CN106784846A - A kind of high multiplying power lithium ion battery positive pole and its preparation method and application - Google Patents
A kind of high multiplying power lithium ion battery positive pole and its preparation method and application Download PDFInfo
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- CN106784846A CN106784846A CN201710026159.4A CN201710026159A CN106784846A CN 106784846 A CN106784846 A CN 106784846A CN 201710026159 A CN201710026159 A CN 201710026159A CN 106784846 A CN106784846 A CN 106784846A
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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
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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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- 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
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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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
- H01M4/13—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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- 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
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
- H01M4/625—Carbon or graphite
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- H—ELECTRICITY
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- 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
- H01M2004/028—Positive electrodes
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to a kind of lithium ion battery, more particularly, to a kind of high multiplying power lithium ion battery positive pole and its preparation method and application.Positive active material, conductive agent, N-methyl pyrrolidones, Kynoar are configured to anode sizing agent by the present invention；Conductive agent 1, conductive agent 2, stick knot N-methyl pyrrolidones are configured to carbon coating slurry；Anode sizing agent, carbon coating slurry are coated on plus plate current-collecting body successively, are dried, to be rolled and obtain surface after film, cutting and apply charcoal positive plate, with negative plate, barrier film, housing assembling after fill electrolyte, obtain high multiplying power lithium ion battery after activated, sorting.The present invention is to form layer of charcoal in positive electrode surface using the purpose that charcoal positive pole is applied on surface, increases positive electrode surface conduction and the capacity of heat transmission, so as to significantly improve the fast charging and discharging performance of battery.
Description
Technical field
The present invention relates to a kind of lithium ion battery, more particularly, to a kind of high multiplying power lithium ion battery positive pole and its preparation side
Method and application.
Background technology
The features such as lithium ion battery has operating voltage high, big energy density and excellent cycle performance, in recent years in mobile electricity
Sub- equipment, electric tool and electric automobile field are used widely.With the continuous lifting of user's request, such as unmanned plane, vapour
Requirement of the standby priming supply of car to the high-multiplying power discharge of battery, requirement of the electric automobile to electrokinetic cell quick charge, urgently
Needing exploitation can carry out the high-rate type lithium ion cell of fast charging and discharging.
Raising electrodes conduct and the capacity of heat transmission are that the design of high-multiplying-power battery needs the key factor for considering.Lithium ion battery
Negative electrode active material is graphite, with good conduction and heat conductivility.And positive active material is mainly cobalt acid lithium, mangaic acid
The lithium intercalation compounds such as lithium, nickle cobalt lithium manganate, LiFePO4, conductive and heat conductivility is relatively poor, when battery fills under high magnification
During electric discharge, high current is generated heat by easily leading electrode, and because capacity of heat transmission difference easily produces internal temperature of battery point
Cloth is uneven, so as to significantly affect discharge performance, cyclical stability and the security performance of battery.Therefore, improve the conductive of positive pole and
The capacity of heat transmission is significant for exploitation high power type lithium ion battery.
The content of the invention
It is an object of the invention to provide a kind of high multiplying power lithium ion battery positive pole and its preparation method and application, by just
Pole active material surface coating layer of charcoal, makes positive pole increase extra an electronic conductive coating and heat conducting coating, so as to significantly carry
Rise battery high-rate characteristics.
A kind of high multiplying power lithium ion battery positive pole of the present invention；The high multiplying power lithium ion battery positive pole includes collector, just
Pole coating layer of active substance and carbon coating；The positive active material coating uniform is attached to collection liquid surface, the carbon coating
It is uniform to be attached to positive active material coating surface, the collector, positive active material coating, carbon coating constitute collector/
The high multiplying power lithium ion battery positive pole of positive active material coating/carbon coating.
A kind of high multiplying power lithium ion battery positive pole of the present invention；Described carbon coating is the coating of graphene-containing.
Preferably, a kind of high multiplying power lithium ion battery positive pole of the invention；The thickness of the carbon coating of the graphene-containing
Spend is 1-5 μm.
A kind of high multiplying power lithium ion battery positive pole of the present invention；The carbon coating of the graphene-containing includes by percentage to the quality
Following components：
Stick knot 5-10%,
The 5%-50% of conductive agent 1,
The 45%-90% of conductive agent 2；
The conductive agent 1 is Graphene；The conductive agent 2 is selected from conductive carbon black, acetylene black, carbon fiber, CNT
At least one.
A kind of high multiplying power lithium ion battery positive pole of the present invention；The bonding agent is Kynoar (PVDF).
