CN210379260U - Negative plate for improving quick charging capability of lithium ion battery - Google Patents
Negative plate for improving quick charging capability of lithium ion battery Download PDFInfo
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- CN210379260U CN210379260U CN201921573757.4U CN201921573757U CN210379260U CN 210379260 U CN210379260 U CN 210379260U CN 201921573757 U CN201921573757 U CN 201921573757U CN 210379260 U CN210379260 U CN 210379260U
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 36
- 238000007600 charging Methods 0.000 title description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000010949 copper Substances 0.000 claims abstract description 89
- 229910052802 copper Inorganic materials 0.000 claims abstract description 89
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 14
- 239000011149 active material Substances 0.000 abstract description 6
- 230000010287 polarization Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000011068 loading method Methods 0.000 abstract description 4
- 238000011049 filling Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 116
- 239000011248 coating agent Substances 0.000 description 19
- 238000000576 coating method Methods 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000002562 thickening agent Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010277 constant-current charging Methods 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910021385 hard carbon Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011244 liquid electrolyte Substances 0.000 description 2
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000011366 tin-based material Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The utility model provides a promote negative pole piece of lithium ion battery ability of filling soon, the negative pole piece includes mass flow body, negative pole layer and copper mesh, the copper mesh is connected with the nickel strap for the mass flow body, the setting up of copper mesh has shortened the distance that lithium ion takes off the inlay at the negative pole layer to the polarization of negative pole piece has been reduced, thereby has promoted the dynamic behavior of negative pole piece. Meanwhile, the loading capacity of the active material of the negative 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 negative pole piece easy operation, easily commercialization is shown to improving the battery and filling the ability soon and solving the not enough problem effect of high negative pole face density dynamics.
Description
Technical Field
The utility model belongs to the technical field of lithium ion battery, especially, relate to a promote negative pole piece of lithium ion battery quick charge ability.
Background
With the continuous popularization of digital products, lithium ion batteries are rapidly developed. Nowadays, people have higher and higher demands on consumer electronics, especially mobile phones, notebook computers and electric vehicles, and the requirements on energy density and charging speed of lithium ion batteries are higher and higher, which brings great challenges to the lithium ion batteries.
In order to improve the energy density of lithium ion batteries, measures generally adopted by various battery manufacturers are as follows: on one hand, a high-capacity negative electrode such as a silicon negative electrode is sought, but the problems of low first charge efficiency, short cycle life, large cycle expansion and the like of the silicon negative electrode are difficult to solve, and the silicon negative electrode is difficult to support rapid charge due to the problem of poor conductivity; on the other hand, the graphite compaction density is further improved, and the problem is that the dynamic performance is sharply reduced under the condition of high graphite compaction density; on the other hand, the coating thickness of the pole piece is increased, namely the loading of active substances is increased, and the method easily causes the problems of increased polarization and serious insufficient dynamics of the battery.
Therefore, it is a primary task of battery manufacturers to solve the rapid charging performance at high energy density of batteries.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a negative plate for improving the quick charging capability of a lithium ion battery, which comprises a current collector, a copper net and a negative layer; at least one layer of copper net and at least two layers of negative electrode layers are arranged on the surface of one side or two sides of the current collector, and the at least two layers of negative electrode layers and the at least one layer of copper net are sequentially arranged on the surface of the current collector. The negative plate can shorten the embedding path of lithium ions in the negative plate, reduce polarization, improve the dynamics of the negative plate under high surface density, and further improve the volume energy density of the battery under a quick charging system.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a negative plate comprises a current collector, a copper net and a negative layer;
at least one layer of copper net and at least two layers of negative electrode layers are arranged on the surface of one side or two sides of the current collector, and the at least two layers of negative electrode layers and the at least one layer of copper net are sequentially and alternately arranged on the surface of the current collector.
According to the utility model discloses, at least two-layer negative pole layer with at least one deck copper mesh sets up in proper order in turn on the mass flow body surface according to the order of negative pole layer, copper mesh, … …, negative pole layer, and outmost negative pole layer that is.
According to the utility model discloses, mass flow body one side or both sides surface set up at least one deck copper mesh and at least two-layer negative pole layer, preferably both sides surface.
