CN115425171A - Positive plate, preparation method of positive plate and battery - Google Patents

Positive plate, preparation method of positive plate and battery Download PDF

Info

Publication number
CN115425171A
CN115425171A CN202211064759.7A CN202211064759A CN115425171A CN 115425171 A CN115425171 A CN 115425171A CN 202211064759 A CN202211064759 A CN 202211064759A CN 115425171 A CN115425171 A CN 115425171A
Authority
CN
China
Prior art keywords
battery
positive plate
current collector
positive
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211064759.7A
Other languages
Chinese (zh)
Inventor
黄圣华
晁广召
丁意军
李辉
胡大林
廖兴群
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huizhou Highpower Technology Co Ltd
Original Assignee
Huizhou Highpower Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huizhou Highpower Technology Co Ltd filed Critical Huizhou Highpower Technology Co Ltd
Priority to CN202211064759.7A priority Critical patent/CN115425171A/en
Publication of CN115425171A publication Critical patent/CN115425171A/en
Pending legal-status Critical Current

Links

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
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a positive plate, a preparation method of the positive plate and a battery thereof, wherein the positive plate comprises a current collector, a bottom coating and a positive material; the undercoat layer is disposed on the surface of the current collector, and the positive electrode material is disposed on the undercoat layer; wherein, in the bottom coating, the bottom coating comprises 70 to 98 percent of lithium iron phosphate, 0.5 to 15 percent of conductive agent, 0.5 to 15 percent of binder and 0.5 to 20 percent of heat-sensitive material by mass percent. The positive plate is applied to a battery, and the energy density and the safety are considered at the same time by arranging the bottom coating on the surface of the current collector. When the battery is short-circuited and overheated, referring to fig. 1, the thermal sensitive material of the bottom coating rapidly expands to separate the conductive agent and the lithium iron phosphate particles in the bottom coating, so that the internal resistance of the bottom coating is sharply increased, and even approaches to an open circuit state to cut off a current loop and cut off an electronic path to a certain extent, the battery self-protection can be realized without independently arranging an insulating layer, the heat generation is reduced, the accident is avoided to a certain extent, and the use safety of the battery is improved.

