CN109167004A - Coating fluid, lithium ion battery separator and lithium ion battery for lithium ion battery - Google Patents
Coating fluid, lithium ion battery separator and lithium ion battery for lithium ion battery Download PDFInfo
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- CN109167004A CN109167004A CN201811015292.0A CN201811015292A CN109167004A CN 109167004 A CN109167004 A CN 109167004A CN 201811015292 A CN201811015292 A CN 201811015292A CN 109167004 A CN109167004 A CN 109167004A
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- Prior art keywords
- ion battery
- lithium ion
- coating
- nano
- battery separator
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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
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- 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
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- 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
Abstract
The invention discloses a kind of coating fluid of lithium ion battery separator, lithium ion battery separator and lithium ion battery, the raw material of the coating fluid includes: nano wire, ceramic powder, adhesive and solvent；The nano wire is at least one of nano-cellulose, carbon nanotube, nano-silver thread, boron carbide nano wires, Kocide SD nano wire, aramid nano-fiber, silicon monoxide nano wire and hydroxyapatite nano line；The diameter of the nano wire is 1~100nm, and length is 0.1~100 μm；The ceramic powder is at least one of aluminium oxide, silica, titanium oxide, boehmite and concave convex rod.The present invention will be mixed to get the surface that coating fluid is coated on septum body using nano wire, ceramic powder and adhesive etc., and solidify, it obtains by septum body and the coat composed lithium ion battery separator being supported in the septum body, which has good thermal stability and puncture resistance etc..
Description
Technical field
The present invention relates to technical field of lithium ion, in particular to a kind of coating fluid for lithium ion battery,
Lithium ion battery separator and lithium ion battery.
Background technique
Lithium ion battery due to specific energy is big, operating voltage is high, service life cycle is long, memory-less effect, self discharge are small,
Pollution free green environment protection, the advantages that having extended cycle life, have been widely used in Portable mobile electronic device such as mobile phone, have taken the photograph
Camera, laptop etc. are also listed in the candidate power supply of electric car, space flight, military affairs and large-scale energy storage device.With lithium from
The development of sub- battery, requires the capacity, high and low temperature resistance and cycle life etc. of battery higher and higher, and lithium ion battery is one
Kind uses extensive secondary cell at present.
Lithium ion battery is mainly made of four big materials, including positive electrode, negative electrode material, diaphragm, electrolyte.As it
One of important component part, diaphragm play the role of its performance considerable.Diaphragm (battery separator) refers to
One layer of diaphragm material between the anode and cathode of battery, is usually referred to as with battery diaphragm.The main function of battery diaphragm is:
Isolation positive and negative electrode simultaneously prevent the electronics in battery from passing freely through, while allow the ion in electrolyte between positive and negative anodes from
By passing through.
The ionic conductivity of battery diaphragm is directly related to the overall performance of battery.Its effect that positive and negative anodes are isolated makes electricity
Pond can limit the rise of current in the case of overcharging or temperature rise, prevent battery short circuit from causing explosion, and have micro-
The self-closing protective effect in hole, plays the role of safeguard protection to battery user and equipment.
Since polyolefine material is cheap, and have preferable mechanical strength and chemical stability, comprehensive performance it is good, at
This it is cheap the advantages that and be widely used as micro-pore septum.But that there are thermal stability is poor due to it, puncture resistance difference and electricity
The insufficient problem of liquid wellability difference aspect is solved, therefore limits its further applying in the battery.
Summary of the invention
In view of this, a kind of coating fluid, lithium ion battery separator and lithium for lithium ion battery provided by the invention from
Sub- battery, preferably overcomes the above-mentioned problems of the prior art and defect, and the present invention will use nano wire, ceramic powder and glue
Glutinous agent etc. is mixed to get the surface that coating fluid is coated on septum body, and solidifies, obtain by septum body and be supported on it is described every
Coat composed lithium ion battery separator on membrane body, the lithium ion battery separator have good thermal stability, puncture resistant
Performance, electrolyte wellability and mechanical strength etc., efficiently solve existing diaphragm there are thermal stability poor, puncture resistance difference and
The problem of electrolyte wellability difference.
