CN113922004A - Battery and electronic device - Google Patents
Battery and electronic device Download PDFInfo
- Publication number
- CN113922004A CN113922004A CN202111153158.9A CN202111153158A CN113922004A CN 113922004 A CN113922004 A CN 113922004A CN 202111153158 A CN202111153158 A CN 202111153158A CN 113922004 A CN113922004 A CN 113922004A
- Authority
- CN
- China
- Prior art keywords
- curing agent
- battery
- safety coating
- current collector
- pole piece
- Prior art date
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- Pending
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/494—Tensile strength
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a battery and an electronic device. The invention provides a battery, which comprises a pole piece formed by winding from inside to outside, wherein the pole piece which is close to the winding center and is oppositely arranged comprises a current collector and a safety coating, the safety coating is arranged on the functional surface of the current collector close to the winding center, and the safety coating comprises a curing agent and a hydrophobic organic silicon compound. According to the invention, the safety coating is arranged on the surface of the current collector, so that the safety of the battery is improved.
Description
Technical Field
The invention relates to a battery and an electronic device, and relates to the technical field of electrochemistry.
Background
Batteries are widely used in various industries because of their advantages of simple structure, convenience in carrying, and stable and reliable performance. In order to meet the requirements of high endurance and long standby time, batteries are also continuously developed toward high energy density.
In order to obtain higher energy density, a hot-pressing forming process is generally adopted, so that the bonding surface of the pole piece is more compact, and the thickness of the battery is reduced.
Disclosure of Invention
The invention provides a battery, which is used for relieving the problem of plastic deformation of a pole piece caused by a hot-pressing process.
The invention also provides an electronic device comprising the battery.
The invention provides a battery, which comprises a pole piece formed by winding from inside to outside, wherein:
the pole piece which is close to the winding center and is oppositely arranged comprises a current collector and a safety coating, the safety coating is arranged on the functional surface of the current collector close to the winding center, and the safety coating comprises a hydrophobic organic silicon compound and a curing agent.
As known to those skilled in the art, a conventional battery includes a positive plate, a separator and a pole piece, the separator is located between the positive plate and the negative plate and is used for isolating the positive plate from the negative plate and preventing the battery from short circuit, for example, fig. 1 is a schematic structural diagram of a battery provided by the prior art, as shown in fig. 1, the battery includes a positive plate, a separator (not shown in the figure) and a negative plate which are wound from inside to outside, according to the winding manner of the pole piece, the head of the pole piece is defined as the winding center, for example, a flat pole piece is prepared according to the conventional technical means in the art, and the structure shown in fig. 1 is wound from one side (the head) of the pole piece as the winding center along the length direction of the pole piece, in the structure shown in fig. 1, the oppositely arranged pole piece is the negative plate, that is at a position close to the winding center, the negative plate has two oppositely arranged planes, and there is no other pole piece in the middle, as can be seen from fig. 1, the wound negative pole piece is divided into a straight area and an arc area, the pole pieces of the first plane and the first arc surface from the winding center only include the negative current collector 201, the second plane includes the negative current collector 201 and the negative active layer 202 disposed on the functional surface of the negative current collector far away from the winding center, the pole pieces from the second arc area to the tail portion all include the negative current collector 201 and the negative active layer 202 disposed on the two functional surfaces of the negative current collector, the functional surfaces of the negative current collector 201 near the winding center from the first straight area to the second straight area are not covered by the negative active layer 202, the functional surfaces refer to two opposite surfaces of the negative current collector with a larger area, and are used for loading the negative active layer, specifically refer to the upper surface and the lower surface of the negative current collector. For example, fig. 2 is an enlarged schematic diagram of the arc regions before and after the artificial simulation of the pole piece hot pressing, wherein a is an enlarged schematic diagram of the arc region of the pole piece before the hot pressing, and b is a schematic diagram of the arc region of the pole piece after the hot pressing, as shown in fig. 2, the negative pole piece located in the arc region has undergone plastic deformation (as shown by the dotted line in the b), so that the present invention provides a battery, in which an elastic safety coating is disposed on the surface of the pole piece close to the winding center and oppositely disposed, so as to reduce the influence