According to the utility model discloses, the current collector one side or both sides surface sets up 1-10 layers copper net and 2-11 layers of negative pole layer, for example sets up 1-8 layers copper net and 2-9 layers of negative pole layer, for example sets up 1-6 layers copper net and 2-7 layers of negative pole layer, sets up 1-4 layers copper net and 2-5 layers of negative pole layer, for example sets up 1-3 layers copper net and 2-4 layers of negative pole layer, for example sets up 1-2 layers copper net and 2-3 layers of negative pole layer.
Exemplarily, the negative pole piece includes current collector, copper mesh, negative pole layer X and negative pole layer Y, current collector one side or both sides surface sets up negative pole layer X, negative pole layer X surface sets up the copper mesh, the copper mesh surface sets up negative pole layer Y.
Exemplarily, the negative pole piece includes current collector, copper mesh A, copper mesh B, negative pole layer X, negative pole layer Y and negative pole layer Z, current collector one side or both sides surface set up negative pole layer X, negative pole layer X surface sets up copper mesh A, copper mesh A surface sets up negative pole layer Y, negative pole layer Y surface sets up copper mesh B, copper mesh B surface sets up negative pole layer Z.
According to the utility model discloses, the negative pole layer is obtained through the raw materials preparation including following component:
(a) 70-99.95 wt% of negative electrode active material; (b) 0-10 wt% of conductive agent; (c) 0.05 to 10 weight percent of binder; (d) 0-10 wt% of thickening agent.
Illustratively, the amount of the anode active material added is 70 wt%, 71 wt%, 72 wt%, 73 wt%, 74 wt%, 75 wt%, 80 wt%, 85 wt%, 90 wt%, 95 wt%, 96 wt%, 96.4 wt%, 96.9 wt%, 97.0 wt%, 97.2 wt%, 97.4 wt%, 97.5 wt%, 97.8 wt%, 98 wt%, 98.2 wt%, 99 wt%, 99.5 wt%;
illustratively, the conductive agent is added in an amount of 0 wt%, 0.2 wt%, 0.5 wt%, 1 wt%, 1.5 wt%, 2 t%, 3 wt%, 4 wt%, 5 wt%, 10 wt%;
illustratively, the binder is added in an amount of 0.05 wt%, 0.1 wt%, 0.2 wt%, 0.5 wt%, 0.8 wt%, 1 wt%, 1.3 wt%, 1.5 wt%, 1.8 t%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 8 wt%, 10 wt%.
Illustratively, the thickener is added in an amount of 0 wt%, 0.05 wt%, 0.1 wt%, 0.2 wt%, 0.5 wt%, 0.8 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 8 wt%, 10 wt%.
According to the present invention, the negative active material is selected from at least one of graphite, hard carbon, soft carbon, silicon-based material, tin-based material, graphene, and the like.
According to the utility model discloses, the conducting agent is selected from super P, carbon nanotube, carbon black etc. and can be used to one or several in the negative pole conducting agent material.
According to the utility model, the binder is selected from one or more of SBR, PAA-Li, PAA-Na, PVDF and other binder materials for lithium ion batteries.
According to the utility model discloses, thickener is selected from one or several of lithium ion battery thickener materials such as CMC-Na, CMC-Li.
According to the utility model, the thickness of the negative 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 present invention, the thickness of each negative electrode layer is the same or different, and preferably the same for the convenience of preparation.
According to the utility model discloses, every layer of negative pole layer's constitution is the same or different, prepares promptly every layer of negative pole layer's negative pole mixes the thick liquids can be the negative pole of the same constitution and content and mixes the thick liquids, also can be the negative pole of different constitutions and content and mixes the thick liquids, the negative pole of different constitutions and content mixes the thick liquids including negative pole active material or its content difference, conducting agent or its content difference, binder or its content difference in at least one of different for example.
According to the present invention, the current collector is selected from copper foil, for example, one of porous copper foil or etched copper foil.
