CN110148708A - A kind of negative electrode tab and lithium ion battery - Google Patents

A kind of negative electrode tab and lithium ion battery Download PDF

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Publication number
CN110148708A
CN110148708A CN201910464690.9A CN201910464690A CN110148708A CN 110148708 A CN110148708 A CN 110148708A CN 201910464690 A CN201910464690 A CN 201910464690A CN 110148708 A CN110148708 A CN 110148708A
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negative electrode
electrode tab
coating
layer
silicon
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CN110148708B (en
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彭冲
陈秀梅
李俊义
徐延铭
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Zhuhai Cosmx Battery Co Ltd
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Zhuhai Cosmx Battery Co Ltd
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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
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • 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
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • 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
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • 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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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

A kind of negative electrode tab and lithium ion battery, belong to technical field of lithium ion.The negative electrode tab includes negative current collector and the film layer that is coated on the negative current collector；Film layer is divided into two layers, and first layer film layer is the bottom equadag coating close to negative current collector；Second layer film layer is that the top layer far from copper foil contains silicon coating；Using double-coated technology, 2 kinds of slurries are applied on negative current collector simultaneously, after the ipsilateral formation double-coating cream structure of negative current collector, siliceous coating is made in top layer, double-deck coating negative electrode tab of the not siliceous pure graphite linings in bottom, negative electrode tab obtained is with high-pressure solid and high capacity performance, and preparation method simple process, lithium ion battery obtained has the advantages of high energy density and good cycle, lithium can be analysed to avoid the surface of cathode pole piece under larger multiplying power quick charge simultaneously, meet industrial application demand.

Description

A kind of negative electrode tab and lithium ion battery
Technical field
The invention belongs to technical field of lithium ion, and in particular to a kind of negative electrode tab and lithium ion battery.
Background technique
In recent years, as lithium ion battery industry scale is constantly expanded and the continuous development of the relevant technologies, lithium-ion electric Pond has become the energy storage device of mainstream electronic product, and the purposes of lithium ion battery has obtained great extension.At the same time, people The performance requirement of lithium ion battery is also further increased, it is desirable that also want simultaneous while lithium ion battery has high-energy density Has long circulation life.
Method one for promoting energy density for cathode at present takes the technologies such as size particles collocation to improve cathode Compacting, it is low but high-pressure solid will lead to pole piece porosity is low, battery protects liquid measure, and then the circulating battery later period is caused to be dived problem； The other is promoting the gram volume of cathode, since the theoretical capacity of silicon is up to 4200mAh/g, while reserves are rich in nature Richness, and become one of the material of substitution graphite cathode material great potential.However, silicon based anode material lithium ion insertion with There are huge volume change during deintercalation, electrode material probably causes electrode because bulk effect generates internal stress Material fragmentation, thus the problem of losing the electrical contact with collector and leading to poor circulation.
Summary of the invention
The problem of the purpose of the present invention is to solve poor circulations caused by silicon-based anode bulk effect, provides one kind Negative electrode tab and lithium ion battery, the negative electrode tab is with high-pressure solid and high capacity performance, and preparation process is easy, lithium obtained from Sub- battery has the advantages of high energy density and good cycle, while can be to avoid cathode pole piece under big multiplying power quick charge Surface analyse lithium, meet industrial application demand.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of negative electrode tab, including negative current collector and coated on the film layer on the collector, the film layer is divided into two layers, and first Tunic layer is the bottom equadag coating close to collector；Second layer film layer is that the top layer far from collector contains silicon coating；Wherein, it pushes up Layer is 5wt.% ~ 30wt.% containing silicon materials ratio in silicon coating；Silicon materials account for negative electrode tab gross activity substance weight in negative electrode tab 5%~20%；Coating drying after, bottom equadag coating with a thickness of 44 ~ 85um, top layer is containing silicon coating with a thickness of 20 ~ 48um.
