and lower along with the fracture and regeneration cycles of the SEI film.
Currently, the prelithiation technology for lithium ion batteries is mainly divided into pole piece prelithiation, material prelithiation and slurry prelithiation. The pole piece is prelithiated, and a lithium source is generally added by calendering or electroplating on the prepared pole piece. The prelithiation of the material is generally performed by adding a lithium salt to the active material, pre-forming a passivation film on the surface of the material or increasing the lithium content. The slurry prelithiation generally uses a special solvent, and lithium powder or lithium salt is added to the slurry, in which a passivation film is formed on the surface of an active material by a reaction or an excessive lithium source is added.
The prior technical scheme and the prior prelithiation technical scheme have various modes, but each has the defects, so that the formal industrial implementation of the prelithiation technical scheme is influenced. The lithium-supplementing pole piece is prepared by using special lithium powder supplementing or lithium belt supplementing equipment, and the lithium metal has high activity and light weight, so that the method has high requirement on the preparation environment, and the lithium supplemented in the process of storing or operating the pole piece is easy to oxidize and cannot achieve the effect of supplementing lithium. And secondly, lithium powder, a film forming additive and a solvent are required to be added into the slurry for pre-lithiation, the process of forming the passivation film is uncontrollable, the effect of the passivation film cannot be ensured, and the influence of water is large. And thirdly, the material is pre-lithiated, a special pre-lithiated lithium salt needs to be added, the manufacturing process is complex, the pre-lithiation amount is difficult to control, and the material is more suitable for capacitors instead of lithium batteries.
Disclosure of Invention
To partially or fully solve the above technical problems, it is desirable to provide a lithium ion battery in which the negative electrode is prelithiated.
According to an aspect of the utility model, a lithium ion battery of lithiation is in advance provided to negative pole, include:
the battery cell is made of a positive plate, a negative plate and a diaphragm in a winding or laminating manner;
a protective bag;
a stopper frame;
a housing;
a cover plate;
the battery cell is welded on the cover plate through the positive and negative lugs and is placed in the protective bag; the stop frame is placed in the protection bag and is contained in the shell, and the shell is welded and sealed with the cover plate.
In some examples, the pre-lithiated negative electrode current collector includes a passivation film and a pre-lithiated current collector made by calendaring lithium powder on a porous metal foil, and the passivation film is formed on a surface of the pre-lithiated current collector.
In some examples, the porous metal foil is a porous copper foil.
The utility model discloses well negative pole lithium ion battery of lithiation in advance, negative pole piece in its electric core is made by coating negative pole thick liquids on the lithiation's negative current collector in advance, can offset the loss of lithium ion when first formation, and battery energy density, battery effective capacity etc. are than higher. And, the utility model provides a lithium ion battery's of lithiation is done in advance to the negative pole preparation is simple and easy, and the cost is lower.
Drawings
Fig. 1 is a flow chart of the manufacturing process of the lithium ion battery of the present invention.
Fig. 2 is a schematic diagram of an exemplary structure of a mesoporous current collector of the present invention.
Fig. 3 is a schematic diagram of an exemplary structure of a negative plate in a pre-lithiated lithium ion battery of the present invention.
Fig. 4 is an exemplary schematic diagram of a lithium ion battery with a pre-lithiated negative electrode according to the present invention.
Fig. 5 is an exemplary structural schematic diagram of an electric core in a lithium ion battery with a pre-lithiated negative electrode according to the present invention.
Description of reference numerals:
30. a negative plate; 31. a negative electrode layer; 32. a passivation film; 33. a pre-lithiated current collector;
40. a negative prelithiated lithium ion battery; 41. an electric core; 42. a protective bag; 43. a housing; 44. a cover plate; 51. a positive plate; 52. a diaphragm.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in the case of conflict, the various embodiments and features thereof may be arbitrarily combined with each other.