A kind of coating fluid for lithium ion battery separator, the raw material of the coating fluid include: nano wire, ceramic powder, glue
Glutinous agent and solvent；
The nano wire be nano-cellulose, carbon nanotube, nano-silver thread, boron carbide nano wires, Kocide SD nano wire,
At least one of aramid nano-fiber, silicon monoxide nano wire and hydroxyapatite nano line；The diameter of the nano wire is 1
~100nm, length are 0.1~100 μm；
The ceramic powder is at least one of aluminium oxide, silica, titanium oxide, boehmite and concave convex rod, the ceramics
The partial size of powder is 5~1000nm.
Further, the mass ratio of the ceramic powder and the nano wire is (0.1~5): 1；The quality of the nano wire
Account for the 1~30% of the quality of the solvent；The quality of the adhesive accounts for the 1~50% of the quality of the solvent.
Further, the raw material of the coating fluid further include: auxiliary agent；The quality of the auxiliary agent accounts for the quality of the solvent
0.01~3%
Further, the adhesive is polyvinyl alcohol, polyacrylonitrile, polyacrylic acid, butadiene-styrene rubber, carboxymethyl cellulose
At least one of element, Kynoar, polyvinylpyrrolidone and polyimides；The solvent include water, ethyl alcohol, acetone and
At least one of N-Methyl pyrrolidone.
Further, the auxiliary agent be fluoro-alkyl ethyoxyl alcohol ether, fatty alcohol polyoxyethylene ether, butylbenzene sodium naphthalene sulfonate,
At least one of ethylene hydroxy sulfuric acid sodium and lauryl sodium sulfate.
The present invention also provides a kind of lithium ion battery separators, including septum body and are supported in the septum body
Coating, the coating are obtained using above-mentioned coating fluid in an at least side surface for the septum body coating, solidification.
Further, the mode of the coating is dip-coating, spraying, spin coating or blade coating.
Further, the septum body is microporous polypropylene membrane, polyethene microporous membrane or polypropylene, polyethylene micropore
Film；3~20 μm of the thickness of the septum body.
Further, the coating with a thickness of 0.01~1 μm.
The present invention also provides a kind of lithium ion battery of profit, the lithium ion battery include above-mentioned lithium ion battery every
Film.
Compared with prior art, a kind of coating fluid, lithium ion battery separator and lithium for lithium ion battery of the invention
The beneficial effect of ion battery is:
The present invention will be mixed to get the table that coating fluid is coated on septum body using nano wire, ceramic powder and adhesive etc.
Face, and solidify, it obtains by septum body and the coat composed lithium ion battery separator being supported in the septum body, the lithium
Ion battery diaphragm has good thermal stability, puncture resistance, electrolyte wellability and mechanical strength etc., efficiently solves
Existing diaphragm has that thermal stability is poor, puncture resistance difference and electrolyte wellability difference；Further, the lithium-ion electric
The nano wire and ceramic powder that the coating material of pond diaphragm uses, can be to avoid coating is thicker and leads to the thickness and again of entire diaphragm
The problem of amount increases, so that it is good, thick to have reached lithium ion battery separator thermal stability, puncture resistance and electrolyte wellability
Degree and weight increase small effect.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, makees detailed
It is described as follows.
Specific embodiment
To facilitate the understanding of the present invention, it elaborates below with reference to the mode of embodiment to technical solution of the present invention,
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention.
But the invention can be embodied in many other ways as described herein, those skilled in the art can be with
Similar improvement is done without violating the connotation of the present invention, therefore the present invention is not limited to the specific embodiments disclosed below.
Unless otherwise defined, all technologies used herein and scientific term have and the common skill of fields of the present invention
The normally understood identical meaning of art personnel.When there is a conflict, the definition in this specification shall prevail.
Term as used herein:
" by ... preparation " it is synonymous with "comprising".Term "comprising" used herein, " comprising ", " having ", " containing "
Or its any other deformation, it is intended that cover non-exclusionism includes.For example, composition, step, method comprising listed elements,
Product or device are not necessarily limited to those elements, but may include not expressly listed other elements or such composition, step
Suddenly, method, product or the intrinsic element of device.
Conjunction " by ... form " exclude any element that do not point out, step or component.If in claim,
This phrase will make claim closed, so that it is not included the material in addition to the material of those descriptions, but relative
Except customary impurities.When phrase " by ... form " be rather than immediately following theme in the clause that appears in claim main body after
When, only it is limited to element described in the clause；Other elements be not excluded the claim as a whole it
Outside.