Further, using bimodulus coating head extrusion coater, 2 kinds of slurries are applied on negative current collector simultaneously, After the ipsilateral formation double-coating cream structure of negative current collector, siliceous coating is made in top layer, not siliceous pure graphite linings are the bottom of at The double-deck coating negative electrode tab of layer；After being painted with the one side of collector, repeats and be coated with another side in the manner described above.
A kind of lithium ion battery containing above-mentioned negative electrode tab, the lithium ion battery include positive plate, negative electrode tab, diaphragm And electrolyte.
The present invention having the beneficial effect that compared with the existing technology
(1) containing the silicon materials in silicon coating, the biggish volume in process of intercalation is swollen using top layer for negative electrode tab prepared by the present invention It is swollen, improve the porosity of cathode pole piece, it can be ensured that pole piece also guarantor's liquid measure with higher in the state of higher pressure reality, it can Obtain better ionic conductivity；Since the silicon materials of addition become privileged processing and the optimization of blending amount by surface, bottom is applied Layer and top layer are used containing silicon coating coating roll-in simultaneously simultaneously than the separated painting interlayer fourth of the twelve Earthly Branches cooperation for being coated with the double-deck pole piece separately dried It by force, is not in apply interlayer segregation phenomenon, therefore can guarantee the electron conduction of pole piece material entirety.Negative electrode tab obtained Reversible specific capacity is 380 ~ 596mAh/g for the first time, and negative electrode tab of the present invention has both high-pressure solid and high capacity performance, improves The energy density of cathode.
(2) lithium ion battery of the invention has better energy density and cycle performance, is able to satisfy industrial application and wants It asks.
It (3), can be to avoid cathode pole under big multiplying power quick charge after negative electrode tab of the present invention is used for lithium ion battery Lithium is analysed on the surface of piece, and security application is more preferable.
Specific embodiment
In order to which above and other objects of the present invention, feature and advantage can be become apparent from, spy lifts the embodiment of the present invention and does in detail It describes in detail bright, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this Embodiment in invention, the every other implementation that those of ordinary skill in the art obtain without making creative work Example, shall fall within the protection scope of the present invention.Reagent, material and the instrument arrived used in following the description is said as not special It is bright, it is conventional reagent, conventional material and conventional instrument, commercially available, related reagent can also pass through conventional conjunction It synthesizes and obtains at method.
Specific embodiment 1: what present embodiment recorded is a kind of negative electrode tab, including negative current collector and it is coated on institute The film layer on collector is stated, the film layer is divided into two layers, and first layer film layer is the bottom equadag coating close to collector, the painting Coating expansion is small after layer has compacting greatly and charges, liquid storage capacity difference performance；Second layer film layer is that the top layer far from collector contains Silicon coating, coating expansion is big after the coating has gram volume height and charges, liquid storage capacity epistasis energy；Wherein, the siliceous painting of top layer Silicon materials ratio is 5wt.% ~ 30wt.% in layer；Silicon materials account for the 5% ~ 20% of negative electrode tab gross activity substance weight in negative electrode tab； Coating drying after, bottom equadag coating with a thickness of 44 ~ 85um, top layer is containing silicon coating with a thickness of 20 ~ 48um.
Specific embodiment 2: a kind of negative electrode tab described in specific embodiment one, is coated with using bimodulus coating head squash type 2 kinds of slurries are applied on negative current collector simultaneously, after the ipsilateral formation double-coating cream structure of negative current collector, are made by machine Siliceous coating is in top layer, double-deck coating negative electrode tab of the not siliceous pure graphite linings in bottom；After being painted with the one side of collector, then Another side is coated with by repetition in the manner described above.
Specific embodiment 3: a kind of negative electrode tab described in specific embodiment one, the negative current collector is homogeneous copper Foil, porous copper foil and with applying one of layer of charcoal copper foil.
