CN114497439A - Negative plate and battery comprising same - Google Patents
Negative plate and battery comprising same Download PDFInfo
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- CN114497439A CN114497439A CN202210015457.4A CN202210015457A CN114497439A CN 114497439 A CN114497439 A CN 114497439A CN 202210015457 A CN202210015457 A CN 202210015457A CN 114497439 A CN114497439 A CN 114497439A
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- negative electrode
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- 239000011248 coating agent Substances 0.000 claims abstract description 49
- 238000000576 coating method Methods 0.000 claims abstract description 49
- 239000003792 electrolyte Substances 0.000 claims abstract description 24
- 239000011149 active material Substances 0.000 claims abstract description 16
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 12
- 239000013589 supplement Substances 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims description 13
- 239000006258 conductive agent Substances 0.000 claims description 13
- 239000007773 negative electrode material Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 2
- NRJJZXGPUXHHTC-UHFFFAOYSA-N [Li+].[O--].[O--].[O--].[O--].[Zr+4].[La+3] Chemical compound [Li+].[O--].[O--].[O--].[O--].[Zr+4].[La+3] NRJJZXGPUXHHTC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- 229910052788 barium Inorganic materials 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 229910052733 gallium Inorganic materials 0.000 claims description 2
- 229910021385 hard carbon Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229910021384 soft carbon Inorganic materials 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 claims 1
- 230000010287 polarization Effects 0.000 abstract description 5
- 239000007791 liquid phase Substances 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002033 PVDF binder Substances 0.000 description 4
- 239000013543 active substance Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 239000011267 electrode slurry Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000006182 cathode active material Substances 0.000 description 2
- 239000006257 cathode slurry Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910002984 Li7La3Zr2O12 Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 230000022131 cell cycle Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920005553 polystyrene-acrylate Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- -1 silicon oxy compound Chemical class 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
- H01M10/0562—Solid materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0068—Solid electrolytes inorganic
- H01M2300/0071—Oxides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a negative plate and a battery comprising the same, wherein the negative plate comprises a current collector, a first coating area arranged on at least one side surface of the current collector, and a second coating area connected with the first coating area and positioned on the periphery of the first coating area; an active material layer is arranged in the first coating area; an electrolyte supplement layer is arranged in the second coating area, the electrolyte supplement layer comprises solid electrolyte, the use of the negative plate improves the cycle performance of the battery under the condition of high multiplying power, and the calculation of an electrochemical theory shows that in the electrode plate, the edge Li of the electrode plate is arranged in the electrode plate+Low concentration, affecting liquid phase polarization, and is replenished by applying electrolyte in the edge region (i.e., second coated region) in the present inventionLayer, replenishment of edge-consuming Li+Improving the edge Li of the pole piece+The concentration polarization is large, and the edge dynamic performance is improved.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a negative plate and a battery comprising the same.
Background
With the development of lithium ion secondary batteries, consumers have increasingly high demands on charging speed, endurance time, and safety performance. However, as the charging rate increases, problems such as lithium deposition at the negative electrode edge tend to occur in the case of high-rate charging.
Disclosure of Invention
In order to overcome the defects of the prior art, the inventionThe invention provides a negative plate and a battery comprising the same, wherein the negative plate can improve the edge of a pole piece due to liquid-phase Li+Insufficient concentration, leading to marginal lithium precipitation problems.
The purpose of the invention is realized by the following technical scheme:
a negative plate comprises a current collector, a first coating area arranged on at least one side surface of the current collector, and a second coating area connected with the first coating area and positioned at the periphery of the first coating area;
an active material layer is arranged in the first coating area;
an electrolyte replenishment layer is disposed within the second coated region, the electrolyte replenishment layer including a solid electrolyte.
According to embodiments of the present invention, providing the electrolyte replenishing layer in the second coating region may provide consumed Li+Improving the edge area (i.e., second coated area) Li of the pole piece+The concentration polarization is large.
According to an embodiment of the invention, the solid-state electrolyte is a garnet-type solid-state electrolyte. Illustratively, the garnet-type solid electrolyte is selected from a doped or undoped lithium lanthanum zirconium oxide electrolyte, wherein the doping element is selected from at least one of Al, Ga, Fe, Ge, Ca, Ba, Sr, Y, Nb, Ta, W, Sb elements; preferably, the garnet-type solid electrolyte is selected from Li7-mLa3Zr2-mTamO12(0≤m≤0.6)、Li7-yLa3Zr2-yNbyO12(y is 0. ltoreq. y.ltoreq.0.6) and Li6.4-pLa3Zr2- pTapAl0.2O12(0.2. ltoreq. p. ltoreq.0.5), illustratively, the garnet-type solid electrolyte is selected from Li7La3Zr2O12(LLZO)。
According to an embodiment of the present invention, the active material layer includes an anode active material.
According to an embodiment of the present invention, the negative electrode active material is selected from one or more of graphite, hard carbon, soft carbon, silicon oxy compound, silicon carbon compound.
