CN207818723U - A kind of isolation film and the lithium ion battery containing the isolation film - Google Patents
A kind of isolation film and the lithium ion battery containing the isolation film Download PDFInfo
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- CN207818723U CN207818723U CN201820012418.8U CN201820012418U CN207818723U CN 207818723 U CN207818723 U CN 207818723U CN 201820012418 U CN201820012418 U CN 201820012418U CN 207818723 U CN207818723 U CN 207818723U
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model belongs to technical field of lithium ion, more particularly to a kind of isolation film, including basement membrane and coated on the composite coating on the basement membrane at least a surface, the composite coating includes inorganic particle layer and the elastomer layer that is not swollen in electrolyte environment, the separate basement membrane of the inorganic particle layer is set as wavy on one side, and what the elastomer layer was connect with the inorganic particle layer is also configured as wavy on one side.Compared with the prior art, which has good thermal stability, and when winding will not collapse and the dilatancy for that can resist negative plate when battery.In addition the utility model also provides a kind of lithium ion battery containing above-mentioned isolation film, has higher thermal stability and mechanical performance, the dilatancy of negative plate can be resisted, to ensure safety and the planarization of battery.
Description
Technical field
The utility model belongs to technical field of lithium ion more particularly to a kind of isolation film and the lithium containing the isolation film
Ion battery.
Background technology
Lithium ion battery is since high with energy density, operating voltage is high, use temperature range is wide, service life is long, right
Advantages of environment protection is widely applied to mobile phone, tablet, laptop and various electric vehicles or even aviation boat
It, on wind and solar energy energy storage device.
The safety of lithium ion battery is always industry very concern.Wherein, isolation film is the peace for ensureing battery
The pith of full performance.The isolation film of industry universal is mainly the polyolefin films such as polyethylene, polypropylene at present；But general polyene
The fusing point of hydrocarbon isolation film is less than 200 DEG C, once there is short circuit thermal, polyolefine isolating film is easily heat-shrinked, to cause
Batteries caught fire or explosion.
To improve the thermal stability of diaphragm, at present in industry by membrane surface coat one layer be made of inorganic particulate it is more
Hole insulating layer reduces the thermal contraction performance of diaphragm, to avoid the problem that thermal runaway occurs for lithium ion battery.However as lithium
The continuous improvement of ion battery energy density, the expansion of the graphite cathode of high gram volume in charge and discharge process is very big, can lead
Send a telegraph the torsional deformation in pond.To solve the above-mentioned problems, researcher proposes to coat one layer of polymeric coating on diaphragm in the industry,
The polymer coating can stick together to inhibit the expansion of cathode with pole piece, keep the flatness of battery.But the polymerization
Polymer in object coating can be generally swollen in the electrolytic solution, once polymer is swollen, elasticity will be deteriorated, into
And so that polymer coating softening collapses, either collapsing for coating can be all caused when isolation film is wound or when cathode expands
It falls into, this all destroys the planarization of battery, and then can reduce the safety of battery.
In view of this, it is necessory to provide a kind of lithium ion battery isolation film to solve problems of the prior art.
Utility model content
One of the purpose of this utility model is：In view of the deficiencies of the prior art, a kind of isolation film is provided, the isolation film
With good thermal stability, when winding, will not collapse and the dilatancy for that can resist negative plate when battery, from
And ensure safety and the planarization of battery.
To achieve the goals above, the utility model uses following technical scheme：
A kind of isolation film, including basement membrane and coated on the composite coating on the basement membrane at least a surface, it is described compound
Coating includes inorganic particle layer and the elastomer layer that is not swollen in electrolyte environment, the separate base of the inorganic particle layer
Film is set as wavy on one side, and what the elastomer layer was connect with the inorganic particle layer is also configured as wavy on one side.
It should be noted that in inorganic particle layer, since there are gaps between inorganic particulate and inorganic particulate, thus
Leading to inorganic particle layer, there are ups and downs wavy；In addition, though the gap between inorganic particulate and inorganic particulate is not
Entire elastomer can be accommodated, but elastomer still has part that can be inserted into the gap, that is, it is to be located at two that elastomer, which has part,
Between a inorganic particulate, part be protrude from surface of inorganic particles, thus elastomer layer also form it is wavy.
Wherein, the inorganic particulate contained in inorganic particle layer is calcium oxide, zinc oxide, magnesia, titanium dioxide, titanium dioxide
Silicon, zirconium dioxide, stannic oxide, ceria, alundum (Al2O3), boehmite, silicon carbide, calcium carbonate, barium titanate, barium carbonate and
At least one of barium sulfate.
