CN210379259U - Positive plate for improving rate capability of lithium ion battery - Google Patents
Positive plate for improving rate capability of lithium ion battery Download PDFInfo
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- CN210379259U CN210379259U CN201921573754.0U CN201921573754U CN210379259U CN 210379259 U CN210379259 U CN 210379259U CN 201921573754 U CN201921573754 U CN 201921573754U CN 210379259 U CN210379259 U CN 210379259U
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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
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- 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 utility model provides a promote lithium ion battery rate performance's positive plate, the positive plate includes mass flow body, positive plate and aluminium net, the aluminium net is connected with the aluminium strip for the mass flow body, being provided with of aluminium net does benefit to the polarization and the impedance that reduce the positive plate, and then promotes battery rate discharge performance. Meanwhile, the loading capacity of the active substances of the positive electrode can be increased to a certain extent, and the energy density of the battery is improved. The utility model discloses a lithium ion battery positive plate easy operation, easily commercialization is showing to the problem effect that improves battery rate capability and solve high positive pole areal density impedance.
Description
Technical Field
The utility model belongs to the technical field of lithium ion battery, especially, relate to a promote positive plate of lithium ion battery rate capability.
Background
Electronic products which are mainly composed of an electric tool, an electronic cigarette, an unmanned aerial vehicle, a start-stop power supply and the like have high requirements on the rate capability of a lithium ion battery due to the requirement of rapid discharge. With the continuous development of the market and the improvement of the consumption concept of people, the energy density of the lithium ion battery is more and more required on the basis of meeting the high-rate discharge.
In order to improve the rate discharge performance of the lithium ion battery, on one hand, the conductivity of the anode material is improved through an anode formula and the like, and the impedance of an anode plate is reduced so as to reduce the polarization of the battery; on the other hand, the battery multiplying power discharge performance is improved by reducing the active material carrying capacity and the pole piece surface density, and the battery impedance and the battery polarization are reduced at the end.
However, the above methods are not favorable for increasing the energy density of the battery.
SUMMERY OF THE UTILITY MODEL
In order to improve the not enough of prior art, the utility model aims to provide a promote lithium ion battery multiplying power performance's positive plate, positive plate can greatly reduced pole piece surface impedance, improves lithium ion battery's multiplying power performance, can support higher positive active material's loading capacity simultaneously, improves positive plate areal density promptly to improve lithium ion battery body energy density, prepare the multiplying power performance and the energy density that the battery can be compromise to the positive plate that obtains promptly.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a positive plate comprises a current collector, an aluminum net and a positive layer;
the surface of one side or two sides of the current collector is provided with at least one layer of aluminum net and at least two layers of positive electrode layers, and the at least two layers of positive electrode layers and the at least one layer of aluminum net are sequentially and alternately arranged on the surface of the current collector.
According to the utility model discloses, at least two-layer positive pole layer with at least one deck aluminium net sets up in proper order in turn on the mass flow body surface according to the order of positive pole layer, aluminium net, … …, positive pole layer, and outmost being the positive pole layer.
According to the utility model discloses, mass flow body one side or both sides surface set up at least one deck aluminium net and at least two-layer positive plate, preferably both sides surface.
According to the utility model discloses, the surface of mass flow body one side or both sides sets up 1-10 layers of aluminium net and 2-11 positive layers, for example sets up 1-8 layers of aluminium net and 2-9 positive layers, for example sets up 1-6 layers of aluminium net and 2-7 positive layers, sets up 1-4 layers of aluminium net and 2-5 positive layers, for example sets up 1-3 layers of aluminium net and 2-4 positive layers, for example sets up 1-2 layers of aluminium net and 2-3 positive layers.
Illustratively, the positive plate comprises a current collector, an aluminum net, a positive layer X and a positive layer Y, wherein the positive layer X is arranged on the surface of one side or two sides of the current collector, the aluminum net is arranged on the surface of the positive layer X, and the positive layer Y is arranged on the surface of the aluminum net.