According to an embodiment of the present invention, the particle diameter Dv50 of the negative electrode active material is 5 μm to 25 μm, for example, 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, or any point in the range consisting of two of the above points.
According to the embodiment of the invention, the area ratio of the first coating area to the second coating area is 100 (0.5-5).
According to an embodiment of the present invention, the width of the first coated region is 10mm to 250 mm.
According to an embodiment of the invention, the width of the second coated area is 0.5mm to 10mm, preferably 1mm to 3 mm.
In the present invention, the second coating region is located at the periphery of the first coating region, the second coating region is substantially the edge region of the negative electrode tab, and the width of the second coating region refers to the difference between the width of the current collector and the width of the first coating region, i.e., the sum of the widths of the edge regions located at both sides of the first coating region, as shown in fig. 1.
According to an embodiment of the present invention, the thickness of the electrolyte supplement layer and the thickness of the active material layer are the same or different.
According to an embodiment of the present invention, the thickness of the active material layer is 10 μm to 50 μm.
According to an embodiment of the present invention, the electrolyte supplement layer has a thickness of 10 to 50 μm.
According to an embodiment of the present invention, the active material layer further includes a first conductive agent and a first binder.
According to an embodiment of the present invention, the electrolyte supplement layer further includes a second conductive agent and a second binder.
According to an embodiment of the present invention, the first conductive agent and the second conductive agent are the same or different and are independently selected from at least one of conductive carbon black, acetylene black, ketjen black, conductive graphite, conductive carbon fiber, carbon nanotube, and metal powder.
According to an embodiment of the present invention, the first binder and the second binder are the same or different and are independently selected from at least one of Styrene Butadiene Rubber (SBR), polyvinylidene fluoride (PVDF), polyacrylonitrile, polystyrene-acrylate, polyacrylate.
According to the embodiment of the invention, the active material layer comprises the following components in percentage by mass: 90-99 wt% of a negative electrode active material, 0.5-10 wt% of a first conductive agent, and 0.5-10 wt% of a first binder.
Preferably, the active material layer comprises the following components in percentage by mass:
92-99 wt% of negative electrode active material, 0.5-4 wt% of first conductive agent, and 0.5-4 wt% of first binder.
According to the embodiment of the invention, the electrolyte supplement layer comprises the following components in percentage by mass: 70-99 wt% of solid electrolyte, 0.5-10 wt% of second conductive agent and 0.5-20 wt% of second binder.
Preferably, the active material layer comprises the following components in percentage by mass:
80-99 wt% of solid electrolyte, 0.5-10 wt% of second conductive agent and 0.5-15 wt% of second binder.
The invention also provides a preparation method of the negative plate, which comprises the following steps:
1) preparing slurry for forming an active material layer and slurry for forming an electrolyte supplement layer respectively;
2) and coating the slurry for forming an active material layer and the slurry for forming an electrolyte supplement layer on the two side surfaces of the current collector by using a double-layer coating machine, wherein the electrolyte supplement layer is coated on a first coating area, the active material layer is coated on a second coating area which is connected with the first coating area and is positioned at the periphery of the first coating area, and the negative plate is prepared.
The invention also provides a battery, which comprises the negative plate.
The invention has the beneficial effects that:
the invention provides a negative plate and a battery comprising the same, wherein the use of the negative plate improves the cycle performance of the battery under a high-rate condition, and Li is arranged at the edge of the negative plate in an electrode plate by calculation of an electrochemical theory+Low concentration, affecting liquid phase polarization, and in the present invention, the edge-consumed Li is replenished by coating the edge region (i.e., the second coated region) with an electrolyte replenishing layer+Improving the edge Li of the pole piece+The problem of large concentration polarization is solved, and the edge dynamic performance is improved.
Drawings
Fig. 1 is a schematic structural diagram of a negative electrode sheet according to a preferred embodiment of the present invention;
reference numerals: 1 is a first coated area; and 2 is a second coating region.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present 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.
Example 1
(1) Preparing cathode slurry by taking graphite as a cathode active material: mixing and stirring 96.8% of negative electrode active substance, 1.2% of conductive agent (conductive carbon black) and 2% of binder (styrene butadiene rubber) with water to prepare active substance layer slurry, wherein the viscosity of the slurry is 2000-5000 mPa & s, and the solid content is 40-50%.
(2) Mixing 80 wt% of garnet type solid electrolyte LLZO, 5 wt% of conductive carbon black and 15 wt% of polyvinylidene fluoride, adding N-methyl pyrrolidone, stirring and dispersing to prepare slurry, namely electrolyte supplement layer slurry.
(3) Simultaneously coating the slurries prepared in the above (1) and (2) on a current collector, wherein a negative electrode slurry is coated on a middle portion of the current collector to form a first coating region; applying an electrolyte supplement layer to a second coating region located at a periphery of the first coating region in connection with the first coating region; coating work on both sides of the current collector is completed in the same manner. In the negative electrode sheet after coating, drying and rolling, the width of the first coating region was 80mm, and the width of the second coating region was 3 mm.
(4) Mixing a positive electrode active substance (lithium cobaltate), a conductive agent (conductive carbon black) and a binder (PVDF) according to a mass ratio of 96:2.5:1.5, dispersing the mixture in N-methyl pyrrolidone (NMP), uniformly stirring to prepare slurry, uniformly coating the slurry with the viscosity of 2000-7000 mPa & s and the solid content of 70-80% on the two side surfaces of an aluminum foil of a positive electrode current collector, and baking for 4-8 h at 100-150 ℃ to prepare a positive electrode sheet.
(5) And rolling, die cutting and cutting the obtained positive and negative electrode sheets, winding and assembling into a roll core, packaging with an aluminum plastic film after a short circuit test is qualified, baking in an oven to remove water until the water content reaches a water content standard required by liquid injection, injecting electrolyte, aging for 24-48h, and completing primary charging by a hot pressing formation process to obtain the activated battery.
Examples 2 to 4
Examples 2 to 4 are different from example 1 in the width of the first coated region and the width of the second coated region, and the negative electrode active material is different, as shown in table 1.
Comparative example 1
The other operations are the same as example 1, except that the negative electrode sheet is:
preparing cathode slurry by taking graphite as a cathode active material: mixing and stirring the negative electrode active substance 96.8%, the conductive agent (conductive carbon black) 1.2% and the binder (styrene butadiene rubber) 2% with water to prepare the negative electrode slurry, wherein the viscosity of the slurry is 2000-5000 mPa & s, and the solid content is 40-50%.
And coating the prepared negative electrode slurry on two sides of a current collector. In the negative electrode sheet after coating, drying and rolling, the width of the coated area was 83 mm.
Comparative example 2
Comparative example 2 differs from comparative example 1 in that the negative electrode active material is different, specifically, as shown in table 1.
And (3) performance testing:
the cells prepared in the above examples and comparative examples were charged at 3C rate and discharged at 1C rate for a life test of 700 cycles, and the cell cycle retention rate was tested.
The cells prepared in the above examples and comparative examples were fully charged at 5C, discharged at 0.5C, and dissected after 20 times of charging and discharging to check the lithium deposition.
Table 1 composition and performance test results of batteries of examples and comparative examples
The above example results show that examples 1 to 4 prepared according to the present invention solve the problems of lithium deposition from the battery cell and the retention rate of the cycle capacity, compared to comparative examples 1 to 2 in the conventional manner.
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 (10)
1. The negative plate is characterized by comprising a current collector, a first coating area and a second coating area, wherein the first coating area is arranged on at least one side surface of the current collector, and the second coating area is connected with the first coating area and is positioned at the periphery of the first coating area;
an active material layer is arranged in the first coating area;
an electrolyte replenishment layer is disposed within the second coated region, the electrolyte replenishment layer including a solid electrolyte.
2. The negative electrode sheet of claim 1, wherein the solid electrolyte is a garnet-type solid electrolyte selected from doped or undoped lithium lanthanum zirconium oxide electrolytes, wherein the doping element is selected from at least one of the elements Al, Ga, Fe, Ge, Ca, Ba, Sr, Y, Nb, Ta, W, Sb.
3. Negative electrode sheet according to claim 2, wherein the garnet-type solid electrolyte is selected from Li7- mLa3Zr2-mTamO12(0≤m≤0.6)、Li7-yLa3Zr2-yNbyO12(y is 0. ltoreq. y.ltoreq.0.6) and Li6.4-pLa3Zr2-pTapAl0.2O12(0.2. ltoreq. p. ltoreq.0.5).
4. The negative electrode sheet according to claim 1, wherein the active material layer comprises a negative electrode active material selected from one or more of graphite, hard carbon, soft carbon, silicon-oxygen compound, and silicon-carbon compound.
5. The negative electrode sheet according to claim 4, wherein the particle diameter Dv50 of the negative electrode active material is 5 to 25 μm.
6. The negative electrode sheet according to claim 1, wherein the area ratio of the first coated region to the second coated region is 100 (0.5-5).
7. The negative electrode sheet according to claim 1, wherein the width of the first coating region is 10mm to 250 mm;
and/or the width of the second coating area is 0.5 mm-10 mm.
8. The negative electrode sheet according to claim 1, wherein the active material layer has a thickness of 10 to 50 μm;
and/or the thickness of the electrolyte supplement layer is 10-50 μm.
9. The negative electrode sheet according to claim 1, wherein the active material layer comprises a negative electrode active material, a first conductive agent and a first binder, and the mass percentages of the components are as follows: 90-99 wt% of negative electrode active material, 0.5-10 wt% of first conductive agent and 0.5-10 wt% of first binder.
10. A battery comprising the negative electrode sheet of any one of claims 1 to 9.
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