of the hot pressing on the pole piece, specifically, fig. 3 is a schematic diagram of the structure of the battery provided by an embodiment of the present invention, as shown in fig. 3, the pole piece close to the winding center and oppositely disposed is a negative pole piece, the negative pole piece includes a negative pole current collector 201 and a safety coating 203 disposed on the surface of the negative pole current collector 201 close to the winding center, fig. 4 is a schematic structural diagram of the pole piece provided in an embodiment of the present invention, as shown in fig. 4, after the winding-formed negative pole piece is straightened, the negative pole piece includes the negative pole current collector 201, a negative pole active layer 202 and the safety coating 203, the direction indicated by the arrow below the fig. 4 is the winding direction of the pole piece, that is, the pole piece is wound from one side of the safety coating 203, and the surface of the safety coating 203 is the surface close to the winding center, it can be understood that the present invention is explained by taking the negative pole piece as an example, and according to the difference of the structural design of the battery, the pole piece located in the winding center and oppositely disposed may also be a positive pole piece; the safety coating 203 comprises a curing agent and a hydrophobic organic silicon compound, so that the safety coating 203 has certain elasticity, the elastic capacity of the pole piece close to the winding center can be effectively enhanced, and the pole piece can be recovered to the original state after the hot-pressing formation process, so that the interface cohesiveness is not changed, and the problem of plastic deformation of the pole piece is solved; in addition, the safety coating has certain elasticity and thickness, so that the separator is prevented from being punctured by burrs generated by tearing of the current collector, and the short circuit of the battery is avoided; finally, when the battery is dropped, extruded and other mechanical abuse conditions occur, the safety coating can also play a role in buffering, so that the internal structure of the battery core is protected. In conclusion, the safety coating is arranged on the surface of the current collector, so that the safety of the battery is improved.
In a specific embodiment, the pole piece disposed close to and opposite to the winding center further includes an active layer disposed on at least a portion of the functional surface of the current collector away from the winding center.
With reference to fig. 3, according to different design requirements of the winding core, the negative electrode sheet disposed close to and opposite to the winding center further includes a negative electrode active layer 202, and the negative electrode active layer 202 is located on the functional surface of the negative electrode current collector 201 away from the winding center.
In order to further take the energy density and the safety performance of the battery into consideration, the thickness of the safety coating is 0.1-100% of the thickness of the active layer. Note that the thickness of the active layer here is the thickness of the active layer on one functional surface of the current collector.
Experimental research shows that when the mass fractions of the hydrophobic organic silicon compound and the curing agent in the safety coating are different, the elastic performance of the safety coating is different, and the effect of relieving the deformation of the pole piece is different, and a person skilled in the art can adjust the content of each component in the safety coating according to needs, specifically, the safety coating comprises 40-90% of the hydrophobic organic silicon compound and 10-60% of the curing agent by mass percent.
In order to further relieve the problem of pole piece deformation, the safety coating comprises 60-70% of hydrophobic organic silicon compound and 30-40% of curing agent by mass percent.
The hydrophobic organosilicon compound is a hydrophobic compound containing Si-C bonds and at least one organic group directly connected with silicon atoms, and specifically comprises one or more of polydimethylsiloxane, cyclomethicone, aminomethyl siloxane, polymethylphenyl siloxane and polyether polysiloxane.
The curing agent is mainly used for regulating and controlling the curing of the hydrophobic organic silicon compound, and specifically comprises one or more of aliphatic amine curing agent, aromatic amine curing agent, amido amine curing agent and latent curing amine.
Further, the aliphatic amine curing agent includes one or more of vinyl triamine, aminoethyl piperazine, diaminocyclohexane, ethylene diamine, methylene dicyclohexylamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine, polyethylene polyamine, dipropylene triamine, dimethylamino propylamine, diethylaminopropylamine, trimethyl hexamethylene diamine, dihexyl triamine, hexamethylene diamine modification, hexamethylene diamine addition, hexamethylene diamine, trimethyl hexamethylene diamine, diethyl amine, and polyether diamine;
and/or the aromatic amine curing agent comprises one or more of m-phenylenediamine, m-xylylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone, m-aminomethane, benzidine, chlorophthalimide, xylylenediamine trimer derivatives, dibenzylidene ether, a mixture of m-phenylenediamine and diaminodiphenylmethanee, m-phenylenediamine and methylenebisphenyldiamine;
and/or the latent curing amine curing agent comprises dicyandiamide.
