CN107958997A - Anode sizing agent, anode pole piece and lithium ion battery - Google Patents
Anode sizing agent, anode pole piece and lithium ion battery Download PDFInfo
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- CN107958997A CN107958997A CN201610896687.0A CN201610896687A CN107958997A CN 107958997 A CN107958997 A CN 107958997A CN 201610896687 A CN201610896687 A CN 201610896687A CN 107958997 A CN107958997 A CN 107958997A
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- sizing agent
- anode sizing
- positive electrode
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- 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
- H01M4/364—Composites as mixtures
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- 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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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- 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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- 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
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- 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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- 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
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- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
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- 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
- H01M4/625—Carbon or graphite
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention provides a kind of anode sizing agent, anode pole piece and lithium ion battery.The anode sizing agent includes positive electrode active materials, conductive agent and bonding agent.The positive electrode active materials include the first positive electrode active materials particle of pH value >=11.5.The bonding agent includes fluoropolymer.The anode sizing agent further includes：Additive.The anode sizing agent of the present invention has preferable mobility and stability, efficiently solve the gel run into anode pole piece process, jelly, agglomeration traits, improve the excellent rate of production, ensure the uniformity of lithium ion battery, while improve storage life and the high temperature circulation stability that lithium ion battery uses under high voltages.
Description
Technical field
The present invention relates to battery technology field, more particularly to a kind of anode sizing agent, anode pole piece and lithium ion battery.
Background technology
Compared with other traditional secondary batteries, it is many excellent that lithium ion battery has that small, voltage is high, energy density is high etc.
Point, achieves a series of rapid progresses in consumer electronics fields such as mobile phone, notebooks.With the flourishing hair of new energy cause
Exhibition, the just positive exploitation high power density of more and more researchers, high circulation stability, the lithium-ion electric of high security
Pond, to its power battery as electric car.In numerous positive electrode active materials that lithium ion battery uses, layer structure
Lithium nickel cobalt manganese (NCM), lithium nickel cobalt aluminium (NCA) are due to having the characteristics that discharge capacity is high, have a safety feature, stable structure is considered
It is one of optimal selection of following power lithium-ion battery positive electrode active materials.
But compared to traditional cobalt acid lithium (LCO) and LiMn2O4 (LMO), the higher nickelic material of NCM especially Ni contents
Material, such as NCM622, NCM811 and NCA have higher pH value, it is with PVDF systems bonding agent in stirring, pole piece process
In be frequently encountered because the F in PVDF is by OH-Caused by attack the problem of gel, jelly, reunion, lithium ion has been seriously affected
The performance of battery.
Many researchers attempt to solve the problems, such as these by improving the physical property of positive electrode active materials in itself.Such as improve burning
Junction temperature or increase atmosphere purging, but can so cause particle increase or Li volatilizations excessively to bring positive electrode active materials lithium to contain
Amount deficiency, does not reach the performance of design finally.
In addition, for NCM, NCA material of high alkalinity (i.e. high ph-values), reduced through the method frequently with washing or pickling
The acid-base value on its surface, but water or acid are highly polar materials, on the one hand can cause some ions of surface of positive electrode active material
Dissolution, such as Li, Ni, Co, Mn, destroy the surface texture of positive electrode active materials, and on the other hand, remaining hydrone has on a small quantity
It is diffused into inside particle, is not easy to remove, to be completely eliminated, it is necessary to carry out high temperature sintering again, and a part of Li can be caused to analyse
Go out, a small amount of Li is formed on surface2CO3Deng material, the mutually poor lithium of body and surface texture is caused to change.Second method is strictly to control
The water content of each auxiliary material is to ppm ranks during stirring, and places slurry in relatively low ambient humidity, but this method cost
It is huge, in the case of not extensive production capacity, the cost of lithium ion battery will be greatly increased.The third method is stirred
Ring letones are added in journey to improve the gellation of slurry, addition ring letones influence most the performance of lithium ion battery
It is small, but ring class ketone material has high carcinogenicity and stronger volatility, the safety of operator can be had an impact, therefore
Gradually abandon using.
The content of the invention
In view of problem present in background technology, it is an object of the invention to provide a kind of anode sizing agent, anode pole piece and
Lithium ion battery, the anode sizing agent have preferable mobility and stability, efficiently solve in anode pole piece process
The gel that runs into, jelly, agglomeration traits, improve the excellent rate of production, it is ensured that the uniformity of lithium ion battery, while improve lithium ion
The storage life and high temperature circulation stability that battery uses under high voltages.