According to the invention, the thickness of the current collector is 4-25 μm, for example 4 μm, 5 μm, 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 invention, the mesh number of the copper mesh is 100 mesh to 1000 mesh, and the thickness is 4 μm to 20 μm, such as 4 μm, 5 μm, 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.
According to the utility model, the copper mesh and the current collector are connected by a nickel strap (such as welding); the number of the nickel strips can be one or more.
The utility model also provides a preparation method of above-mentioned negative pole piece, the method includes following step:
(1) coating a negative electrode layer on at least one side surface of the current collector;
(2) arranging a copper mesh on the surface of the negative electrode layer, and coating the negative electrode layer on the surface of the copper mesh;
(3) optionally repeating step (2) at least once, for example 1-10 times;
(4) and connecting the current collector with a copper net by using a nickel strap to prepare the negative plate.
According to the utility model discloses, step (1) specifically is: and coating mixed slurry comprising a negative electrode active material, a conductive agent, a binder and a thickening agent on at least one side surface of the current collector, drying and preparing the negative electrode layer.
According to the utility model discloses, step (4) specifically do: and welding the current collector with the copper mesh (all copper meshes) by using a nickel band to prepare the negative plate.
The utility model also provides an application of above-mentioned negative pole piece, it is used for preparing lithium ion battery.
The utility model also provides a lithium ion battery, lithium ion battery includes foretell negative pole piece.
According to the utility model discloses, lithium ion battery still includes positive plate, 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 copper mesh in the negative electrode sheet according to the present invention does not hinder lithium ions from entering into the electrolyte from, for example, at least two layers of negative electrode layers, thereby ensuring the escape channel of lithium ions; on the other hand, after the copper mesh is connected with the current collector, the copper mesh is equivalent to a second layer of current collector, so that the distance of lithium ions in the negative electrode layer is shortened, and the polarization of the negative electrode plate is reduced, thereby improving the dynamic performance of the negative electrode plate; meanwhile, due to the existence of the double-layer current collectors, the active material loading capacity of the whole negative plate can be increased, namely the surface density of the negative 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 and fill negative pole piece of ability soon and preparation method and usage, the negative pole piece includes mass flow body, negative pole layer and copper mesh, the copper mesh is connected with the nickel strap for the mass flow body, the setting up of copper mesh has shortened the distance that lithium ion is in negative pole layer disequilibrium to the polarization of negative pole piece has been reduced, thereby has promoted the dynamic behavior of negative pole piece. Meanwhile, the loading capacity of the active material of the negative 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 negative pole piece easy operation, easily commercialization is shown to improving the battery and filling the ability soon and solving the not enough problem effect of high negative pole face density dynamics.
Drawings
Fig. 1 is a front view of the negative electrode sheet of the present invention.
Fig. 2 is a plan view of the negative electrode sheet of the present invention.
Fig. 3 shows the discharge performance of the lithium ion battery made of the negative plate of the present invention under different multiplying powers.
Reference numerals: 1 is a current collector; 2 is a nickel strap connection point; 3 is a copper mesh; 4 is a negative electrode layer X; 5 is a negative electrode layer Y; and 6 is a negative 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 copper mesh used in the examples described below was selected from those having a mesh size of 500 mesh and a thickness of 10 μm.
Comparative example 1
Preparing anode slurry:
adding 95.0 wt% of negative active material graphite, 2.0 wt% of binder SBR, 2.0 wt% of thickener CMC-Na, 1.0 wt% of conductive agent Super P and a certain amount of deionized water into a planetary stirring tank, stirring for 8 hours at a stirring speed of revolution of 35Hz and dispersion of 1500Hz, and fully mixing to prepare negative slurry with the discharge viscosity of 5000 mPa.s.
And coating the negative electrode slurry on the two side surfaces of the current collector layer with the thickness of 6 microns, and drying in a vacuum drying oven at 90 ℃ to obtain the negative electrode layer with the thickness of 120 microns on the single-side coating layer.
The positive active substance of the selected positive plate is lithium cobaltate, the diaphragm is a conventional base material diaphragm for a lithium battery, and the electrolyte is commercial liquid electrolyte for the lithium ion battery.