The preparation method of the security coating may refer to an active layer, that is, a security coating slurry obtained by mixing a curing agent and a hydrophobic organic silicon compound and coating the security coating slurry on the surface of a current collector, but the inventors found that a large amount of bubbles exist in the security coating slurry, which may cause unevenness of the surface of the security coating if directly coated, and thus, the security coating is prepared by: and mixing a curing agent and a hydrophobic organic silicon compound to obtain a safety coating slurry, removing bubbles in the safety coating slurry, and coating the mixture on the surface of the current collector to obtain the safety coating.
The current collector and the active layer can be performed according to the conventional technical means in the field, for example, when the pole piece is a negative pole piece, the negative pole current collector can be a copper foil, and the negative pole active layer comprises 90% -98.5% of negative pole active material, 0% -5% of conductive agent and 0% -5% of binder, wherein the negative pole active material is selected from one or more of natural graphite, artificial graphite, silicon-based material, alloy material and tin-gold material; the conductive agent is selected from one or more of conductive carbon black, acetylene black, Ketjen black, conductive graphite, conductive carbon fiber, carbon nanotube, metal powder and carbon fiber; the binder is selected from one or more of polyvinylidene fluoride (PVDF), Polytetrafluoroethylene (PTFE) and lithium Polyacrylate (PAALi).
The preparation method of the negative active layer comprises the following steps: and uniformly dispersing the negative electrode active material, the conductive agent and the binder in a solvent to prepare negative electrode active layer slurry, and uniformly coating the negative electrode active layer slurry on the surface of a negative electrode current collector to obtain a negative electrode active layer, wherein the coating mode comprises one or more of extrusion coating, transfer coating and roller coating.
The coating sequence and the coating area of the cathode active layer slurry and the safety coating slurry can be adjusted according to actual production needs, which is not limited in the present invention.
When the pole piece is a positive pole piece, the positive pole piece comprises a positive pole current collector 101 and a positive pole active layer 102 arranged on the surface of the positive pole current collector, wherein the positive pole current collector comprises one or more of an aluminum foil, a microporous aluminum foil and an aluminum-plated film; the positive active layer comprises 90-98.5% of positive active material, 0-5% of conductive agent and 0-5% of binder, the positive active material comprises one or more of lithium cobalt phosphate, lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium nickel cobalt aluminate or lithium iron manganese phosphate, and the conductive agent and the binder are selected from the negative active layer.
The preparation method of the positive active layer comprises the following steps: and uniformly dispersing the positive active substance, the conductive agent and the binder in a solvent to prepare positive active layer slurry, uniformly coating the positive active layer slurry on the surface of a positive current collector to obtain a positive active layer, and finally baking and rolling to obtain the positive plate.
The battery further includes a positive electrode tab 300, a negative electrode tab 400, and a separator, the tabs are metallic conductors that lead the positive electrode and the negative electrode out of the roll core, and are divided into the positive electrode tab, which is generally made of aluminum, and the negative electrode tab, which is generally made of copper.
The diaphragm is positioned between the positive plate and the pole piece, mainly plays a role in isolating the positive and negative electrodes and preventing the positive and negative electrodes from contacting to further cause short circuit, and is selected from common battery diaphragms such as a water system diaphragm, a macroporous oil precipitation battery, a gravure oil system battery and the like.
In conclusion, the safety coating with certain elasticity is arranged on the basis of the existing battery structure, so that the elasticity of the pole piece close to the winding center can be effectively enhanced, and the pole piece can be recovered to the original state after the hot-pressing formation process, so that the interface cohesiveness is not changed, and the problem of pole piece deformation is solved; in addition, the safety coating has certain elasticity and thickness, so that the separator is prevented from being punctured by burrs generated by tearing of the current collector, and the problem of short circuit of the battery is avoided; finally, when the battery is dropped, extruded and other mechanical abuse conditions occur, the safety coating can also play a role in buffering, so that the internal structure of the battery core is protected.
The second aspect of the invention provides an electronic device comprising the battery provided by the first aspect of the invention. The present invention is not limited to the kind of electronic device, and may specifically include, but is not limited to, a mobile phone, a notebook computer, an electric vehicle, an electric bicycle, a digital camera, and the like.
The implementation of the invention has at least the following advantages:
1. the invention is provided with the safety coating with certain elasticity on the basis of the existing battery structure, can effectively enhance the elasticity of the pole piece positioned in the head arc area, and ensures that the pole piece can be restored to the original state after the hot-pressing formation process so that the interface cohesiveness is not changed, thereby improving the safety of the battery.