Specific embodiment 4: a kind of negative electrode tab described in specific embodiment one, two layers of film layer is living containing cathode Property substance, conductive agent, binder and thickener composite material；It then include the dry powder weight of substance if bottom equadag coating Ratio is negative electrode active material: conductive agent: binder: thickener=95 ~ 98 %:0 ~ 2 %:1 ~ 1.5%:1 ~ 1.5%, negative electrode active Substance is graphite；Contain silicon coating if top layer, then the ratio comprising substance is negative electrode active material: conductive agent: binder: thickening Agent=92.5 ~ 97 %: 1 ~ 3 %: 1.5 ~ 3%: 0.5% ~ 1.5%, negative electrode active material are graphite and silicon materials.The cathode The graphite of active material bottom and top layer is the high-pressure solid graphite containing second particle, compacted density 1.78g/cm2.It is secondary Particle, which refers to, uses small grain size natural graphite, petroleum coke, needle coke, pitch coke etc. for substrate, by addition covering material and adds Add agent, it, can be by the substrate of small grain size by controlling material proportion, heating curve and mixing speed under the conditions of high-temperature stirring Secondary granulation, obtained particle is second particle.The product of secondary granulation can effectively improve material compared with the product of one-size Water retainability and the expansion rate (there are shrinkage pools between little particle and little particle) for reducing material, shorten the diffusion path (lithium of lithium ion Ion abjection/insertion path from little particle is shorter), it is allowed to smoothly to make lithium ion from negative electrode material under high voltages Abjection/insertion, while the cryogenic property and cycle life of material can be improved.Graphite is the preparation of material producer, contains secondary Grain and small individual particle.
Specific embodiment 5: a kind of negative electrode tab described in specific embodiment four, the silicon materials are that spy is contained on surface The composite material and SiO of the silicon alloy of different conductive polymer polymer, silicon and carbonxOne of or several mixtures, In 0.5 > x > 2, the conductive polymer polymer be one of polyaniline, polythiophene, polypyrrole or several mixtures.
Specific embodiment 6: a kind of negative electrode tab described in specific embodiment four, the conductive agent is conductive black Super P, gas phase generate one of carbon fiber VGCF, graphene or carbon nanotube CNTs or several mixtures.
Specific embodiment 7: a kind of negative electrode tab described in specific embodiment four, the binder is aqueous binders, The aqueous binders are styrene butadiene rubber sbr, nitrile rubber, butadiene rubber, modified styrene butadiene rubber, Sodium Polyacrylate PAA- One of Na, aqueous polyacrylamide lonitrile copolymer and polyacrylate or several mixtures；The thickener is with thickening The sodium carboxymethylcellulose CMC and/or organic silicon modified by polyether polymer of effect.
Specific embodiment 8: a kind of contain negative electrode tab described in any specific embodiment of specific embodiment one to seven Lithium ion battery, the lithium ion battery includes positive plate, negative electrode tab, diaphragm and electrolyte.
Embodiment 1
(1) preparation of positive plate:
By positive electrode active materials LiCoO2, binder PVDF, conductive black (Super P) be dissolved according to mass ratio 97:1.5:1.5 It is stirred evenly in N-Methyl pyrrolidone (NMP) and slurry is made, be uniformly coated on plus plate current-collecting body aluminium foil, dried, after roll-in The positive plate of lithium ion battery is made；Wherein positive electrode active materials may be NCM ternary material (532/622/811 etc.) or phosphorus The positive electrode that sour iron lithium material etc. is sold on the market；The drying and roll-in are this field conventional steps.Anode sizing agent it is dense Degree and coating thickness use the existing conventional parameter in this field.