A kind of preparation method of high multiplying power lithium ion battery positive pole of the present invention, comprises the steps：
The preparation of step one positive active material coating paste
In mass ratio, positive active material：Conductive agent：Kynoar (PVDF)=85-98：1-10：1-10, be preferably
90-94:3-5:3-5, with taking positive active material, conductive agent, Kynoar (PVDF), will match somebody with somebody take positive active material,
Conductive agent, Kynoar (PVDF) and N-methyl pyrrolidones (NMP), it is well mixed, obtains N-methyl pyrrolidones (NMP)
Mass percentage concentration is the positive active material coating paste of 25%-60%；The positive active material is selected from cobalt acid lithium, nickel cobalt
At least one in LiMn2O4, LiFePO4, nickel cobalt lithium aluminate, LiMn2O4；The conductive agent be selected from conductive carbon black, acetylene black,
At least one in carbon fiber, CNT；
The preparation of the carbon coating slurry of step 2 graphene-containing
In mass ratio, conductive agent 1:Conductive agent 2:Stick knot=2-95：0-90：2-20, preferably 5-50：45-90：5-
10, with taking binding agent, conductive agent 1, conductive agent 2, and binding agent, conductive agent 1, conductive agent 2 and the N-methyl pyrrolidines for taking will be matched somebody with somebody
Ketone is well mixed to obtain carbon coating slurry；In the carbon coating slurry, the mass percentage concentration of N-methyl pyrrolidones is 50%-
70%；
Step 3 is coated
Positive active material coating paste is coated on collector, NMP in positive active material coating paste is baked to
Content drop to 5wt%-8wt%, be coated with carbon coating slurry；It is baked to positive active material coating paste and charcoal is applied
After N-methyl pyrrolidones (NMP) in layer slurry is removed completely, the high multiplying power lithium ion battery positive pole is obtained.
Preferably, the preparation method of a kind of high multiplying power lithium ion battery positive pole of the invention, in step 3, prepares high
During magnification lithium ion battery positive pole, carried out by following stages：
Stage one applies one side
The tow sides of plus plate current-collecting body are respectively defined as A faces and B faces, positive active material coating paste is coated in
On the A faces of plus plate current-collecting body, baking is baked to the content of N-methyl pyrrolidones (NMP) in positive active material coating paste
5wt%-8wt% is dropped to, obtaining A faces has the collector of positive active material coating, then applied in positive active material coating
Upper coating carbon coating slurry, baking is baked to the N-methyl pyrroles in positive active material coating paste and carbon coating slurry
Alkanone (NMP) obtains collector of the A faces with positive active material coating and carbon coating after removing completely；
Stage two applies two-sided
Positive active material coating paste is coated on the B faces of plus plate current-collecting body, baking is baked to positive active material painting
The content of N-methyl pyrrolidones (NMP) drops to 5wt%-8wt% in layer slurry, is then applied in positive active material coating
Carbon coating slurry is covered, is toasted, be baked to the N-methyl pyrrolidones in positive active material coating paste and carbon coating slurry
(NMP) after removing completely, obtain A faces and B faces be coated with positive active material coating and graphene-containing carbon coating high power
Rate lithium ion cell positive.
In industrial applications, by double-coated the positive pole of the positive pole bed of material and carbon coating by design size roll film,
Cutting obtains surface and applies charcoal positive plate.
Preferably, a kind of preparation method of high multiplying power lithium ion battery positive pole of the invention, the collector is aluminium
Paper tinsel.
A kind of application of high multiplying power lithium ion battery positive pole of the present invention, including the high multiplying power lithium ion battery positive pole is used
In high multiplying power lithium ion battery.
A kind of application of high multiplying power lithium ion battery positive pole of the present invention, the high multiplying power lithium ion battery filled in 10 minutes
Enter the electricity more than 85%, battery is with the capacity of 30C continuous discharges more than the 90% of 1C discharge capacities.
A kind of application of high multiplying power lithium ion battery positive pole of the present invention, the structure of the high multiplying power lithium ion battery is lamination
Structure or multi pole ears winding-structure.
The preparation of the high multiplying power lithium ion battery includes that the preparation of charcoal positive plate, negative plate preparation, assembling, filling are applied in surface
Electrolyte, cell activation, sorting step.Wherein negative plate is prepared, assembled, filling the steps such as electrolyte, cell activation, sorting can
It is conventional steps.
Good effect
Relative to prior art, the present invention has the positive effect that：
(1) layer of charcoal is applied by positive active material surface, positive electrode surface is increased a continuous electronic conduction
With the coating of heat conduction, the effect of collector is functioned similarly to, equivalent to increased an extra electronic conductive coating and heat conduction
Coating, advantageously reduces impedance, the reduction heating of positive pole under high current, and makes pole piece and battery using its excellent thermal conductivity
Interior temperature distribution evenly, prevents the too high decline for causing battery performance of local temperature or generation safety problem, will be so as to aobvious
Write lifting battery high-rate characteristics, cycle performance and security.