Equivalent, concentration or other values or parameter are excellent with range, preferred scope or a series of upper limit preferred values and lower limit
When the Range Representation that choosing value limits, this should be understood as specifically disclosing by any range limit or preferred value and any range
Any pairing of lower limit or preferred value is formed by all ranges, regardless of whether the range separately discloses.For example, when open
When range " 1~5 ", described range should be interpreted as including range " 1~4 ", " 1~3 ", " 1~2 ", " 1~2 and 4~
5 ", " 1~3 and 5 " etc..When numberical range is described herein, unless otherwise stated, otherwise the range is intended to include its end
Value and all integers and score in the range.
"and/or" is used to indicate that one of illustrated situation or both may to occur, for example, A and/or B includes (A
And B) and (A or B).
A kind of coating fluid for lithium ion battery separator, the raw material of the coating fluid include: nano wire, ceramic powder, glue
Glutinous agent and solvent.
It should be noted that the draw ratio (i.e. the ratio of length and diameter) of the nano wire need to be greater than 50, such as nanometer
The draw ratio of line can be 100,500,1000,8000 or 10000 etc.；The diameter of the nano wire be 1~100nm such as 1nm,
5nm, 10nm, 20nm, 30nm, 50nm, 80nm or 100nm etc.；The length of the nano wire is 0.1~100 μm such as 0.1 μm, 0.5
μm, 1 μm, 5 μm, 10 μm, 30 μm, 50 μm, 80 μm or 100 μm etc..
The nano wire be nano-cellulose, carbon nanotube, nano-silver thread, boron carbide nano wires, Kocide SD nano wire,
At least one of aramid nano-fiber, silicon monoxide nano wire and hydroxyapatite nano line.
The ceramic powder is at least one of aluminium oxide, silica, titanium oxide, boehmite and concave convex rod.The ceramics
The partial size of powder is 5~1000nm such as 5nm, 10nm, 50nm, 80nm, 100nm, 300nm, 500nm, 800nm or 1000nm etc..
Preferably, the mass ratio of the ceramic powder and the nano wire is (0.1~5): 1 such as 0.1:1,0.5:1,1:1,2:
1,3:1,4:1 or 5:1 etc.；The quality of the nano wire accounts for the 1~30% of the quality of the solvent such as 1%, 5%, 8%, 10%,
15%, 20%, 25% or 30% etc.；The quality of the adhesive accounts for the 1~50% of the quality of the solvent such as 1%, 5%,
10%, 20%, 30%, 40% or 50% etc..
Preferably, the raw material of the coating fluid further include: auxiliary agent；The quality of the auxiliary agent accounts for the quality of the solvent
0.01~3% such as 0.01%, 0.05%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5% or 3%.
It should be noted that being conducive to improve coating fluid in basement membrane such as polyene after auxiliary agent is added in the raw material of coating fluid
The surface tension of hydrocarbon micropore film surface.
Preferably, the adhesive be polyvinyl alcohol, polyacrylonitrile, polyacrylic acid, butadiene-styrene rubber, carboxymethyl cellulose,
At least one of Kynoar, polyvinylpyrrolidone and polyimides；The solvent includes water, ethyl alcohol, acetone and N-
At least one of methyl pyrrolidone.
Preferably, the auxiliary agent is fluoro-alkyl ethyoxyl alcohol ether, fatty alcohol polyoxyethylene ether, butylbenzene sodium naphthalene sulfonate, hydroxyl
At least one of sodium ethylsulfate and lauryl sodium sulfate.
The present invention also provides a kind of preparation method of coating fluid, the coating fluid is above-mentioned coating fluid, the preparation
Method includes: to be uniformly mixed each raw material.
Preferably, the preparation method includes: and first disperses long nano wire and short nano wire in a solvent, stirring or ultrasound
After mixing, adhesive is added, continues stirring or ultrasonic mixing uniformly obtains coating fluid.It further, can also be again
Auxiliary agent is continuously added after adhesive is added.
The present invention also provides a kind of lithium ion battery separators, including septum body and are supported in the septum body
Coating, the coating are obtained using above-mentioned coating fluid in an at least side surface for the septum body coating, solidification.
Preferably, dip-coating, spraying, spin coating, roller coating or blade coating etc. can be used in the mode of the coating.The cured mode
Using hardening with radiation or UV solidification or heat drying solidification in baking oven can be placed in.Preferably, the cured temperature is
40 DEG C~100 DEG C such as 40 DEG C, 50 DEG C, 60 DEG C, 70 DEG C, 80 DEG C, 90 DEG C or 100 DEG C, the cured time be 5~120s such as
5s, 10s, 30s, 50s, 80s, 100s or 120s etc..