(2) preparation of conducting polymer cladding silicon materials:
It is ultrasonic 10min in 2000mL 0.15g/L sodium dodecyl sulfate solution that 10g silicon materials, which are dispersed to concentration,；Then 100mmol aniline monomer is instilled, then 22.82g ammonium persulfate will be added and instilled as initiator, stirs 3 in ice water mixing bath Hour, it is washed with deionization and ethyl alcohol, products therefrom is placed in a vacuum drying oven, and is dried in vacuo 24 under the conditions of 60 DEG C H is to get the silicon materials coated to conductive polymer polymer polyanaline；The silicon materials can be silicon alloy, silicon/carbon composite wood One of material and SiOx or several mixtures, wherein 0.5 > x > 2.The conducting polymer may be used also in addition to polyaniline Think one of polythiophene, polypyrrole etc. or several mixtures.
(3) preparation of the double-deck film layer negative electrode tab:
(a) bottom coating sizing-agent is prepared
Negative electrode active material 1, conductive agent, thickener, binder are configured to negative electrode slurry by the mass ratio of 97:0.5:1.5:1, The ratio is siccative mass ratio, and the conductive agent of the present embodiment is conductive black (Super P), and thickener is sodium carboxymethylcellulose (CMC), binder is emulsion type butadiene-styrene rubber (SBR), and negative electrode active material 1 is artificial graphite, selects second particle and single The composite particles graphite of grain collocation is as negative electrode active material, and wherein the weight fraction ratio of individual particle is in this composite particles graphite 20%, the average grain diameter D50 of individual particle are 7 ~ 10um, and second particle average grain diameter D50 is 14 ~ 17um, and composite particles graphite is put down Equal partial size D50 is 13 ~ 16um；The compacting of composite particles graphite is 1.78g/cm2；
Deionized water is added into double planetary mixer, conductive agent is added in whipping process, disperses 20min, 0.4% carboxylic is first added Sodium carboxymethylcellulose pyce stirs 30min；After mixing, 1 artificial graphite of active material is added, it is thick to stir 2 hours, complete conductive charcoal Black and 1 artificial graphite of active material dispersion process, adds remaining sodium carboxymethylcellulose, stirs 1 hour, and adjustment is viscous Degree adds SBR emulsion stirring 30min, finally vacuumizes removing bubble, filtered with 150 mesh stainless steel mesh, obtain and contain admittedly 43% bottom coating sizing-agent.
(b) top layer coating sizing-agent is prepared
Negative electrode active material 2, conductive agent, thickener, binder are configured to negative electrode slurry by the mass ratio of 95:2:2.2:0.8, The ratio is siccative mass ratio, and the negative electrode active material 2 of the present embodiment is the mixture of artificial graphite and silicon materials, quality hundred Point than be 90%:10%, conductive agent be conductive black (Super P) and carbon nanotube (CNTs) mixture, mass ratio 2:1, Thickener is sodium carboxymethylcellulose (CMC), and binder is aqueous polyacrylamide lonitrile copolymer；The present embodiment silicon materials are above-mentioned step Suddenly the polyaniline-coated of (2) preparation aoxidizes sub- silicon, and the individual particle component in above-mentioned composite particles graphite is removed in artificial graphite selection Graphite, reason be the general partial size of silicon materials it is smaller, remove the individual particle in composite particles graphite can be relieved top layer compacting It reduces and off-energy density；
Deionized water is added into double planetary mixer, conductive agent is added in whipping process, disperses 20min, 0.4% carboxylic is first added Sodium carboxymethylcellulose pyce stirs 30min；After mixing, 2 artificial graphite of active material and silicon materials mixture is added, it is thick to stir 2 H completes the dispersion process of conductive black and active material 2, adds remaining sodium carboxymethylcellulose, stirs 1 h, and adjustment is viscous Degree adds polyphenyl alkene nitrile binder stirring 30min, finally vacuumizes removing bubble, filtered with 150 mesh stainless steel mesh, i.e., The top layer coating sizing-agent containing 41% admittedly is made.
(c) preparation of the double-deck film layer negative electrode tab
Using the coating machine with bimodulus coating head device bought from equipment manufacturer, two discharge ports of bimodulus coating head all point to apply The applicator roll of cloth machine, the feeder channel that the interior setting of this bimodulus coating head is connected to two discharge ports respectively, is pumped by high-precision screw and is controlled It makes while squeezing out two different slurries, the bilayer of pole piece may be implemented while being coated with.