(2) Graphene and other conductive Carbon Materials are added in carbon coating, realize using the Graphene of two-dimensional structure and other
The synergy of the conductive charcoal of granular, linear structure, had both formed two-dimentional conductive and heat conduction network, double guarantees and top layer active material table
Face and intergranular it is fully contacted.
(3) before coating layer of charcoal slurry, anode sizing agent is not dried fully, the content of NMP in the bed of material is kept about 5%-
8%, then carbon coating slurry is sprayed to the surface of anode material layer, be conducive to making carbon coating and coating layer of active substance forming part
Interpenetrate and combine more closely, and form preferably conductive and heat conduction network.
Through the above way, can be filled with 10 minutes using the high multiplying power lithium ion battery prepared by the present invention and be more than
85% electricity, battery is with the capacity of 30C continuous discharges more than the 90% of 1C discharge capacities.
Brief description of the drawings
Fig. 1 is the structural representation of high multiplying power lithium ion battery positive pole designed by the present invention
In Fig. 1,1 is that current collector aluminum foil 2 is that positive active material coating 3 is carbon coating.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment 1
Anode sizing agent is prepared：It is in proportion 92 by nickle cobalt lithium manganate, conductive agent super-P, Kynoar (PVDF)：4：
4 are mixed and stirred for uniformly, being configured to the anode sizing agent for 30wt% containing NMP with N-methyl pyrrolidones (NMP)；
Carbon coating slurry preparation：It is in proportion 50 by Graphene, conductive agent super-P, Kynoar (PVDF)：45：5
It is mixed and stirred for uniformly, being configured to the carbon coating slurry for 70wt% containing NMP with N-methyl pyrrolidones (NMP)；
Apply one side：Anode sizing agent is coated in plus plate current-collecting body aluminium foil wherein one side, the baking zone 1 into coating machine will just
Pole slurry drying drops to 5wt% to the content of NMP；Then carbon coating slurry is sprayed to surface (the control charcoal of anode material layer
The thickness of coating is about 5um), the baking zone 2 into coating machine all dries the NMP in the positive pole bed of material and carbon coating；
Apply two-sided：Anode sizing agent is coated in the another side of plus plate current-collecting body aluminium foil, the baking zone 1 into coating machine is by
The anode sizing agent drying in two faces drops to 5wt% to the content of NMP, and then carbon coating slurry is sprayed to the anode material of firm coating
The surface (thickness of control carbon coating is about 5um) of layer, the baking zone 2 into coating machine is by the positive pole bed of material and carbon coating
NMP is all dried；
Film-making：By double-coated, the positive pole of the positive pole bed of material and carbon coating carries out rolling film, cutting and obtains stacked surface and apply
Charcoal positive plate.
It is prepared by negative plate：With graphitized intermediate-phase carbosphere as lithium ion battery negative pole active materials, conductive agent super-
P, binding agent PVDF, solvent NMP is configured to graphite cathode slurry.Then by cathode size be coated in drying on Copper Foil, rolling,
Cutting obtains stacked negative plate.
Battery makes：Charcoal positive plate, negative plate, barrier film (PP films) are applied into through lamination assembling, filling electrolyte in surface
The operation such as (the EC-DEC-EMC solution of 1.1mol/L LiPF6), cell activation, sorting prepare can fast charging and discharging lithium from
Sub- battery.
The battery size of making is 1265130PL (thickness 12.0mm, width 65mm, length 130mm), nominal capacity
7500mAh.1C discharge capacities are 7600mAh to gained battery at room temperature, are that 1C is put with 30C multiplying power discharging capacity as 6855mAh
The 90.2% of capacitance.Electricity 6550mAh is filled with 6C electric current constant-current constant-voltage chargings 10min at room temperature, being filled with electricity is
86.2%.
As a comparison, using ordinary skill (positive electrode surface uncoated layer of charcoal, other cell making process are identical with parameter)
1C discharge capacities are 7520mAh to same model lithium ion battery prepared by technology at room temperature, are only with 30C multiplying power discharging capacity
2350mAh.Electricity only 2560mAh is filled with 6C electric current constant-current constant-voltage chargings 10min at room temperature.