In order to achieve the above object, in one aspect of the invention, the present invention provides a kind of anode sizing agent, it includes cathode
Active material, conductive agent and bonding agent.The positive electrode active materials include the first positive electrode active materials of pH value >=11.5
Grain.The bonding agent includes fluoropolymer.The anode sizing agent further includes：Additive shown in formula 1.Wherein, R11Selected from carbon
Atomicity be 1~4 alkylidene, R21、R22It is each independently selected from-COO- ,-SO3- in one kind (C atoms and R in-COO-11
Connection ,-SO3- middle S atom and R11Connection), R31、R32It is each independently selected from H, the alkyl that carbon number is 1~8, carbon atom
Count one kind in the aryl that the alkenyl for 2~8, the alkynyl that carbon number is 2~8, carbon number are 6~12, alkylidene, alkane
Base, alkenyl, alkynyl, aryl can also be substituted by the one or more in F, Cl, Br, I.
R31-R21-R11-R22-R32Formula 1
In another aspect of this invention, the present invention provides a kind of anode pole piece, it includes plus plate current-collecting body and setting
In the cathode diaphragm on plus plate current-collecting body.The cathode diaphragm includes the anode sizing agent described according to an aspect of the present invention.
In still another aspect of the invention, the present invention provides a kind of lithium ion battery, it includes the opposing party according to the present invention
Anode pole piece described in face.
Relative to the prior art, beneficial effects of the present invention are：
The anode sizing agent additive of the present invention can effectively stablize high ph-values or high-specific surface area positive electrode active materials just
The gel that is run into the pole piece process of pole, jelly, agglomeration traits, improve the excellent rate of production, it is ensured that lithium ion battery it is consistent
Property.It is also possible to improve storage life and the high temperature circulation stability that lithium ion battery uses under high voltages.
Anode sizing agent synthesis of the invention is easy, of low cost, is easy to industrialization promotion.
Embodiment
The following detailed description of anode sizing agent according to the present invention, anode pole piece and lithium ion battery.
Illustrate anode sizing agent according to a first aspect of the present invention first.
Anode sizing agent according to a first aspect of the present invention includes positive electrode active materials, conductive agent and bonding agent.It is described just
Pole active material includes the first positive electrode active materials particle of pH value >=11.5.The bonding agent includes fluoropolymer.It is described
Anode sizing agent further includes：Additive shown in formula 1.Wherein, R11Selected from the alkylidene that carbon number is 1~4, R21、R22Each solely
On the spot it is selected from-COO- ,-SO3- in one kind (C atoms and R in-COO-11Connection ,-SO3- middle S atom and R11Connection), R31、R32
It is each independently selected from H, the alkynes that the alkenyl that the alkyl that carbon number is 1~8, carbon number are 2~8, carbon number are 2~8
One kind in base, the aryl that carbon number is 6~12, alkylidene, alkyl, alkenyl, alkynyl, aryl can also be by F, Cl, Br, I
One or more of substitutions.
R31-R21-R11-R22-R32Formula 1
In formula 1, R21、R22It is each independently selected from-COO- ,-SO3- in one kind, it is with stronger electrophilic energy
Power, can make-CnH2nCarbon in-(alkylidene that R1 is represented) forms carbanion, and under the catalysis of high ph-values, fluoropolymer
H in thing bonding agent, which is easily attracted, to be sloughed, and remaining active group is combined with carbanion, so as to inhibit because of fluoropolymer
Caused by being crosslinked between bonding agent itself the problems such as gel, jelly, reunion, and then improve the stability of anode sizing agent.
In the anode sizing agent described according to a first aspect of the present invention, the additive shown in formula 1 is in following compounds
One or more；
In the anode sizing agent described according to a first aspect of the present invention, the quality of the additive shown in formula 1 is positive-active
The 0.1%~2% of the quality of material.Preferably, the quality of the additive shown in formula 1 is the quality of positive electrode active materials
0.3%~0.5%.
In the anode sizing agent described according to a first aspect of the present invention, the positive electrode active materials can be only by pH value >=11.5
The first positive electrode active materials particle composition.
In the anode sizing agent described according to a first aspect of the present invention, the first positive electrode active materials particle is selected from lithium nickel
One or more in cobalt manganese (NCM) ternary material, lithium nickel cobalt aluminium (NCA) ternary material, lithium-rich manganese base material.Wherein, it is described
PH value >=11.5 of first positive electrode active materials particle in itself, it is with fluoropolymer bonding agent in stirring, pole piece process
In easily there is the problem of gel, jelly, reunite, and this can be solved the problems, such as by adding the additive shown in formula 1.