Description

Positive plate, preparation method of positive plate and battery
Technical Field
The invention relates to the technical field of new energy alkali metal element batteries, in particular to a positive plate, a preparation method of the positive plate and a battery thereof.
Background
The new energy alkali metal element battery has the advantages of cleanness, high specific energy, high charging and discharging speed, no memory effect and the like, is widely used in various fields of life, but has certain use safety risks due to high activity of alkali metal, for example, the battery is subjected to acupuncture and extrusion deformation to cause accidents such as short circuit, fire, explosion and the like, and the problem of urgent need to be solved for improving the use safety of the lithium ion battery.
At present, more measures for solving the problem of new energy batteries of thermal runaway and ignition are taken, for example, an overcharge-preventing additive, a flame-retardant additive and a nonflammable additive are added into an electrolyte, but the safety of the batteries is not effectively solved due to the extremely high flammability of an organic solvent and the use of the additive. Therefore, a battery having high safety is required.
Disclosure of Invention
The invention aims to provide a positive plate, a preparation method of the positive plate and a battery of the positive plate, and the use safety of the battery is improved.
The invention discloses a positive plate, which comprises a current collector, a bottom coating and a positive material; the undercoat layer is disposed on the surface of the current collector, and the positive electrode material is disposed on the undercoat layer; wherein, in the base coat, the base coat comprises the following components in percentage by mass:
Figure BDA0003827856120000021
optionally, in the base coat, the base coat comprises, in mass percent, the components:
Figure BDA0003827856120000022
optionally, the heat-sensitive material comprises CaCO 3 、MgCO 3 、Ca(HCO 3 ) 2 、Mg(HCO 3 ) 2 One or more of thermal expansion composite resin, thermal expansion composite plastic, thermal expansion composite rubber and organic glass.
Optionally, the primer layer has a thickness of 0.5-30um.
Optionally, the primer layer has a thickness of 1-10um.
Optionally, the conductive agent is carbon nanotubes, the binder is polyvinylidene fluoride, and the thermosensitive material is one of thermal expansion composite resin, thermal expansion composite plastic and thermal expansion composite rubber; in the undercoat layer, the proportion of lithium iron phosphate is 75%, the proportion of polyvinylidene fluoride is 5%, the proportion of carbon nanotubes is 10%, and the proportion of thermally expandable composite resin, thermally expandable composite plastic or thermally expandable composite rubber is 10%, by mass.
The invention also discloses a battery, which comprises the positive plate.
The invention also discloses a preparation method of the positive plate, which is applied to the positive plate and comprises the following steps:
adding the conductive agent into the adhesive solution of the adhesive according to the proportion, and stirring for 15-50min;
adding the heat-sensitive material in proportion, and stirring for 5-25min;
adding lithium iron phosphate in proportion, stirring for 20-50min, and controlling the viscosity at 1000-2500Mpa.s to obtain a base coating slurry;
and coating the priming coating slurry on a current collector to obtain the positive plate.
Alternatively, the primer slurry is applied at a thickness of 0.5um to 30um and at a speed of 5m/s to 40m/s.
Optionally, the step of coating the undercoat slurry on the current collector specifically comprises: and coating the priming paint on the current collector through a gravure priming machine.
The positive plate is applied to a battery, and the energy density and the safety are both considered by arranging the bottom coating on the surface of the current collector. When the battery is short-circuited and overheated, referring to fig. 1, the thermal sensitive material of the bottom coating rapidly expands to separate the conductive agent and the lithium iron phosphate particles in the bottom coating, so that the internal resistance of the bottom coating is sharply increased, and even approaches to an open circuit state to cut off a current loop and cut off an electronic path to a certain extent, the battery self-protection can be realized without independently arranging an insulating layer, the heat generation is reduced, the accident is avoided to a certain extent, and the use safety of the battery is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic view showing a change in state of a primer layer being overheated according to an embodiment of the present invention.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are not intended to be limiting, since the present invention may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
The invention is described in detail below with reference to the figures and alternative embodiments.
As an embodiment of the present invention, a positive electrode sheet is disclosed, including a current collector, an undercoat layer, and a positive electrode material; the bottom coating is arranged on the surface of the current collector, and the positive electrode material is arranged on the bottom coating; wherein, in the bottom coating, the bottom coating comprises 70 to 98 percent of lithium iron phosphate, 0.5 to 15 percent of conductive agent, 0.5 to 15 percent of binder and 0.5 to 20 percent of thermosensitive material by mass percent.
