CN110676414A - Preparation method of isolating membrane ceramic coating - Google Patents
Preparation method of isolating membrane ceramic coating Download PDFInfo
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- CN110676414A CN110676414A CN201910715632.9A CN201910715632A CN110676414A CN 110676414 A CN110676414 A CN 110676414A CN 201910715632 A CN201910715632 A CN 201910715632A CN 110676414 A CN110676414 A CN 110676414A
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- H—ELECTRICITY
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- 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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/08—Oxides
- C23C14/081—Oxides of aluminium, magnesium or beryllium
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/08—Oxides
- C23C14/083—Oxides of refractory metals or yttrium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/10—Glass or silica
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/20—Metallic material, boron or silicon on organic substrates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
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- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
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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
- 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
- H01M50/431—Inorganic material
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- 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
- H01M50/44—Fibrous material
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- 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
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of an isolating membrane ceramic coating, which comprises the following steps of unreeling, mounting an isolating membrane substrate coil material in a vacuum evaporation machine and vacuumizing; step two, heating: heating the ceramic plating material to a gas state and conveying the ceramic plating material to the vacuum evaporation machine in the first step; step three, plating a ceramic layer: driving the isolating film substrate coil material in the first step to feed, and cooling to plate the gaseous ceramic plating material on the isolating film substrate coil material; step four, rolling: and (5) measuring the thickness of the isolating film substrate roll in the third step and rolling. Compared with the prior art, the method has the advantages that the ceramic layer is subjected to vacuum evaporation, so that the gaseous ceramic plating material is cooled and desublimed on the isolating membrane substrate coil, a uniform, stable and compact plating layer is further formed, and the bonding degree between the isolating membrane and the ceramic plating material is enhanced, so that the thickness of the plating layer can be effectively reduced, and the energy density and the safety of the battery are improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a manufacturing method of an isolating membrane coating.
Background
With the continuous development of communication technology and the arrival of the 5G era, the functions of mobile devices such as mobile phones and tablet computers are becoming more and more abundant, and accordingly, the power consumption of these devices is also increasing, which requires that lithium ion batteries have higher and higher energy density and certain safety performance.
The separator is one of the inner components of the lithium ion battery, and mainly has the functions of separating the positive electrode from the negative electrode of the battery, preventing the short circuit caused by the contact of the two electrodes, and enabling electrolyte ions to pass through. The performance of the separator determines the interface structure, internal resistance, etc. of the battery, and directly affects the characteristics of the battery, such as energy density, cycle, safety performance, etc. In order to improve the thermal stability of the diaphragm, a layer of heat-resistant coating made of ceramic materials is coated on the surface of the diaphragm in the current industry to reduce the thermal shrinkage performance of the diaphragm, so that the problem of thermal runaway of the lithium ion battery is solved. However, due to the limitation of ceramic plating materials and gravure coating processes, the ceramic coating on the isolation film can only be about 2um at the lowest, and cannot be further compressed in thickness to increase the internal space of the battery so as to improve the energy density and safety of the battery.
In view of the above, there is a need for further improvements in the process of ceramic coating to meet practical needs.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the preparation method of the isolating membrane ceramic coating adopts a vacuum evaporation mode to replace the traditional gravure coating mode, enhances the combination degree between the isolating membrane and the ceramic coating material, effectively reduces the thickness of the coating and improves the energy density and the safety of the battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a ceramic coating of an isolating membrane comprises the following steps:
step one, unreeling: mounting the isolating film substrate coil material in a vacuum evaporation machine and vacuumizing;
step two, heating: heating the ceramic plating material to a gas state and conveying the ceramic plating material to the vacuum evaporation machine in the first step;
step three, plating a ceramic layer: driving the isolating film substrate coil material in the first step to feed, and cooling to plate the gaseous ceramic plating material on the isolating film substrate coil material;
step four, rolling: and (5) measuring the thickness of the isolating film substrate roll in the third step and rolling.
