CN117174828A - Lithium battery and electrode slice and battery core thereof - Google Patents
Lithium battery and electrode slice and battery core thereof Download PDFInfo
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- CN117174828A CN117174828A CN202311329191.1A CN202311329191A CN117174828A CN 117174828 A CN117174828 A CN 117174828A CN 202311329191 A CN202311329191 A CN 202311329191A CN 117174828 A CN117174828 A CN 117174828A
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- active material
- electrode active
- lithium battery
- layer
- electrode
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 53
- 239000007772 electrode material Substances 0.000 claims abstract description 66
- 239000011230 binding agent Substances 0.000 claims abstract description 36
- 239000000853 adhesive Substances 0.000 claims abstract description 12
- 230000001070 adhesive effect Effects 0.000 claims abstract description 12
- 239000006258 conductive agent Substances 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 229910052799 carbon Inorganic materials 0.000 claims description 15
- 239000007774 positive electrode material Substances 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 239000007773 negative electrode material Substances 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 150000002170 ethers Chemical class 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 230000010354 integration Effects 0.000 abstract description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 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
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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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- Battery Electrode And Active Subsutance (AREA)
Abstract
The embodiment of the disclosure provides a lithium battery and an electrode slice and a battery core thereof, wherein the lithium battery electrode slice comprises: a current collector; the electrode active materials are coated outside the current collector and are of a laminated structure, and each layer of electrode active material comprises an electrode active material, a conductive agent and an adhesive; in the laminated structure, the mass ratio of the binder in the electrode active material layer located at the top layer is higher than that in the electrode active material layer other than the top layer. In the embodiment of the disclosure, the quality of the binder in the electrode active material layer of the top layer is relatively high, so that the bonding strength of the electrode plate and the diaphragm is relatively high when the electrode plate and the diaphragm are assembled into the lithium battery cell, and the lithium battery cell is relatively high in integration level and relatively stable and reliable in structure.
Description
Technical Field
The disclosure relates to the technical field of lithium battery cells, in particular to a lithium battery, an electrode slice and an electric core thereof.
Background
Lithium batteries (in english) are a type of rechargeable battery that operate primarily by means of Lithium ions moving between a positive electrode and a negative electrode.
The lithium battery device has the advantages of high energy conversion efficiency, long cycle life, convenience in assembly and the like. The energy storage device is widely applied to the fields of automobiles and energy storage. With the development of industry, the performance and cost of lithium batteries are increasingly high, so a solution is needed that can maintain the performance of lithium batteries and reduce the cost of lithium batteries.
Disclosure of Invention
In view of the above drawbacks of the related art, an object of the present disclosure is to provide a lithium battery, an electrode sheet and a battery cell thereof, so as to solve the technical problem of poor performance of the lithium battery in the related art.
A first aspect of the present disclosure provides a lithium battery electrode sheet, comprising:
a current collector;
the electrode active materials are coated outside the current collector and are of a laminated structure, and each layer of electrode active material comprises an electrode active material, a conductive agent and an adhesive;
in the laminated structure, the mass ratio of the binder in the electrode active material layer located at the top layer is higher than that in the electrode active material layer other than the top layer.
Optionally, the positive electrode active material layer of the top layer has a thickness in the laminated structure in the range of 1% -10%.
Optionally, in the laminated structure, in the electrode active material layer of the top layer, the mass ratio of the binder is not less than 40%;
the mass ratio of the binder in at least one electrode active material layer other than the top layer is not more than 5%.
Optionally, in the laminated structure, in the electrode active material layer of the top layer, the mass ratio of the electrode active material, the binder and the conductive carbon is 55:44:1, a step of;
in at least one electrode active material layer outside the top layer, the mass ratio of the electrode active material, the binder and the conductive agent is 97:2:1.
optionally, the binder is at least one of polyvinylidene fluoride, polyvinyl alcohol, styrene-butadiene rubber, polyvinylpyrrolidone and ethers.
Optionally, the electrode sheet is a positive electrode sheet, the electrode active material is a positive electrode active material, and the electrode active material is a positive electrode active material.
Optionally, the electrode sheet is a negative electrode sheet, the electrode active material is a negative electrode active material, and the electrode active material is a negative electrode active material.
The second aspect of the present disclosure also provides a lithium battery cell, comprising:
a positive plate;
a negative electrode sheet;
a separator disposed between the positive electrode sheet and the negative electrode sheet;
at least one of the positive plate and the negative plate is set as the lithium battery electrode plate.