By above-mentioned 2 prepared kind slurry while it being applied to the ipsilateral of copper foil, the siliceous coating of pulp feeder is in top layer, no Siliceous pure graphite linings are in bottom, and wherein bottom coated face density middle line is 0.00512g/cm2, top layer coated face density middle line For 0.00394g/cm2, wherein coating tolerance by ± 1.5wt% control, coating speed 5m/min, after coating with 5 sections of baking ovens into Row drying, the temperature of every section of oven are respectively 60 DEG C, 80 DEG C, 110 DEG C, 110 DEG C, 100 DEG C, pole piece copper foil side top layer after drying Coating with a thickness of 44 ± 3um, primer coating with a thickness of 56 ± 3um；Repeat the other side bilayer film layer that copper foil is completed in coating； Pressurized treatments are carried out using roll squeezer, so that the compacted density of negative electrode tab is 1.75g/cm2, to complete the double-deck film layer negative electrode tab Preparation；The present embodiment aoxidizes sub- silicon and accounts for the 5% of the total active material weight of negative electrode tab.Wherein negative copper foil selects be equal One of matter copper foil, porous copper foil or copper foil with painting layer of charcoal.Wherein conductive agent is conductive black Super P, gas phase generates One of carbon fiber VGCF, graphene or carbon nanotube CNTs or several mixtures.The binder is aqueous binders, Specially styrene butadiene rubber sbr, nitrile rubber, butadiene rubber, modified styrene butadiene rubber, Sodium Polyacrylate PAA-Na, aqueous poly- third One of alkene lonitrile copolymer or polyacrylate or several mixtures；The thickener be sodium carboxymethylcellulose CMC and Organic silicon modified by polyether polymer etc. has one or several kinds of mixtures of thickening effect.
(3) lithium ion battery is prepared:
By the positive plate of preparation, negative electrode tab, diaphragm selection substrate+single side ceramics+double spread between positive/negative plate it is compound every Then film is wound the core that the winding-structure of positive outsourcing is made using up- coiler, is encapsulated using aluminum plastic film, dried under vacuum state After roasting 48h removes moisture removal, electrolyte is injected, battery is being melted into and is being sorted, rectangular soft bag lithium ionic cell is being obtained, is denoted as C1.Wherein electrolyte uses the electrolyte of conventional electrolysis formula of liquid preparation: LiPF6+ solvent (EC+FEC+PC+DEC+SN+PS).
Embodiment 2
The present embodiment and the different place of embodiment 1 are: the ratio of the sub- silicon of oxidation in negative electrode active material 2 is 20%；It is double-deck The bottom coated face density of coating is 0.00768 g/cm2, top layer coated face density is 0.00158g/cm2, top level slurry consolidates Containing being 38%, it is dry after pole piece copper foil side top coat with a thickness of 24 ± 3um, primer coating with a thickness of 74 ± 3um；? To lithium ion battery, it is denoted as C2.
Embodiment 3
The present embodiment and the different place of embodiment 1 are: the ratio of the sub- silicon of oxidation in negative electrode active material 2 is 30%；It is double-deck The bottom coated face density of coating is 0.00852 g/cm2, top layer coated face density is 0.00089g/cm2, top level slurry consolidates Containing being 38%, it is dry after pole piece copper foil side top coat with a thickness of 20 ± 3um, primer coating with a thickness of 82 ± 3um；? To lithium ion battery, it is denoted as C3.
Embodiment 4
The present embodiment place different from embodiment 1 is: the sub- silicon of oxidation accounts for the total active material mass fraction of negative electrode tab and is 10%；The ratio of the sub- silicon of oxidation in negative electrode active material 2 is 20%；Double-coated bottom coated face density is 0.00512 g/ cm2, top layer coated face density is 0.00316g/cm2, containing admittedly for top level slurry is 40%, and pole piece copper foil side top layer applies after drying The top coat of layer with a thickness of 37 ± 3um, primer coating with a thickness of 60 ± 3um；Roll-in is compacted 1.70 g/cm2, obtain lithium Ion battery is denoted as C4.