The positive plate is applied to a battery, and the energy density and the safety are considered at the same time by arranging the bottom coating on the surface of the current collector. When the battery is short-circuited and overheated, referring to fig. 1, the thermosensitive material of the bottom coating rapidly expands to separate the conductive agent and the lithium iron phosphate particles in the bottom coating, so that the internal resistance of the bottom coating is sharply increased, and even approaches to an open circuit state to cut off a current loop and cut off an electronic path to a certain extent, the battery can be self-protected without independently arranging an insulating layer, heat generation is reduced, accidents are avoided to a certain extent, and the use safety of the battery is improved.
The positive electrode material may be a conventional electrode material, which is not described herein in detail. The current collector may be an aluminum foil or the like. The conductive agent may be a carbon nanotube and the binder may be. Specifically, the lithium iron phosphate can be 70%, 73%, 75%, 78%, 80%, 83%, 85%, 87%, 90%, 93%, 95%, 98%. The conductive agent may be 0.5%, 1%, 3%, 5%, 7%, 9%, 11%, 13%, 15%. The binder may be 0.5%, 1%, 3%, 5%, 7%, 9%, 11%, 13%, 15%. The thermosensitive material may be 0.5%, 1%, 3%, 5%, 7%, 9%, 11%, 13%, 15%, 17%, 20%.
Preferably, in the primer layer, the primer layer includes, in mass percent, the components: 70-98% of lithium iron phosphate, 3-9% of a conductive agent, 2-10% of a binder and 3-10% of a thermosensitive material.
Specifically, the heat-sensitive material comprises CaCO 3 、MgCO 3 、Ca(HCO 3 ) 2 、Mg(HCO 3 ) 2 One or more of thermal expansion composite resin, thermal expansion composite plastic, thermal expansion composite rubber and organic glass. The conductive agent can be conductive carbon black or carbon nano tube.
Specifically, the thickness of the undercoat layer is 0.5 to 30um. Preferably, the thickness of the primer layer is 1 to 10um, and the primer layer is too thin to exert an effective protective effect and too thick to reduce the battery capacity.
Specifically, the conductive agent is a carbon nano tube, the binder is polyvinylidene fluoride, and the thermosensitive material is one of thermal expansion composite resin, thermal expansion composite plastic and thermal expansion composite rubber; in the undercoat layer, the proportion of lithium iron phosphate is 75%, the proportion of polyvinylidene fluoride is 5%, the proportion of carbon nanotubes is 10%, and the proportion of thermally expandable composite resin, thermally expandable composite plastic or thermally expandable composite rubber is 10%, by mass. In the scheme, the needling pass rate is high, the internal short circuit bearing capacity of the battery is good, and the safety performance of the battery is high.
The invention also discloses a battery, which comprises the positive plate.
The invention also discloses a preparation method of the positive plate, which is applied to the positive plate and comprises the following steps:
adding the conductive agent into the adhesive solution of the adhesive in proportion, and stirring for 15-50min;
adding the heat-sensitive material in proportion, and stirring for 5-25min;
adding lithium iron phosphate according to a proportion, stirring for 20-50min, and controlling the viscosity at 1000-2500Mpa.s to obtain a primer coating slurry;
and coating the priming coating slurry on a current collector to obtain the positive plate.
Specifically, the coating thickness of the priming slurry is 0.5-30um, and the coating speed is 5-40 m/s.
Specifically, the step of coating the undercoat slurry on the current collector specifically comprises: and coating the base coating slurry on the current collector by a gravure base coating machine.
The conductive agent comprises conductive carbon black and carbon nanotubes, and the thermosensitive material comprises CaCO 3 、MgCO 3 、Ca(HCO 3 ) 2 And Mg (HCO) 3 ) 2 One or more of thermal expansion composite resin, thermal expansion composite plastic, thermal expansion composite rubber and organic glass;
when the positive plate is used for manufacturing a battery, the negative plate can select negative materials such as graphite, silicon carbon, hard carbon, lithium titanate, alkali metal and the like, the diaphragm is not limited to a solid electrolyte, a PP/PE diaphragm or a gel semisolid form, and the battery is assembled in a negative electrode/electrolyte/positive electrode active coating/positive electrode base coating/aluminum foil form.
Specifically, the battery referred to in the present invention may be a liquid battery, a solid battery, a gel battery, or the like; the battery may be an alkali metal element battery such as a lithium battery, a sodium battery, a potassium battery, or a mixed battery of two or more alkali metal elements.
The invention is further illustrated by the following specific examples.
Example 1: the preparation method is adopted to prepare the positive plate and prepare the battery. Specifically, the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive coating and a positive current collector, the positive current collector further comprises an aluminum foil and a bottom coating, and the bottom coating comprises lithium iron phosphate/a conductive agent/a binder/a thermosensitive material. Wherein, in the undercoat layer, the lithium iron phosphate proportion is 75% by mass, 10% 3 5% polyvinylidene fluoride (PVDF), 10% carbon nanotubes.
Example 2: the preparation method is adopted to prepare the positive plate and prepare the battery. Specifically, the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive coating and a positive current collector, the positive current collector further comprises an aluminum foil and a bottom coating, and the bottom coating comprises lithium iron phosphate, a conductive agent, a binder and a thermosensitive material. Wherein, in the undercoat layer, the proportion of lithium iron phosphate is 75% by mass, 10% by mass of CaCO 3 5% PVDF (polyvinylidene fluoride), 10% carbon nanotubes.