Optionally, the separator is provided as a base film without an adhesive coating.
A third aspect of the present disclosure also provides a lithium battery, comprising:
the lithium battery cell.
As described above, in the embodiments of the present disclosure, a lithium battery, an electrode slice and an electric core thereof are provided, where the electrode slice of the lithium battery includes: a current collector; the electrode active materials are coated outside the current collector and are of a laminated structure, and each layer of electrode active material comprises an electrode active material, a conductive agent and an adhesive; in the laminated structure, the mass ratio of the binder in the electrode active material layer located at the top layer is higher than that in the electrode active material layer other than the top layer. In the embodiment of the disclosure, the quality of the binder in the electrode active material layer of the top layer is relatively high, so that the bonding strength of the electrode plate and the diaphragm is relatively high when the electrode plate and the diaphragm are assembled into the lithium battery cell, and the lithium battery cell is relatively high in integration level and relatively stable and reliable in structure.
Drawings
Fig. 1 shows a cross-sectional view of a lithium battery electrode sheet provided by an embodiment of the present disclosure.
Fig. 2 is a cross-sectional view of a lithium battery provided in an embodiment of the present disclosure.
Detailed Description
Other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the following description of the embodiments of the disclosure by means of specific examples. The disclosure may be practiced or carried out in other embodiments or applications, and details of the disclosure may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.
The embodiments of the present disclosure will be described in detail below with reference to the attached drawings so that those skilled in the art to which the present disclosure pertains can easily implement the same. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein.
In the description of the present disclosure, references to the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples, as well as features of various embodiments or examples, presented in this disclosure may be combined and combined by those skilled in the art without contradiction.
Although not differently defined, including technical and scientific terms used herein, all terms have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The term append defined in commonly used dictionaries is interpreted as having a meaning that is consistent with the meaning of the relevant technical literature and the currently prompted message, and is not excessively interpreted as an ideal or very formulaic meaning, so long as no definition is made.
Fig. 1 shows a cross-sectional view of a lithium battery electrode sheet provided by an embodiment of the present disclosure, as shown in fig. 1, the lithium battery electrode sheet includes:
a current collector 10;
the electrode active material 11 is coated outside the current collector 10, the electrode active material has a laminated structure, and each layer of electrode active material comprises an electrode active material, a conductive agent and an adhesive;
in the laminated structure, the mass ratio of the binder in the electrode active material layer 111 located at the top layer is higher than that in the electrode active material layer 112 other than the top layer.
In the embodiment of the present disclosure, the electrode active material layer 111 of the top layer is located farthest from the current collector 10 at the outer layer of the electrode sheet, in contrast to the other electrode active material layers 112 at the inner layer. Because the quality of the binder in the electrode active material layer 111 of the top layer is relatively high, the bonding strength between the electrode plate and the diaphragm is high when the electrode plate is assembled into the lithium battery cell, and the lithium battery cell is higher in integration level and more stable and reliable in structure.
In the embodiment shown in fig. 1, the laminated structure is a two-layer structure. In further embodiments, the laminate structure may also be at least a three-layer laminate structure.
In the embodiments of the present disclosure, the electrode active material layer of the stacked structure may be sequentially fabricated outside the current collector 10 using a double-layer or multi-layer coating or spray coating technique.
In the embodiment of the present disclosure, the thickness of the positive electrode active material layer 111 of the top layer in the stacked structure ranges from 1% to 10%. In this embodiment, the thickness of the top positive electrode active material layer 111 is small, and the positive electrode active material layer 112 outside the top positive electrode active material layer 111 maintains the original structure and material composition, thereby maintaining the overall performance of the lithium battery electrode sheet.
In the embodiment of the present disclosure, in the stacked structure, the mass ratio of the binder in the electrode active material layer 111 of the top layer is not less than 40%. The mass ratio of the binder in at least one electrode active material layer other than the top layer is not more than 5%.
In the electrode active material layer 111 of the top layer, the binder is used for bonding the cell separator, and in the above mass ratio range, sufficient bonding strength can be provided, and the electrode active material and the conductive agent can maintain their electrical functions to some extent. In the electrode active material layer 112 of the lower layer, the binder is used to bind the electrode active material and the conductive agent, and the lithium battery electrode sheet can maintain good electrical functions through the above-mentioned ratio range.