Embodiment 5
The present embodiment place different from embodiment 1 is: the sub- silicon of oxidation accounts for the total active material mass fraction of negative electrode tab and is 20%；The ratio of the sub- silicon of oxidation in negative electrode active material 2 is 30%；Double-coated bottom coated face density is 0.00342g/ cm2, top layer coated face density is 0.00351g/cm2, containing admittedly for base pastes is 41%, and pole piece copper foil side top layer applies after drying Layer with a thickness of 48 ± 3um, primer coating with a thickness of 37 ± 3um；Roll-in is compacted 1.60 g/cm2, lithium ion battery is obtained, It is denoted as C5.
Comparative example 1
The present embodiment place different from embodiment 1 is: coating is single layer, aoxidizes sub- silicon and accounts for negative electrode tab gross activity material mass Score is 5%；0.00899 g/cm is pressed for 2 slurry of active material2Surface density is coated, the painting of pole piece copper foil side after drying Layer obtains lithium ion battery, is denoted as C6 with a thickness of 95 ± 3um.
Comparative example 2
The present embodiment place different from embodiment 1 is: coating is single layer, is that the slurry of active material 1 presses 0.01024g/ cm2Surface density is coated, and the coating layer thickness of pole piece copper foil side is 102 ± 3um after drying, is obtained lithium ion battery, is denoted as C7。
Comparative example 3
The present embodiment place different from embodiment 1 is: duplex coating takes the first face priming operation slurry in copper foil, drying Afterwards, then copper foil another side barrier coating slurry, then in primer coating be coated with top level slurry with above-mentioned step 1 sample, it is dry Afterwards pole piece copper foil side top coat with a thickness of 44 ± 3um, primer coating with a thickness of 58 ± 3um, obtain lithium ion battery, It is denoted as C8.
Table 1 provides 1 ~ 3 main relevant parameters table of embodiment 1 ~ 5 and comparative example
Table 2 provides the property of the resulting lithium ion battery C1 ~ C5 of embodiment 1 ~ 6 and the resulting lithium ion battery C6 ~ C8 of comparative example 1 ~ 3 It can test result.Wherein,
Cathode compacted density: cathode pole piece is cold-pressed the density after 1h.
Cathode gram volume: battery discharge capacity and negative electrode active material mass ratio for the first time.
Energy density: 25 DEG C, 0.2C constant-current charge to 4.45V, then constant-voltage charge to 0.025C；Then 0.2C is discharged into 2.75V measures energy density at this time；
Battery protects liquid measure: battery protects liquid measure=bis- and is honored as a queen battery weight+air bag weight-encapsulation original weight, unit g；
Full electricity first charge discharge efficiency: using 0.1C constant-current charge to upper limit voltage, then constant pressure is charged to 0.02C current cut-off, then uses 0.1C constant-current discharge, discharge capacity and initial charge capacity are compared up to full battery first charge discharge efficiency.
Battery cycle life test:
By the resulting lithium ion battery C1 ~ C5 of embodiment 1 ~ 5 and the resulting lithium ion battery C6 ~ C8 of comparative example, at 25 DEG C, with 1C multiplying power constant-current charge is to 4.45V, the then constant-voltage charge at 4.45V, cut-off current 0.025C, later again with 0.5C multiplying power Constant-current discharge, blanking voltage are 2.75V, this is a charge and discharge cycles process, the charge and discharge cycles process are repeated, until battery Capacity retention ratio be lower than 80%.