Wherein, the ceramic plating material is heated by heating the evaporation boat of the vacuum evaporation plating machine, and when the temperature reaches the evaporation temperature of the ceramic plating material, the ceramic plating material is continuously fed into the evaporation boat to be evaporated into a gaseous state. And when the ceramic coating is carried out in the third step, the thickness of the ceramic coating reaches the specified requirement mainly by controlling the feeding speed and the vacuum degree of the gaseous ceramic coating material and the winding and unwinding speed of the isolating film substrate coil material.
As an improvement of the preparation method of the ceramic coating of the isolating membrane in the invention, the material of the isolating membrane substrate in the first step is any one of a polyethylene membrane, a polypropylene and polyethylene composite membrane, a polyester membrane, a cellulose membrane, a polyimide membrane, a polyamide membrane, a spandex membrane and an aramid membrane. The polyolefin materials such as the polyethylene film, the polypropylene and polyethylene composite film and the like have the advantages of high strength, good acid and alkali corrosion resistance, water resistance, chemical reagent resistance, good biocompatibility, no toxicity and the like, are mature in industrial preparation, and can be reasonably selected according to actual conditions.
As an improvement of the preparation method of the isolating membrane ceramic coating, the thickness of the isolating membrane substrate coil in the first step is 3-20 um. The isolating membrane cannot be too thick or too thin, and because of the mechanical requirements of the isolating membrane in the preparation and subsequent assembly processes, if the thickness is too small, the assembly error of the isolating membrane is easily increased, so that the quality of the isolating membrane is influenced, and in addition, the safety performance of the isolating membrane is also influenced; if the thickness is too large, an excessive amount of internal space of the battery is occupied, resulting in a decrease in energy density of the battery.
As an improvement of the preparation method of the isolating membrane ceramic coating, the thickness of the isolating membrane substrate coil in the first step is 8-16 um. This thickness range enables the above-mentioned effects to be optimized.
As an improvement of the preparation method of the isolating membrane ceramic coating, the first step further comprises the step of carrying out plasma pretreatment on the surface of the isolating membrane substrate roll. The step mainly aims at the isolation film base material roll made of polyolefin materials such as polyethylene or polypropylene, the polyethylene and the polypropylene are nonpolar materials, so the adhesion between the isolation film base material roll and ceramics is poor, and the isolation film base material roll can be improved after plasma pretreatment.
As an improvement of the preparation method of the isolating membrane ceramic coating, the vacuum degree range of the vacuum evaporator in the step one is 0.4-80 kpa.
As an improvement of the preparation method of the ceramic coating of the isolating membrane in the invention, the ceramic coating material in the second step is any one of silicon, silicon oxide, silicon monoxide, aluminum oxide, titanium oxide, magnesium hydroxide and hydrated aluminum oxide.
As an improvement of the preparation method of the isolating membrane ceramic coating, the heating temperature in the second step is 800-4000 ℃. The temperature range is effective to evaporate the ceramic plating material and form a gaseous state.
As an improvement of the preparation method of the isolating membrane ceramic coating, the feeding speed of the gaseous ceramic coating in the step two is 0.05-5 g/min. The feeding speed cannot be too fast or too slow, and if the feeding speed is too fast, the ceramic plating material can be sublimated too fast, so that the ceramic plating material layer is too thick, and the condition of uneven thickness is easy to occur; if the speed is too slow, the production efficiency will be affected and the productivity will be reduced.
As an improvement of the preparation method of the isolating membrane ceramic coating, the feeding and winding speeds of the coiled material of the membrane substrate are both 50-200 m/min. The winding speed and the feeding speed of the isolating film substrate roll material need to be matched with the feeding speed of the gaseous ceramic plating material, and cannot be too slow or too fast, if the winding speed is too slow, the ceramic plating layer thickness is too thick, the production efficiency is influenced, and the productivity is reduced; if the thickness is too fast, the thickness of the ceramic coating is too thin, and the thickness is not uniform, which affects the quality of the isolation film.
