CN218039282U - Negative pole piece and battery - Google Patents
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- CN218039282U CN218039282U CN202221893756.XU CN202221893756U CN218039282U CN 218039282 U CN218039282 U CN 218039282U CN 202221893756 U CN202221893756 U CN 202221893756U CN 218039282 U CN218039282 U CN 218039282U
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- 229910021385 hard carbon Inorganic materials 0.000 claims abstract description 33
- 239000010410 layer Substances 0.000 claims description 108
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 27
- 229910002804 graphite Inorganic materials 0.000 claims description 23
- 239000010439 graphite Substances 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 13
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- 238000000576 coating method Methods 0.000 description 19
- 239000011248 coating agent Substances 0.000 description 17
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 13
- 229910052744 lithium Inorganic materials 0.000 description 13
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- 239000007788 liquid Substances 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
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- 239000002033 PVDF binder Substances 0.000 description 2
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- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 2
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- 238000005507 spraying Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- OQMIRQSWHKCKNJ-UHFFFAOYSA-N 1,1-difluoroethene;1,1,2,3,3,3-hexafluoroprop-1-ene Chemical group FC(F)=C.FC(F)=C(F)C(F)(F)F OQMIRQSWHKCKNJ-UHFFFAOYSA-N 0.000 description 1
- 241000446313 Lamella Species 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
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- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
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Images
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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Abstract
The utility model belongs to the technical field of the battery, a negative pole piece and battery is disclosed. The negative pole piece comprises a current collector and a slurry layer, wherein the slurry layer is coated on the current collector and comprises hard carbon, and the slurry layer containing the hard carbon is coated on the current collector, so that the charge transfer internal resistance and the ohm internal resistance of the negative pole piece can be effectively reduced under the condition of not changing the structure of the current collector, and the performance of a battery is improved.
Description
Technical Field
The utility model relates to a battery technology field especially relates to a negative pole piece and battery.
Background
The lithium ion battery is widely applied to 3C digital products due to the characteristics of high energy density, long cycle life, no memory effect, adjustable shape and size and the like, and along with the development of new energy industry, the lithium ion battery is widely applied to electric automobiles as a new energy source.
When the lithium ion battery is charged, lithium ions are extracted from the positive electrode, enter the electrolyte, pass through the diaphragm to reach the surface of the negative electrode, and then are embedded into micropores of the negative electrode. In the prior art, a negative pole piece is a single body made of a single material and with a single structure, and due to the characteristics of graphite, the graphite collapses in structure and lithium storage sites are damaged to form lithium precipitation due to the gas generated by a negative pole and side reaction with electrolyte in a circulation process, so that the polarization of a battery is intensified, and the electrical property of the battery is influenced.
Therefore, a need exists for a negative electrode material and a battery that solve the problems of the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a negative pole piece and battery can reduce the charge transfer internal resistance and the ohmic internal resistance of negative pole piece, improves the performance of battery.
To achieve the purpose, the utility model adopts the following technical proposal:
the negative pole piece comprises a current collector and a slurry layer, wherein the slurry layer is arranged on the current collector and provided with hard carbon.
Optionally, the slurry layer includes a first slurry layer and a second slurry layer, the first slurry layer is disposed on the current collector, the second slurry layer is disposed on the first slurry layer, and the hard carbon is disposed on the second slurry layer.
Optionally, the second slurry layer has a thickness of 0.1 μm to 10 μm.
Optionally, the solids content of the second slurry layer is 3% to 60%.
Optionally, the hard carbon is a spherical structure, and the diameter of the hard carbon is 1 μm to 5 μm.
Optionally, the first slurry layer is provided with graphite particles having a particle size of 15 μm to 30 μm.
Optionally, the hard carbon is disposed on a surface layer and in interstices of the graphite particles.
Optionally, the thickness of the first slurry layer is 50 μm to 100 μm.
Optionally, the first slurry layer has a solids content of 40% to 60%.
Another object of the utility model is to provide a battery can reduce the polarization of negative pole piece, improves the lithium window of analysing of negative pole piece, improves the performance of battery.
A battery comprises the negative pole piece.