Cathode analyses lithium test:
By the resulting lithium ion battery C1 ~ C5 of embodiment 1 ~ 5 and the resulting lithium ion battery C6 ~ C8 of comparative example, respectively at 25 DEG C Under, with 1.5C multiplying power constant-current charge to 4.45V, the then constant-voltage charge at 4.45V, cut-off current 0.025C, later again with 1C multiplying power constant-current discharge, blanking voltage are 2.75V, this is a charge and discharge cycles process, are repeated 10 times the charge and discharge cycles mistake Journey.After battery expired fill, in drying shed environment, disassemble battery core, observe the analysis lithium situation of negative terminal surface.Analyse lithium degree point Not analyse, lithium, slightly analysis lithium, moderate analyse lithium and serious analysis lithium test result is as shown in table 1.Slight analysis lithium indicates negative terminal surface Analysis lithium region be the 1/10 of overall region hereinafter, seriously analysis lithium indicates that the analysis lithium region of negative terminal surface is more than overall region 1/3 。
The performance test results of 2 embodiment 1 ~ 5 of table and comparative example 1 ~ 3
From the results shown in Table 2, embodiment 1 ~ 5 is compared with comparative example 1&2, using the guarantor of battery made from the method for the present invention Liquid measure and energy density have the cycle life for promoting and extending battery.Embodiment 5 due in negative electrode tab silicone content it is excessive, follow The ring service life, which exists, to be deteriorated, and reason is the electron conduction of material entirety have been damaged in silicon materials repeatedly expansion process, and expose New cathode interface exist and form a film repeatedly, capacity attenuation caused by 2 kinds of factor interactions is fast；Phase between embodiment 1,2 and 3 Than, it can be seen that the ratio increase of the sub- silicon of the oxidation of top layer coating can reduce top layer coated face density, reduce the thickness of top coat Degree will not deteriorate the limit compacting of pole piece, but top layer content can deteriorate the first charge discharge efficiency of pole piece too much；Embodiment 2,4 and 5 it Between compare, under top layer silicon material content is 20 ~ 30%, if the total amount that silicon accounts for negative electrode tab increases, the thickness of top coat be will increase, It will be greatly reduced full battery first charge discharge efficiency and the compacting of the cathode limit；Embodiment 1 is compared with comparative example 2, and use is produced by the present invention Full battery first charge discharge efficiency plays more preferably and energy density is higher, and cycle performance is also more excellent；Why the embodiment of the present invention 1 is than comparison Example 3 is to walk separately baking than separated painting because embodiment 1 contains silicon coating while coating roll-in simultaneously using primer coating and top layer well The painting interlayer fourth of the twelve Earthly Branches cooperation of the dry double-deck pole piece is used by force, is not in apply interlayer segregation phenomenon, therefore can guarantee material entirety Electron conduction, and present invention process processing procedure is more energy efficient, is simply more able to satisfy industry requirement.As seen from Table 2, using embodiment The preparation of material in 2, obtained lithium battery integrated performance are best.
Battery side reaction product can deposit between the hole of cathode, can reduce the porosity of negative electrode material, closer from diaphragm, The porosity reduction of negative electrode material is more serious, and cathode concentration polarization is bigger, and embedding lithium speed is slower, will produce when charging current is too big Raw analysis lithium phenomenon；Why lithium ion battery C1 ~ C5 of negative electrode tab of the invention can improve charging performance, be because of and this hair The charging expansion characteristics of silicon materials are utilized in bright negative electrode tab, improve the porosity close to diaphragm side, so that battery protects liquid measure Increase；It is because silicone content is excessive in negative electrode tab why embodiment 5, which analyses lithium, and silicon materials have damaged material in expansion process repeatedly Whole electron conduction, and the new cathode interface of exposure, in the presence of forming a film repeatedly, 2 kinds of factor interactions lead to the pole of battery Change and increase, cathode is caused to reach analysis lithium current potential in advance.