It should be noted that coating fluid can be for by being coated on the single side surface of septum body (towards certain by above-mentioned coating
The one side of one electrode) or septum body double-sided surface (towards two lateral electrodes two sides), then solidification obtain；According to reality
Depending on needing.
Preferably, the septum body is microporous polypropylene membrane, polyethene microporous membrane or polypropylene, polyethylene microporous barrier.
It should be noted that above-mentioned microporous polypropylene membrane, polyethene microporous membrane or polypropylene, polyethylene microporous barrier are commercial product,
Such as it can be made by dry-stretch process.
Preferably, such as 3 μm, 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm or 20 of 3~20 μm of the thickness of the septum body
μm etc..
Preferably, the coating with a thickness of 0.01~1 μm as 0.01 μm, 0.05 μm, 0.08 μm, 0.1 μm, 0.3 μm,
0.5 μm, 0.8 μm or 1 μm etc..
It should be noted that the nano wire in coating fluid forms the main framing of coating, so that diaphragm has good machinery
Intensity, by composite ceramic, so that diaphragm further has good puncture resistance and electrolyte wetting property.
The present invention will be mixed to get the table that coating fluid is coated on septum body using nano wire, ceramic powder and adhesive etc.
Face, and solidify, it obtains by septum body and the coat composed lithium ion battery separator being supported in the septum body, the lithium
Ion battery diaphragm has good thermal stability, puncture resistance, electrolyte wellability and mechanical strength etc., efficiently solves
Existing diaphragm has that thermal stability is poor, puncture resistance difference and electrolyte wellability difference；Further, the lithium-ion electric
The nano wire and ceramic powder that the coating material of pond diaphragm uses, can be to avoid coating is thicker and leads to the thickness and again of entire diaphragm
The problem of amount increases, so that it is good, thick to have reached lithium ion battery separator thermal stability, puncture resistance and electrolyte wellability
Degree and weight increase small effect.
The present invention also provides a kind of lithium ion battery, the lithium ion battery includes above-mentioned lithium ion battery separator.
To facilitate the understanding of the present invention, below with reference to embodiment to further illustrate the technical scheme of the present invention.Applicant
Statement, the present invention illustrate detailed process equipment and process flow of the invention by following embodiments, but the present invention not office
It is limited to above-mentioned detailed process equipment and process flow, that is, does not mean that the present invention should rely on following detailed process equipments and technique stream
Cheng Caineng is implemented.It should be clear to those skilled in the art, any improvement in the present invention, to each original of product of the present invention
The equivalence replacement of material and addition, the selection of concrete mode of auxiliary element etc. all fall within protection scope of the present invention and open model
Within enclosing.
Embodiment 1
(1) 27 parts of ceramic powders and 30 parts of nano wires are taken to be scattered in 100 parts of ethyl alcohol, after being uniformly mixed, then to mixing
50 parts of butadiene-styrene rubber are added in liquid, continues to be uniformly mixed, obtains coating fluid；Wherein nano wire be diameter be 1~100nm and
The carbon nanotube that length is 0.1~100 μm, ceramic powder is the concave convex rod that partial size is 100nm.
(2) coating fluid of step (1) preparation is equably coated on to the side of polyethene microporous membrane by the way of spraying
Then surface solidifies 50s at a temperature of 70 DEG C；It is cooled to room temperature, obtains by polyethene microporous membrane and to be carried on polyethylene micro-
The coat composed lithium ion battery separator of hole film surface, wherein the thickness with a thickness of polyethene microporous membrane of polyethene microporous membrane
Degree be 20 μm, coating with a thickness of 0.05 μm.
Embodiment 2
(1) 7.5 parts of ceramic powders and 15 parts of nano wires are taken to be scattered in 100 parts of ethyl alcohol, after being uniformly mixed, then to mixing
25 parts of polyvinyl alcohol are added in liquid, continues to be uniformly mixed, obtains coating fluid；Wherein nano wire be diameter be 1~100nm and
The nano-cellulose that length is 0.1~100 μm, ceramic powder is the aluminium oxide that partial size is 500nm.
