CN110391422A - A kind of lithium battery pole piece structure and its preparation process containing ceramic coating - Google Patents
A kind of lithium battery pole piece structure and its preparation process containing ceramic coating Download PDFInfo
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- CN110391422A CN110391422A CN201910477914.XA CN201910477914A CN110391422A CN 110391422 A CN110391422 A CN 110391422A CN 201910477914 A CN201910477914 A CN 201910477914A CN 110391422 A CN110391422 A CN 110391422A
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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
- 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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a kind of lithium battery pole piece structures containing ceramic coating, including pole piece ontology, the pole piece ontology includes the slurry diaphragm of collector and coating on a current collector, and micropore is uniformly provided on the slurry diaphragm, and the micropore runs through the both side surface of slurry diaphragm；A slurry diaphragm at least surface is coated with ceramic coating；And the preparation process of the pole piece is also disclosed, present invention cycle life with higher, security performance is also greatly improved, is had a vast market foreground.
Description
Technical field
The invention belongs to field of lithium, in particular to a kind of lithium battery pole piece structure and its preparation containing ceramic coating
Technique.
Background technique
With being widely used for lithium ion battery, the safety of lithium ion battery is that we need the problem of paying the utmost attention to, special
It is not the field that passenger car etc. is related to our securities of the lives and property, safety is even more the most important thing, in order to ensure lithium ion battery
Safety, to guarantee safety of lithium ion battery in the case where abuse, therefore people devise a variety of security tests
How to be designed by battery structure ensures that lithium ion battery can be by security test, to guarantee safety in use
Property is exactly our problems in need of consideration, and wherein thermal runaway is lithium ion battery safety problem the most serious, and thermal runaway is past
Toward along with the serious consequence such as on fire, dense smoke, the safety of life and property of lithium ion battery user is constituted very big
Threat, we are mainly based upon battery temperature for the detection of lithium ion battery thermal runaway, root it was found that thermal runaway rise
Because being typically all because mechanical abuse, electricity abuse etc. cause to generate amount of heat in the short time, by lithium ion battery thermal diffusion
The limitation of condition, heat are largely accumulated in inside lithium ion cell, cause positive and negative anodes active material to decompose, release active oxygen, into
One step leads to the oxygenolysis of electrolyte, generates more heats, finally causes the thermal runaway of lithium ion battery, therefore for
The control of lithium ion battery security is mainly based upon the monitoring to its temperature, carries out on the coating of diaphragm in the prior art
Research, has the effect of certain, but there are still certain problem, therefore, applicant proposes the application.
The oil system that the present invention mentions is binder not soluble in water, and water system is the binder for being dissolved in water.
Summary of the invention
To solve the above problems, the invention discloses a kind of lithium battery pole piece structure containing ceramic coating, packets
Include pole piece ontology, the pole piece ontology includes the slurry diaphragm of collector and coating on a current collector, on the slurry diaphragm
Even to offer micropore, the micropore runs through the both side surface of slurry diaphragm；A slurry diaphragm at least surface is coated with ceramics
Coating.
Preferably, the pole piece ontology is cathode pole piece, and the slurry diaphragm includes negative electrode active material, the first bonding
Agent, conductive agent and pole piece solvent.
Preferably, the pole piece ontology is anode pole piece, and the slurry diaphragm includes positive active material, the first bonding
Agent, conductive agent and pole piece solvent.
Preferably, the ceramic coating includes ceramic powder, dispersing agent, the second binder and solvent.
Preferably, the first bonding agents are polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropene, polytetrafluoroethylene (PTFE)
One or more kinds of mixtures；Second binder is sodium carboxymethylcellulose, butadiene-styrene rubber, one in water system glue
Kind or two or more mixtures.
Preferably, the micropore is 0.01-0.1mm.
Preferably, the conductive agent be one of electrically conductive graphite, acetylene black, carbon nanotube, nano powder, graphene or
The two or more mixture of person；The collector is one or more of copper foil, aluminium foil, foam copper, three-dimensional copper foil
Combine foil；The pole piece solvent and the solvent are deionized water, ethyl alcohol, N- methyl pyrrolidone, acetone or carbonic ester.