Example 3: the preparation method is adopted to prepare the positive plate and prepare the battery. Specifically, the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive coating and a positive current collector, the positive current collector further comprises an aluminum foil and a bottom coating, and the bottom coating comprises lithium iron phosphate, a conductive agent, a binder and a thermosensitive material. Wherein, in the undercoat layer, the lithium iron phosphate proportion was 75% by mass, 10% by mass of Ca (HCO) 3 ) 2 5% of PVDF,10% of carbon nanotubes.
Example 4: the preparation method is adopted to prepare the positive plate and prepare the battery. Specifically, the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive coating and a positive current collectorThe positive current collector further comprises aluminum foil and a primer layer, wherein the primer layer comprises lithium iron phosphate/a conductive agent/a binder/a thermosensitive material. Wherein, in the undercoat layer, the lithium iron phosphate proportion was 75% by mass, 10% by mass of Mg (HCO) 3 ) 2 5% PVDF,10% carbon nanotubes.
Example 5: the preparation method is adopted to prepare the positive plate and prepare the battery. Specifically, the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive coating and a positive current collector, the positive current collector further comprises an aluminum foil and a bottom coating, and the bottom coating comprises lithium iron phosphate, a conductive agent, a binder and a thermosensitive material. Wherein, in the undercoat layer, the proportion of lithium iron phosphate is 75% by mass, 5% by mass of CaCO 3 +5％MgCO 3 5% of PVDF,10% of carbon nanotubes.
Example 6: the preparation method is adopted to prepare the positive plate and prepare the battery. Specifically, the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive coating and a positive current collector, the positive current collector further comprises an aluminum foil and a bottom coating, and the bottom coating comprises lithium iron phosphate/a conductive agent/a binder/a thermosensitive material. Wherein, in the undercoat layer, the lithium iron phosphate proportion was 75% by mass, 5% by mass of Ca (HCO) 3 ) 2 +5％Mg(HCO 3 ) 2 5% of PVDF,10% of carbon nanotubes.
Example 7: the preparation method is adopted to prepare the positive plate and prepare the battery. Specifically, the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive coating and a positive current collector, the positive current collector further comprises an aluminum foil and a bottom coating, and the bottom coating comprises lithium iron phosphate, a conductive agent, a binder and a thermosensitive material. Wherein, in the undercoat layer, the proportion of lithium iron phosphate is 75% by mass, 10% by mass of the thermal expansion composite resin, 5% by mass of PVDF,10% by mass of carbon nanotubes.
Example 8: the preparation method is adopted to prepare the positive plate and prepare the battery. Specifically, the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive coating and a positive current collector, the positive current collector further comprises an aluminum foil and a bottom coating, and the bottom coating comprises lithium iron phosphate/a conductive agent/a binder/a thermosensitive material. Wherein, in the undercoat layer, the proportion of lithium iron phosphate is 75% by mass, 10% by mass of the thermal-expansion composite rubber, 5% by mass of PVDF, and 10% by mass of carbon nanotubes.
Example 9: the preparation method is adopted to prepare the positive plate and prepare the battery. Specifically, the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive coating and a positive current collector, the positive current collector further comprises an aluminum foil and a bottom coating, and the bottom coating comprises lithium iron phosphate/a conductive agent/a binder/a thermosensitive material. Wherein, in the undercoat layer, the proportion of lithium iron phosphate is 75% by mass, 10% by mass of the thermal-expandable composite plastic, 5% by mass of PVDF, and 10% by mass of carbon nanotubes.
Comparative example 1: the battery prepared by the comparative example comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate is only a conventional bottomless coated aluminum foil and a positive material coating.
Comparative example 2: the battery prepared by the comparative example comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate is only a mixed bottom coating of lithium iron phosphate and ceramic and a positive active material coating.
And (4) safety testing:
needle short circuit test: a needle punching Test (tail tunneling Test) was performed on examples 1 to 9, and this Test was an internal short circuit Test method and a safety Test for testing the internal short circuit withstand capability of a lithium ion battery. The specific test results are shown in the following table:
item Test pass rate
Example 1 8/10
Practice ofExample 2 8/10
Example 3 7/10
Example 4 8/10
Example 5 9/10
Example 6 9/10
Example 7 8/10
Example 8 9/10
Example 9 9/10
Comparative example 1 3/10
Comparative example 2 5/10
As can be seen from the above table, the puncture passing rates of examples 1 to 9 were all superior to those of comparative examples 1 and 2, indicating that the safety of the battery of the present invention was better. Specifically, the heat-expandable composite resin/heat-expandable composite rubber/heat-expandable composite plastic (examples 7 to 9) was used in the highest puncture throughput, and the mixed alkali metal salt (examples 5 to 6) as the heat-sensitive material was superior to the alkali metal-alone (examples 1 to 4) heat-sensitive material in puncture throughput.
It should be noted that, the limitations of the steps involved in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all should be considered to belong to the protection scope of the present disclosure.
The foregoing is a more detailed description of the invention in connection with specific alternative embodiments, and the practice of the invention should not be construed as limited to those descriptions. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.