In the embodiment of the disclosure, the stacked structure is a double-layer structure, and in the electrode active material layer 111 of the top layer, the mass ratio of the electrode active material, the binder and the conductive carbon is: 97:2:1, a step of;
in the electrode active material layer of the bottom layer, the mass ratio of the electrode active material, the binder and the conductive carbon is as follows: 55:44:1.
according to the corresponding experimental results, the electrical performance of the lithium battery is measured to be better by using the parameters. The following description is made in connection with a plurality of sets of experimental data:
a first group:
positive electrode formula one: lithium iron phosphate: and (2) a binder: conductive carbon is 97:2:1;
and a second positive electrode formula: lithium iron phosphate: and (2) a binder: conductive carbon is 55:44:1;
the preparation of the positive plate adopts a double-layer coating technology, the thickness of the bottom layer accounts for 99 percent, and the formula of the bottom layer adopts a first positive formula; the thickness of the top layer is 1% of the total thickness, and the top layer adopts a second positive electrode formula.
Second group:
positive electrode formula one: lithium iron phosphate: and (2) a binder: conductive carbon is 97:2:1;
and a positive electrode formula III: lithium iron phosphate: and (2) a binder: conductive carbon 58:41:1;
the preparation of the positive plate adopts a double-layer coating technology, the thickness of the bottom layer accounts for 99 percent, and the formula of the bottom layer adopts a first positive formula; the thickness of the top layer is 1% of the total thickness, and the top layer adopts a third positive electrode formula.
Third group:
positive electrode formula one: lithium iron phosphate: and (2) a binder: conductive carbon is 97:2:1;
and a positive electrode formula IV: lithium iron phosphate: and (2) a binder: conductive carbon is 61:38:1;
the preparation of the positive plate adopts a double-layer coating technology, the thickness of the bottom layer accounts for 99 percent, and the formula of the bottom layer adopts a first positive formula; the thickness of the top layer is 1% of the total thickness, and the top layer adopts a fourth positive electrode formula.
Fourth group:
positive electrode formula one: lithium iron phosphate: and (2) a binder: conductive carbon is 97:2:1;
and a second positive electrode formula: lithium iron phosphate: and (2) a binder: conductive carbon is 55:44:1;
the preparation of the positive plate adopts a double-layer coating technology, the thickness of the bottom layer accounts for 95%, and the formula of the bottom layer adopts a first positive formula; the thickness of the top layer is 5% of the total thickness, and the top layer adopts a second positive electrode formula.
Fifth group:
positive electrode formula one: lithium iron phosphate: and (2) a binder: conductive carbon is 97:2:1;
and a second positive electrode formula: lithium iron phosphate: and (2) a binder: conductive carbon is 55:44:1;
the preparation of the positive plate adopts a double-layer coating technology, the thickness of the bottom layer accounts for 90 percent, and the formula of the bottom layer adopts a first positive formula; the thickness of the top layer is 10% of the total thickness, and the top layer adopts a second positive electrode formula.
The formula of the negative electrode comprises the following steps: graphite: and (2) a binder: conductive carbon: the plasticizer is 95:2:2:1, coating the prepared slurry on a copper foil.
The battery cell is prepared by forming the positive electrode plate and the negative electrode plate, and is disassembled after full charge, so that the following table parameters are obtained:
it is clear from the table that the bonding force between the electrode plate and the diaphragm in the lithium battery is large, the bonding effect of the bare cell is good, and the electrode plate has no wrinkling effect by using the corresponding parameters in the first group, the fourth group and the fifth group.
In the embodiment of the present disclosure, the thickness of the positive electrode active material layer 111 of the top layer in the stacked structure ranges from 1% to 10%. In this range, referring to the above experimental data, the adhesion between the electrode sheet and the separator is better, and the structural stability of the lithium battery cell is better.
In an embodiment of the disclosure, the binder is at least one of polyvinylidene fluoride, polyvinyl alcohol, styrene-butadiene rubber, polyvinylpyrrolidone, and ethers. The adhesive selected in this example can achieve the desired adhesion.
In the embodiment of the disclosure, the electrode sheet may be a positive electrode sheet, the electrode active material is a positive electrode active material, and the electrode active material is a positive electrode active material; or the electrode plate is a negative electrode plate, the electrode active material is a negative electrode active material, and the electrode active material is a negative electrode active material.