Preferably, ceramic powder in the ceramic coating: dispersing agent: the mass ratio of the second binder is 100:0.5-3:
2-5。
The quality of the preferably described solvent is the 100~2500% of the ceramic powder quality.
The invention also discloses the preparation processes of above-mentioned any lithium battery pole piece structure containing ceramic coating, include
Following steps:
S1: active material, first binder and conductive agent are added in pole piece solvent, are uniformly mixing to obtain mixture slurry
Material；
Mixture paste: being uniformly coated on the both side surface of collector by S2, and then drying, roll-in obtain slurry film
Piece；
S3: uniform shock goes out micropore on slurry diaphragm, obtains the battery pole piece with micropore；
S4: the preparation of ceramic coating slurry: dispersing agent and solvent are added in agitator, and it is uniformly saturating to stir formation in 2-3 hours
Bright polymer pulp, it is spare；Then ceramic powder, the second binder are added in polymer pulp, are stirred
It mixes 2-3 hours, makes ceramic powder is evengranular to be dispersed in polymer pulp, ceramic coating slurry is made；
S5: ceramic coating slurry: being coated in the surface of battery pole piece described in step S3 by the preparation of ceramic coating pole piece,
Coating thickness is 2-5 μm, 70-110 DEG C of drying.
Beneficial effects of the present invention: (1) by slurry diaphragm punching, the slurry film of obtained lithium battery pole on piece
Piece has several micropores, to increase the thermal interface of the active material in lithium ion battery, reduces interface resistance, improves and inhale
Efficiency and guarantor's liquid measure, improve the rate charge-discharge performance and cycle life of electrode, meet to power battery fast charging and discharging and make
With the requirement in service life.(2) electrodes of lithium-ion batteries with micropore of the invention, can compared with traditional non-porous negative electrode tab
More give full play to the performance of active material.In addition, battery pole piece of the present invention increases the thickness of pole piece by the way that ceramic coating is arranged
Degree improves the security performance of battery energy density and battery, changes simultaneously charge migration path between pole piece, improves production efficiency,
Reduce the manufacturing cost of battery.(3) present invention is coated with one layer of ceramic coating on slurry diaphragm, can effectively prevent lithium branch
Brilliant generation；(4) present invention is coated on water system cathode using oil system ceramic coating, and adhesive force is more excellent, and battery performance is more
It is good, longer life expectancy；If ceramic coating uses identical binder system (oil system or water system) with cathode, in coated ceramic coating
In the process, the moisture in ceramic coating can penetrate into cathode pole piece, make cathode that Swelling occur, and cathode and copper foil is caused to shell
From.If ceramic coating uses water-based binder, since ceramic material is the lesser ceramic powder particle of partial size, have very high
Specific surface area and porous structure, baking process be difficult completely to bake out moisture clean.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is that the performance number of battery made of embodiment 1-5 and comparative example 1-4 compares figure；
1- collector, 2- slurry diaphragm, 201- micropore, 3- ceramic coating.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.Below with reference to embodiment, the present invention will be further described, it should be understood that these embodiments are only used for illustration
Purpose, be in no way intended to limit protection scope of the present invention.
As shown in Figure 1, a kind of lithium battery pole piece structure containing ceramic coating, including pole piece ontology, the pole piece ontology packet
It includes collector 1 and coated in the slurry diaphragm 2 on collector 1, is uniformly provided with micropore 201 on the slurry diaphragm 2, it is described
Micropore 201 runs through the both side surface of slurry diaphragm 2；A slurry diaphragm 2 at least surface is coated with ceramic coating 3.
The pole piece ontology is cathode pole piece, and the slurry diaphragm 2 includes negative electrode active material, first bonding agents, conduction
Agent and pole piece solvent.
The pole piece ontology is anode pole piece, and the slurry diaphragm 2 includes positive active material, first bonding agents, conduction
Agent and pole piece solvent.