(2) coating fluid of step (1) preparation is equably coated on to the side of polyethene microporous membrane by the way of spraying
Then surface solidifies 120s at a temperature of 40 DEG C；It is cooled to room temperature, obtains by polyethene microporous membrane and to be carried on polyethylene micro-
The coat composed lithium ion battery separator of hole film surface；Wherein, the thickness with a thickness of polyethene microporous membrane of polyethene microporous membrane
Degree be 10 μm, coating with a thickness of 0.3 μm.
Embodiment 3
(1) 1 part of long nano wire and 10 parts of short nano wires is taken to be scattered in 200 parts of ethyl alcohol, after being uniformly mixed, then to mixed
It closes and 15 parts of polyvinyl alcohol is added in liquid, continue to be uniformly mixed, obtain coating fluid；Wherein nano wire be diameter be 1~
The hydroxyapatite nano line that 100nm and length are 0.1~100 μm, ceramic powder is the aluminium oxide that partial size is 1000nm.
(2) coating fluid of step (1) preparation is equably coated on to the side of polyethene microporous membrane by the way of spraying
Then surface solidifies 10s at a temperature of 90 DEG C；It is cooled to room temperature, obtains by polyethene microporous membrane and to be carried on polyethylene micro-
The coat composed lithium ion battery separator of hole film surface；Wherein, the thickness with a thickness of polyethene microporous membrane of polyethene microporous membrane
Degree be 5 μm, coating with a thickness of 1 μm.
Embodiment 4
(1) 2 parts of ceramic powders and 10 parts of nano wires are taken to be scattered in 100 parts of ethyl alcohol, after being uniformly mixed, then to mixed liquor
12 parts of polyvinyl alcohol of middle addition and 0.1 part of lauryl sodium sulfate, continue to be uniformly mixed, obtain coating fluid；Wherein
Nano wire is the carbon nanotube that diameter is 1~100nm and length is 0.1~100 μm, and ceramic powder is the bumps that partial size is 200nm
Stick.
(2) coating fluid of step (1) preparation is equably coated on to the side of polyethene microporous membrane by the way of spraying
Then surface solidifies 80s at a temperature of 60 DEG C；It is cooled to room temperature, obtains by polyethene microporous membrane and to be carried on polyethylene micro-
The coat composed lithium ion battery separator of hole film surface；Wherein, the thickness with a thickness of polyethene microporous membrane of polyethene microporous membrane
Degree be 8 μm, coating with a thickness of 0.5 μm.
Embodiment 5
(1) 6 parts of ceramic powders and 10 parts of nano wires are taken to be scattered in 50 parts of ethyl alcohol, after being uniformly mixed, then to mixed liquor
15 parts of polyvinyl alcohol of middle addition and 0.5 part of lauryl sodium sulfate, continue to be uniformly mixed, obtain coating fluid；Wherein
Nano wire is the carbon nanotube that diameter is 1~100nm and length is 0.1~100 μm, and ceramic powder is the bumps that partial size is 300nm
Stick.
(2) coating fluid of step (1) preparation is equably coated on to the side of polyethene microporous membrane by the way of spraying
Then surface solidifies 30s at a temperature of 80 DEG C；It is cooled to room temperature, obtains by polyethene microporous membrane and to be carried on polyethylene micro-
The coat composed lithium ion battery separator of hole film surface；Wherein, the thickness with a thickness of polyethene microporous membrane of polyethene microporous membrane
Degree be 12 μm, coating with a thickness of 0.1 μm.
Embodiment 6
(1) 8 parts of ceramic powders and 10 parts of nano wires are taken to be scattered in 40 parts of molten ethyl alcohol, after being uniformly mixed, then to mixing
16 parts of adhesives and 1.2 parts of lauryl sodium sulfate are added in liquid, continues to be uniformly mixed, obtains coating fluid；Wherein
Nano wire is the carbon nanotube that diameter is 1~100nm and length is 0.1~100 μm, and ceramic powder is the bumps that partial size is 600nm
Stick.
(2) coating fluid of step (1) preparation is equably coated on to the side of polyethene microporous membrane by the way of spraying
Then surface solidifies 100s at 50 °C；It is cooled to room temperature, obtains by polyethene microporous membrane and to be carried on polyethylene micro-
The coat composed lithium ion battery separator of hole film surface；Wherein, the thickness with a thickness of polyethene microporous membrane of polyethene microporous membrane
Degree be 18 μm, coating with a thickness of 0.05 μm.
Embodiment 7
The difference of the embodiment and embodiment 4 is: take 4 parts of ceramic powders and 10 parts of nano wires to be scattered in 100 parts of ethyl alcohol,
The other the same as in Example 4.