The invention has the beneficial effects that: compared with the traditional gravure coating ceramic coating, the method adopts a vacuum evaporation method to cool and desublimate the gaseous ceramic coating on the isolating film substrate coil, so as to form a uniform, stable and compact coating and enhance the bonding degree between the isolating film and the ceramic coating, thereby effectively reducing the thickness of the coating and improving the energy density and the safety of the battery.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
A preparation method of a ceramic coating of an isolating membrane comprises the following steps:
step one, unreeling: mounting a polyethylene film coil stock with the thickness of 9um on a vacuum evaporation machine and vacuumizing, wherein the vacuum degree is 0.4 kpa;
step two, heating: heating the alumina to a gas state and conveying the alumina to the vacuum evaporation machine in the first step, wherein the feeding speed is 0.05 g/min;
step three, plating a ceramic layer: driving a polyethylene film coil stock to feed, and cooling to plate gaseous aluminum oxide on the polyethylene film coil stock;
step four, rolling: and (4) measuring the thickness of the polyethylene film coil stock in the third step and rolling, wherein the rolling and unrolling speed is 200 m/min.
The resulting separator was tested for a thickness of 9.1 um.
Example 2
A preparation method of a ceramic coating of an isolating membrane comprises the following steps:
step one, unreeling: mounting a polyethylene film coil stock with the thickness of 9um on a vacuum evaporation machine and vacuumizing, wherein the vacuum degree is 0.5 kpa;
step two, heating: heating the alumina to a gas state and conveying the alumina to the vacuum evaporation machine in the first step, wherein the feeding speed is 0.1 g/min;
step three, plating a ceramic layer: driving a polyethylene film coil stock to feed, and cooling to plate gaseous aluminum oxide on the polyethylene film coil stock;
step four, rolling: and (4) measuring the thickness of the polyethylene film coil stock in the third step and rolling, wherein the rolling and unrolling speed is 150 m/min.
The resulting separator was tested for a thickness of 9.2 um.
Example 3
A preparation method of a ceramic coating of an isolating membrane comprises the following steps:
step one, unreeling: mounting a polyethylene film coil stock with the thickness of 9um on a vacuum evaporation machine and vacuumizing, wherein the vacuum degree is 1 kpa;
step two, heating: heating the alumina to a gas state and conveying the alumina to the vacuum evaporation machine in the first step, wherein the feeding speed is 0.5 g/min;
step three, plating a ceramic layer: driving a polyethylene film coil stock to feed, and cooling to plate gaseous aluminum oxide on the polyethylene film coil stock;
step four, rolling: and (4) measuring the thickness of the polyethylene film coil stock in the third step and rolling, wherein the rolling and unrolling speed is 120 m/min.
The resulting separator was tested for a thickness of 9.4 um.
Example 4
A preparation method of a ceramic coating of an isolating membrane comprises the following steps:
step one, unreeling: mounting a polyethylene film coil stock with the thickness of 9um on a vacuum evaporation machine and vacuumizing, wherein the vacuum degree is 5 kpa;
step two, heating: heating the alumina to a gas state and conveying the alumina to the vacuum evaporation machine in the first step, wherein the feeding speed is 1 g/min;
step three, plating a ceramic layer: driving a polyethylene film coil stock to feed, and cooling to plate gaseous aluminum oxide on the polyethylene film coil stock;
step four, rolling: and (4) measuring the thickness of the polyethylene film coil stock in the third step and rolling, wherein the rolling and unrolling speed is 100 m/min.
The resulting separator was tested for a thickness of 9.5 um.
Example 5
A preparation method of a ceramic coating of an isolating membrane comprises the following steps:
step one, unreeling: mounting a polyethylene film coil stock with the thickness of 9um on a vacuum evaporation machine and vacuumizing, wherein the vacuum degree is 7 kpa;
step two, heating: heating the alumina to a gas state and conveying the alumina to the vacuum evaporation machine in the first step, wherein the feeding speed is 2 g/min;
step three, plating a ceramic layer: driving a polyethylene film coil stock to feed, and cooling to plate gaseous aluminum oxide on the polyethylene film coil stock;
step four, rolling: and (4) measuring the thickness of the polyethylene film coil stock in the third step and rolling, wherein the rolling and unrolling speed is 80 m/min.