Has the advantages that:
the utility model provides a negative pole piece, including mass flow body and thick liquids layer, the thick liquids layer sets up on the mass flow body, includes hard carbon in the thick liquids layer, through set up the thick liquids layer that contains hard carbon on the mass flow body, can guarantee under the condition that does not change the mass flow body structure, effectively reduces negative pole piece's charge transfer internal resistance and ohmic internal resistance, improves the performance of battery.
The utility model provides a battery through adopting foretell negative pole piece, has reduced the internal resistance of battery, has reduced the loss of electric quantity in the battery is inside, can obviously improve the performance of battery.
Drawings
Fig. 1 is a schematic structural diagram of a negative electrode plate according to an embodiment of the present invention.
In the figure:
100. a current collector; 200. a slurry layer; 210. a first slurry layer; 220. a second slurry layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
The present embodiment provides a negative electrode tab, as shown in fig. 1, the negative electrode tab includes a current collector 100 and a slurry layer 200, the slurry layer 200 is disposed on the current collector 100, hard carbon is disposed in the slurry layer 200, and by disposing the slurry layer 200 containing hard carbon on the current collector 100, it can be ensured that the internal resistance of charge transfer and the internal resistance of ohm of the negative electrode tab are effectively reduced without changing the structure of the current collector 100, and the performance of the battery is improved. And the lithium storage point of the negative pole piece provided by the embodiment is not easy to be damaged, so that the lithium analysis window is obviously improved in the high-rate circulation and low-temperature environment in the battery, lithium ions which are extracted from the positive pole can be embedded into the negative pole piece, the polarization of the negative pole piece of the battery is slowed down, and the service life of the battery is prolonged.
Preferably, as shown in fig. 1, the slurry layer 200 includes a first slurry layer 210 and a second slurry layer 220, the first slurry layer 210 is coated on the current collector 100, the second slurry layer 220 is coated on the first slurry layer 210, and the hard carbon is disposed in the second slurry layer 220, and in the coating process, any one of a micro-concave roller, a spray coating or a scratch coating mode may be selected to coat the second slurry layer 220 on the first slurry layer 210, in this embodiment, the second slurry layer 220 is preferably coated on the first slurry layer 210 by the micro-concave roller, so that the hard carbon can be more uniformly distributed on the second slurry layer 220, and the internal resistance of charge transfer of the negative electrode plate are further reduced.
Optionally, the first slurry layer 210 is provided with graphite particles, and the particle size of the graphite particles is 15 μm to 30 μm, specifically, the diameter of the graphite particles may be 20 μm, 25 μm, and the like, and the diameter of the graphite particles is preferably 20 μm in this embodiment, which can ensure good conductivity of the first slurry layer 210.
Alternatively, the hard carbon in the present embodiment is disposed in the surface layer and the gaps of the graphite particles, and it is understood that at the interface between the second slurry layer 220 and the first slurry layer 210, the hard carbon of the second slurry layer 220 can be embedded into the gaps of the graphite particles of the first slurry layer 210 to eliminate the tip effect of the surface layer of the graphite particles.
Specifically, the first slurry layer 210 is made of graphite, and since the overall performance of graphite is excellent, the conductivity of the current collector can be improved, in this embodiment, a hard carbon coating (the second slurry layer 220) is added on the conventional graphite coating (the first slurry layer 210), and at the interface between the hard carbon coating and the graphite coating, the hard carbon can be embedded into the gaps of the graphite particles, so as to eliminate the tip effect of graphite and reduce the surface polarization. Set up the one side of keeping away from mass flow body 100 at graphite coating, because the carbonization temperature of hard carbon is high, the structure is comparatively firm, can protect the graphite structure in the outside, avoids arousing collapsing of graphite lamella in the circulation process to hard carbon capacity in this embodiment is high, the impedance is low, can accelerate the lithium ion transmission speed on negative pole top layer, alleviates the drawback that the electrolyte diffusion rate is slow that graphite top layer excessive pressure arouses.
Preferably, the thickness of the second paste layer 220 is 0.1 μm to 10 μm, specifically, the thickness of the second paste layer 220 may be 0.2 μm, 0.8 μm, 1 μm, 2 μm, 4 μm, 6 μm, 8 μm, and in this embodiment, the thickness of the second paste layer 220 is preferably 2.5 μm, which can ensure that the negative electrode plate has the best conductive performance.