Fig. 1 shows an exemplary manufacturing process of a lithium ion battery with a pre-lithiated negative electrode provided by the present invention. As shown in fig. 1, the manufacturing process of the lithium ion battery with the pre-lithiated negative electrode may include the following steps:
step S101, manufacturing a pre-lithiated negative current collector;
in some embodiments, this step may include the following sub-steps:
step a1, manufacturing porous metal foil;
in this sub-step, the porous metal foil refers to a metal foil with a plurality of holes, and of course, for some special application scenarios, a single-hole metal foil may also be applicable to the present invention. Fig. 2 shows an exemplary structure of the porous metal foil, and in the example of fig. 2, the holes in the porous metal foil are regularly arranged and are relatively dense, which may be suitable for the case where more lithium metal needs to be pre-buried. It should be noted that fig. 2 is only an example, and in practical applications, the structure of the porous metal foil is not limited to the case shown in fig. 2, and the holes arranged on the porous metal foil may be arranged in a circular arrangement, an irregular arrangement, and the like. Of course, the number and arrangement of the holes on the porous metal foil can be adjusted in time according to the shape or size of the lithium ion battery so as to adapt to the actual requirement for pre-burying a corresponding amount of lithium metal in the lithium ion battery.
In practice, any type of metal may be used for the metal foil. In a preferred embodiment, the porous metal foil may be a porous copper foil.
Step a2, rolling lithium powder on the porous metal foil to obtain a pre-lithiated current collector;
after the treatment of step a2, the lithium will be concentrated mainly in the pores of the porous metal foil.
Step a3, under a low humidity environment, placing the pre-lithiated current collector in an organic solvent in which film-forming organic matters are dissolved, and introducing weak current, forming a passivation film on the surface of the pre-lithiated current collector to form a passivation film on the surface of lithium metal in advance, so that the film-forming agent is adopted to form a protective passivation film on the surface of lithium in advance, and the pre-lithiation effect can be prevented from being influenced by the damage of a subsequent process to the lithium.
Step a4, after a layer of passive film is formed in the pre-lithiated current collector, drying and removing the organic solvent to obtain the pre-lithiated negative current collector.
In step S101, the amount of metal foil used is reduced while prelithiation is performed, and the energy density is increased while reducing the cost. And during manufacturing, the pre-lithiation amount does not need to be accurately controlled, the lithium which is not used up during first formation is still protected by the passivation film, and the lithium can be slowly supplemented to the negative electrode in the subsequent circulation process.
Step S102, coating the prepared negative electrode slurry on the pre-lithiated negative electrode current collector to prepare a negative electrode sheet;
fig. 3 shows an exemplary structure of the negative electrode tab. In the example of fig. 3, the negative electrode sheet 30 includes a negative electrode layer 31, a passivation film 32, and a pre-lithiated current collector 33. As shown in fig. 3, the negative electrode layer 31 is formed of a negative electrode slurry coated on a pre-lithiated negative electrode current collector including a passivation film 32 and a pre-lithiated current collector 33, the formation process of which is referred to step S101.
And step S103, preparing a lithium ion battery with a pre-lithiated negative electrode by using the negative electrode sheet.
In at least some examples, this step can include the following sub-steps:
step b1, preparing a battery cell from the pre-manufactured positive plate, the pre-lithiated negative plate and the diaphragm in a winding or laminating manner;
here, the positive electrode sheet can be manufactured by a general method of manufacturing a positive electrode sheet. For example, the positive electrode slurry is uniformly applied directly onto the positive electrode current collector.
Step b2, welding the battery cell on a cover plate through positive and negative lugs;
for example, the battery cell can be welded on the cover plate through the positive and negative lugs by bolts or other similar methods.
Step b3, placing the battery cell into a protection bag, placing a stop frame, and then placing the battery cell into a shell to perform shell cover welding and sealing;
and b4, filling the electrolyte, ensuring that the electrolyte is filled in the battery, and standing.
Specifically, the electrolyte is filled into the battery with qualified moisture content, and the battery is kept stand after the electrolyte is filled in the battery.
And b5, aging, forming, sealing, grading and detecting the battery cell after liquid injection to prepare the lithium ion battery with the pre-lithiated cathode.
In step b5, any other preparation steps may be included besides aging, formation, sealing, capacity grading and detection, which is not limited by the present invention.
Lithium ion battery can constantly reduce in the use energy, and its reason becomes the activation for active lithium ion's loss, especially for the first time, has a large amount of active lithium ion because of forming SEI membrane or side reaction loss, causes active material's the lithium state that lacks, consequently the utility model discloses an above-mentioned manufacturing approach makes the lithium ion battery of negative pole prelithiation through the method of prelithiation, can offset the loss of lithium ion when becoming for the first time to effectively improve the battery energy, improve battery energy density, increase battery effective capacity. And, the utility model provides a lithium ion battery's of lithiation is in advance carried out to the negative pole preparation method, through lithiation in advance on the mass flow body, preparation method is simple and easy, and the cost is lower. In application scenarios such as electric vehicles and electronic products which need a lithium ion battery to determine endurance mileage or standby duration, the endurance duration of the lithium ion battery is greatly improved, the use by a user is facilitated, and the user experience is improved.