The ceramic coating 3 includes ceramic powder, dispersing agent, the second binder and solvent.
The first bonding agents be polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropene, polytetrafluoroethylene (PTFE) it is a kind of or
Two or more mixtures；Second binder is one of sodium carboxymethylcellulose, butadiene-styrene rubber, water system glue or two
Kind or more mixture.
The micropore is 0.01-0.1mm.
The conductive agent be one of electrically conductive graphite, acetylene black, carbon nanotube, nano powder, graphene or two kinds with
On mixture；The collector is the combined foils of one or more of copper foil, aluminium foil, foam copper, three-dimensional copper foil
Material, the pole piece solvent and the solvent are deionized water, ethyl alcohol, N-Methyl pyrrolidone, acetone or carbonic ester.
Ceramic powder in the ceramic coating 3: dispersing agent: the mass ratio of the second binder is 100:0.5-3:2-5.
The quality of the solvent is the 100~2500% of the ceramic powder quality.
A kind of preparation process of above-mentioned lithium battery pole piece structure containing ceramic coating comprising the steps of:
S1: active material, first binder and conductive agent are added in pole piece solvent, are uniformly mixing to obtain mixture slurry
Material；
Mixture paste: being uniformly coated on the both side surface of collector 1 by S2, and then drying, roll-in obtain slurry film
Piece 2；
S3: uniform shock goes out micropore 201 on slurry diaphragm 2, obtains the battery pole piece with micropore；
S4: the preparation of ceramic coating slurry: dispersing agent and solvent are added in agitator, and it is uniformly saturating to stir formation in 2-3 hours
Bright polymer pulp, it is spare；Then ceramic powder, the second binder are added in polymer pulp, are stirred
It mixes 2-3 hours, makes ceramic powder is evengranular to be dispersed in polymer pulp, ceramic coating slurry is made；
S5: ceramic coating slurry the preparation of ceramic coating pole piece: is coated in the surface of the battery pole piece, coating thickness
It is 2-5 μm, 70-110 DEG C of drying
Embodiment 1
It will calculate according to parts by weight and 75 parts of artificial graphites, 10 parts of electrically conductive graphites, 10 parts of water system glue (LA132) are added 100
It is stirred evenly in part deionized water, prepares uniform mixture paste, then uniform mixture paste is coated in copper foil table
Face.It is dried with oven, according to 1.4g/cm3Compacted density carry out roll-in, obtain cathode pole piece.Then cathode pole piece is rushed
Hole, uniform shock goes out the micropore 3 of circular 0.01mm on slurry diaphragm 2, obtains the negative pole piece of battery with micropore.
Then it calculates according to parts by weight and leads 80 parts of LiFePO 4s, 5 parts of acrylic acid, 5 parts of water system glue (LA132), 10 parts
Electro-graphitic is added in 100 parts of deionized waters and stirs evenly, and prepares uniform mixture paste, then uniform mixture is starched
Material is coated in aluminium foil surface.It is dried with oven, according to 2.3g/cm3Compacted density carry out roll-in, obtain anode pole piece.Then
Anode pole piece is passed through into punching, uniform shock goes out the micropore 3 of circular 0.01mm on slurry diaphragm 2, obtains with micropore
Battery positive pole piece.
The preparation of ceramic coating slurry: dispersing agent and water are added in agitator, stir 2 hours height for forming homogeneous transparent
Molecularly Imprinted Polymer slurry, it is spare；Then aluminium oxide, polytetrafluoroethylene (PTFE) are added in polymer pulp, are stirred 2 hours,
Make ceramic powder is evengranular to be dispersed in polymer pulp, ceramic coating slurry is made；The ceramic coating 3
Middle ceramic powder: dispersing agent: the mass ratio of the second binder (polytetrafluoroethylene (PTFE)) is 100:0.5:2；The quality of the solvent is
The 500% of the ceramic powder quality, dispersing agent use ammonium polyacrylate, and solvent uses acetone.
The preparation of ceramic coating pole piece: ceramic coating slurry is coated in the table of the battery cathode sheet or battery anode slice
Face, coating thickness are 2 μm, 70 DEG C of dryings.