The elastomer contained in elastomer layer is at least one of polyethylene, polypropylene, makrolon and polystyrene.
The elasticity modulus of elastomer is 10~3000Mpa, it is preferable that the elasticity modulus of elastomer is 100~2000Mpa.Elasticity modulus
It is unsuitable too low, otherwise do not have the effect for improving composite coating elasticity；Elasticity modulus is also unsuitable excessively high, otherwise can influence diaphragm
The winding of winding or battery.
As a kind of improvement of isolation film described in the utility model, the coated area of the composite coating accounts for the total face of basement membrane
Long-pending 5%~50%.The hole plug for taking the mode that part coats that can reduce coating to isolation membrane body, to lithium ion battery
Performance is without influence.
As a kind of improvement of isolation film described in the utility model, the thickness of the composite coating is 0.2~8um.It is multiple
The thickness for closing coating is unsuitable excessively thin, does not otherwise have the effect for improving battery security and planarization；The thickness of composite coating is not
It is preferably blocked up, the integral thickness of battery otherwise can be influenced, the energy density of battery is reduced.
As a kind of improvement of isolation film described in the utility model, in the inorganic particle layer, the inorganic particulate
Average grain diameter be 0.08~3um, the particle size distribution of the inorganic particulate is 0.02~6um.The average grain of inorganic particulate
Diameter is unsuitable too small, and reunion is otherwise be easy to cause between inorganic particulate；The average grain diameter of inorganic particulate also should not be too large, otherwise can shadow
Ring coating effect.
As a kind of improvement of isolation film described in the utility model, the basement membrane is polyethylene micropore film, polypropylene
Microporous membrane, Kapton or non-woven fabrics.
Compared with the prior art, the isolation film of the utility model have it is following a little：
1) due to the stability of inorganic particulate this body structure in composite coating and its performance of heat resisting so that every
The inorganic particulate of film base material surface coating can inhibit the thermal contraction of barrier film base material, to improve the safety of battery.
2) due to composite coating elastomer layer have higher elasticity modulus, and elastomer in electrolyte environment not
Swelling occurs and does not collapse, can enduringly keep the concavo-convex characteristic on composite coating surface, therefore, not only in the mistake of isolation film winding
It is avoided that isolation membrane coat collapses influence isolation film quality in journey, and is carried for the expansion in pole piece charge and discharge and cyclic process
Space has been supplied, to inhibit the torsional deformation of battery, has ensured safety and the planarization of battery.
Another of the utility model is designed to provide a kind of lithium ion battery, including positive plate, negative plate, is interval in
Isolation film between positive plate and negative plate and electrolyte, the isolation film are the isolation film described in above-mentioned paragraph.
Compared with the prior art, the utility model lithium ion battery is formed as a result of inorganic particle layer and elastomer layer
Composite coating, therefore have higher thermal stability and mechanical performance, in addition, elastomer is insoluble in electrolyte environment
It is swollen, the dilatancy of negative plate can be resisted, to ensure safety and the planarization of battery.
Description of the drawings
Fig. 1 is the structural schematic diagram of isolation film in the utility model.
Fig. 2 is the distribution map of inorganic particulate and elastomer in the utility model.
Wherein：1- basement membranes, 2- composite coatings, 21- inorganic particle layers, 22- elastomer layers, 211- inorganic particulates, 221- bullets
Property body.
Specific implementation mode
As shown in Figure 1, a kind of isolation film, including basement membrane 1 and coated on the composite coating 2 on basement membrane 1 at least a surface,
Composite coating 2 includes inorganic particle layer 21 and elastomer layer 22, and the separate basement membrane 1 of inorganic particle layer 21 is set as wave on one side
Shape, what elastomer layer 22 was connect with inorganic particle layer 21 is also configured as wavy on one side.The coated area of composite coating 2 accounts for basement membrane
The 5%~50% of 1 gross area.The thickness of composite coating 2 is 0.2~8um.In elastomer layer 22, elastomer 221 is in electrolyte
It is not swollen in environment.The elasticity modulus of elastomer 221 is 10~3000Mpa, preferably 100~2000Mpa.In inorganic grain
In sublayer, the average grain diameter of inorganic particulate 21 is 0.08~3um, and the particle size distribution of inorganic particulate 21 is 0.02~6um.Separately
Outside, as shown in Fig. 2, being seen in microcosmic angle, elastomer is distributed between inorganic particulate and protrudes from surface of inorganic particles.