The resulting separator was tested for a thickness of 9.8 um.
Example 6
A preparation method of a ceramic coating of an isolating membrane comprises the following steps:
step one, unreeling: mounting a polyethylene film coil stock with the thickness of 9um on a vacuum evaporation machine and vacuumizing, wherein the vacuum degree is 8 kpa;
step two, heating: heating the alumina to a gas state and conveying the alumina to the vacuum evaporation machine in the first step, wherein the feeding speed is 2.5 g/min;
step three, plating a ceramic layer: driving a polyethylene film coil stock to feed, and cooling to plate gaseous aluminum oxide on the polyethylene film coil stock;
step four, rolling: and (4) measuring the thickness of the polyethylene film coil stock in the third step and rolling, wherein the rolling and unrolling speed is 120 m/min.
The resulting separator was tested for a thickness of 9.8 um.
Example 7
A preparation method of a ceramic coating of an isolating membrane comprises the following steps:
step one, unreeling: mounting a polyethylene film coil stock with the thickness of 9um on a vacuum evaporation machine and vacuumizing, wherein the vacuum degree is 10 kpa;
step two, heating: heating the alumina to a gas state and conveying the alumina to the vacuum evaporation machine in the first step, wherein the feeding speed is 3 g/min;
step three, plating a ceramic layer: driving a polyethylene film coil stock to feed, and cooling to plate gaseous aluminum oxide on the polyethylene film coil stock;
step four, rolling: and (4) measuring the thickness of the polyethylene film coil stock in the third step and rolling, wherein the rolling and unrolling speed is 70 m/min.
The resulting separator was tested for a thickness of 9.3 um.
Example 8
A preparation method of a ceramic coating of an isolating membrane comprises the following steps:
step one, unreeling: mounting a polyethylene film coil stock with the thickness of 9um on a vacuum evaporation machine and vacuumizing, wherein the vacuum degree is 80 kpa;
step two, heating: heating the alumina to a gas state and conveying the alumina to the vacuum evaporation machine in the first step, wherein the feeding speed is 5 g/min;
step three, plating a ceramic layer: driving a polyethylene film coil stock to feed, and cooling to plate gaseous aluminum oxide on the polyethylene film coil stock;
step four, rolling: and (4) measuring the thickness of the polyethylene film coil stock in the third step and rolling, wherein the rolling and unrolling speed is 50 m/min.
The resulting separator was tested for a thickness of 9.8 um.
Comparative example 1
The comparative example adopts the traditional gravure coating mode to coat the ceramic material on the polyethylene film substrate with the thickness of 9um, wherein, the thickness of the prepared ceramic coating is 2um, and the total thickness of the isolating film is 11 um.
Comparative example 2
Unlike comparative example 1, the ceramic coating prepared in this comparative example has a thickness of 4um, the total thickness of the barrier film is 13um, and the other structures are the same as in comparative example 1 and will not be described again.