Finally by the above-mentioned cathode pole piece with micropore and the anode pole piece with micropore by winding, baking, fluid injection,
The processes such as sealing, forming and capacity dividing prepare 18650 lithium ion batteries.
Embodiment 2
The present embodiment is the change made on the basis of embodiment 1, specifically described 3 0.05mm of micropore；Other are same
Embodiment 1.
Embodiment 3
The present embodiment is the change made on the basis of embodiment 1, specifically described 3 0.1mm of micropore；Other are same
Embodiment 1.
Embodiment 4
The present embodiment is the change made on the basis of embodiment 1, specifically step S5: the preparation of ceramic coating pole piece:
Ceramic coating slurry is coated in the surface of the battery cathode sheet or battery anode slice, coating thickness is 3 μm, 90 DEG C of dryings；
Other are the same as embodiment 1.
Embodiment 5
The present embodiment is the change made on the basis of embodiment 1, specifically step S5: the preparation of ceramic coating pole piece:
Ceramic coating slurry is coated in the surface of the battery cathode sheet or battery anode slice, coating thickness is 5 μm, and 110 DEG C dry
It is dry；Other are the same as embodiment 1.
Comparative example 1
It calculates according to parts by weight and 75 parts of artificial graphites, 10 parts of electrically conductive graphites, 10 parts of polyvinylidene fluoride is added 100 parts
It is stirred evenly in acetone, prepares uniform mixture paste, then uniform mixture paste is coated in copper foil surface.With
Oven drying, according to 1.4g/cm3Compacted density carry out roll-in, obtain cathode pole piece.Then it by cathode pole piece punching, is starching
Uniform shock goes out the micropore 3 of circular 0.01mm on material diaphragm 2, obtains the negative pole piece of battery with micropore.
Then it figures 80 parts of LiFePO 4s, 5 parts of acrylic acid, 5 parts of polyvinylidene fluoride, 1 part of conductive stone by weight
Ink is added in 100 parts of acetone and stirs evenly, and prepares uniform mixture paste, then uniform mixture paste is coated in
Aluminium foil surface.It is dried with oven, according to 2.3g/cm3Compacted density carry out roll-in, obtain anode pole piece.Then by positive pole
Piece passes through punching, and uniform shock goes out the micropore 3 of circular 0.01mm on slurry diaphragm 2, obtains the anode with micropore
Pole piece.
The preparation of ceramic coating slurry: dispersing agent and water are added in agitator, stir 2 hours height for forming homogeneous transparent
Molecularly Imprinted Polymer slurry, it is spare；Then aluminium oxide, sodium carboxymethylcellulose are added in polymer pulp, stirring 2
Hour, make ceramic powder is evengranular to be dispersed in polymer pulp, ceramic coating slurry is made；The ceramics
Ceramic powder in coating 3: dispersing agent: (mass ratio of sodium carboxymethylcellulose is 100:0.5:2 to the second binder；The solvent
Quality be the ceramic powder quality 500%, dispersing agent use ammonium polyacrylate, solvent use acetone.
S5: ceramic coating slurry the preparation of ceramic coating pole piece: is coated in the battery cathode sheet or battery anode slice
Surface, coating thickness are 2 μm, 70 DEG C of dryings.
Finally by the above-mentioned cathode pole piece with micropore and the anode pole piece with micropore by winding, baking, fluid injection,
The processes such as sealing, forming and capacity dividing prepare 18650 lithium ion batteries；(first binder is used using oil system, the second binder
Water system).
Comparative example 2
75 parts of artificial graphites will be calculated according to weight fraction, 10 parts of electrically conductive graphites, 10 parts of water system glue (LA132) be added go from
It is stirred evenly in sub- water, prepares uniform mixture paste, then uniform mixture paste is coated in copper foil surface.With
Oven drying, according to 1.4g/cm3Compacted density carry out roll-in, obtain cathode pole piece.Then it by cathode pole piece punching, is starching
Uniform shock goes out the micropore 3 of circular 0.01mm on material diaphragm 2, obtains the negative pole piece of battery with micropore.