With reference to embodiment, the utility model is described in further detail, but the embodiment of the utility model
It is not limited to this.
Comparative example 1
The preparation of positive plate：
Cobalt acid lithium (positive active material), conductive agent superconduction carbon (Super-P), binder Kynoar (PVDF) are pressed
Mass ratio 96：2.0：2.0 be uniformly mixed anode sizing agent is made, slurry is coated in current collector aluminum foil, is then dried at 110 DEG C
Be cold-pressed after dry, slitting, cutting edge, tab welding, based lithium-ion battery positive plate is made.
The preparation of negative plate：
By graphite and conductive agent superconduction carbon (Super-P), thickener sodium carboxymethylcellulose (CMC), binder butylbenzene rubber
Glue (SBR) in mass ratio 96：1.5：1.0：1.5 are made negative electrode slurry, and slurry is coated on copper foil of affluxion body, then at 85 DEG C
Be cold-pressed after lower drying, slitting, cutting edge, tab welding, anode plate for lithium ionic cell is made.
The preparation of isolation film：Take the polyethylene film that thickness is 9 μm as basement membrane；
The preparation of electrolyte：By lithium hexafluoro phosphate (LiPF6) be dissolved in by mass ratio be 1：2：1 ethylene carbonate
(EC), the in the mixed solvent of dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) composition, obtains electrolyte.
The preparation of lithium ion battery：Above-mentioned positive plate, diaphragm and negative plate are wound into battery core, isolation film is located at adjacent
Between positive plate and negative plate, anode is drawn with aluminium pole ears spot welding, and cathode is drawn with nickel lug spot welding；Then battery core is placed in aluminium
It moulds in packaging bag, injects above-mentioned electrolyte, lithium ion battery is made in the processes such as encapsulated, chemical conversion, capacity.
Comparative example 2
The preparation of positive plate：
Cobalt acid lithium (positive active material), conductive agent superconduction carbon (Super-P), binder Kynoar (PVDF) are pressed
Mass ratio 96：2.0：2.0 be uniformly mixed anode sizing agent is made, slurry is coated in current collector aluminum foil, is then dried at 110 DEG C
Be cold-pressed after dry, slitting, cutting edge, tab welding, based lithium-ion battery positive plate is made.
The preparation of negative plate：
By graphite and conductive agent superconduction carbon (Super-P), thickener sodium carboxymethylcellulose (CMC), binder butylbenzene rubber
Glue (SBR) in mass ratio 96：1.5：1.0：1.5 are made negative electrode slurry, and slurry is coated on copper foil of affluxion body, then at 85 DEG C
Be cold-pressed after lower drying, slitting, cutting edge, tab welding, anode plate for lithium ionic cell is made.
The preparation of isolation film：
1) take the polyethylene film that thickness is 9 μm as basement membrane；
2) Kynoar-hexafluoropropene and sodium carboxymethylcellulose are add to deionized water, are stirred at 50 DEG C
2h, wherein the mass ratio of Kynoar-hexafluoropropene and sodium carboxymethylcellulose is 95:5, it is agglomerated into the suspension of bulky grain
Dispersion liquid；It is subsequently added into Al2O3Particle is stirred 1h, then adds polyacrylate dispersion (polyacrylate in aqueous solution
Content be 25wt%) continue stir 1h, wherein Al2O3Mass ratio with polyacrylate is 90:10, Al2O3With poly- inclined fluorine
The mass ratio of ethylene-hexafluoropropene is 50:50, the mixed slurry of inorganic particulate and adhesive polymer is obtained, the mixed slurry
Solid content is 42wt%；
3) mixed slurry obtained by step 2) on the two sides coated in basement membrane, is obtained by way of dipping coating after dry
Each surface composite coating thickness is 4 μm of isolation film.
The preparation of electrolyte：By lithium hexafluoro phosphate (LiPF6) be dissolved in by mass ratio be 1：2：1 ethylene carbonate
(EC), the in the mixed solvent of dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) composition, obtains electrolyte.
The preparation of lithium ion battery：Above-mentioned positive plate, diaphragm and negative plate are wound into battery core, isolation film is located at adjacent
Between positive plate and negative plate, anode is drawn with aluminium pole ears spot welding, and cathode is drawn with nickel lug spot welding；Then battery core is placed in aluminium
It moulds in packaging bag, injects above-mentioned electrolyte, lithium ion battery is made in the processes such as encapsulated, chemical conversion, capacity.