In the anode sizing agent described according to a first aspect of the present invention, the positive electrode active materials further include the work of the second cathode
Property material granule, the second positive electrode active materials particle be selected from cobalt acid lithium, LiMn2O4, LiFePO4, nickel ion doped, ferric phosphate
One or more in manganese lithium, ferrous acid lithium.When by the first positive electrode active materials particle of pH value >=11.5 and the second positive-active
When material granule is used in mixed way, it is still likely to occur gel, fruit with fluoropolymer bonding agent in stirring, pole piece process
The problem of freezing, reuniting, and this can be solved the problems, such as by adding the additive shown in formula 1.
In the anode sizing agent described according to a first aspect of the present invention, the quality of the second positive electrode active materials particle is
The 2%~50% of the quality of the first positive electrode active materials particle.
In the anode sizing agent described according to a first aspect of the present invention, the fluoropolymer be selected from Kynoar, partially
Viton copolymers, polytetrafluoroethylene (PTFE), vinylidene-tetrafluoroethylene-propylene terpolymer, vinylidene-six
Fluoropropene-tetrafluoroethylene terpolymer, vinylidene-chlorotrifluoroethylene, tetrafluoraoethylene-hexafluoropropylene copolymer,
One or more in fluorinated acrylate resin.
In the anode sizing agent described according to a first aspect of the present invention, the conductive agent be selected from conductive black, superconduction carbon black,
One or more in electrically conductive graphite, acetylene black, Ketjen black, graphene, carbon nanotubes.
In the anode sizing agent described according to a first aspect of the present invention, the anode sizing agent further includes solvent.The solvent
It can be 1-methyl-2-pyrrolidinone (NMP).
In the anode sizing agent described according to a first aspect of the present invention, anode sizing agent is prepared using conventional method, such as
First additive and positive electrode active materials can be premixed, prepare anode sizing agent with conductive agent, bonding agent premix afterwards, also can be first by just
After pole active material, conductive agent, bonding agent are mixed with solvent in advance, additive is added in whipping process.
Secondly the anode pole piece of explanation according to a second aspect of the present invention.
Anode pole piece according to a second aspect of the present invention includes plus plate current-collecting body and is arranged on plus plate current-collecting body just
Pole diaphragm, wherein, the cathode diaphragm is is formed by the anode sizing agent described according to a first aspect of the present invention.Particularly, institute
Cathode diaphragm is stated to remove the coat formed after solvent by the anode sizing agent drying described according to a first aspect of the present invention.Its
In, the cathode diaphragm includes positive electrode active materials, conductive agent and bonding agent.The positive electrode active materials include pH value >=
11.5 the first positive electrode active materials particle.The bonding agent includes fluoropolymer.The cathode diaphragm further includes：The institute of formula 1
The additive shown.Wherein, R11Selected from the alkylidene that carbon number is 1~4, R21、R22It is each independently selected from-COO- ,-SO3-
In one kind, R31、R32It is each independently selected from H, the alkenyl that the alkyl that carbon number is 1~8, carbon number are 2~8, carbon original
One kind in the aryl that alkynyl that subnumber is 2~8, carbon number are 6~12, alkylidene, alkyl, alkenyl, alkynyl, aryl may be used also
Substituted by the one or more in F, Cl, Br, I.
R31-R21-R11-R22-R32Formula 1
In the anode pole piece described according to a second aspect of the present invention, the additive shown in formula 1 is in following compounds
One or more；
In the anode pole piece described according to a second aspect of the present invention, the quality of the additive shown in formula 1 is positive-active
The 0.1%~2% of the quality of material.Preferably, the quality of the additive shown in formula 1 is the quality of positive electrode active materials
0.3%~0.5%.
In the anode pole piece described according to a second aspect of the present invention, the positive electrode active materials can be only by pH value >=11.5
The first positive electrode active materials particle composition.
In the anode pole piece described according to a second aspect of the present invention, the first positive electrode active materials particle is selected from lithium nickel
One or more in cobalt manganese (NCM) ternary material, lithium nickel cobalt aluminium (NCA) ternary material, lithium-rich manganese base material.
In the anode pole piece described according to a second aspect of the present invention, the positive electrode active materials also the second positive-active material
Expect particle, the second positive electrode active materials particle is selected from cobalt acid lithium, LiMn2O4, LiFePO4, nickel ion doped, phosphoric acid ferrimanganic
One or more in lithium, ferrous acid lithium.
