CN114497447A - Positive plate and lithium ion battery - Google Patents
Positive plate and lithium ion battery Download PDFInfo
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- CN114497447A CN114497447A CN202210086825.4A CN202210086825A CN114497447A CN 114497447 A CN114497447 A CN 114497447A CN 202210086825 A CN202210086825 A CN 202210086825A CN 114497447 A CN114497447 A CN 114497447A
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- 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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- 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
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- 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
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- 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
- H01M2004/028—Positive electrodes
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Abstract
The application provides a positive plate and a lithium ion battery. The application provides a positive plate in a first aspect, which comprises a positive current collector and a positive active layer arranged on at least one surface of the positive current collector, wherein the positive active layer comprises a first positive active material and a second positive active material, the first positive active material is positioned on one side close to the positive current collector, and the second positive active material is positioned on one side far away from the positive current collector; the first positive electrode active material has higher thermal stability than the second positive electrode active material. This application has avoided the problem of the thermal runaway of lithium ion battery because of the decomposition of being heated of anodal active material leads to through the thermal stability who improves the first anodal active material that is close to anodal mass flow body one side to lithium ion battery's security has been improved.
Description
Technical Field
The application relates to a positive plate and a lithium ion battery, and relates to the technical field of batteries.
Background
The lithium ion battery has the advantages of high platform voltage, high energy density, no memory effect, long service life and the like, so that the lithium ion battery is widely applied to the fields of smart phones, notebook computers, Bluetooth, wearable equipment and the like, and plays an important role in the life of people. However, when the lithium ion battery is abused, particularly when mechanical abuse such as needle punching occurs, the positive electrode and the negative electrode of the lithium ion battery are in contact short circuit, a large amount of heat is instantaneously generated, and thermal runaway of the lithium ion battery is caused.
The positive electrode and the negative electrode have four short circuit modes, namely a positive current collector is in contact with a negative active layer, a positive current collector is in contact with a negative current collector, a positive active layer is in contact with a negative current collector, and a positive active layer is in contact with a negative active layer, wherein the positive current collector and the negative active layer generate heat most intensely and are the short circuit mode most easily causing thermal runaway. Therefore, increasing attention has been paid to improving the safety of lithium ion batteries.
Disclosure of Invention
The application provides a positive plate for improve lithium ion battery's security.
The application also provides a lithium ion battery comprising the positive plate, and the lithium ion battery has better safety.
The first aspect of the present application provides a positive plate, including a positive current collector and a positive active layer disposed on at least one surface of the positive current collector, where the positive active layer includes a first positive active material and a second positive active material, the first positive active material is located on one side close to the positive current collector, and the second positive active material is located on one side far away from the positive current collector;
the first positive electrode active material has a higher thermal stability than the second positive electrode active material.
The present application provides a positive electrode sheet, fig. 1 is a schematic structural diagram of the positive electrode sheet provided in an embodiment of the present application, and as shown in fig. 1, the positive electrode sheet includes a positive electrode current collector 100 and a positive electrode active layer 200, where the positive electrode current collector 100 is in a sheet shape and has two opposite surfaces for bearing the positive electrode active layer, specifically, an upper surface and a lower surface of the positive electrode current collector 100, and the positive electrode active layer 200 is disposed on at least one surface of the positive electrode current collector 100, that is, the upper surface and/or the lower surface of the positive electrode current collector 100; the positive active layer 200 is used for providing capacity for the lithium ion battery, and includes a positive active material, and it is found through analysis and research that, when a positive current collector and a negative active layer are in contact short circuit to generate a large amount of heat, the positive active material close to the positive current collector 100 is easily decomposed by heat and generates heat and gas, thereby further aggravating the risk of thermal runaway of the lithium ion battery, based on the above analysis, the present application improves the thermal stability of the positive active material close to one side of the positive current collector 100, that is, the positive active layer 200 includes a first positive active material 301 and a second positive active material 302, the first positive active material 301 is located close to one side of the positive current collector 100, the second positive active material 302 is located far away from one side of the positive current collector 100, and meanwhile, the thermal stability of the first positive active material 301 is higher than that of the second positive active material 302, by improving the thermal stability of the first positive active material close to one side of the positive current collector, the problem of thermal runaway of the lithium ion battery caused by thermal decomposition of the anode active material is avoided, and the safety of the lithium ion battery is improved.