Embodiment 1
The preparation of positive plate：
Cobalt acid lithium (positive active material), conductive agent superconduction carbon (Super-P), binder Kynoar (PVDF) are pressed
Mass ratio 96：2.0：2.0 be uniformly mixed anode sizing agent is made, slurry is coated in current collector aluminum foil, is then dried at 110 DEG C
Be cold-pressed after dry, slitting, cutting edge, tab welding, based lithium-ion battery positive plate is made.
The preparation of negative plate：
By graphite and conductive agent superconduction carbon (Super-P), thickener sodium carboxymethylcellulose (CMC), binder butylbenzene rubber
Glue (SBR) in mass ratio 96：1.5：1.0：1.5 are made negative electrode slurry, and slurry is coated on copper foil of affluxion body, then at 85 DEG C
Be cold-pressed after lower drying, slitting, cutting edge, tab welding, anode plate for lithium ionic cell is made.
The preparation of isolation film：
1) take the polyethylene film that thickness is 9 μm as basement membrane；
2) by Al2O3Particle is dissolved in deionized water, is uniformly mixing to obtain Al2O3Slurry, and by Al2O3Slurry is by dipping
The mode of coating is coated on the two sides of basement membrane；
3) PP GRANULES is dissolved in solvent, stirs evenly and it is coated on step 2) by way of dipping coating
On gained so that PP GRANULES is distributed in Al2O3Between particle and protrude from Al2O3Particle surface obtains every one side after dry
Composite coating thickness is 4 μm of isolation film.
The preparation of electrolyte：By lithium hexafluoro phosphate (LiPF6) be dissolved in by mass ratio be 1：2：1 ethylene carbonate
(EC), the in the mixed solvent of dimethyl carbonate (DMC) and methyl ethyl carbonate (EMC) composition, obtains electrolyte.
The preparation of lithium ion battery：Above-mentioned positive plate, diaphragm and negative plate are wound into battery core, isolation film is located at adjacent
Between positive plate and negative plate, anode is drawn with aluminium pole ears spot welding, and cathode is drawn with nickel lug spot welding；Then battery core is placed in aluminium
It moulds in packaging bag, injects above-mentioned electrolyte, lithium ion battery is made in the processes such as encapsulated, chemical conversion, capacity.
Embodiment 2
The preparation of the present embodiment isolation film as different from Example 1：
1) take the polyethylene film that thickness is 9 μm as basement membrane；
2) by ZrO2Particle is dissolved in deionized water, is uniformly mixing to obtain ZrO2Slurry, and by ZrO2Slurry is applied by dipping
The mode of cloth is coated on the two sides of basement membrane；
3) polyethylene particle is dissolved in solvent, stirs evenly and it is coated on step 2) by way of dipping coating
On gained so that polyethylene particle is distributed in ZrO2Between particle and protrude from ZrO2It is multiple to obtain every one side for particle surface after dry
Close the isolation film that coating layer thickness is 4 μm.
Remaining is with embodiment 1, and which is not described herein again.
Embodiment 3
The preparation of the present embodiment isolation film as different from Example 1：
1) take the polyethylene film that thickness is 9 μm as basement membrane；
2) by TiO2Particle is dissolved in deionized water, is uniformly mixing to obtain TiO2Slurry, and by TiO2Slurry is applied by dipping
The mode of cloth is coated on the two sides of basement membrane；
3) polycarbonate pellets are dissolved in solvent, stir evenly and it is coated on step by way of dipping coating
2) on gained so that polycarbonate pellets are distributed in TiO2Between particle and protrude from TiO2Particle surface obtains each after dry
Surface composite coating thickness is 4 μm of isolation film.
Remaining is with embodiment 1, and which is not described herein again.
Embodiment 4
The preparation of the present embodiment isolation film as different from Example 1：
1) take the polyethylene film that thickness is 9 μm as basement membrane；
2) ZnO particle is dissolved in deionized water, is uniformly mixing to obtain ZnO slurries, and by ZnO slurries by dipping coating
Mode be coated in basement membrane two sides on；
3) granules of polystyrene is dissolved in solvent, stirs evenly and it is coated on step by way of dipping coating
2) on gained so that granules of polystyrene is distributed between ZnO particle and protrudes from ZnO particle surface, is obtained after dry each
Surface composite coating thickness is 4 μm of isolation film.
Remaining is with embodiment 1, and which is not described herein again.