In the anode pole piece described according to a second aspect of the present invention, the quality of the second positive electrode active materials particle is
The 2%~50% of the quality of the first positive electrode active materials particle.
In the anode pole piece described according to a second aspect of the present invention, the fluoropolymer be selected from Kynoar, partially
Viton copolymers, polytetrafluoroethylene (PTFE), vinylidene-tetrafluoroethylene-propylene terpolymer, vinylidene-six
Fluoropropene-tetrafluoroethylene terpolymer, vinylidene-chlorotrifluoroethylene, tetrafluoraoethylene-hexafluoropropylene copolymer,
One or more in fluorinated acrylate resin.
In the anode pole piece described according to a second aspect of the present invention, the conductive agent be selected from conductive black, superconduction carbon black,
One or more in electrically conductive graphite, acetylene black, Ketjen black, graphene, carbon nanotubes.
Illustrate lithium ion battery according to a third aspect of the present invention again, it includes described according to a second aspect of the present invention
Anode pole piece.
With reference to embodiment, the application is expanded on further.It is to be understood that these embodiments be merely to illustrate the application without
For limiting scope of the present application.
Comparative example 1
Positive electrode active materials are lithium nickel cobalt aluminium Li1.05Ni0.80Co0.15Al0.05O2(commercialization NCA products, D50=12 μm, pH
=11.95), conductive agent is acetylene black (SP) and carbon nanotubes (CNT), and bonding agent is Kynoar (PVDF), each component
Weight ratio is NCA:SP:CNT:PVDF=96:1.5:0.5:2, solvent is 1-methyl-2-pyrrolidinone (NMP), is consolidated in anode sizing agent
Content is 60%.
Concrete operations are as follows：By SP and PVDF dry powder blends, carried out with the mixing parametric of the 20rpm that revolves round the sun, rotation 1000rpm
10min is dry-mixed；CNT pre-dispersed liquids (solid content 20%) and the NMP of 40% volume are added, stirs 10min；NCA is added, with public affairs
Turn 25rpm, rotation 2000rpm mixing parametric carry out 90min pre- kneading stirring；Add the NMP of remaining 60% volume, stirring
30min；The range of viscosities for adjusting anode sizing agent is 3000~4500mPas, tests granularity, is transferred to spare in transfer tank.
Embodiment 1
Positive electrode active materials are nickel cobalt lithium aluminate Li1.05Ni0.80Co0.15Al0.05O2(commercialization NCA products, D50=12 μm,
PH=11.95), conductive agent is acetylene black (SP) and carbon nanotubes (CNT), and bonding agent is Kynoar (PVDF), each component
Weight ratio be NCA:SP:CNT:PVDF=96:1.5:0.5:2, additive is compound 1, and the quality of additive is the matter of NCA
The 0.3% of amount, solvent be 1-methyl-2-pyrrolidinone (NMP), and solid content is 60% in anode sizing agent.
Concrete operations are as follows：By SP and PVDF dry powder blends, carried out with the mixing parametric of the 20rpm that revolves round the sun, rotation 1000rpm
10min is dry-mixed；CNT pre-dispersed liquids (solid content 20%) and the NMP of 40% volume are added, stirs 10min；NCA is added, with public affairs
Turn the pre- kneading stirring for stirring progress 90min of 25rpm, rotation 2000rpm；Add the NMP and compound of remaining 60% volume
1, stir 30min；The range of viscosities for adjusting anode sizing agent is 3000~4500mPas, tests granularity, is transferred to transfer tank
In it is spare.
The same embodiment of preparation process of the anode sizing agent of embodiment 2-17, difference lies in the species and content of additive are not
Together, table 1 is for details, reference can be made to, the wherein content of additive is the mass ratio that the quality based on positive electrode active materials obtains.
The preparation of anode pole piece and lithium ion battery will be illustrated next.
Select thickness for 14 μm of aluminium foils as plus plate current-collecting body, comparative example 1 and the anode sizing agent of embodiment 1-17 is uniform
It is coated on double surfaces of aluminium foil, coated face density 2.2mg/cm2, then through 120 DEG C of vacuum drying, cold pressing, cut-parts, point
Bar, obtains anode pole piece.