Preferably, the solid content of the second slurry layer 220 is 3% to 60%, specifically, the solid content of the second slurry layer 220 may be 10%, 20%, 30%, 40%, 50%, where the solid content is a mass percentage of the remaining portion of the coating material of the second slurry layer 220 after drying under a specified condition. In this embodiment, the solid content of the second slurry layer 220 is preferably 30%, which can ensure that the hard carbon in the second slurry layer 220 is uniformly dispersed, further reduce the internal resistance of charge transfer and the internal resistance of ohm of the negative electrode plate, and improve the performance of the battery.
Preferably, the hard carbon in this embodiment is spherical particles with smooth surfaces and regular shapes, the diameter of the hard carbon is 1 μm to 5 μm, specifically, the diameter of the hard carbon with a spherical structure may be 2 μm, 3 μm, 4 μm, and in this embodiment, the diameter of the hard carbon particles is preferably 3 μm, so as to ensure the distribution density of the hard carbon on the second slurry layer 220, thereby ensuring that the lithium deposition window of the negative electrode plate can be significantly improved at low temperature.
Alternatively, the thickness of the first paste layer 210 is 50 μm to 100 μm, and specifically, the thickness of the first paste layer 210 may be 60 μm, 70 μm, 80 μm, 90 μm, or the like.
Optionally, the solids content of the first slurry layer 210 is 40% -60%. Specifically, the solid content of the first slurry layer 210 may be 45%, 50%, 55%, and the like, and in this embodiment, the solid content of the first slurry layer 210 is preferably 50%, which can ensure that graphite particles in the first slurry layer 210 are uniformly dispersed, further reduce the internal resistance of charge transfer and the internal resistance of ohm of the negative electrode plate, and improve the performance of the battery.
Optionally, the first slurry layer 210 may further include at least one of a conductive agent, a binder, and a dispersant, which can improve the conductive performance of the current collector 100.
Specifically, the conductive agent comprises one or more of carbon black nanoparticles, carbon nanotubes, carbon nanorods, ketjen black, acetylene black and graphene.
Specifically, the binder includes one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose, lithium carboxymethyl cellulose, polyacrylic acid, sodium polyacrylate, lithium polyacrylate, polyacrylonitrile, styrene butadiene rubber, polyethylene oxide, polyvinylidene fluoride, polyvinylpyrrolidone, polyester, polyamide, and polymethyl methacrylate.
Specifically, the dispersant is one or more of sodium carboxymethylcellulose, polyacrylic acid, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene polymer, polyacrylonitrile, sodium polyphosphate, copolymer of polymer monomer and copolymer of polymer.
Specifically, the second slurry layer 220 in the present embodiment may include one or more of a conductive agent, a binder, and a dispersant in addition to the hard carbon particles.
Carry out two
The utility model provides a preparation method of negative pole piece will be earlier on first thick liquids layer 210 coats the mass flow body, toasts first thick liquids layer 210, colds pressing first thick liquids layer 210, then at coating second thick liquids layer 220, specific coating step is:
s21, selecting the first slurry layer 210 as one of the conductive agent, the adhesive and the dispersant, and searching for a formula corresponding to the selected first slurry layer 210 to obtain the slurry required by the first slurry layer 210, where it should be noted that the preparation formula of the conductive agent, the adhesive and the dispersant is a mature technical means in the field and is not described herein again.
S22, coating the slurry of the first slurry layer 210 on the current collector 100 by spraying or blade coating, and then baking to obtain a pole piece, where the baking temperature is 60 ℃ to 80 ℃, and the baking temperature is preferably 70 ℃ in this embodiment.
And S23, carrying out cold pressing on the pole piece prepared in the step S22, wherein the cold pressing coefficient is less than 1.
S24, selecting the second slurry layer 220 as one of a conductive agent, a bonding agent and a dispersing agent, searching a formula of the second slurry layer 220 correspondingly selected, and adding hard carbon to prepare the slurry required by the second slurry layer 220, wherein the solid content of the slurry required by the second slurry layer 220 is 20%.
And S25, coating the slurry of the second slurry layer 220 on the first slurry layer 210 through a micro gravure roll, wherein the coating thickness is 2.5 microns.