Then it calculates according to parts by weight and leads 80 parts of LiFePO 4s, 5 parts of acrylic acid, 5 parts of water system glue (LA132), 10 parts
Electro-graphitic is added in deionized water and stirs evenly, and prepares uniform mixture paste, then uniform mixture paste is coated
In aluminium foil surface.It is dried with oven, according to 2.3g/cm3Compacted density carry out roll-in, obtain anode pole piece.It then will be positive
Pole piece passes through punching, and uniform shock goes out the micropore 3 of circular 0.01mm on slurry diaphragm 2, is obtaining the battery with micropore just
Pole pole piece.
The preparation of ceramic coating slurry: dispersing agent and water are added in agitator, stir 2 hours height for forming homogeneous transparent
Molecularly Imprinted Polymer slurry, it is spare；Then aluminium oxide, water system glue (LA132) are added in polymer pulp, stirring 2 is small
When, make ceramic powder is evengranular to be dispersed in polymer pulp, ceramic coating slurry is made, the ceramics apply
Ceramic powder in layer 3: dispersing agent: the mass ratio of the second binder (sodium carboxymethylcellulose) is 100:0.5:2；The solvent
Quality be the ceramic powder quality 500%；Dispersing agent uses ammonium polyacrylate, and solvent uses deionized water.
S5: ceramic coating slurry the preparation of ceramic coating pole piece: is coated in the battery cathode sheet or battery anode slice
Surface, coating thickness are 2 μm, 70 DEG C of dryings.
Finally by the above-mentioned cathode pole piece with micropore and the anode pole piece with micropore by winding, baking, fluid injection,
The processes such as sealing, forming and capacity dividing prepare 18650 lithium ion batteries；(first binder is used using water system, the second binder
Water system).
Comparative example 3
It is calculated according to parts by weight by 75 parts of artificial graphites, 10 parts of electrically conductive graphites, 10 parts of butadiene-styrene rubber adding into acetone stirrings
Uniformly, uniform mixture paste is prepared, then uniform mixture paste is coated in copper foil surface.It is dried, is pressed with oven
According to 1.4g/cm3Compacted density carry out roll-in, obtain cathode pole piece.Then by cathode pole piece punching, on slurry diaphragm 2
The even micropore 3 for impacting circular 0.01mm obtains the negative pole piece of battery with micropore.
Then it calculates according to parts by weight and leads 80 parts of LiFePO 4s, 5 parts of acrylic acid, 5 parts of polyvinylidene fluoride, 10 parts
Electro-graphitic adding into acetone stirs evenly, and prepares uniform mixture paste, then uniform mixture paste is coated in aluminium
Foil surface.It is dried with oven, according to 2.3g/cm3Compacted density carry out roll-in, obtain anode pole piece.Then by anode pole piece
By punching, uniform shock goes out the micropore 3 of circular 0.01mm on slurry diaphragm 2, obtains the cell positive pole with micropore
Piece.
The preparation of ceramic coating slurry: dispersing agent and water are added in agitator, stir 2 hours height for forming homogeneous transparent
Molecularly Imprinted Polymer slurry, it is spare；Then aluminium oxide, polyvinylidene fluoride are added in polymer pulp, stirring 2 is small
When, make ceramic powder is evengranular to be dispersed in polymer pulp, ceramic coating described in ceramic coating slurry is made
Ceramic powder in 3: dispersing agent: the mass ratio of the second binder (polyvinylidene fluoride) is 100:0.5:2；The matter of the solvent
Amount is the 500% of the ceramic powder quality；Dispersing agent uses ammonium polyacrylate, and solvent uses acetone.
S5: ceramic coating slurry the preparation of ceramic coating pole piece: is coated in the battery cathode sheet or battery anode slice
Surface, coating thickness are 2 μm, 70 DEG C of dryings.