The embodiment of the disclosure further provides a lithium battery cell, as shown in fig. 2, including:
a positive electrode sheet 21;
a negative electrode sheet 22;
a separator 23 provided between the positive electrode sheet 21 and the negative electrode sheet 22;
at least one of the positive electrode tab 21 and the negative electrode tab 22 is provided as the lithium battery electrode tab shown in fig. 1.
In this embodiment, the positive electrode sheet 21, the negative electrode sheet 22, and the separator 23 are wound together by a winding technique to form a lithium battery cell.
In other embodiments, the positive electrode sheet 21, the negative electrode sheet 22, and the separator 23 may be stacked using lamination techniques to obtain a lithium battery cell.
In the presently disclosed embodiment, the separator 23 is provided as a base film without an adhesive coating. Because the top layer adhesive of the positive electrode sheet 21 and/or the negative electrode sheet 22 has a high mass ratio, a strong adhesive force with the separator can be provided, and the separator can be free from being coated with an adhesive coating, so that the manufacturing cost of a product is reduced.
The disclosed embodiments also provide a lithium battery, which includes:
the lithium battery cell of the above embodiment.
The above embodiments are merely illustrative of the principles of the present disclosure and its efficacy, and are not intended to limit the disclosure. Modifications and variations may be made to the above-described embodiments by those of ordinary skill in the art without departing from the spirit and scope of the present disclosure. Accordingly, it is intended that all equivalent modifications and variations which a person having ordinary skill in the art would accomplish without departing from the spirit and technical spirit of the present disclosure be covered by the claims of the present disclosure.
Claims (10)
1. A lithium battery electrode sheet, comprising:
a current collector;
the electrode active materials are coated outside the current collector and are of a laminated structure, and each layer of electrode active material comprises an electrode active material, a conductive agent and an adhesive;
in the laminated structure, the mass ratio of the binder in the electrode active material layer located at the top layer is higher than that in the electrode active material layer other than the top layer.
2. The lithium battery electrode sheet according to claim 1, wherein the positive electrode active material layer of the top layer has a thickness in the stacked structure in a range of 1% -10%.
3. The lithium battery electrode sheet according to claim 2, wherein in the laminated structure, in the electrode active material layer of the top layer, the mass ratio of the binder is not less than 40%;
the mass ratio of the binder in at least one electrode active material layer other than the top layer is not more than 5%.
4. The lithium battery electrode sheet according to claim 3, wherein in the laminated structure, in the electrode active material layer of the top layer, the mass ratio of the electrode active material, the binder and the conductive carbon ranges from 55:44:1, a step of;
in at least one electrode active material layer outside the top layer, the mass ratio of the electrode active material, the binder and the conductive agent is 97:2:1.
5. the lithium battery electrode sheet according to claim 1, wherein the binder is at least one of polyvinylidene fluoride, polyvinyl alcohol, styrene-butadiene rubber, polyvinylpyrrolidone, and ethers.
6. The lithium battery electrode sheet according to claim 1, wherein the electrode sheet is a positive electrode sheet, the electrode active material is a positive electrode active material, and the electrode active material is a positive electrode active material.
7. The lithium battery electrode sheet according to claim 1, wherein the electrode sheet is a negative electrode sheet, the electrode active material is a negative electrode active material, and the electrode active material is a negative electrode active material.
8. A lithium battery cell, comprising:
a positive plate;
a negative electrode sheet;
a separator disposed between the positive electrode sheet and the negative electrode sheet;
at least one of the positive and negative electrode sheets is provided as the lithium battery electrode sheet of any one of claims 1 to 7.
9. The lithium battery cell of claim 8, wherein the separator is provided as a base film without an adhesive coating.
10. A lithium battery, comprising:
the lithium battery cell of claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311329191.1A CN117174828A (en) | 2023-10-13 | 2023-10-13 | Lithium battery and electrode slice and battery core thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311329191.1A CN117174828A (en) | 2023-10-13 | 2023-10-13 | Lithium battery and electrode slice and battery core thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117174828A true CN117174828A (en) | 2023-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311329191.1A Pending CN117174828A (en) | 2023-10-13 | 2023-10-13 | Lithium battery and electrode slice and battery core thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117174828A (en) |
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2023
- 2023-10-13 CN CN202311329191.1A patent/CN117174828A/en active Pending
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