Embodiment 8
The difference of the embodiment and embodiment 4 is: take 6 parts of ceramic powders and 10 parts of nano wires to be scattered in 100 parts of ethyl alcohol,
The other the same as in Example 4.
Embodiment 9
The difference of the embodiment and embodiment 4 is: take 8 parts of ceramic powders and 10 parts of nano wires to be scattered in 100 parts of ethyl alcohol,
The other the same as in Example 4.
Embodiment 10
The difference of the embodiment and embodiment 4 is: take 3 parts of ceramic powders and 15 parts of nano wires to be scattered in 100 parts of ethyl alcohol,
The other the same as in Example 4.
Embodiment 11
The difference of the embodiment and embodiment 4 is: take 4 parts of ceramic powders and 20 parts of nano wires to be scattered in 100 parts of ethyl alcohol,
The other the same as in Example 4.
Embodiment 12
The difference of the embodiment and embodiment 4 is: take 6 parts of ceramic powders and 30 parts of nano wires to be scattered in 100 parts of ethyl alcohol,
The other the same as in Example 4.
To the thermal stability of the lithium ion battery separator of the preparation of above-described embodiment 1~12, punctured resistance and it is applied
The contact angle of layer surface is detected, and makes lithium ion using lithium ion battery separator prepared by above-described embodiment 1~12
Battery, and its electric property is detected, testing result is as shown in table 1 below.
Wherein, it diaphragm thermal stability: is measured according to GB/T 21650.1-2008 standard；
Punctured resistance: it is measured according to GB/T 36363-2018 standard.
Table 1
In table 1, battery main structure having the same in embodiment 1~12, comparative example 1~3, including anode, cathode,
Electrolyte and diaphragm, wherein the difference of lithium ion battery separator and embodiment 1~12 in comparative example 1~2 is coating
Thickness is thicker；The lithium ion battery separator of comparative example 3 is using polyethene microporous membrane, and the unsupported object for being used to form coating
Matter.It should be noted that above-mentioned polyethene microporous membrane is commercial product.
By the above table 1 it is found that due to being added to auxiliary agent in coating fluid prepared by embodiment 1~12, obtained lithium-ion electric
The contact angle of the coating surface of pond diaphragm is respectively less than the contact angle on the lithium ion battery separator surface of comparative example 3；Embodiment 4~12
Since the contact angle for being added to the coating surface for the lithium ion battery separator that auxiliary agent obtains is less than embodiment 1 in the coating fluid of preparation
The contact angle of the coating surface of the lithium ion battery separator of~3 preparations.It should be noted that painting prepared by embodiment 4~12
Auxiliary agent in cloth liquid replaces with fluoro-alkyl ethyoxyl alcohol ether, fatty alcohol polyoxyethylene ether, butylbenzene sodium naphthalene sulfonate and ethoxy sulphur
At least one of sour sodium can reach above-mentioned same effect.
To sum up, using lithium ion battery separator provided in an embodiment of the present invention, the thermal stability of lithium ion battery separator resists
The wellability of puncture resistance and electrolyte is improved significantly, and at the same time the battery for improving battery to a certain extent holds
The conservation rate of amount.
It should be added that the septum body in above-described embodiment 1~12 i.e. comparative example 1~3 is replaced with poly- third
Alkene microporous barrier or polypropylene, polyethylene microporous barrier can reach above-mentioned identical effect.
The above is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, inventive formulation and preparation process can have various modifications and variations.All within the spirits and principles of the present invention, institute
Any modification, equivalent substitution, improvement and etc. of work, should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of coating fluid for lithium ion battery separator, it is characterised in that: the raw material of the coating fluid include: nano wire,
Ceramic powder, adhesive and solvent；
The nano wire is nano-cellulose, carbon nanotube, nano-silver thread, boron carbide nano wires, Kocide SD nano wire, aramid fiber
At least one of nanofiber, silicon monoxide nano wire and hydroxyapatite nano line；The diameter of the nano wire be 1~
100nm, length are 0.1~100 μm；
The ceramic powder is at least one of aluminium oxide, silica, titanium oxide, boehmite and concave convex rod, the ceramic powder
Partial size is 5~1000nm.
2. the coating fluid according to claim 1 for lithium ion battery separator, it is characterised in that: the ceramic powder and institute
The mass ratio for stating nano wire is (0.1~5): 1；The quality of the nano wire accounts for the 1~30% of the quality of the solvent；The glue
The quality of glutinous agent accounts for the 1~50% of the quality of the solvent.