Comparative example and embodiment explanation
Experimental example 1
Diaphragm in the above comparative example and embodiment is heat-shrinked
Thermal contraction test：Diaphragm is punched into the square sample of 100 × 100mm, indicates its longitudinal (MD) and lateral (TD),
And the length of initial MD and TD are measured, it then puts it into 130 DEG C of baking oven and toasts 2h, take out MD and TD after measuring baking
Length, calculate its percent thermal shrinkage.Wherein, percent thermal shrinkage=[ruler before (size after size-baking before baking)/baking
It is very little] × 100%.
Test result is shown in Table 1.
Table 1：The thermal contraction test result of the isolation film of comparative example and embodiment
Exist compared to traditional polyalkene diaphragm of comparative example 1, Examples 1 to 4 it can be seen from the test result of table 1
The composite coating that coating on base films is made of inorganic particulate and the elastomer not being swollen in electrolyte environment has more
Good high temperature resistance thermal contraction performance；And coating on base films is coated in comparative example 2 can send out by inorganic particulate and in the electrolytic solution
The composite coating that the polymer of raw swelling is formed, high temperature resistance thermal contraction performance are suitable with the utility model.It can be seen that nothing
Machine particle to improve isolation film thermal stability play the role of it is vital so that using the isolation of the utility model
The lithium ion battery of film has excellent security performance.
Experimental example 2
Lithium ion battery in above comparative example and embodiment is completely filled, visual examination deformation is passed through；Become
Shape ratio is shown in Table 2.
Table 2：Battery completely fills proportion of deformation
| Group | Cell deformation ratio |
| Comparative example 1 | 85% |
| Comparative example 2 | 24% |
| Embodiment 1 | 0% |
| Embodiment 2 | 0% |
| Embodiment 3 | 0% |
| Embodiment 4 | 0% |
Do not occur by inorganic particulate and in electrolyte environment from table 2 it can be seen that the basement membrane of Examples 1 to 4 is coated with
The composite coating of the elastomer composition of swelling, is not all deformed by its battery obtained；The basement membrane of comparative example 2 be coated with by
The composite coating that inorganic particulate and the polymer that can be swollen in the electrolytic solution are formed is occurred slight by its battery obtained
It deforms, isolation film does not coat any coating in comparative example 1, and serious deformation occurs by its battery obtained.
Experimental example 3
Discharge-rate test is carried out to the lithium ion battery in above comparative example and embodiment.
Discharge-rate is tested：First the multiplying power of 0.5C is used to charge at 25 DEG C lithium ion battery, 0.2C multiplying powers are put
Electricity records discharge capacity；Then 0.5C multiplying power chargings are carried out, 0.5C multiplying power dischargings record discharge capacity；Then 0.5C times is carried out
Rate charges, 1.0C multiplying power dischargings, records discharge capacity；0.5C multiplying power chargings, 2.0C multiplying power dischargings are finally carried out, record electric discharge is held
Amount.
Capacity retention ratio=(electric discharge appearance under discharge capacity/0.2C multiplying powers under each multiplying power under variant discharge-rate
Amount) × 100%.
Acquired results are shown in Table 3.
Table 3：The capacity retention ratio of comparative example and embodiment under different discharge-rates
| Group | 0.2C | 0.5C | 1.0C | 2.0C |
| Comparative example 1 | 100% | 96.8% | 93.0% | 80.8% |
| Comparative example 2 | 100% | 97.1% | 94.2% | 82.3% |
| Embodiment 1 | 100% | 97.3% | 94.8% | 85.0% |
| Embodiment 2 | 100% | 97.5% | 95.2% | 85.3% |
| Embodiment 3 | 100% | 97.6% | 95.6% | 85.7% |
| Embodiment 4 | 100% | 97.8% | 95.7% | 86.0% |
As shown in Table 3, in contrast, basement membrane is coated with by inorganic particulate and the bullet not being swollen in electrolyte environment
Property body composition composite coating Examples 1 to 4 battery high rate performance it is best, and basement membrane be coated with by inorganic particulate and
The battery high rate performance of the comparative example 2 for the composite coating that the polymer that can be swollen in electrolyte is formed takes second place, and isolation film
The battery high rate performance for being not coated by the comparative example 1 of any coating is worst.Thus, it could be seen that the utility model can not influence electricity
In the case of the high rate performance of pond, the deformation of battery is effectively improved.
Experimental example 4
Cycle performance test is carried out to the lithium ion battery in above comparative example and embodiment.