Finally by the above-mentioned cathode pole piece with micropore and the anode pole piece with micropore by winding, baking, fluid injection,
The processes such as sealing, forming and capacity dividing prepare 18650 lithium ion batteries；(first binder is used using oil system, the second binder
Oil system).
Comparative example 4
It calculates according to parts by weight and 75 parts of artificial graphites, 10 parts of electrically conductive graphites, 10 parts of water system glue (LA132) is added 100 parts
It is stirred evenly in deionized water, prepares uniform mixture paste, then uniform mixture paste is coated in copper foil table
Face.It is dried with oven, according to 1.4g/cm3Compacted density carry out roll-in, obtain cathode pole piece.Then cathode pole piece is rushed
Hole, uniform shock goes out the micropore 3 of circular 0.01mm on slurry diaphragm 2, obtains the negative pole piece of battery with micropore.
Then it calculates according to parts by weight and leads 80 parts of LiFePO 4s, 5 parts of acrylic acid, 5 parts of polyvinylidene fluoride, 10 parts
Electro-graphitic is added in 100 parts of acetone and stirs evenly, and prepares uniform mixture paste, then uniform mixture paste is applied
Overlay on aluminium foil surface.It is dried with oven, according to 2.3g/cm3Compacted density carry out roll-in, obtain anode pole piece.
Finally by the above-mentioned cathode pole piece with micropore and the anode pole piece with micropore by winding, baking, fluid injection,
The processes such as sealing, forming and capacity dividing prepare 18650 lithium ion batteries；(no punching press micropore, no coating polymeric coating layer).
Correlated performance test is carried out to cathode pole piece made of embodiment 1-5 and comparative example 1 and 18650 batteries, is surveyed
Test result is shown in Table shown in 1, table 2.
The cathode pole piece of 1 embodiment 1 and comparative example 1-3 of table carries out moisture measurement
As it can be seen from table 1 cathode pole piece moisture content is most when comparative example 3 (ceramic coating coating oil system, oil system cathode)
It is less 805ppm, but the phenomenon that dropping off dew copper even occurs in partial region after coated ceramic coating；(water-thinned ceramic applies comparative example 1
Layer coating oil system cathode) when, cathode pole piece caking property is good, but moisture measurement content reaches 6941ppm；(the oil system of embodiment 1
Ceramic coating coats water system cathode) when, cathode pole piece bonding is good, moisture content 2368ppm；2 (water-thinned ceramic of comparative example
Coating coats water system cathode) after, cathode pole piece not only drops off seriously, but also moisture content reaches 7354ppm.
It can thus be seen that entire electrode easily drops off, and glues when coating and electrode use identical caking agent series
Connecing property is poor；And when coating and electrode use different bonding agent system, cover better performances, analyze reason are as follows: ceramic coating with
When cathode uses identical binder system, in coated ceramic coating procedure, the moisture in ceramic coating can penetrate into cathode pole piece
In, make cathode that Swelling occur, cathode and copper foil is caused to remove；When ceramic coating uses water-based binder, due to ceramic material
Material is partial size smaller particle, has very high specific surface area, and baking process is difficult completely to bake out moisture clean.Battery production
In, pole piece quality and moisture control are to influence two key factors of battery performance.
The performance test results of the table 2 to battery made of embodiment 1-5 and comparative example 1-4
Can be seen that from table 2 and Fig. 2 in low circulation number, embodiment 1-5, comparative example 1-4 capacity retention ratio compared with
Height, and embodiment 1-5 still has 99% capacity retention ratio after circulation 300 times, is above comparative example 1-4；Work as cycle-index
When up to 500 times, comparative example 1-4, especially comparative example 4, capacity retention ratio decline is more, down to 75%, but embodiment 1-5
Still there is 97% capacity retention ratio；When cycle-index is up to 1000 times, the capacity retention ratio of comparative example 4 is implemented down to 50%
Example 1-5 capacity retention ratio is up to 94%, illustrates, battery pole piece of the invention substantially increases battery after being applied to battery
Cycle performance.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.Several implementations of the invention above described embodiment only expresses
Mode, the description thereof is more specific and detailed, and but it cannot be understood as the limitations to patent of invention range.It should be understood that
, for those of ordinary skill in the art, without departing from the inventive concept of the premise, can also make several
Modification and improvement, these are all within the scope of protection of the present invention.Therefore, the scope of protection of the patent of the present invention should be with appended right
Subject to it is required that.