Exemplarily, the positive plate comprises a current collector, an aluminum mesh A, an aluminum mesh B, a positive layer X, a positive layer Y and a positive layer Z, wherein the positive layer X is arranged on the surface of one side or two sides of the current collector, the aluminum mesh A is arranged on the surface of the positive layer X, the positive layer Y is arranged on the surface of the aluminum mesh A, the aluminum mesh B is arranged on the surface of the positive layer Y, and the positive layer Z is arranged on the surface of the aluminum mesh B.
According to the utility model discloses, positive pole layer is obtained through the raw materials preparation including following component:
(a) 80-99.5 wt% of positive electrode active material; (b) 0-10 wt% of conductive agent; (c) 0.5-10 wt% of binder.
Illustratively, the additive amount of the positive electrode active material is 80 wt%, 81 wt%, 82 wt%, 83 wt%, 84 wt%, 85 wt%, 90 wt%, 95 wt%, 96 wt%, 96.5 wt%, 97 wt%, 97.2 wt%, 97.5 wt%, 97.8 wt%, 98 wt%, 98.2 wt%, 98.5 wt%, 99 wt%, 99.5 wt%;
illustratively, the conductive agent is added in an amount of 0.5 wt%, 1 wt%, 1.5 wt%, 2 t%, 3 wt%, 4 wt%, 5 wt%, 7 wt%, 10 wt%;
illustratively, the binder is added in an amount of 0.5 wt%, 0.8 wt%, 1 wt%, 1.5 wt%, 1.8 t%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 8 wt%, 10 wt%.
According to the utility model discloses, the positive pole active material is selected from at least one in lithium cobaltate, lithium manganate, lithium iron phosphate, NCM ternary material etc..
According to the utility model discloses, the conducting agent is selected from super P, carbon nanotube, carbon black etc. and can be used to in anodal conducting agent material one or more.
According to the utility model discloses, the binder is selected from one or several in positive pole binder materials such as SBR, PVDF for the lithium ion battery.
According to the utility model, the thickness of the positive electrode layer is 10-200 μm. For example, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm.
According to the utility model discloses, every layer of positive layer's thickness is the same or different, and for the preparation convenience, the preferred is the same.
According to the utility model discloses, the constitution of every anodal layer is the same or different, prepares promptly the anodal mixed slurry of every anodal layer can be the anodal mixed slurry of the same constitution and content, also can be the anodal mixed slurry of different constitution and content, the anodal mixed slurry of different constitution and content for example includes anodal active material or its content is different, conductive agent or its content is different, binder or at least one of its content difference is different.
According to the present invention, the current collector is selected from aluminum foil, for example, one of porous aluminum foil or etched aluminum foil.
According to the invention, the thickness of the current collector is 8-15 μm, for example 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm.
According to the invention, the mesh number of the aluminium mesh is 100 mesh to 1000 mesh, the thickness is 6 μm to 25 μm, such as 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm.
According to the utility model, the aluminum net and the current collector are connected by an aluminum strip (such as welding); the number of the aluminum strips can be one or more.
The utility model also provides a preparation method of above-mentioned positive plate, the method includes following step:
(1) coating a positive electrode layer on at least one side surface of the current collector;
(2) arranging an aluminum net on the surface of the positive electrode layer, and coating the positive electrode layer on the surface of the aluminum net;
(3) optionally repeating step (2) at least once, for example 1-10 times;
(4) and connecting the current collector with an aluminum net by using an aluminum tape to prepare the positive plate.
According to the utility model discloses, step (1) specifically is: and coating mixed slurry comprising a positive electrode active material, a conductive agent and a binder on at least one side surface of the current collector, and drying to prepare the positive electrode layer.
According to the utility model discloses, step (4) specifically do: and (3) welding the current collector with the aluminum mesh (all aluminum meshes) by using an aluminum strip to prepare the positive plate.
The utility model also provides an application of above-mentioned positive plate, it is used for preparing lithium ion battery.
The utility model also provides a lithium ion battery, lithium ion battery includes foretell positive plate.
According to the utility model discloses, lithium ion battery still includes negative pole piece, diaphragm and electrolyte.
The graphite, hard carbon, silicon and the like adopted by the negative plate can be used as conventional materials of the negative electrode of the lithium ion battery. The diaphragm and the electrolyte are both conventional materials for lithium ion batteries.