The conventional positive electrode active materials are doped with metal elements, so that the cycle stability of the positive electrode active material is improved, and researches show that the doping amount of the metal elements in the positive electrode active material is also related to the thermal stability, namely, the higher the doping amount of the metal elements is, the better the thermal stability is, therefore, the thermal stability can be adjusted by adjusting the doping amount of the metal elements in the positive electrode active material, specifically, the doping amount of the metal elements in the first positive electrode active material 301 is larger than that in the second positive electrode active material 302.
The doping of the metal element can be a means which is conventional in the art, and the metal element used for doping comprises one or more of aluminum, magnesium, titanium, manganese, chromium, lanthanum, niobium and zirconium.
With the increase of the doping amount of the metal element in the positive electrode active material, the gram capacity of the positive electrode active material is reduced, in order to take account of the energy density of the lithium ion battery, the gram capacity of the first positive electrode active material 301 is not less than 90% of the gram capacity of the second positive electrode active material 302, that is, the gram capacity of the first positive electrode active material 301 is not less than or equal to (the gram capacity of the second positive electrode active material 302 is 90%), and the gram capacity refers to the ratio of the electric capacity capable of being released by the positive electrode active material to the mass of the positive electrode active material.
The preparation process of the positive plate can be carried out according to the conventional technical means in the field, and only the first positive active material is required to be placed at one side close to the positive current collector, the second positive active material is required to be placed at one side far away from the positive current collector, in the actual preparation process, the first positive active material can be prepared to obtain a first positive active layer slurry, and coated on the surface of the positive electrode current collector to obtain a first positive electrode active layer, and then the second positive electrode active material is prepared to obtain second positive electrode active layer slurry, and is coated on the surface of the first positive active layer far away from the positive current collector to obtain a second positive active layer, namely, the positive electrode active layer includes a first positive electrode active layer including a first positive electrode active material and a second positive electrode active layer including a second positive electrode active material.
In order to further improve the safety of the lithium ion battery, the thermal decomposition starting temperature of the powder material in the first positive electrode active layer is higher than that of the powder material in the second positive electrode active layer by more than 20 ℃, and the thermal decomposition starting temperature refers to: in a full-electric state, the temperature of the powder material in the positive active layer at which thermal decomposition starts is specifically tested by the following method: the lithium ion battery comprising the positive plate is charged to the maximum charging voltage to reach a full-charge state (namely 100% SOC), then the lithium ion battery in the full-charge state is disassembled to obtain the positive plate, the positive plate is cleaned by ethanol and then dried, powder materials in the first positive active layer and the second positive active layer are respectively taken to be subjected to DSC test, the temperature when a heat release peak begins to appear is the thermal decomposition starting temperature, the powder materials specifically comprise positive active materials and other necessary auxiliary materials in the preparation process of the positive active layers, such as a conductive agent, a binding agent and the like, the thermal decomposition starting temperature of the powder materials can reflect the thermal stability of the first positive active material and the second positive active material laterally, and the safety of the lithium ion battery is further improved by further improving the thermal decomposition starting temperature of the first positive active material.
In general, the mass fraction of the first positive electrode active material/the second positive electrode active material in the first positive electrode active layer slurry/the second positive electrode active layer slurry is 95 to 98%, and when the thickness of the first positive electrode active layer is low, the content of the first positive electrode active material in the positive electrode active layer is low, and the effect on the safety of the lithium ion battery is limited, so that the thickness ratio of the first positive electrode active layer to the second positive electrode active layer is 0.1 or more in order to further improve the safety of the lithium ion battery.
However, when the thickness of the first positive electrode active layer is too high, the positive electrode active material having a low gram-capacity accounts for a large amount in the positive electrode active layer, and the energy density of the lithium ion battery is easily affected, and therefore, in order to further balance the energy density of the lithium ion battery, the thickness ratio of the first positive electrode active layer to the second positive electrode active layer is 0.5 or less.
The first positive electrode active material and the second positive electrode active material are conventional materials in the field, and specifically, the first positive electrode active material comprises one or more of metal element-doped lithium cobaltate, a nickel-cobalt-manganese ternary material and lithium iron phosphate; the second positive active material comprises one or two of metal element-doped lithium cobaltate and a nickel cobalt manganese ternary material, and compared with the first positive active material, the reason why the second positive active material does not comprise lithium iron phosphate is that the gram capacity of the lithium iron phosphate is low, the thermal stability is good, and the safety of the lithium ion battery is improved, but the energy density is reduced, so that the lithium iron phosphate is placed on one side close to the positive current collector, and the energy density and the safety of the lithium ion battery are both facilitated.
The positive active layer comprises a binder and a conductive agent besides the first positive active material and the second positive active material, generally, the mass fraction of the binder in the first positive active layer slurry/the second positive active layer slurry is 1-3%, the mass fraction of the conductive agent in the first positive active layer slurry/the second positive active layer slurry is 1-2%, the binder comprises one or more of polyvinylidene fluoride, acrylic acid modified polyvinylidene fluoride and polyimide, the conductive agent comprises one or more of carbon black, carbon nanotubes and graphene, the types and the contents of the conductive agent and the binder in the first positive active layer slurry and the second positive active layer slurry can be the same or different, and the same can be selected for simplifying the preparation of the positive plate.
In conclusion, the thermal stability of the first anode active material close to one side of the anode current collector is improved, so that the problem of thermal runaway of the lithium ion battery caused by thermal decomposition of the anode active material is avoided, and the safety of the lithium ion battery is improved.
In a second aspect, the present application provides a lithium ion battery, which includes any one of the positive electrode sheets described above.
The application provides a lithium ion battery, including the positive plate that this application first aspect provided, technical personnel in the field can be according to conventional technical means, with the positive plate collocation negative pole piece, the diaphragm equipment obtains the lithium ion battery to process preparation such as encapsulation, notes liquid, formation obtains lithium ion battery. The negative electrode sheet, the separator and the electrolyte may be made of materials conventional in the art, for example, the negative electrode sheet includes a negative electrode current collector and a negative electrode active layer disposed on at least one surface of the negative electrode current collector, the negative electrode active layer includes a negative electrode active material, a binder and a conductive agent, the negative electrode active material may include one or more of graphite, mesocarbon microbeads, soft carbon, hard carbon, silicon material, silica material, silicon carbon material and lithium titanate, the binder may include one or more of polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, sodium carboxymethyl cellulose, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate and styrene-butadiene rubber, and the conductive agent is one or more of carbon black, carbon nanotubes and graphene. The lithium ion battery provided by the application comprises the positive plate and has better safety.
The application has the following advantages:
1. this application has avoided the problem of the thermal runaway of lithium ion battery because of the decomposition of being heated of anodal active material leads to through the thermal stability who improves the first anodal active material that is close to anodal mass flow body one side to lithium ion battery's security has been improved.
2. The lithium ion battery provided by the application has better safety.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a positive electrode sheet according to an embodiment of the present application.
Description of reference numerals:
100-positive current collector;
200-positive active layer;
301 — a first positive electrode active material;
302-second positive electrode active material.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application, and it is obvious that the described embodiments are some but not all of the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The metal elements doped in the positive electrode active materials used in the following examples and comparative examples each include Al, Mg, Ti, Zr, and are commercially available.
Example 1
The positive plate that this embodiment provided includes anodal mass flow body aluminium foil and range upon range of setting in proper order at the first anodal active layer and the anodal active layer of second on aluminium foil surface, wherein:
the first positive electrode active layer includes 96 parts by mass of a first positive electrode active material, 1 part by mass of carbon black, 1 part by mass of carbon nanotubes, and 2 parts by mass of a binder PVDF;
the second positive electrode active layer includes 96 parts by mass of a second positive electrode active material, 1 part by mass of carbon black, 1 part by mass of carbon nanotubes, and 2 parts by mass of a binder PVDF;
the first positive electrode active material is lithium cobaltate doped with metal elements, the total doping amount of the metal elements is 15000ppm, and the 4.45V-3.0V gram capacity is 170 mAh/g;
the second positive electrode active material is lithium cobaltate doped with metal elements, the total doping amount of the metal elements is 5000ppm, and the 4.45V-3.0V gram capacity is 180 mAh/g;
the thickness of the first positive electrode active layer was 10 μm, and the thickness of the second positive electrode active layer was 40 μm.
The preparation process of the positive plate provided by the embodiment comprises the following steps:
1. dispersing the first positive electrode active material, carbon black, carbon nanotubes and PVDF in a solvent NMP according to the mass fractions, and uniformly mixing to obtain first positive electrode active layer slurry;
2. dispersing a second positive electrode active material, carbon black, carbon nanotubes and PVDF in a solvent NMP according to the mass fractions, and uniformly mixing to obtain a second positive electrode active layer slurry;
3. and coating the first positive active layer slurry on the surface of the aluminum foil of the positive current collector by using a gravure coating process to form a first positive active layer, drying the positive active layer by using an oven, coating the second positive active layer slurry on the surface of the first positive active layer in an extrusion coating mode to form a second positive active layer, and drying the second positive active layer slurry to obtain the positive plate.
Example 2
The positive electrode sheet provided by the present embodiment can be referred to embodiment 1, except that:
the first positive electrode active material comprises a metal element-doped lithium cobaltate and a metal element-doped nickel-cobalt-manganese ternary material (NCM523), and the mass ratio of the lithium cobaltate to the nickel-cobalt-manganese ternary material is 8: 2, the average doping amount of the metal elements is 14000ppm (the doping amount of the metal elements in the lithium cobaltate is 0.8+ the doping amount of the metal elements in the nickel-cobalt-manganese ternary material is 0.2) calculated according to the mass ratio, and the gram capacity of 4.45V-3.0V is 168 mAh/g.
Example 3
The positive electrode sheet provided by the present embodiment can be referred to embodiment 1, except that:
the first positive electrode active material comprises metal element-doped lithium cobaltate and metal element-doped lithium iron phosphate, and the mass ratio of the two is 8: 2; according to the same calculation method as that of example 2, the average doping amount of the metal element was 13000ppm, and the gram capacity of 4.45V to 3.0V was 164 mAh/g.
Example 4
The positive electrode sheet provided in this example can be referred to example 1 except that the thickness of the first positive electrode active layer was 4 μm.
Example 5
The positive electrode sheet provided in this example can be referred to example 1 except that the thickness of the first positive electrode active layer was 20 μm.
Example 6
The positive electrode sheet provided in this embodiment can be referred to in embodiment 1, and the difference is that the first positive electrode active material is lithium cobaltate doped with a metal element and lithium iron phosphate doped with a metal element, and the mass ratio of the two is 6: 4, the average doping amount of the metal element was 13000ppm and the 4.45V-3.0V g capacity was 150mAh/g according to the same calculation method as example 2.
Example 7
The positive electrode sheet provided in this example can be referred to example 1 except that the thickness of the first positive electrode active layer was 2 μm.
Example 8
The positive electrode sheet provided in this example can be referred to example 1 except that the thickness of the first positive electrode active layer was 40 μm.
Comparative example 1
The positive plate provided by the comparative example comprises a positive current collector and a positive active layer, wherein the positive active layer comprises a positive active material, the positive active material is lithium cobaltate doped with metal elements, the doping amount of the metal elements is 5000ppm, the gram capacity of 4.45V-3.0V is 180mAh/g, and the thickness of the positive active layer is 50 mu m.
Comparative example 2
The positive electrode sheet provided by this comparative example can be referred to example 1, except that the first positive electrode active material was lithium cobaltate doped with a metal element in an amount of 4000ppm, and the capacity of 4.45V to 3.0V was 181 mAh/g.
The positive plate provided by the embodiments 1-8 and the comparative examples 1-2 is matched with a negative plate to prepare two groups of lithium ion batteries, wherein the negative plate comprises a negative current collector copper foil and a negative active layer arranged on the surface of the negative current collector copper foil, the negative active layer comprises 96 parts by mass of artificial graphite, 1 part by mass of carbon black, 1.5 parts by mass of styrene butadiene rubber and 1.5 parts by mass of sodium carboxymethyl cellulose, the positive plate and the negative plate are rolled, cut and assembled to obtain a lithium ion battery core, and the lithium ion battery core is prepared by the working procedures of packaging, liquid injection, formation and the like.
Then, one group of lithium ion batteries are disassembled in a full-electric state to obtain a positive plate, the positive plate is cleaned by ethanol and dried in the air, a powder material in a positive active layer is taken to be subjected to a DSC test, and the thermal decomposition starting temperature of the powder material in the positive active layer is recorded, wherein the thermal decomposition starting temperatures of the powder materials in the first positive active layer provided in examples 1 to 8 and comparative example 2 are shown in table 1, and the thermal decomposition temperatures of the powder materials in the second positive active layer provided in examples 1 to 8 and comparative example 2 and the positive active layer provided in comparative example 1 and comparative example 1 are 232 ℃.
And (3) carrying out energy density test and needling test on another group of lithium ion batteries, wherein the specific test method is as follows, and the test results are shown in table 1:
and (3) energy density testing: the energy density ED of the cell is U C0/(L W H), where U is the average voltage of the cell during discharge from full charge to the lower voltage limit, C0 is the actual capacity, L is the cell length, W is the cell width, and H is the cell height.
Test method of actual capacity C0: fully charged at a rate of 0.5C, and then discharged at a rate of 0.5C to a cut-off voltage (the voltage range used in this application is 4.45-3.0V), and the discharge capacity thereof is taken as the actual capacity C0 of the lithium ion battery.