Claims (10)
1. a kind of lithium battery pole piece structure containing ceramic coating, including pole piece ontology, it is characterised in that: the pole piece ontology includes
Collector (1) and the slurry diaphragm (2) being coated on collector (1), are uniformly provided with micropore on the slurry diaphragm (2)
(201), the micropore (201) runs through the both side surface of slurry diaphragm (2)；Slurry diaphragm (2) at least surface is coated with
Ceramic coating (3).
2. a kind of lithium battery pole piece structure containing ceramic coating according to claim 1, it is characterised in that: the pole piece sheet
Body is cathode pole piece, and the slurry diaphragm (2) includes negative electrode active material, first bonding agents, conductive agent and pole piece solvent.
3. a kind of lithium battery pole piece structure containing ceramic coating according to claim 1, it is characterised in that: the pole piece sheet
Body is anode pole piece, and the slurry diaphragm (2) includes positive active material, first bonding agents and conductive agent and pole piece solvent.
4. a kind of lithium battery pole piece structure containing ceramic coating according to claim 2 or 3, it is characterised in that: the pottery
Porcelain coating (3) includes ceramic powder, dispersing agent, the second binder and solvent.
5. a kind of lithium battery pole piece structure containing ceramic coating according to claim 4, it is characterised in that: described first is viscous
Connect agent be polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropene, polytetrafluoroethylene (PTFE) one or more mixture；Institute
State the mixture that the second binder is one or more of sodium carboxymethylcellulose, butadiene-styrene rubber, water system glue；
The pole piece solvent and the solvent are deionized water, ethyl alcohol, N-Methyl pyrrolidone, acetone or carbonic ester.
6. a kind of lithium battery pole piece structure containing ceramic coating according to claim 4, it is characterised in that: the micropore is straight
Diameter is 0.01-0.1mm.
7. a kind of lithium battery pole piece structure containing ceramic coating according to claim 2 or 3, it is characterised in that: described to lead
Electric agent is one of electrically conductive graphite, acetylene black, carbon nanotube, nano powder, graphene or two or more mixtures；It is described
Collector is the combination foil of one or more of copper foil, aluminium foil, foam copper, three-dimensional copper foil.
8. a kind of lithium battery pole piece structure containing ceramic coating according to claim 4, it is characterised in that: the ceramics apply
Ceramic powder in layer (3): dispersing agent: the mass ratio of the second binder is 100:0.5-3:2-5.
9. a kind of lithium battery pole piece structure containing ceramic coating according to claim 4, it is characterised in that: the solvent
Quality is the 100~2500% of the ceramic powder quality.
10. a kind of comprising the lithium battery pole piece structure containing ceramic coating described in any one of claim 1-3,5,6,8,9
Preparation process, it is characterised in that: comprise the steps of:
S1: active material, first binder and conductive agent are added in pole piece solvent, mixture paste is uniformly mixing to obtain；
Mixture paste: being uniformly coated on the both side surface of collector (1) by S2, and then drying, roll-in obtain slurry diaphragm
(2)；
S3: uniform shock goes out micropore (201) on slurry diaphragm (2), obtains the battery pole piece with micropore；
S4: the preparation of ceramic coating slurry: dispersing agent and solvent are added in agitator, are stirred 2-3 hours and are formed homogeneous transparent
Polymer pulp, it is spare；Then ceramic powder, the second binder are added in polymer pulp, stir 2-3
Hour, make ceramic powder is evengranular to be dispersed in polymer pulp, ceramic coating slurry is made；
S5: ceramic coating slurry: being coated in the surface of battery pole piece described in step S3 by the preparation of ceramic coating pole piece, and coating is thick
Degree is 2-5 μm, 70-110 DEG C of drying.
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