In the present invention, the applicant has unexpectedly found that the arrangement of at least one layer of aluminum mesh in the positive plate according to the present invention does not hinder lithium ions from entering into the electrolyte from, for example, at least two positive electrode layers, thereby ensuring the escape passage of lithium ions; on the other hand, after the aluminum net is connected with the current collector, the aluminum net is equivalent to the second layer of current collector, so that the polarization of the positive plate is greatly reduced, and meanwhile, the impedance of the positive plate is effectively reduced, so that the dynamic performance of the positive plate is improved; meanwhile, due to the existence of the double-layer current collector, the active material loading capacity of the whole positive plate can be increased, namely, the surface density of the positive plate is improved, so that the volume energy density of the battery is favorably improved.
The utility model has the advantages that:
the utility model provides a promote lithium ion battery rate performance's positive plate and preparation method and usage, the positive plate includes mass flow body, positive plate and aluminium net, the aluminium net is connected with the aluminium strip for the mass flow body, being provided with of aluminium net does benefit to polarization and the impedance that reduces the positive plate, and then promotes battery rate discharge performance. Meanwhile, the loading capacity of the active substances of the positive electrode can be increased to a certain extent, and the energy density of the battery is improved. The utility model discloses a lithium ion battery positive plate easy operation, easily commercialization is showing to the problem effect that improves battery rate capability and solve high positive pole areal density impedance.
Drawings
Fig. 1 is a front view of the positive plate of the present invention.
Fig. 2 is a top view of the positive plate of the present invention.
Fig. 3 is the pole piece impedance group obtained by the positive plate of the present invention.
Fig. 4 shows the discharge performance of the lithium ion battery made of the positive plate under different multiplying powers.
Reference numerals: 1 is a current collector; 2 is an aluminum strip connection point; 3 is an aluminum mesh; 4 is a positive electrode layer X; 5 is a positive electrode layer Y; and 6 is a positive electrode tab.
Detailed Description
The following will explain the preparation method of the present invention in detail with reference to specific examples. It is to be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention. All the technologies realized based on the above mentioned contents of the present invention are covered in the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
The aluminum mesh used in the following examples was selected from those having a mesh number of 500 and a thickness of 10 μm.
Comparative example 1
Preparing anode slurry:
adding 96.0 wt% of positive electrode active material lithium cobaltate, 2.0 wt% of binder PVDF, 2.0 wt% of conductive agent Super P and a certain amount of NMP into a planetary stirring tank, stirring for 5 hours at a stirring speed of revolution of 35Hz and dispersion of 1800Hz, and fully mixing to prepare positive electrode slurry with the discharge viscosity of 5000 mPa.s.
And coating the positive electrode slurry on the two side surfaces of the current collector layer with the thickness of 10 microns, and drying in a vacuum drying oven at 95 ℃ to obtain the positive electrode layer with the thickness of 150 microns of the single-side coating layer.
The negative active material of the selected negative plate is graphite, the diaphragm is a conventional substrate diaphragm for a lithium battery, and the electrolyte is commercial liquid electrolyte for the lithium battery.
And (3) preparing the positive plate, the negative plate and the diaphragm which are prepared by adopting a winding process and matching with liquid electrolyte to prepare the lithium ion battery.
Example 1
The other steps are the same as the comparative example 1, except that a layer of aluminum net is inserted into the positive electrode layer, and the total thickness of the positive electrode layer is not changed; namely, during coating, coating a positive electrode layer with the thickness of 75 mu m on the two side surfaces of the current collector, namely a positive electrode layer X, adding an aluminum net on the surface of the positive electrode layer X, and vacuum-baking for 2-4h at 95 ℃; then coating an anode layer named as an anode layer Y with the thickness of 75 microns on the aluminum net, welding the aluminum net and a current collector together by using an aluminum tape, and baking for 8 hours in vacuum at 95 ℃ to obtain an anode plate, wherein as shown in figure 1, an anode layer X5, an aluminum net 3 and an anode layer Y5 are respectively arranged on two sides of the current collector 1; and the aluminum net 3 is connected with the current collector 1 through the aluminum strip connection point 2, and the anode further comprises an anode tab 6.