And (3) preparing the negative plate, the positive 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 parts are the same as the comparative example 1, except that a layer of copper mesh is inserted into the negative electrode layer, and the total thickness of the negative electrode layer is not changed; namely, during coating, coating a layer of negative electrode layer with the thickness of 60 mu m on the two side surfaces of the current collector, namely a negative electrode layer X, adding a layer of copper mesh on the surface of the negative electrode layer X, and baking for 2-4h at the temperature of 85 ℃ in vacuum; then coating a negative electrode layer named as a negative electrode layer Y with the thickness of 60 mu m on the copper mesh, welding the copper mesh and the current collector together by using a nickel strip, and baking for 8 hours in vacuum at 90 ℃ to obtain a negative electrode sheet, wherein as shown in figure 1, the negative electrode layer X5, the copper mesh 3 and the negative electrode 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 nickel strip connection point 2, and the negative pole further comprises a negative pole lug 6.
Example 2
The other parts are the same as the comparative example 1, except that a layer of copper mesh is inserted into the negative electrode layer, and the total thickness of the negative electrode layer is thickened; namely, during coating, coating a negative electrode layer with the thickness of 70 mu m on the two side surfaces of the current collector, namely a negative electrode layer X, adding a copper net on the surface of the negative electrode layer X, and baking for 2-4h at 85 ℃ in vacuum; and then coating a negative electrode layer named as a negative electrode layer Y with the thickness of 70 microns on the copper mesh, welding the copper mesh and a current collector together by using a nickel strip, and baking for 8 hours at 90 ℃ in vacuum to obtain the negative electrode plate.
Example 3
The other parts are the same as the comparative example 1, except that a layer of copper mesh is inserted into the negative electrode layer, and the total thickness of the negative electrode layer is thickened; namely, during coating, coating a negative electrode layer with the thickness of 80 mu m on the two side surfaces of the current collector, namely a negative electrode layer X, adding a copper net on the surface of the negative electrode layer X, and baking for 2-4h at 85 ℃ in vacuum; and then coating a negative electrode layer named as a negative electrode layer Y with the thickness of 80 microns on the copper mesh, welding the copper mesh and a current collector together by using a nickel strip, and baking for 8 hours at 90 ℃ in vacuum to obtain the negative electrode plate.
Example 4
The other parts are the same as the comparative example 1, except that two layers of copper nets are inserted into the negative electrode layer, and the total thickness of the negative electrode layer is the same as the comparative example 1; namely, during coating, coating a negative electrode layer with the thickness of 40 mu m on the surfaces of two sides of a current collector, namely a negative electrode layer X, adding a copper mesh A on the surface of the negative electrode layer X, and baking for 2-4h at 85 ℃ in vacuum; then coating a negative electrode layer named as a negative electrode layer Y with the thickness of 40 mu m on the copper mesh A, adding a copper mesh B on the surface of the negative electrode layer Y, and baking for 2-4h in vacuum at 85 ℃; and coating a negative electrode layer with the thickness of 40 mu m on the surface of the copper mesh B, namely a negative electrode layer Z, welding the copper mesh A, the copper mesh B and a current collector together by using a nickel strip, and baking for 8 hours at 90 ℃ in vacuum to obtain the negative electrode plate.
The lithium ion batteries prepared in the comparative example 1 and the examples 1 to 4 are subjected to different rate performance tests to obtain a constant current charging ratio curve, namely a constant current charging ratio curve, which is a curve of the ratio of the capacity of the battery in the constant current stage to the total capacity of the battery under different rate charging, and is shown in fig. 3; meanwhile, the lithium ion batteries prepared in comparative example 1 and examples 1 to 4 were subjected to a normal temperature charging lithium deposition window test to obtain the data shown in table 1 below.
TABLE 1 results of the room-temperature charging lithium deposition window test of the lithium ion batteries prepared in comparative example 1 and examples 1 to 4
The test result of table 1 shows that, the lithium ion battery that adopts the negative pole piece of the method of the utility model to make compares the lithium ion battery that the conventional pole piece of comparative example 1 made, and it is wideer to separate out the lithium window, can support the charging of bigger multiplying power. As can be seen from table 1, compared with comparative example 1, the negative plate of the present invention has the advantages that the one-layer copper mesh is added, the lithium separation window of the battery can be greatly improved, and the two-layer copper mesh is added, so that the effect is more obvious; in addition, the utility model discloses a negative pole piece can support thicker negative pole coating under the same lithium window of separating out, supports higher active material load promptly.