And (3) needle punching test: after the lithium ion battery is fully charged, the lithium ion battery is placed on a needling test device, a 3mm steel needle is used for penetrating the center of the plane of the battery at the speed of 100mm/s, the battery is kept for 5min after penetrating the battery, and then the battery is withdrawn. The battery did not ignite and did not explode and the test was considered passed.
Table 1 positive electrode sheet parameters and performance test results of lithium ion batteries provided in examples 1-8 and comparative examples 1-2
According to the examples 1 to 8, when the thermal stability of the first positive electrode active material on the side close to the positive electrode current collector is higher than that of the second positive electrode active material on the side far away from the positive electrode current collector, the puncture passing rate of the lithium ion battery is obviously improved, and the safety is improved; according to example 6, when the gram capacity of the first positive electrode active material is lower than 90% of the gram capacity of the second positive electrode active material, the energy density of the lithium ion battery is low; according to example 7, when the thickness ratio of the first positive electrode active layer to the second positive electrode active layer is less than 0.1, the content of the first active material on the side close to the positive electrode current collector is relatively low, resulting in poor safety of the lithium ion battery; according to example 8, it is found that when the thickness ratio of the first positive electrode active layer to the second positive electrode active layer is higher than 0.5, the energy density loss of the lithium ion battery is large because the first positive electrode active layer is too thick; therefore, the safety of the lithium ion battery is improved by improving the thermal stability of the first cathode active material, and the gram capacity of the first cathode active material and the thickness range of the first cathode active layer are controlled, so that the safety of the lithium ion battery is improved, and the energy density of the lithium ion battery is also considered.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The positive plate is characterized by comprising a positive current collector and a positive active layer arranged on at least one surface of the positive current collector, wherein the positive active layer comprises a first positive active material and a second positive active material, the first positive active material is positioned on one side close to the positive current collector, and the second positive active material is positioned on one side far away from the positive current collector;
the first positive electrode active material has a higher thermal stability than the second positive electrode active material.
2. The positive electrode sheet according to claim 1, wherein a doping amount of a metal element in the first positive electrode active material is larger than a doping amount of a metal element in the second positive electrode active material.
3. The positive electrode sheet according to claim 2, wherein the metal element includes one or more of aluminum, magnesium, titanium, manganese, chromium, lanthanum, niobium, and zirconium.
4. The positive electrode sheet according to any one of claims 1 to 3, wherein the gram capacity of the first positive electrode active material is not less than 90% of the gram capacity of the second positive electrode active material.
5. The positive electrode sheet according to claim 1, wherein the positive electrode active layer comprises a first positive electrode active layer comprising a first positive electrode active material and a second positive electrode active layer comprising a second positive electrode active material;
the thermal decomposition starting temperature of the powder material in the first positive electrode active layer is higher than that of the powder material in the second positive electrode active layer by more than 20 ℃.
6. The positive electrode sheet according to claim 5, wherein the thickness ratio of the first positive electrode active layer to the second positive electrode active layer is 0.1 or more.
7. The positive electrode sheet according to claim 6, wherein the thickness ratio of the first positive electrode active layer to the second positive electrode active layer is 0.5 or less.
8. The positive electrode sheet according to any one of claims 1 to 7, wherein the first positive electrode active material comprises one or more of a metal element-doped lithium cobaltate, a nickel cobalt manganese ternary material, and lithium iron phosphate; the second positive electrode active material comprises one or two of metal element doped lithium cobaltate and nickel cobalt manganese ternary material.
9. The positive electrode sheet according to any one of claims 1 to 7, wherein the positive electrode active layer further comprises a binder and a conductive agent, the binder comprises one or more of polyvinylidene fluoride, acrylic-modified polyvinylidene fluoride, and polyimide, and the conductive agent comprises one or more of carbon black, carbon nanotubes, and graphene.
10. A lithium ion battery comprising the positive electrode sheet according to any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115832197A (en) * | 2022-11-10 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Composite electrode and preparation method thereof, battery and electric equipment |
| CN116470005A (en) * | 2023-06-16 | 2023-07-21 | 深圳海辰储能控制技术有限公司 | Positive plate, lithium ion battery and energy storage equipment |
| CN117154014A (en) * | 2023-01-17 | 2023-12-01 | 荣耀终端有限公司 | Positive plate and application thereof |
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| CN116470005B (en) * | 2023-06-16 | 2023-09-08 | 深圳海辰储能控制技术有限公司 | Positive plate, lithium ion battery and energy storage equipment |
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