By anode pole piece, isolation film (polypropylene screen) and graphite cathode pole piece (graphite:SP:SBR:The mass ratio of CMC is
97:1:1.5:0.5, negative current collector is Cu paper tinsels) it is wound into model 426080, the battery core that capacity is 2Ah, electrolyte is injected,
Wherein, electrolyte uses the LiPF of 1mol/L6As lithium salts, with EC/EMC=3:7 (V/V) are used as non-aqueous organic solvent, afterwards
Battery core is melted into, the test such as capacity, completes the preparation of lithium ion battery.
The performance test of lithium ion battery will be illustrated next.
(1) stability test of anode sizing agent
Anode sizing agent to be stored in the environment that humidity is 35%~45%, test stands the viscosity number after different time,
Work as viscosity>During 9000mPas, just it is judged to that gel occurs, the stabilization of anode sizing agent is judged with the anti-gel time of anode sizing agent
Property.Viscosity test uses DV-II+ type BROOKFIELD viscosimeters, is tested anode sizing agent and is contained with 250ml beakers, is measured about
200ml or so anode sizing agents, test the viscosity in the middle part of anode sizing agent.
(2) the bonding force test of anode pole piece
Anode pole piece after cold pressing is cut into the size of 20mm*200mm, carries out 180 ° of tensile tests, tests cathode film
Bonding force between piece and plus plate current-collecting body.
(3) the discharge power test of lithium ion battery
At 25 DEG C, constant-current charge, charge cutoff voltage 4.2V, afterwards with 4.2V constant pressures are carried out with the current density of 0.4A
It is 0.1A to charge to current density, then using the current density constant-current discharge of 0.4A to voltage as 2.8V, obtained discharge capacity is made
For the rated capacity C of lithium ion batteryn(i.e. 100%SOC).
At 25 DEG C, with 0.2CnCurrent density lithium ion battery is charged to the 50% (i.e. 50% of above-mentioned rated capacity
SOC), afterwards respectively at 25 DEG C and -20 DEG C, with 10CnFor pulse current, using the method for HPPC, 25 DEG C and -20 DEG C are tested
The discharge energy density of lower lithium ion battery 50%SOC electric discharges 10s.
(4) the high rate performance test of lithium ion battery
With 0.5CnCurrent density lithium ion battery is charged to blanking voltage is 4.2V, afterwards with 4.2V constant-voltage charges
It is 0.05C to current densityn, then respectively with 0.5Cn、5CnCurrent density to be discharged to voltage be 2.8V, test different electric currents
Discharge capacity under density.
Lithium ion battery 5Cn/0.5CnHigh rate performance=5CnDischarge capacity/0.5C under current densitynUnder current density
Discharge capacity.
(5) the cycle performance test of lithium ion battery
At 25 DEG C, with 3CnCurrent density charge and discharge cycles test is carried out to lithium ion battery, voltage range is arranged to
2.8V~4.2V.
(6) the high-temperature storage performance test of lithium ion battery
At 25 DEG C, with 0.5CnCurrent density lithium ion battery expired be charged to 4.2V, be placed in 60 DEG C of insulating box
Storage is taken out after 30 days, and uses 0.5CnCurrent density be discharged to 2.8V, test the capacity that recovers under 100%SOC, and
Compared with the discharge capacity tested at 25 DEG C, calculate the residual capacity after the storage 30 days of 60 DEG C of lithium ion battery and keep
Rate.
The parameter and the performance test results of 1 comparative example 1 of table and embodiment 1-17
It can be seen that from the data of table 1 compared with comparative example 1, the addition of additive in embodiment 1-17, can effectively prolong
The anti-gel time of long anode sizing agent, reduces in production process and treats material control difficulty, improve plus plate current-collecting body and cathode diaphragm
Between bonding force, and then improve lithium ion battery high rate performance, cycle performance and high-temperature storage performance.
The announcement of book according to the above description, those skilled in the art in the invention can also carry out the above embodiment
Appropriate change and modification.Therefore, the invention is not limited in embodiment disclosed and described above, to the present invention's
Some modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although used in this specification
Some specific terms, but these terms are merely for convenience of description, do not limit the present invention in any way.
Claims (10)
1. a kind of anode sizing agent, including：
Positive electrode active materials；
Conductive agent；And
Bonding agent；
It is characterized in that,
The positive electrode active materials include the first positive electrode active materials particle of pH value >=11.5；
The bonding agent includes fluoropolymer；
The anode sizing agent further includes：
Additive shown in formula 1；
R31-R21-R11-R22-R32Formula 1
Wherein, R11Selected from the alkylidene that carbon number is 1~4, R21、R22It is each independently selected from-COO- ,-SO3- in one kind,
R31、R32Be each independently selected from H, the alkenyl that the alkyl that carbon number is 1~8, carbon number are 2~8, carbon number be 2~
One kind in 8 alkynyl, the aryl that carbon number is 6~12, alkylidene, alkyl, alkenyl, alkynyl, aryl can also by F, Cl,
One or more of substitutions in Br, I.