3. the coating fluid according to claim 1 for lithium ion battery separator, it is characterised in that: the original of the coating fluid
Material further include: auxiliary agent；The quality of the auxiliary agent accounts for the 0.01~3% of the quality of the solvent.
4. the coating fluid according to claim 1 for lithium ion battery separator, it is characterised in that: the adhesive is poly-
Vinyl alcohol, polyacrylonitrile, polyacrylic acid, butadiene-styrene rubber, carboxymethyl cellulose, Kynoar, polyvinylpyrrolidone and poly-
At least one of acid imide；The solvent includes at least one of water, ethyl alcohol, acetone and N-Methyl pyrrolidone.
5. the coating fluid according to claim 3 for lithium ion battery separator, it is characterised in that: the auxiliary agent is fluoro
In alkyl ethoxy alcohol ether, fatty alcohol polyoxyethylene ether, butylbenzene sodium naphthalene sulfonate, ethylene hydroxy sulfuric acid sodium and lauryl sodium sulfate
It is at least one.
6. a kind of lithium ion battery separator, it is characterised in that: including septum body and the coating that is supported in the septum body,
The coating is coated with, admittedly using the described in any item coating fluids of Claims 1 to 5 in an at least side surface for the septum body
Change obtains.
7. lithium ion battery separator according to claim 6, it is characterised in that: the mode of the coating be dip-coating, spraying,
Spin coating, roller coating or blade coating.
8. lithium ion battery separator according to claim 6, it is characterised in that: the septum body is polypropylene microporous
Film, polyethene microporous membrane or polypropylene, polyethylene microporous barrier；3~20 μm of the thickness of the septum body.
9. lithium ion battery separator according to claim 6, it is characterised in that: the coating with a thickness of 0.01~1 μm.
10. a kind of lithium ion battery, it is characterised in that: the lithium ion battery includes the described in any item lithiums of claim 6~9
Ion battery diaphragm.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811015292.0A CN109167004A (en) | 2018-08-31 | 2018-08-31 | Coating fluid, lithium ion battery separator and lithium ion battery for lithium ion battery |
| CN202111662828.XA CN114361715A (en) | 2018-08-31 | 2018-08-31 | Coating liquid for lithium ion battery, lithium ion battery diaphragm and lithium ion battery |
| EP19855799.3A EP3846245A4 (en) | 2018-08-28 | 2019-05-23 | Coating liquid for use in lithium ion battery, lithium ion battery separator, and lithium ion battery |
| PCT/CN2019/088088 WO2020042684A1 (en) | 2018-08-28 | 2019-05-23 | Coating liquid for use in lithium ion battery, lithium ion battery separator, and lithium ion battery |
| US17/255,809 US20210280947A1 (en) | 2018-08-28 | 2019-05-23 | Coating Liquid for Use in Lithium Ion Battery, Lithium Ion Battery Separator, and Lithium Ion Battery |
| JP2020567128A JP7202400B2 (en) | 2018-08-28 | 2019-05-23 | Lithium-ion battery coating liquid, lithium-ion battery separator and lithium-ion battery |
| KR1020207036390A KR102507794B1 (en) | 2018-08-28 | 2019-05-23 | Coating liquid used for lithium ion battery, lithium ion battery diaphragm and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811015292.0A CN109167004A (en) | 2018-08-31 | 2018-08-31 | Coating fluid, lithium ion battery separator and lithium ion battery for lithium ion battery |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111662828.XA Division CN114361715A (en) | 2018-08-31 | 2018-08-31 | Coating liquid for lithium ion battery, lithium ion battery diaphragm and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109167004A true CN109167004A (en) | 2019-01-08 |
Family
ID=64893659
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811015292.0A Withdrawn CN109167004A (en) | 2018-08-28 | 2018-08-31 | Coating fluid, lithium ion battery separator and lithium ion battery for lithium ion battery |
| CN202111662828.XA Pending CN114361715A (en) | 2018-08-31 | 2018-08-31 | Coating liquid for lithium ion battery, lithium ion battery diaphragm and lithium ion battery |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111662828.XA Pending CN114361715A (en) | 2018-08-31 | 2018-08-31 | Coating liquid for lithium ion battery, lithium ion battery diaphragm and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN109167004A (en) |
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