2. The safety coating helps to prevent the current collector from being torn to generate burrs to puncture the diaphragm, so that the problem of short circuit of the battery is avoided.
3. When the battery falls, is extruded and the like under mechanical abuse conditions, the safety coating can also play a role in buffering, so that the internal structure of the battery core is protected.
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 view of a battery provided in the prior art;
FIG. 2 is an enlarged schematic view of the arc regions before and after hot pressing of the simulation pole piece;
fig. 3 is a schematic structural diagram of a battery according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pole piece according to an embodiment of the present invention.
Description of reference numerals:
101-a positive current collector;
102-positive active layer;
201-negative current collector;
202-negative active layer;
203-a security coating;
300-positive pole tab;
400-negative pole tab.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 invention.
The hydrophobic organosilicon compound used in the following examples is Dow Corning 184, with a matched curing agent.
Example 1
The present embodiment provides a battery, the structure of which is shown in fig. 3, specifically:
the negative plate comprises a negative current collector copper foil, a safety coating and a negative active layer, wherein the negative active layer comprises 96.5 parts by mass of graphite, 0.5 part by mass of conductive agent and 3 parts by mass of binder, and the safety coating comprises 40 parts by mass of hydrophobic organic silicon compound and 60 parts by mass of curing agent.
The preparation process of the negative plate comprises the following steps: preparing negative active layer slurry according to the mass fraction, coating the negative active layer slurry on the surface of a negative current collector to obtain a negative active layer, mixing a hydrophobic organic silicon material and a curing agent to prepare a safe coating slurry, removing bubbles, coating the safe coating slurry on the head area of the negative current collector, and rolling and drying to obtain a pole piece;
the positive plate comprises a positive current collector aluminum foil and a positive active layer, wherein the positive active layer comprises 97.8 parts by mass of lithium cobaltate, 1.1 parts by mass of a conductive agent and 1.1 parts by mass of a binder.
The preparation process of the positive plate comprises the following steps: and preparing the slurry of the positive active layer according to the mass fraction, coating the slurry on the surface of a positive current collector, and rolling and drying to obtain the positive plate.
Example 2
The battery provided in this example can be referred to example 1 except that the safety coating layer includes 50 parts by mass of the hydrophobic organic silicon compound and 50 parts by mass of the curing agent.
Example 3
The battery provided in this example can be referred to example 1 except that the safety coating layer includes 60 parts by mass of the hydrophobic organic silicon compound and 40 parts by mass of the curing agent.
Example 4
The battery provided in this example can be referred to example 1 except that the safety coating layer includes 70 parts by mass of the hydrophobic organic silicon compound and 30 parts by mass of the curing agent.
Example 5
The battery provided in this example can be referred to example 1 except that the safety coating layer includes 80 parts by mass of the hydrophobic organic silicon compound and 20 parts by mass of the curing agent.
Example 6
The battery provided in this example can be referred to example 1 except that the safety coating layer includes 90 parts by mass of the hydrophobic organic silicon compound and 10 parts by mass of the curing agent.
Comparative example 1
The present comparative example provides a battery that can be referenced to example 1, except that the pole piece does not include a safety coating.
The lithium ion batteries provided in examples 1 to 6 and comparative example 1 were subjected to a lithium analysis test, which specifically includes: in each example, ten groups of test samples were prepared and subjected to charge-discharge cycles, wherein the charge cycle was 1C to 4.35V, the discharge cycle was 1C to 3V, the battery was dissected after 20 cycles, whether lithium deposition occurred on the surface of the electrode plate, particularly the negative electrode plate located in the arc region, was observed, the number of batteries in which lithium deposition occurred and in which lithium deposition did not occur was counted, and the percent of pass (%) was calculated.
Table 1 results of lithium extraction tests of batteries provided in examples 1 to 6 and comparative example 1
| Separating lithium | Does not separate out lithium | Percent of pass | |
| Example 1 | 1 | 9 | 90％ |
| Example 2 | 1 | 9 | 90％ |
| Example 3 | 0 | 10 | 100％ |
| Example 4 | 0 | 10 | 100％ |
| Example 5 | 1 | 9 | 90％ |
| Example 6 | 1 | 9 | 90％ |
| Comparative example 1 | 8 | 2 | 20％ |
As can be seen from table 1, compared with comparative example 1, the lithium precipitation of the batteries provided in examples 1 to 6 is significantly alleviated, and the yield is higher, which indicates that the provision of the safety coating on the surface of the current collector helps to improve the lithium precipitation of the negative electrode sheet; according to the data provided in examples 1 to 6, it can be seen that the different mass fractions of the hydrophobic organosilicon compound and the curing agent lead to different elastic properties of the safety coating and different rebound effects after hot pressing, and further lead to different lithium analysis conditions of the battery, and when the mass fraction of the hydrophobic organosilicon compound is 60% to 70% and the mass fraction of the curing agent is 30% to 40%, the lithium analysis condition of the pole piece is greatly relieved, and the safety performance of the battery is higher.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled 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 invention.