Claims (10)

1. The positive plate is characterized by comprising a current collector, a bottom coating and a positive material; the undercoat layer is disposed on the current collector surface, and the positive electrode material is disposed on the undercoat layer; wherein, in the primer layer, the primer layer comprises the following components in percentage by mass:
Figure FDA0003827856110000011
2. the positive electrode sheet according to claim 1, wherein in the undercoat layer, the undercoat layer includes, in mass percent, components of:
Figure FDA0003827856110000012
3. the positive electrode sheet of claim 1, wherein the heat sensitive material comprises CaCO 3 、MgCO 3 、Ca(HCO 3 ) 2 、Mg(HCO 3 ) 2 One or more of thermal expansion composite resin, thermal expansion composite plastic, thermal expansion composite rubber and organic glass.
4. The positive electrode sheet according to claim 1, wherein the thickness of the primer layer is 0.5 to 30um.
5. The positive electrode sheet according to claim 4, wherein the thickness of the undercoat layer is 1 to 10um.
6. The positive electrode sheet according to claim 3, wherein the conductive agent is carbon nanotubes, the binder is polyvinylidene fluoride, and the heat-sensitive material is one of a heat-expandable composite resin, a heat-expandable composite plastic, and a heat-expandable composite rubber; in the primer layer, the proportion of the lithium iron phosphate is 75%, the proportion of the polyvinylidene fluoride is 5%, the proportion of the carbon nano tube is 10%, and the proportion of the thermal expansion composite resin, the thermal expansion composite plastic or the thermal expansion composite rubber is 10% by mass.
7. A battery comprising the positive electrode sheet according to any one of claims 1 to 6.
8. A positive electrode sheet production method applied to the positive electrode sheet according to any one of claims 1 to 6, characterized by comprising the steps of:
adding the conductive agent into the adhesive solution of the adhesive in proportion, and stirring for 15-50min;
adding the heat-sensitive material in proportion, and stirring for 5-25min;
adding lithium iron phosphate in proportion, stirring for 20-50min, and controlling the viscosity at 1000-2500Mpa.s to obtain a base coating slurry;
and coating the priming coating slurry on a current collector to obtain the positive plate.
9. The method according to claim 8, wherein the primer slurry is applied at a thickness of 0.5 to 30 μm and at a speed of 5 to 40m/s.
10. The preparation method according to claim 8, wherein the step of coating the undercoat slurry on the current collector is specifically:
and coating the base coating slurry on the current collector by a gravure base coating machine.
CN202211064759.7A 2022-09-01 2022-09-01 Positive plate, preparation method of positive plate and battery Pending CN115425171A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211064759.7A CN115425171A (en) 2022-09-01 2022-09-01 Positive plate, preparation method of positive plate and battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211064759.7A CN115425171A (en) 2022-09-01 2022-09-01 Positive plate, preparation method of positive plate and battery

Publications (1)

Publication Number Publication Date
CN115425171A true CN115425171A (en) 2022-12-02

Family

ID=84202605

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211064759.7A Pending CN115425171A (en) 2022-09-01 2022-09-01 Positive plate, preparation method of positive plate and battery

Country Status (1)

Country Link
CN (1) CN115425171A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116581243A (en) * 2023-07-12 2023-08-11 宁德时代新能源科技股份有限公司 Electrode plate, preparation method thereof, secondary battery and power utilization device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116581243A (en) * 2023-07-12 2023-08-11 宁德时代新能源科技股份有限公司 Electrode plate, preparation method thereof, secondary battery and power utilization device
CN116581243B (en) * 2023-07-12 2023-11-21 宁德时代新能源科技股份有限公司 Electrode plate, preparation method thereof, secondary battery and power utilization device

Similar Documents

Publication Publication Date Title
CN108777308B (en) Current collector, preparation method thereof and electrochemical energy storage device
CN109755463B (en) Electrode pole piece, electrochemical device and safety coating
US10020478B2 (en) Electrode with porous protective film, nonaqueous electrolyte secondary battery, and method for manufacturing electrode with porous protective film
CN108807819B (en) Diaphragm, preparation method thereof and lithium-sulfur battery
JP2018530873A (en) Negative electrode for secondary battery, method for producing the same, and secondary battery including the same
CN111564661A (en) High-safety lithium ion battery
WO2023151400A1 (en) Composite current collector and preparation method therefor, and lithium ion battery
TW201351766A (en) Collector, electrode structure, nonaqueous electrolyte battery and power storage component, and method for producing collector
CN111785925A (en) Pole piece, application and low-temperature-rise safety lithium ion battery containing pole piece
CN111640949B (en) Current collector, electrode plate, electrochemical device and electronic device
CN108011067A (en) A kind of membrane configuration
CN105958112A (en) Non-diaphragm lithium ion battery coiled core and preparation method therefor
CN115425171A (en) Positive plate, preparation method of positive plate and battery
CN109167099B (en) High-safety battery and preparation method thereof
CN111900343A (en) Positive pole piece and preparation method and application thereof
CN108023051B (en) Isolation film and lithium ion battery containing same
CN215896445U (en) Positive pole piece, lithium ion battery and power utilization device
WO2023246704A1 (en) Lithium-ion battery electrode plate and preparation method therefor
CN113690404A (en) Foaming coating, pole piece and lithium ion battery
CN112701244A (en) Safety liquid, preparation method thereof, material with safety coating and application
CN111900342A (en) Positive pole piece and preparation method and application thereof
CN212461732U (en) Current collector, pole piece and battery
JP6917765B2 (en) Bipolar secondary battery
CN106910942A (en) Lithium secondary battery
CN114883575A (en) Lithium ion battery and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination