Negative plate, lithium ion battery and vehicle

Abstract

The negative plate comprises a current collector and a tab which are connected with each other, the current collector comprises a main body area and an edge area which are connected with each other, the edge area is located between the main body area and the tab, and a first active material layer is correspondingly arranged on the surface of the main body area. A second active material layer is correspondingly arranged on the surface of the edge area, the surface density of the first active material layer is larger than that of the second active material layer, the gram volume of the first active material layer is smaller than that of the second active material layer, and the ratio R of the surface volume of the first active material layer to the surface volume of the second active material layer is larger than 0.5 and smaller than 1. The negative plate can effectively avoid the lithium precipitation phenomenon in the thinned area, and the cycle performance and the safety performance of the lithium ion battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a negative electrode sheet, a lithium-ion battery and a vehicle. Background Art

[0002] In the coating process of lithium-ion batteries, in order to avoid problems such as thick edges and bulging edges on the negative electrode sheet, the coating of the edge area of the negative electrode sheet is thinned, thus generating a thinned area. However, during the coating process, it is difficult to control the N / P ratio in the thinned area of the negative electrode sheet, and it is easy to have a situation where the N / P ratio in the thinned area is less than 1, resulting in the phenomenon of lithium deposition in the thinned area of the negative electrode sheet during the cyclic charging process of the lithium-ion battery, reducing the cyclic performance and safety performance of the lithium-ion battery. Summary of the Utility Model

[0003] Based on this, in view of the above problems, it is necessary to provide a negative electrode sheet, a lithium-ion battery and a vehicle, which can effectively avoid the phenomenon of lithium deposition in the thinned area and improve the cyclic performance and safety performance of the lithium-ion battery.

[0004] A negative electrode sheet includes a current collector and a tab connected to each other. The current collector includes a main body area and an edge area connected to each other. The edge area is located between the main body area and the tab. A first active material layer is correspondingly provided on the surface of the main body area, and a second active material layer is correspondingly provided on the surface of the edge area. The areal density of the first active material layer is greater than that of the second active material layer, the specific capacity of the first active material layer is less than that of the second active material layer, and the ratio of the areal capacity of the first active material layer to the areal capacity of the second active material layer is R, where 0.5 < R < 1.

[0005] In one embodiment, the areal density of the first active material layer is 60 g / m 2 -160 g / m 2 ;

[0006] And / or, the areal density of the second active material layer is 40 g / m 2 -140 g / m 2 .

[0007] In one embodiment, the specific capacity of the first active material layer is 340 mAh / g - 800 mAh / g;

[0008] And / or, the specific capacity of the second active material layer is 360 mAh / g - 2160 mAh / g.

[0009] In one embodiment, the areal capacity of the first active material layer is 15 Ah / m 2 -80 Ah / m 2 ;

[0010] and / or, the areal capacity of the second active material layer is 20 Ah / m 2 -90 Ah / m 2 .

[0011] In one embodiment, along the length direction of the current collector, the length of the main body region is 50 mm - 800 mm, and the length of the edge region is 5 mm - 30 mm;

[0012] and / or, along the thickness direction of the current collector, the thickness of the first active material layer is 40 μm - 100 μm, and the average thickness of the second active material layer is 20 μm - 97 μm.

[0013] In one embodiment, the tap density of the first active material layer is 1.5 g / cm 3 -1.7 g / cm 3 ;

[0014] and / or, the tap density of the second active material layer is 1.2 g / cm 3 -1.6 g / cm 3 .

[0015] In one embodiment, along the length direction of the current collector, the thickness gradient of the second active material layer in the edge region decreases.

[0016] In one embodiment, the first active material layer is selected from any one of a hard carbon layer, a soft carbon layer, a silicon-carbon layer, a phosphorus-carbon layer, or a graphite layer;

[0017] and / or, the second active material layer is selected from a graphite layer or a silicon-carbon layer;

[0018] and / or, the current collector is selected from any one of a copper foil, a carbon-coated copper foil, an aluminum foil, or a carbon-coated aluminum foil.