Example 2
The other steps are the same as the comparative example 1, except that a layer of aluminum net is inserted into the positive electrode layer, and the total thickness of the positive electrode layer is thickened; namely, during coating, coating a layer of positive electrode layer with the thickness of 80 mu m on the two side surfaces of the current collector, namely a positive electrode layer X, adding an aluminum net on the surface of the positive electrode layer X, and vacuum-baking for 2-4h at 95 ℃; and then coating an anode layer with the thickness of 80 mu m on the aluminum net, namely an anode layer Y, welding the aluminum net and a current collector together by using an aluminum strip, and baking for 8 hours in vacuum at 95 ℃ to obtain the anode plate.
Example 3
The other steps are the same as the comparative example 1, except that a layer of aluminum net is inserted into the positive electrode layer, and the total thickness of the positive electrode layer is thickened; namely, during coating, coating a positive electrode layer with the thickness of 85 microns on the two side surfaces of the current collector, namely a positive electrode layer X, adding an aluminum net on the surface of the positive electrode layer X, and vacuum-baking for 2-4h at 95 ℃; and then coating an anode layer with the thickness of 85 microns on the aluminum net, namely an anode layer Y, welding the aluminum net and a current collector together by using an aluminum strip, and baking for 8 hours at 95 ℃ in vacuum to obtain the anode plate.
Example 4
The other parts are the same as the comparative example 1, except that two layers of aluminum nets are inserted into the positive electrode layer, and the total thickness of the positive electrode layer is the same as the comparative example 1; namely, during coating, coating a positive electrode layer with the thickness of 50 mu m on the two side surfaces of the current collector, namely a positive electrode layer X, adding an aluminum net A on the surface of the positive electrode layer X, and vacuum-baking for 2-4h at 95 ℃; then coating a positive electrode layer named as a positive electrode layer Y with the thickness of 50 microns on the aluminum mesh A, adding a layer of aluminum mesh B on the surface of the positive electrode layer Y, and carrying out vacuum baking for 2-4h at 95 ℃; and coating a positive electrode layer with the thickness of 50 microns on the surface of the aluminum mesh B, namely a positive electrode layer Z, welding the aluminum mesh A, the aluminum mesh B and a current collector together by using an aluminum strip, and baking for 8 hours at 95 ℃ in vacuum to obtain the positive electrode plate.
The positive electrode sheets obtained in comparative example 1 and examples 1 to 4 were subjected to a sheet resistance test (test using a four-probe tester) under the same conditions, and the data are shown in fig. 3. Meanwhile, the lithium ion batteries prepared from the positive electrode sheets of comparative example 1 and examples 1 to 4 were subjected to discharge performance tests under different rate conditions, as shown in fig. 4.
The discharge performance test comprises the steps of fully charging the battery at a constant current and a constant voltage, and then discharging the battery at a current of 0.2C to obtain the battery capacity under the discharge of 0.2C; the test conditions of other multiplying power discharge are the same as above, and the difference is that the discharge current is different; and obtaining the discharge performance data under different multiplying power conditions according to the ratio of the battery capacity under different multiplying power discharge to the battery capacity under 0.2C multiplying power.
The test result shown in fig. 3 shows that, with the positive plate of the present invention, the pole piece impedance is smaller, when the thickness of the positive plate coating increases, the pole piece impedance increases, but still has advantages over the comparative example, which shows that the positive plate of the present invention supports higher positive active material loading capacity, improves the surface density of the positive plate, and is favorable for improving the energy density of the battery; two layers of aluminum nets are added, the pole piece impedance is reduced more obviously, and the introduction of the multiple layers of aluminum nets can reduce the pole piece impedance better, so that the polarization of the battery is reduced, and the cycle performance of the battery is improved.