2. anode sizing agent according to claim 1, it is characterised in that the additive shown in formula 1 is in following compounds
One or more；
3. anode sizing agent according to claim 1, it is characterised in that the quality of the additive shown in formula 1 is positive-active
The 0.1%~2% of the quality of material, is preferably 0.3%~0.5%.
4. anode sizing agent according to claim 1, it is characterised in that the first positive electrode active materials particle is selected from lithium nickel
One or more in cobalt-manganese ternary material, lithium nickel cobalt aluminium ternary material, lithium-rich manganese base material.
5. anode sizing agent according to claim 1, it is characterised in that the positive electrode active materials further include the work of the second cathode
Property material granule, the second positive electrode active materials particle be selected from cobalt acid lithium, LiMn2O4, LiFePO4, nickel ion doped, ferric phosphate
One or more in manganese lithium, ferrous acid lithium.
6. anode sizing agent according to claim 5, it is characterised in that the quality of the second positive electrode active materials particle is
The 2%~50% of the quality of the first positive electrode active materials particle.
7. anode sizing agent according to claim 1, it is characterised in that
The fluoropolymer be selected from Kynoar, vinylidene fluoride-hexafluoropropylene copolymer, polytetrafluoroethylene (PTFE), vinylidene-
Tetrafluoroethylene-propylene terpolymer, biasfluoroethylene-hexafluoropropylene-tetrafluoroethylene terpolymer, vinylidene-trifluoro chlorine
One or more in ethylene copolymer, tetrafluoraoethylene-hexafluoropropylene copolymer, fluorinated acrylate resin.
8. anode sizing agent according to claim 1, it is characterised in that the conductive agent be selected from conductive black, superconduction carbon black,
One or more in electrically conductive graphite, acetylene black, Ketjen black, graphene, carbon nanotubes.
9. a kind of anode pole piece, including plus plate current-collecting body and the cathode diaphragm that is arranged on plus plate current-collecting body,
It is characterized in that,
The cathode diaphragm is is formed as the anode sizing agent any one of claim 1-8.
10. a kind of lithium ion battery, it is characterised in that including anode pole piece according to claim 9.
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| CN111710868A (en) * | 2020-06-30 | 2020-09-25 | 昆山宝创新能源科技有限公司 | High-alkalinity anode slurry and preparation method and application thereof |
| CN111740177A (en) * | 2019-07-26 | 2020-10-02 | 瑞新材料科技(香港)有限公司 | Positive electrode material, positive electrode, battery, and battery pack |
| CN114361452A (en) * | 2021-12-15 | 2022-04-15 | 电子科技大学中山学院 | Adhesive, electrode slurry, and manufacturing method and application thereof |
| CN114599445A (en) * | 2020-02-03 | 2022-06-07 | 日本斯频德制造株式会社 | Slurry storage device, slurry production system, and slurry storage method |
| CN114914447A (en) * | 2022-04-26 | 2022-08-16 | 芜湖天弋能源科技有限公司 | Preparation of gel-resistant anode slurry and preparation method thereof |
| CN115000401A (en) * | 2022-05-27 | 2022-09-02 | 珠海冠宇电池股份有限公司 | Positive electrode active material, positive plate comprising same and battery |
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| CN111740177A (en) * | 2019-07-26 | 2020-10-02 | 瑞新材料科技(香港)有限公司 | Positive electrode material, positive electrode, battery, and battery pack |
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| CN114914447A (en) * | 2022-04-26 | 2022-08-16 | 芜湖天弋能源科技有限公司 | Preparation of gel-resistant anode slurry and preparation method thereof |
| CN114914447B (en) * | 2022-04-26 | 2023-06-02 | 芜湖天弋能源科技有限公司 | Anti-gel positive electrode slurry and preparation method thereof |
| CN115000401A (en) * | 2022-05-27 | 2022-09-02 | 珠海冠宇电池股份有限公司 | Positive electrode active material, positive plate comprising same and battery |
| WO2023226765A1 (en) * | 2022-05-27 | 2023-11-30 | 珠海冠宇电池股份有限公司 | Positive electrode active material, and positive electrode sheet and battery which comprise positive electrode active material |
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