S26, baking at the temperature of 70 ℃ to obtain the negative pole piece.
The negative pole piece prepared by the method provided by the embodiment has the advantages that the lithium separation window is obviously improved, and the battery performance is obviously improved.
EXAMPLE III
The embodiment provides another preparation method of the negative electrode plate, and the difference from the second embodiment is that in the coating process of the embodiment, after the first slurry layer 210 is coated, the first slurry layer 210 is baked, the second slurry layer 220 is continuously coated on the dried first slurry layer 210, and finally cold pressing is performed, and the specific operation steps are as follows:
s31, selecting the first slurry layer 210 as one of the conductive agent, the adhesive and the dispersant, and searching for a formula corresponding to the selected first slurry layer 210 to obtain the slurry required by the first slurry layer 210, where it should be noted that the formula for preparing the conductive agent, the adhesive and the dispersant is a mature technical means in the field and is not described herein again.
And S32, coating the slurry of the first slurry layer 210 on the current collector 100 in a blade coating or micro gravure roll mode, and then baking at the baking temperature of 75 ℃.
S33, selecting the second slurry layer 220 as one of a conductive agent, a bonding agent and a dispersing agent, searching a formula of the second slurry layer 220 correspondingly selected, and adding hard carbon to prepare the slurry required by the second slurry layer 220, wherein the solid content of the slurry required by the second slurry layer 220 is 25%.
And S34, coating the slurry of the second slurry layer 220 on the dried first slurry layer 210 in a blade coating or micro gravure roller mode to obtain the pole piece.
S35, baking the pole piece obtained in the step S34 at the baking temperature of 75 ℃, and then cold pressing the pole piece, wherein the cold pressing coefficient is less than 1, so as to obtain the negative pole piece.
The negative pole piece prepared by the method provided by the embodiment has the advantages that the lithium separation window is obviously improved, and the battery performance is obviously improved.
Example four
The embodiment provides a battery, including above-mentioned negative pole piece, can reduce the internal resistance of battery, reduced the loss of electric quantity in the battery to lithium window has obviously promoted, and the SOC (state of charge) of battery when lithium is separated out has improved, makes the battery more resistant to separating out lithium, obviously improves the performance of battery.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The negative pole piece is characterized by comprising a current collector (100) and a slurry layer (200), wherein the slurry layer (200) is arranged on the current collector (100), and hard carbon is arranged on the slurry layer (200).
2. The negative electrode tab of claim 1, wherein the paste layer (200) comprises a first paste layer (210) and a second paste layer (220), the first paste layer (210) is disposed on the current collector (100), the second paste layer (220) is disposed on the first paste layer (210), and the hard carbon is disposed on the second paste layer (220).
3. Negative electrode sheet according to claim 2, characterized in that the thickness of the second paste layer (220) is 0.1 μm to 10 μm.
4. The negative electrode sheet according to claim 2, wherein the solid content of the second slurry layer (220) is 3-60%.
5. The negative electrode tab of any one of claims 1 to 4, wherein the hard carbon is in a spherical structure and has a diameter of 1 μm to 5 μm.
6. The negative electrode tab of claim 2, characterized in that the first slurry layer (210) is provided with graphite particles having a particle size of 15-30 μm.
7. The negative electrode sheet of claim 6, wherein the hard carbon is disposed on a surface layer and in gaps of the graphite particles.
8. Negative electrode sheet according to claim 2, characterized in that the thickness of the first paste layer (210) is 50 μm-100 μm.
9. The negative electrode sheet according to claim 2, characterized in that the solid content of the first slurry layer (210) is 40-60%.
10. A battery comprising a negative electrode tab according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221893756.XU CN218039282U (en) | 2022-07-21 | 2022-07-21 | Negative pole piece and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221893756.XU CN218039282U (en) | 2022-07-21 | 2022-07-21 | Negative pole piece and battery |
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| Publication Number | Publication Date |
|---|---|
| CN218039282U true CN218039282U (en) | 2022-12-13 |
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| CN202221893756.XU Active CN218039282U (en) | 2022-07-21 | 2022-07-21 | Negative pole piece and battery |
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| CN (1) | CN218039282U (en) |
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