Negative electrode tab of the invention has both high-pressure solid and high capacity performance, and preparation method simple process, lithium ion obtained Battery has energy density height and battery protects liquid measure height, extends battery cycle life；And the charging performance of battery is improved, The analysis lithium window of battery is expanded, battery is safer in practical applications；
Various pieces are described in a progressive manner in this specification, what each some importance illustrated be with other parts not Same place, same or similar part may refer to each other between various pieces.Syntagmatic between each component is not just Form disclosed in embodiment, the foregoing description of the disclosed embodiments, make professional and technical personnel in the field can be realized or Use the present invention.Various modifications to these embodiments will be apparent for a person skilled in the art, in the present invention Defined General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Cause This, the present invention is not intended to be limited to embodiment shown in the present invention, and is to fit to and principles of this disclosure and new The consistent widest range of clever feature.

Claims (8)

1. a kind of negative electrode tab, including negative current collector and coated on the film layer on the collector, it is characterised in that: the film layer It is divided into two layers, first layer film layer is the bottom equadag coating close to collector；Second layer film layer is that the top layer far from collector contains Silicon coating；Wherein, top layer is 5wt.% ~ 30wt.% containing silicon materials ratio in silicon coating；It is total to account for negative electrode tab for silicon materials in negative electrode tab The 5% ~ 20% of active material weight；Coating drying after, bottom equadag coating with a thickness of 44 ~ 85um, thickness of the top layer containing silicon coating Degree is 20 ~ 48um.
2. a kind of negative electrode tab according to claim 1, it is characterised in that: bimodulus coating head extrusion coater is used, by 2 kinds Slurry is applied on negative current collector simultaneously, and after the ipsilateral formation double-coating cream structure of negative current collector, siliceous painting is made Layer is in top layer, double-deck coating negative electrode tab of the not siliceous pure graphite linings in bottom；After being painted with the one side of collector, repeating will be another It is coated in the manner described above on one side.
3. a kind of negative electrode tab according to claim 1, it is characterised in that: the negative current collector is homogeneous copper foil, porous Copper foil and with applying one of layer of charcoal copper foil.
4. a kind of negative electrode tab according to claim 1, it is characterised in that: two layers of film layer be containing negative electrode active material, The composite material of conductive agent, binder and thickener；If bottom equadag coating, then the dry powder weight ratio comprising substance is negative Pole active material: conductive agent: binder: thickener=95 ~ 98 %:0 ~ 2 %:1 ~ 1.5%:1 ~ 1.5%, negative electrode active material are stone Ink；Contain silicon coating if top layer, then the ratio comprising substance is negative electrode active material: conductive agent: binder: thickener=92.5 ~ 97 %: 1 ~ 3 %: 1.5 ~ 3%: 0.5% ~ 1.5%, negative electrode active material is graphite and silicon materials.
5. a kind of negative electrode tab according to claim 4, it is characterised in that: the silicon materials are that conductive polymer is contained on surface The composite material and SiO of the silicon alloy of polymer, silicon and carbonxOne of or several mixtures, wherein 0.5 > x > 2, institute Stating conductive polymer polymer is one of polyaniline, polythiophene, polypyrrole or several mixtures.
6. a kind of negative electrode tab according to claim 4, it is characterised in that: the conductive agent is conductive black Super P, gas Mutually generate one of carbon fiber VGCF, graphene or carbon nanotube CNTs or several mixtures.
7. a kind of negative electrode tab according to claim 4, it is characterised in that: the binder is aqueous binders, the water Property binder be styrene butadiene rubber sbr, it is nitrile rubber, butadiene rubber, modified styrene butadiene rubber, Sodium Polyacrylate PAA-Na, aqueous One of polyacrylonitrile copolymer and polyacrylate or several mixtures；The thickener is the carboxylic with thickening effect Sodium carboxymethylcellulose pyce CMC and/or organic silicon modified by polyether polymer.
8. lithium ion battery of the one kind containing negative electrode tab described in claim 1 ~ 7 any claim, it is characterised in that: described Lithium ion battery includes positive plate, negative electrode tab, diaphragm and electrolyte.
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