Cycle performance and thickness test：Lithium ion battery is charged at 25 DEG C using the multiplying power of 0.5C, the multiplying power of 0.5C is put
Electricity, carries out 500 cycles successively, the battery capacity under each loop test 0.5C multiplying powers, and at 25 DEG C of battery before cycle
Capacity is compared, and calculates the capacity retention ratio after cycle.
Capacity retention ratio=(capacity before capacity/cycle after 500 cycles under 0.5C multiplying powers at 25 DEG C of battery) ×
100%.
Thickness swelling=(thickness that battery completely fills before the thickness/cycle completely filled after 500 cycles) × 100%.
Acquired results are shown in Table 4.
Table 4：Comparative example and embodiment circulation volume conservation rate and thickness swelling
| Group | Capacity retention ratio | Thickness swelling |
| Comparative example 1 | 80.4% | 18.7% |
| Comparative example 2 | 83.6% | 7.5% |
| Embodiment 1 | 89.7% | 5.4% |
| Embodiment 2 | 89.9% | 5.8% |
| Embodiment 3 | 90.3% | 6.3% |
| Embodiment 4 | 91.5% | 6.0% |
As can be seen from Table 4, the cycle performance of lithium ion battery made from Examples 1 to 4 is substantially better than comparative example 1~2
The cycle performance of lithium ion battery obtained；In addition, the thickness swelling of lithium ion battery made from Examples 1 to 4 is compared to right
The thickness swelling of lithium ion battery made from ratio 1~2 also be improved significantly.It follows that the utility model can be not
In the case of influencing cycle performance of battery, the deformation of battery is effectively improved.
According to the disclosure and teachings of the above specification, the utility model those skilled in the art can also be to above-mentioned reality
The mode of applying is changed and is changed.Therefore, the utility model is not limited to above-mentioned specific implementation mode, every this field skill
It is new that art personnel any conspicuously improved, replacement or modification made on the basis of the utility model belongs to this practicality
The protection domain of type.In addition, although some specific terms, these terms has been used to be intended merely to facilitate in this specification
It is bright, any restrictions are not constituted to the utility model.
Claims (6)
1. a kind of isolation film, it is characterised in that：Including basement membrane and coated on the composite coating on the basement membrane at least a surface,
The composite coating includes inorganic particle layer and the elastomer layer that is not swollen in electrolyte environment, the inorganic particle layer
Separate basement membrane be set as wavy on one side, the elastomer layer is also configured as wave on one side with what the inorganic particle layer was connect
Wave-like.
2. isolation film according to claim 1, it is characterised in that：It is total that the coated area of the composite coating accounts for the basement membrane
The 5%~50% of area.
3. isolation film according to claim 1, it is characterised in that：The thickness of the composite coating is 0.2~8um.
4. isolation film according to claim 1, it is characterised in that：In the inorganic particle layer, the inorganic particulate
Average grain diameter is 0.08~3um, and the particle size distribution of the inorganic particulate is 0.02~6um.
5. isolation film according to claim 1, it is characterised in that：The basement membrane is polyethylene micropore film, polypropylene is micro-
Hole film, Kapton or non-woven fabrics.
6. a kind of lithium ion battery, including positive plate, negative plate, the isolation film being interval between positive plate and negative plate, and
Electrolyte, it is characterised in that：The isolation film is Claims 1 to 5 any one of them isolation film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820012418.8U CN207818723U (en) | 2018-01-04 | 2018-01-04 | A kind of isolation film and the lithium ion battery containing the isolation film |
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| CN201820012418.8U CN207818723U (en) | 2018-01-04 | 2018-01-04 | A kind of isolation film and the lithium ion battery containing the isolation film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111063852A (en) * | 2019-09-17 | 2020-04-24 | 宁德时代新能源科技股份有限公司 | Separator, method for producing same, lithium ion secondary battery, and device |
| CN114730963A (en) * | 2021-09-01 | 2022-07-08 | 宁德新能源科技有限公司 | Electrochemical device and electronic device including the same |
-
2018
- 2018-01-04 CN CN201820012418.8U patent/CN207818723U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111063852A (en) * | 2019-09-17 | 2020-04-24 | 宁德时代新能源科技股份有限公司 | Separator, method for producing same, lithium ion secondary battery, and device |
| CN114730963A (en) * | 2021-09-01 | 2022-07-08 | 宁德新能源科技有限公司 | Electrochemical device and electronic device including the same |
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