The utility model provides a lithium ion battery of lithiation in advance of negative pole, this lithium ion battery can make through foretell preparation flow.
Fig. 4 shows an exemplary structure of a lithium ion battery in which the negative electrode is prelithiated according to the present invention. As shown in fig. 4, an exemplary negative prelithiated lithium ion battery 40 may include: a battery cell 41, a protective bag 42, a stopper bracket (not shown), a housing 43, and a cover plate 44. The battery cell 41 is welded to the cover plate 44 through the positive and negative lugs and is placed in the protective bag 42, and a stopper (not shown) is placed in the protective bag 42 and is accommodated in the housing 43. In practical applications, the housing 43 is welded and sealed to the cover plate 44. Fig. 4 shows a disassembled structure of the case 43, the lid 44, the cell 41, and the like, only for illustrating the internal structure of the negative electrode prelithiated lithium ion battery 40.
Fig. 5 shows an exemplary structure of the battery cell 41. As shown in fig. 5, the battery cell 41 may be formed by winding or laminating a positive electrode sheet 51, a negative electrode sheet 30 and a separator 52, the negative electrode sheet 30 is formed by coating a negative electrode slurry on a pre-lithiated negative electrode current collector, and the specific manufacturing process and the structure of the negative electrode sheet 30 refer to the above description and fig. 3, which are not repeated. In some embodiments, the pre-lithiated negative electrode current collector may include a passivation film 32 and a pre-lithiated current collector 33, the pre-lithiated current collector 33 is made by rolling lithium powder on a porous metal foil, and the passivation film 32 is formed on the surface of the pre-lithiated current collector 33. The specific technical details of the pre-lithiated negative electrode current collector and the negative electrode sheet can refer to the description of the method above, and are not repeated. Here, the porous metal foil may be a porous copper foil, and the specific technical details thereof may also refer to the description related to the above method section.
The utility model provides a lithium ion battery of lithiation is in advance to negative pole, because of its negative pole piece has passed through the processing of lithiation in advance, this lithium ion battery can offset the loss of lithium ion when first formation through pre-buried lithium in the negative pole piece when using to effectively improve the battery energy, improve battery energy density, increase battery effective capacity. In application scenarios such as electric vehicles and electronic products which need a lithium ion battery to determine endurance mileage or standby duration, the endurance duration of the lithium ion battery is greatly improved, the use by a user is facilitated, and the user experience is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A negative prelithiated lithium ion battery comprising:
the battery cell is made of a positive plate, a negative plate and a diaphragm in a winding or laminating manner;
a protective bag;
a stopper frame;
a housing;
a cover plate;
the battery cell is welded on the cover plate through the positive and negative lugs and is placed in the protective bag; the stop frame is placed in the protection bag and is contained in the shell, and the shell is welded and sealed with the cover plate.
2. The lithium ion battery of claim 1, wherein the pre-lithiated negative electrode current collector comprises a passivation film and a pre-lithiated current collector, the pre-lithiated current collector is made by calendaring lithium powder on a porous metal foil, and the passivation film is formed on a surface of the pre-lithiated current collector.
3. The lithium ion battery of claim 2, wherein the porous metal foil is a porous copper foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021250260.1U CN212113927U (en) | 2020-06-30 | 2020-06-30 | Lithium ion battery with pre-lithiated cathode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021250260.1U CN212113927U (en) | 2020-06-30 | 2020-06-30 | Lithium ion battery with pre-lithiated cathode |
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| CN212113927U true CN212113927U (en) | 2020-12-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023029002A1 (en) * | 2021-09-03 | 2023-03-09 | 宁德时代新能源科技股份有限公司 | Negative current collector and secondary battery comprising same, and battery module, battery pack and electric device |
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2020
- 2020-06-30 CN CN202021250260.1U patent/CN212113927U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023029002A1 (en) * | 2021-09-03 | 2023-03-09 | 宁德时代新能源科技股份有限公司 | Negative current collector and secondary battery comprising same, and battery module, battery pack and electric device |
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