As shown in fig. 3, the utility model discloses a battery constant current stage's that negative pole piece made capacity account for the proportion of battery total charging capacity is higher, and the constant current fills to be than the index of weighing the battery and fill the ability fast, and the charge speed of battery mainly depends on the ratio of constant current charging stage capacity, and the constant current fills to be higher than, and the battery fills the ability better, and the time that the battery is full of capacity is also shorter; the test result of fig. 3 shows, the utility model discloses a negative pole piece adds the copper mesh and can improves the battery constant current and fill than, and the active material capacity improves, and still the effect is obvious, and increases the copper mesh number of piles, and improvement constant current that can be better fills than.
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 negative plate for improving the quick charge capacity of a lithium ion battery comprises a current collector, a copper mesh and a negative layer;
at least one layer of copper net and at least two layers of negative electrode layers are arranged on the surface of one side or two sides of the current collector, and the at least two layers of negative electrode layers and the at least one layer of copper net are sequentially and alternately arranged on the surface of the current collector; the at least two negative electrode layers and the at least one copper net are sequentially and alternately arranged on the surface of the current collector according to the sequence of the negative electrode layers, the copper net, … … and the negative electrode layers, and the outermost layer is the negative electrode layer;
the thickness of the negative electrode layer is 10-200 μm; the mesh number of the copper mesh is 100 meshes-1000 meshes, and the thickness of the copper mesh is 4 mu m-20 mu m; the copper net is connected with the current collector by a nickel belt; the number of the nickel strips is one or more.
2. The negative electrode sheet according to claim 1, wherein the surface of one or both sides of the current collector is provided with 1-10 copper meshes and 2-11 negative electrode layers.
3. The negative electrode sheet according to claim 2, wherein the current collector is provided with 1-8 copper meshes and 2-9 negative electrode layers on one or both surfaces.
4. The negative electrode sheet according to claim 3, wherein the current collector is provided with 1-6 copper meshes and 2-7 negative electrode layers on one or both surfaces.
5. The negative electrode sheet according to claim 4, wherein the current collector is provided with 1-4 copper meshes and 2-5 negative electrode layers on one or both surfaces.
6. The negative electrode sheet according to claim 5, wherein one or both surfaces of the current collector are provided with 1-3 copper meshes and 2-4 negative electrode layers.
7. The negative electrode sheet according to claim 6, wherein one or both surfaces of the current collector are provided with 1-2 copper meshes and 2-3 negative electrode layers.
8. The negative plate of claim 7, wherein the negative plate comprises a current collector, a copper mesh, a negative layer X and a negative layer Y, wherein the negative layer X is arranged on one or two surfaces of the current collector, the copper mesh is arranged on the surface of the negative layer X, and the negative layer Y is arranged on the surface of the copper mesh.
9. The negative plate of claim 7, wherein the negative plate comprises a current collector, a copper mesh A, a copper mesh B, a negative layer X, a negative layer Y and a negative layer Z, wherein the negative layer X is arranged on one side or two sides of the current collector, the copper mesh A is arranged on the surface of the negative layer X, the negative layer Y is arranged on the surface of the copper mesh A, the copper mesh B is arranged on the surface of the negative layer Y, and the negative layer Z is arranged on the surface of the copper mesh B.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921573757.4U CN210379260U (en) | 2019-09-20 | 2019-09-20 | Negative plate for improving quick charging capability of lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921573757.4U CN210379260U (en) | 2019-09-20 | 2019-09-20 | Negative plate for improving quick charging capability of lithium ion battery |
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| CN210379260U true CN210379260U (en) | 2020-04-21 |
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| CN201921573757.4U Active CN210379260U (en) | 2019-09-20 | 2019-09-20 | Negative plate for improving quick charging capability of 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 CosMX 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. |