Claims (10)
1. A battery comprising a pole piece wound from the inside to the outside, wherein:
the pole piece which is close to the winding center and is oppositely arranged comprises a current collector and a safety coating, the safety coating is arranged on the functional surface of the current collector close to the winding center, and the safety coating comprises a hydrophobic organic silicon compound and a curing agent.
2. The battery of claim 1, wherein the oppositely disposed pole pieces near the winding center further comprise an active layer disposed on at least a portion of the functional surface of the current collector away from the winding center.
3. The battery according to claim 2, wherein the safety coating has a thickness of 0.1-100% of the thickness of the active layer.
4. The battery according to any one of claims 1 to 3, wherein the safety coating layer comprises 40 to 90 mass% of the hydrophobic organosilicon compound and 10 to 60 mass% of the curing agent.
5. The battery according to any one of claims 1 to 3, wherein the safety coating layer comprises 60 to 70 mass% of the hydrophobic organosilicon compound and 30 to 40 mass% of the curing agent.
6. The cell according to any one of claims 1 to 5, wherein the hydrophobic organosilicon compound comprises one or more of polydimethylsiloxane, cyclomethicone, aminomethylsiloxane, polymethylphenylsiloxane, polyether polysiloxane.
7. The battery of any of claims 1-5, wherein the curing agent comprises one or more of an aliphatic amine curing agent, an aromatic amine curing agent, an amidoamine curing agent, and a latent curing amine curing agent.
8. The battery of claim 7, wherein the aliphatic amine based curing agent comprises one or more of vinyl triamine, aminoethyl piperazine, diaminocyclohexane, ethylene diamine, methylene dicyclohexylamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine, polyethylene polyamine, dipropylene triamine, dimethylamino propylamine, diethylaminopropylamine, trimethyl hexamethylene diamine, dihexyl triamine, hexamethylene diamine modification, hexamethylene diamine addition, hexamethylene diamine, trimethyl hexamethylene diamine, diethylamine, and polyether diamine;
and/or the aromatic amine curing agent comprises one or more of m-phenylenediamine, m-xylylenediamine, diaminodiphenylmethane, diaminodiphenylsulfone, m-aminomethane, benzidine, chlorophthalimide, xylylenediamine trimer derivatives, dibenzylidene ether, a mixture of m-phenylenediamine and diaminodiphenylmethanee, m-phenylenediamine and methylenebisphenyldiamine;
and/or the latent curing amine curing agent comprises dicyandiamide.
9. The battery according to any one of claims 1 to 8, wherein the safety coating is prepared by: and mixing a curing agent and a hydrophobic organic silicon compound to obtain a safety coating slurry, removing bubbles in the safety coating slurry, and coating the mixture on the surface of the current collector to obtain the safety coating.
10. An electronic device comprising the battery according to any one of claims 1 to 9.
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| CN112467231A (en) * | 2021-02-04 | 2021-03-09 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery, and method and apparatus for manufacturing electrode assembly |
| CN112670442A (en) * | 2020-12-24 | 2021-04-16 | 珠海冠宇电池股份有限公司 | Positive plate, battery roll core, battery and positive plate preparation method |
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| KR100709863B1 (en) * | 2005-12-27 | 2007-04-23 | 삼성에스디아이 주식회사 | Secondary battery |
| CN109301354A (en) * | 2018-10-19 | 2019-02-01 | 武汉中原长江科技发展有限公司 | A method of it effectively prevent lithium battery anode to be broken in winding process |
| CN111725569A (en) * | 2020-06-24 | 2020-09-29 | 珠海冠宇电池股份有限公司 | Roll up core and battery |
| CN112670442A (en) * | 2020-12-24 | 2021-04-16 | 珠海冠宇电池股份有限公司 | Positive plate, battery roll core, battery and positive plate preparation method |
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