[0019] A lithium-ion battery, the lithium-ion battery includes the negative electrode sheet as described above.

[0020] A vehicle, the vehicle includes the lithium-ion battery as described above.

[0021] For the negative electrode sheet of the present utility model, by defining that the surface density of the first active material layer is greater than that of the second active material layer, the existence of the thinned area of the negative electrode sheet can be better ensured, effectively preventing the occurrence of thick edges, edge overpressure and tape breakage during the rolling process of the battery, improving the production efficiency of the lithium-ion battery, and at the same time being beneficial to improving the lithium intercalation ability of the edge area and reducing the lithium deposition phenomenon in the edge area of the negative electrode sheet; at the same time, by defining that the specific capacity of the first active material is less than that of the second active material and defining the ratio of the areal capacity of the first active material layer to the areal capacity of the second active material layer, the N / P ratio of the edge area can be better controlled, and the N / P ratio of the edge area is higher than that of the main body area, providing sufficient vacancies for lithium ions to be embedded, thus effectively avoiding the lithium deposition phenomenon in the thinned area of the negative electrode sheet, and further improving the cycle performance and safety performance of the lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 The top view schematic diagram of the current collector in the negative electrode sheet of one of the embodiments provided by the present utility model;

[0024] Figure 2 The top view schematic diagram of the negative electrode sheet of one of the embodiments provided by the present utility model;

[0025] Figure 3 The longitudinal sectional schematic diagram of the negative electrode sheet of one of the embodiments provided by the present utility model.

[0026] Reference numerals: 1, current collector; 2, tab; 3, main body area; 4, edge area; 5, first active material layer; 6, second active material layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and understandable, the following will give a detailed description of the specific embodiments of the present utility model with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0028] It should be noted that in the present utility model, unless otherwise defined, all the technical and scientific terms used in the description of the present utility model have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used in the description of the present utility model includes any and all combinations of one or more of the related listed items.

[0029] The following further describes the negative electrode sheet, lithium-ion battery, and vehicle provided by the present utility model in conjunction with the accompanying drawings and specific embodiments.

[0030] Referring to Figures 1-3 As shown, the negative electrode sheet includes a current collector 1 and a tab 2 connected to each other. The current collector 1 includes a main body region 3 and an edge region 4 connected to each other, and the edge region 4 is located between the main body region 3 and the tab 2.

[0031] It can be understood that the current collector 1 is divided into a connected main body region 3 and an edge region 4, and the edge region 4 is close to the tab 2 and is electrically connected to the tab 2.

[0032] Referring to Figures 2-3 As shown, a first active material layer 5 is correspondingly provided on the surface of the main body region 3, and a second active material layer 6 is correspondingly provided on the surface of the edge region 4.

[0033] It can be understood that along the thickness direction of the current collector 1, the current collector 1 has two relatively arranged surfaces, and the first active material layer 5 and the second active material layer 6 are both coated on any one of the two surfaces.

[0034] Of course, in the present utility model, on the premise that both the first active material layer 5 and the second active material layer 6 are coated on the same surface of the current collector 1, both of the above two surfaces can also be coated with the first active material layer 5 and the second active material layer 6 at the same time.

[0035] Among them, the areal density of the first active material layer 5 is greater than that of the second active material layer 6, which can better ensure the existence of the thinning area of the negative electrode sheet, effectively prevent the occurrence of thick edges, edge overpressure, and tape breakage during the rolling process of the battery, and improve the production efficiency of the negative electrode sheet and the lithium-ion battery; at the same time, it can improve the lithium intercalation ability of the edge region 4 to a certain extent and reduce the lithium deposition phenomenon in the edge region 4 of the negative electrode sheet, that is, reduce the lithium deposition phenomenon in the thinning area of the negative electrode sheet.

[0036] It can be understood that the edge region 4 with the second active material layer 6 formed on its surface is equivalent to the thinning area of the negative electrode sheet in the prior art.

[0037] Considering that the areal density of the second active material layer 6 is lower than that of the first active material layer 5, resulting in the areal density of the edge region 4 being lower than that of the main body region 3, it is easy to cause the N / P ratio at the position of the edge region 4 to be lower than the design value, that is, the N / P ratio in the thinned area of the negative electrode sheet is less than 1, and then the phenomenon of lithium deposition at the edge of the negative electrode sheet occurs.

[0038] Therefore, in the present utility model, the specific capacity of the first active material layer 5 is less than that of the second active material layer 6, and the ratio of the areal capacity of the first active material layer 5 to the areal capacity of the second active material layer 6 is R, where 0.5 < R < 1, which can better control the N / P ratio of the edge region 4 and make the N / P ratio of the edge region 4 higher than that of the main body region 3, providing enough vacancies for lithium ion insertion, avoiding the situation where the N / P ratio in the thinned area of the negative electrode sheet is less than 1, thereby effectively avoiding the phenomenon of lithium deposition in the thinned area of the negative electrode sheet, and further improving the cycle performance and safety performance of the lithium ion battery.

[0039] Therefore, the negative electrode sheet of the present utility model can effectively avoid the phenomenon of lithium deposition in the thinned area, and improve the cycle performance and safety performance of the lithium ion battery.

[0040] It should be noted that in the present utility model, the N / P ratio is obtained by the following calculation formula: N / P ratio = (specific capacity of negative electrode active material × areal density of negative electrode × content ratio of negative electrode active material) / (specific capacity of positive electrode active material × areal density of positive electrode × content ratio of positive electrode active material); the calculation formula for areal density is: areal density = mass of active material layer / covered area of active material layer on current collector, for example, the areal density of the first active material layer 5 = mass of the first active material layer / area of the main body region 3 in the current collector; the calculation formula for specific capacity is: specific capacity = capacitance released by active material / mass of active material; areal capacity refers to the capacity stored per unit area of the current collector, and its calculation formula is: areal capacity = specific capacity × areal density × proportion of active material.

[0041] Optionally, the areal density of the first active material layer 5 is 60 g / m 2 -160 g / m 2 ; it can be understood that the areal density of the first active material layer 5 can be any value between 60 g / m 2 -160 g / m 2 Specifically, the areal density of the first active material layer 5 includes but is not limited to 60 g / m 2 、70 g / m 2 、80 g / m 2 、90 g / m 2 、100 g / m 2 、110 g / m 2 、120 g / m2 、 130 g / m 2 、 140 g / m 2 、 150 g / m 2 、 155 g / m 2 、 160 g / m 2 。

[0042] Furthermore, the areal density of the second active material layer 6 is 40 g / m 2 -140 g / m 2 . It can be understood that the areal density of the second active material layer 6 can be any value between 40 g / m 2 -140 g / m 2 , specifically, the areal density of the second active material layer 6 includes but is not limited to 40 g / m 2 、 50 g / m 2 、 60 g / m 2 、 70 g / m 2 、 80 g / m 2 、 90 g / m 2 、 100 g / m 2 、 110 g / m 2 、 120 g / m 2 、 130 g / m 2 、 140 g / m 2 。

[0043] In the present utility model, on the basis of ensuring that the areal density of the first active material layer 5 is greater than that of the second active material layer 6, it is further ensured reliably that there is a sufficiently large areal capacity and lithium intercalation ability at the edge of the negative electrode sheet, thereby improving the energy density of the battery.

[0044] Optionally, the specific capacity of the first active material layer 5 is 340 mAh / g - 800 mAh / g; it can be understood that the specific capacity of the first active material layer 5 can be any value between 340 mAh / g - 800 mAh / g, specifically, the specific capacity of the first active material layer 5 includes but is not limited to 340 mAh / g, 350 mAh / g, 380 mAh / g, 400 mAh / g, 450 mAh / g, 480 mAh / g, 500 mAh / g, 550 mAh / g, 600 mAh / g, 650 mAh / g, 700 mAh / g, 800 mAh / g.

[0045] Optionally, the specific capacity of the second active material layer 6 is 360 mAh / g - 2160 mAh / g. It can be understood that the specific capacity of the second active material layer 6 can be any value between 360 mAh / g and 2160 mAh / g. Specifically, the specific capacity of the second active material layer 6 includes but is not limited to 360 mAh / g, 400 mAh / g, 500 mAh / g, 600 mAh / g, 700 mAh / g, 900 mAh / g, 1000 mAh / g, 1500 mAh / g, 1800 mAh / g, 2000 mAh / g, 2100 mAh / g, 2160 mAh / g.

[0046] In the present utility model, by controlling the specific capacity of the first active material layer 5 and the specific capacity of the first active material layer 5, the N / P ratio of the thinned area of the negative electrode sheet and the main body area 3 can be better controlled, thereby reliably ensuring that there is a sufficiently large areal capacity and lithium intercalation ability at the edge of the negative electrode sheet, which is beneficial to improving the cycle performance of the battery.

[0047] It can be understood that the magnitudes of the specific capacities of the first active material layer 5 and the second active material layer 6 mainly depend on the specific capacities of the active materials in the first active material layer 5 and the second active material layer 6.

[0048] Specifically, in the present utility model, the first active material layer 5 is selected from any one of a hard carbon layer, a soft carbon layer, a silicon-carbon layer, a phosphorus-carbon layer, or a graphite layer; the second active material layer 6 is selected from a graphite layer or a silicon-carbon layer.

[0049] Optionally, the areal capacity of the first active material layer 5 is 15 Ah / m 2 -80 Ah / m 2 , and it can be understood that the areal capacity of the first active material layer 5 includes but is not limited to 15 Ah / m 2 、20 Ah / m 2 、30 Ah / m 2 、40 Ah / m 2 、50 Ah / m 2 、60 Ah / m 2 、70 Ah / m 2 、80 Ah / m 2 .

[0050] Further, the areal capacity of the second active material layer 6 is 20 Ah / m 2 -90 Ah / m 2 , and it can be understood that the areal capacity of the second active material layer 6 includes but is not limited to 20 Ah / m 2 、30 Ah / m 2 、40 Ah / m 2 、50 Ah / m2 , 60 Ah / m 2 , 70 Ah / m 2 , 80 Ah / m 2 , 90 Ah / m 2 .

[0051] In the present utility model, by precisely regulating the areal capacity of the first active material layer 5 and the areal capacity of the second active material layer 6, it is possible to better ensure that the edge region 4 has a greater lithium intercalation capacity relative to the main body region 3, ensure that the edge region 4 has sufficient lithium intercalation capacity, and further better avoid the phenomenon of lithium deposition at the edge of the negative electrode sheet.

[0052] It should be noted that the areal density of the first active material layer 5 and the second active material layer 6 in the present utility model are both single-sided areal densities, and the areal capacity of the first active material layer 5 and the second active material layer 6 are also both single-sided areal capacities.

[0053] Refer to Figure 1 As shown, the direction indicated by the arrow is the length direction of the current collector 1. In the present utility model, along the length direction of the current collector 1, the length of the main body region 3 is 50 mm - 800 mm. It can be understood that the length of the main body region 3 includes but is not limited to 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm.

[0054] Furthermore, the length of the edge region 4 is 5 mm - 30 mm. It can be understood that the length of the main body region 3 includes but is not limited to 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm.

[0055] It should be noted that the length of the edge region 4 in the present utility model refers to the length of a single edge region 4. For example, when edge regions 4 are provided at both ends of the main body region 3, the length of a single edge region 4 is 5 mm - 30 mm, and the total length of the two end thinned regions is 10 mm - 60 mm.

[0056] In one embodiment, the length of the tab 2 is 15 mm - 35 mm.

[0057] It can be understood that the length of the current collector 1 is greater than the sum of the lengths of the main body region 3 and the edge region 4. In one embodiment, when the tab 2 is provided on the surface of the current collector 1, the length of the current collector 1 is the sum of the length of the main body region 3, the length of the edge region 4, and the length of the tab 2.

[0058] In the present utility model, by controlling the lengths of the main body region 3 and the edge region 4, it is beneficial for the negative electrode sheet to better improve the comprehensive performance of the lithium-ion battery while effectively avoiding the phenomenon of lithium deposition in the thinning area.

[0059] Optionally, along the thickness direction of the current collector 1, the thickness of the first active material layer 5 is 40 μm - 100 μm. It can be understood that the thickness of the first active material layer 5 includes but is not limited to 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm.

[0060] Furthermore, the average thickness of the second active material layer 6 is 20 μm - 97 μm. It can be understood that the average thickness of the second active material layer 6 includes but is not limited to 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 95 μm, 97 μm.

[0061] In the present utility model, by controlling the thickness of the first active material layer 5 and the average thickness of the second active material layer 6, while improving the production efficiency of the negative electrode sheet and the lithium-ion battery, the influence of process fluctuations during the coating process can be effectively reduced, better ensuring that the N / P ratio of the edge region 4 is within the designed range, avoiding lithium deposition and safety problems caused by too low N / P ratio, and thus improving the cycle performance and safety performance of the lithium-ion battery.

[0062] It should be noted that the thickness of the first active material layer 5 and the average thickness of the second active material layer 6 in the present utility model respectively refer to the single-sided thickness of the first active material layer 5 and the single-sided average thickness of the second active material layer 6.

[0063] Optionally, the compaction density of the first active material layer 5 is 1.5 g / cm 3 -1.7 g / cm 3 ; it can be understood that the compaction density of the first active material layer 5 includes but is not limited to 1.5 g / cm 3 、1.6 g / cm 3 、1.7 g / cm 3 。

[0064] Furthermore, the compaction density of the second active material layer 6 is 1.2 g / cm 3 -1.6 g / cm 3 。It can be understood that the compaction density of the second active material layer 6 includes but is not limited to 1.2 g / cm 3 、1.3 g / cm 3 、1.4 g / cm 3 、1.5 g / cm 3 、1.6 g / cm 3 。

[0065] In the present utility model, by controlling the compaction density of the first active material layer 5 and the second active material layer 6, it is beneficial to improve the energy density and cycling performance of the lithium-ion battery.

[0066] It should be noted that in the present utility model, the calculation formula for the compaction density is: compaction density = areal density / thickness of the active material layer.

[0067] Reference Figure 3 As shown, along the length direction of the current collector 1, the thickness gradient of the second active material layer 6 in the edge region 4 decreases. Such a setting can help ensure a smooth transition and consistency in the thickness of the negative electrode sheet in the battery, while avoiding the phenomenon of capacity loss due to direct thickness drop at the junction of the main region 3 and the edge region 4 during transportation and subsequent production, thereby improving production efficiency.

[0068] Optionally, the current collector 1 is selected from any one of copper foil, carbon-coated copper foil, aluminum foil, or carbon-coated aluminum foil.

[0069] In one embodiment, the mass fraction of the first active material in the first active material layer 5 is 90% - 98%, and the mass fraction of the second active material in the second active material layer 6 is 90% - 98%.

[0070] In one embodiment, the first active material layer 5 further includes a first conductive agent, a first binder, and a first thickening agent. Among them, the mass fraction of the first conductive agent in the first active material layer 5 is 0.5% - 3%, the mass fraction of the first binder in the first active material layer 5 is 1% - 2%, and the mass fraction of the first thickening agent in the first active material layer 5 is 1% - 3%.

[0071] In one embodiment, the second active material layer 6 further includes a second conductive agent, a second binder, and a second thickening agent. Among them, the mass fraction of the second conductive agent in the second active material layer 6 is 0.5% - 3%, the mass fraction of the second binder in the second active material layer 6 is 1% - 2%, and the mass fraction of the second thickening agent in the second active material layer 6 is 1% - 3%.

[0072] Furthermore, the first conductive agent and the second conductive agent are each independently selected from at least one of conductive carbon black, acetylene black, or carbon nanotubes; the first binder and the second binder are both selected from polyvinylidene fluoride, and the first thickening agent and the second thickening agent are both selected from sodium carboxymethyl cellulose.

[0073] The present utility model also provides a method for preparing a negative electrode sheet, including the following steps:

[0074] Mix the first active material, the first conductive agent, the first thickening agent, the first binder and the solvent to obtain a first slurry;

[0075] Mix the second active material, the second conductive agent, the second thickening agent, the second binder and the solvent to obtain a second slurry;

[0076] Coat the first slurry on the main body area 3 of the current collector 1 which is far from the tab 2 and on one side of the tab 2, and coat the second slurry on the edge area 4 of the current collector 1 which is close to the tab 2 and on one side of the tab 2 to obtain a prefabricated electrode sheet;

[0077] Place the prefabricated electrode sheet in an oven for drying to form a first active material layer 5 on the main body area 3 and a second active material layer 6 on the edge area 4, thereby obtaining a negative electrode sheet, wherein the drying temperature is 100°C - 130°C.

[0078] Meanwhile, the present invention also provides a lithium-ion battery, and the lithium-ion battery includes the negative electrode sheet as described above. Since the lithium-ion battery adopts the negative electrode sheet of the present invention, it has excellent cycle performance and safety performance.

[0079] In addition, a vehicle includes the lithium-ion battery as described above.

[0080] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0081] The above-described embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A negative electrode sheet, comprising a current collector and a tab connected to each other, wherein the current collector comprises a main body region and an edge region connected to each other, wherein the edge region is located between the main body region and the tab, wherein a first active material layer is disposed on a surface of the main body region, and a second active material layer is disposed on a surface of the edge region, wherein: The surface density of the first active material layer is greater than that of the second active material layer, the gram capacity of the first active material layer is less than that of the second active material layer, and the ratio of the surface capacity of the first active material layer to the surface capacity of the second active material layer is R, 0.5<R<1.

2. The negative electrode sheet according to claim 1, characterized in that: The surface density of the first active material layer is 60 g / m 2 -160g / m 2 ; And / or, the surface density of the second active material layer is 40 g / m 2 -140g / m 2 .

3. The negative electrode sheet according to claim 1, characterized in that: The gram capacity of the first active material layer is 340 mAh / g-800 mAh / g; And / or, the gram capacity of the second active material layer is 360 mAh / g-2160 mAh / g.

4. The negative electrode sheet according to claim 1, characterized in that: The surface capacity of the first active material layer is 15 Ah / m 2 -80Ah / m 2 ; And / or, the surface capacity of the second active material layer is 20 Ah / m 2 -90Ah / m 2 .

5. The negative electrode sheet according to claim 1, characterized in that: Along the length direction of the current collector, the length of the main region is 50 mm to 800 mm, and the length of the edge region is 5 mm to 30 mm; And / or, along the thickness direction of the current collector, the thickness of the first active material layer is 40 μm-100 μm, and the average thickness of the second active material layer is 20 μm-97 μm.

6. The negative electrode sheet according to any one of claims 1 to 5, characterized in that: The compaction density of the first active material layer is 1.5 g / cm 3 -1.7g / cm 3 ; And / or, the compaction density of the second active material layer is 1.2 g / cm 3 -1.6g / cm 3 .

7. The negative electrode sheet according to any one of claims 1 to 5, characterized in that: Along the length direction of the current collector, the thickness of the second active material layer in the edge region decreases gradually.

8. The negative electrode sheet according to any one of claims 1 to 5, characterized in that: The first active material layer is selected from any one of a hard carbon layer, a soft carbon layer, a silicon carbon layer, a phosphorus carbon layer or a graphite layer; And / or, the second active material layer is selected from a graphite layer or a silicon carbon layer; And / or, the current collector is selected from any one of copper foil, carbon-coated copper foil, aluminum foil or carbon-coated aluminum foil.

9. A lithium ion battery, characterized in that: The lithium-ion battery comprises the negative electrode sheet as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle includes the lithium-ion battery of claim 9.

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