The test result that figure 4 shows, adopts the utility model discloses a lithium ion battery that positive plate made has better multiplying power discharge performance, to electric tool, open the direction that has big multiplying power discharge performance demand such as stop the power, has apparent advantage.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A positive plate for improving the rate capability of a lithium ion battery is disclosed, wherein the positive plate comprises a current collector, an aluminum net and a positive plate layer;
the surface of one side or two sides of the current collector is provided with at least one layer of aluminum net and at least two layers of positive electrode layers, and the at least two layers of positive electrode layers and the at least one layer of aluminum net are sequentially and alternately arranged on the surface of the current collector; the at least two anode layers and the at least one aluminum net are sequentially and alternately arranged on the surface of the current collector according to the order of the anode layers, the aluminum net, … … and the anode layers, and the outermost layer is the anode layer;
the aluminum net is connected with the current collector through an aluminum strip; the number of the aluminum strips is one or more;
the thickness of the positive electrode layer is 10-200 μm; the mesh number of the aluminum mesh is 100 meshes-1000 meshes, and the thickness of the aluminum mesh is 6 mu m-25 mu m.
2. The positive electrode sheet according to claim 1, wherein 1-10 layers of aluminum mesh and 2-11 layers of positive electrode layer are provided on one or both surfaces of the current collector.
3. The positive electrode sheet according to claim 2, wherein 1-8 layers of aluminum mesh and 2-9 layers of positive electrode layer are provided on one or both surfaces of the current collector.
4. The positive electrode sheet according to claim 3, wherein 1-6 aluminum mesh layers and 2-7 positive electrode layers are provided on one or both surfaces of the current collector.
5. The positive electrode sheet according to claim 4, wherein 1-4 layers of aluminum mesh and 2-5 layers of positive electrode layer are provided on one or both surfaces of the current collector.
6. The positive electrode sheet according to claim 5, wherein 1-3 aluminum mesh layers and 2-4 positive electrode layers are provided on one or both surfaces of the current collector.
7. The positive electrode sheet according to claim 6, wherein 1-2 aluminum mesh layers and 2-3 positive electrode layers are provided on one or both surfaces of the current collector.
8. The positive plate according to claim 7, wherein the positive plate comprises a current collector, an aluminum mesh, a positive layer X and a positive layer Y, the positive layer X is arranged on one or two surfaces of the current collector, the aluminum mesh is arranged on the surface of the positive layer X, and the positive layer Y is arranged on the surface of the aluminum mesh.
9. The positive plate according to claim 7, wherein the positive plate comprises a current collector, an aluminum mesh A, an aluminum mesh B, a positive layer X, a positive layer Y and a positive layer Z, the positive layer X is arranged on one side or two sides of the current collector, the aluminum mesh A is arranged on the surface of the positive layer X, the positive layer Y is arranged on the surface of the aluminum mesh A, the aluminum mesh B is arranged on the surface of the positive layer Y, and the positive layer Z is arranged on the surface of the aluminum mesh B.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921573754.0U CN210379259U (en) | 2019-09-20 | 2019-09-20 | Positive plate for improving rate capability of lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921573754.0U CN210379259U (en) | 2019-09-20 | 2019-09-20 | Positive plate for improving rate capability of lithium ion battery |
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| CN210379259U true CN210379259U (en) | 2020-04-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114447274A (en) * | 2022-02-11 | 2022-05-06 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
| CN115528211A (en) * | 2022-10-19 | 2022-12-27 | 源拓微电科技(宁波)有限公司 | Pole piece for lithium ion battery and lithium ion battery |
-
2019
- 2019-09-20 CN CN201921573754.0U patent/CN210379259U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114447274A (en) * | 2022-02-11 | 2022-05-06 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
| CN115528211A (en) * | 2022-10-19 | 2022-12-27 | 源拓微电科技(宁波)有限公司 | Pole piece for lithium ion battery and lithium ion battery |
| CN115528211B (en) * | 2022-10-19 | 2024-03-29 | 源拓微电科技(宁波)有限公司 | Pole piece for lithium ion battery and lithium ion battery |
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Address after: 519180 No. 209 Pearl Peak Avenue, Jingan Town, Doumen District, Zhuhai City, Guangdong Province Patentee after: Zhuhai Guanyu Battery Co., Ltd Address before: 519180 No. 209 Pearl Peak Avenue, Jingan Town, Doumen District, Zhuhai City, Guangdong Province Patentee before: ZHUHAI COSLIGHT BATTERY Co.,Ltd. |