The isolating films prepared in the examples 1-8 and the comparative examples 1-2 are applied to a 5Ah lithium ion battery for heat shrinkage, cycle performance, thermal shock and short circuit tests, and the test results are shown in Table 1, wherein the test operation of each item specifically comprises the following steps:
1) thermal shrinkage test: punching the isolating film into a sample with the size of 10cm by using a punching die, clamping the sample between folded A4 paper, baking the sample in a blast oven at the temperature of 150 ℃ for 0.5h, taking out the sample, measuring the size, and calculating the heat shrinkage rate according to the formula (L-10)/10 by 100%, wherein L is the transverse length or the longitudinal length of the sample after the baking is finished;
2) and (3) testing the cycle performance: carrying out charge-discharge cycle test on the battery at 0.7C multiplying power in a constant temperature box at 25 ℃/45 ℃;
3) and (3) thermal shock test: fully charging the battery cell, then placing the battery cell into an oven, heating the temperature of the oven to 130 ℃, 140 ℃ and 150 +/-2 ℃ at the speed of 5 +/-2 ℃/min, keeping the temperature for 60min, then stopping, and testing whether the battery cell is burnt or not (if the battery cell is burnt, the battery cell is not passed);
4) short circuit test: putting the fully charged core into an oven at 55 +/-5 ℃, and when the surface temperature of the battery cell reaches 55 +/-5 ℃, short-circuiting the anode and the cathode of the battery cell by using a load with a resistance of 50m omega, and monitoring whether the battery cell is ignited or not (if the battery cell is combusted, the battery cell does not pass);
TABLE 1 results of heat shrinkage, thermal shock, short circuit and cycle tests of examples and comparative examples
(Note: the test was conducted mainly on 10 cells in a set, wherein TD represents the heat shrinkage in the transverse direction, MD represents the heat shrinkage in the longitudinal direction, and 500cls represents that 500 cycles of the test were conducted)
The test results in table 1 show that compared with the conventional separator, the separator prepared by the method of the present invention has lower thermal shrinkage, better cyclicity, thermal shock resistance and short circuit prevention, which indicates that the separator obtained by the evaporation method of the present invention has higher safety performance, and the total thickness of the separator is also reduced, so that more space can be used inside the battery, and the energy density of the battery is increased.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The preparation method of the ceramic coating of the isolating membrane is characterized by comprising the following steps of:
step one, unreeling: mounting the isolating film substrate coil material in a vacuum evaporation machine and vacuumizing;
step two, heating: heating the ceramic plating material to a gas state and conveying the ceramic plating material to the vacuum evaporation machine in the first step;
step three, plating a ceramic layer: driving the isolating film substrate coil material in the first step to feed, and cooling to plate the gaseous ceramic plating material on the isolating film substrate coil material;
step four, rolling: and (5) measuring the thickness of the isolating film substrate roll in the third step and rolling.
2. The method for preparing a ceramic coating for an isolating membrane as claimed in claim 1, wherein: the material of the base material of the isolation film in the first step is any one of a polyethylene film, a polypropylene and polyethylene composite film, a polyester film, a cellulose film, a polyimide film, a polyamide film, a spandex film and an aramid film.
3. The method for preparing a ceramic coating for an isolating membrane as claimed in claim 1, wherein: the thickness of the isolating film substrate roll in the first step is 3-20 um.
4. The method for preparing a ceramic coating for an isolating membrane according to claim 3, wherein: the thickness of the isolating film substrate roll in the first step is 8-16 um.
5. The method for preparing a ceramic coating for an isolating membrane as claimed in claim 2, wherein: the first step also comprises the step of carrying out plasma pretreatment on the surface of the isolating film substrate roll.
6. The method for preparing a ceramic coating for an isolating membrane as claimed in claim 1, wherein: the vacuum degree range of the vacuum evaporation machine in the first step is 0.4-80 kpa.
7. The method for preparing a ceramic coating for an isolating membrane as claimed in claim 1, wherein: the ceramic plating material in the second step is any one of silicon, silicon oxide, silicon monoxide, aluminum oxide, titanium oxide, magnesium hydroxide and hydrated aluminum oxide.
8. The method for preparing a ceramic coating for an isolating membrane as claimed in claim 1, wherein: the heating temperature in the second step is 800-4000 ℃.
9. The method for preparing a ceramic coating for an isolating membrane as claimed in claim 1, wherein: and the feeding speed of the gaseous ceramic plating material in the second step is 0.05-5 g/min.
10. The method for preparing a ceramic coating for an isolating membrane as claimed in claim 1, wherein: the feeding and winding speeds of the diaphragm substrate coil stock are both 50-200 m/min.
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Application publication date: 20200110 |