Embodiment 2
Anode sizing agent is prepared：It is in proportion 93 by cobalt acid lithium, conductive agent super-P, Kynoar (PVDF)：4：3 with
N-methyl pyrrolidones (NMP) is mixed and stirred for uniformly, being configured to the anode sizing agent for 25wt% containing NMP；
Carbon coating slurry preparation：It is in proportion by Graphene, conductive agent super-P, carbon fiber, Kynoar (PVDF)
5：60：30：5 are mixed and stirred for uniformly, being configured to the carbon coating slurry for 50wt% containing NMP with N-methyl pyrrolidones (NMP)；
Apply one side：Anode sizing agent is coated in plus plate current-collecting body aluminium foil wherein one side, the baking zone 1 into coating machine will just
Pole slurry drying drops to 8wt% to the content of NMP；Then carbon coating slurry is sprayed to surface (the control charcoal of anode material layer
The thickness of coating is about 1um), the baking zone 2 into coating machine all dries the NMP in the positive pole bed of material and carbon coating；
Apply two-sided：Anode sizing agent is coated in the another side of plus plate current-collecting body aluminium foil, the baking zone 1 into coating machine is by
The anode sizing agent drying in two faces drops to 8wt% to the content of NMP, and then carbon coating slurry is sprayed to the anode material of firm coating
The surface (thickness of control carbon coating is about 1um) of layer, the baking zone 2 into coating machine is by the positive pole bed of material and carbon coating
NMP is all dried；
Film-making：By double-coated, the positive pole of the positive pole bed of material and carbon coating is carried out rolling film, cutting and obtains multi pole ears structural table
Charcoal positive plate is applied in face.
It is prepared by negative plate：Using Delanium as lithium ion battery negative pole active materials, with CMC, SBR (butadiene-styrene rubber),
Super-P and deionized water are hybridly prepared into graphite cathode slurry.Then cathode size is coated in drying on Copper Foil, roller
Roll, cut and obtain multipole ear structure negative plate.
Battery makes：Charcoal positive plate, negative plate, barrier film (PP/PE composite membranes) are applied into through lamination assembling, filling electrolysis in surface
The operations such as liquid (the EC-DME-EMC solution of 1.2mol/L LiPF6), cell activation, sorting prepare can fast charging and discharging lithium
Ion battery.
The battery size of making is 458580PL (thickness 8.5mm, width 85mm, length 80mm), nominal capacity
2500mAh.1C discharge capacities are 2550mAh to gained battery at room temperature, are that 1C is put with 30C multiplying power discharging capacity as 2335mAh
The 91.5% of capacitance.Electricity 2216mAh is filled with 6C electric current constant-current constant-voltage chargings 10min at room temperature, being filled with electricity is
87.0%.
Embodiment 3
Anode sizing agent is prepared：It is in proportion 90 by phosphoric acid lithium, conductive agent super-P, Kynoar (PVDF)：5：5
It is mixed and stirred for uniformly, being configured to the anode sizing agent for 60wt% containing NMP with N-methyl pyrrolidones (NMP)；
Carbon coating slurry preparation：By Graphene, conductive agent super-P, CNT, Kynoar (PVDF) in proportion
It is 20：60：10：10 are mixed and stirred for uniformly, being configured to the carbon coating for 60wt% containing NMP with N-methyl pyrrolidones (NMP)
Slurry；
Apply one side：Anode sizing agent is coated in plus plate current-collecting body aluminium foil wherein one side, the baking zone 1 into coating machine will just
Pole slurry drying drops to 6wt% to the content of NMP；Then carbon coating slurry is sprayed to surface (the control charcoal of anode material layer
The thickness of coating is about 2um), the baking zone 2 into coating machine all dries the NMP in the positive pole bed of material and carbon coating；
Apply two-sided：Anode sizing agent is coated in the another side of plus plate current-collecting body aluminium foil, the baking zone 1 into coating machine is by
The anode sizing agent drying in two faces drops to 6wt% to the content of NMP, and then carbon coating slurry is sprayed to the anode material of firm coating
The surface (thickness of control carbon coating is about 2um) of layer, the baking zone 2 into coating machine is by the positive pole bed of material and carbon coating
NMP is all dried；
Film-making：By double-coated, the positive pole of the positive pole bed of material and carbon coating is carried out rolling film, cutting and obtains multi pole ears structural table
Charcoal positive plate is applied in face.
It is prepared by negative plate：With graphitized intermediate-phase carbosphere as lithium ion battery negative pole active materials, conductive agent super-
P, binding agent PVDF, solvent NMP is configured to graphite cathode slurry.Then by cathode size be coated in drying on Copper Foil, rolling,
Cutting obtains stacked negative plate.
Battery makes：Charcoal positive plate, negative plate, barrier film (PE composite membranes) are applied into through lamination assembling, filling electrolyte in surface
The operation such as (the EC-EMC solution of 1.1mol/L LiPF6), cell activation, sorting prepare can fast charging and discharging lithium-ion electric
Pond.
The battery size of making is 1080120PL (thickness 10mm, width 80mm, length 120mm), nominal capacity
5000mAh.1C discharge capacities are 5105mAh to gained battery at room temperature, are that 1C is put with 30C multiplying power discharging capacity as 2598mAh
The 90.1% of capacitance.Electricity 4350mAh is filled with 6C electric current constant-current constant-voltage chargings 10min at room temperature, being filled with electricity is
85.2%.
Claims (10)
1. a kind of high multiplying power lithium ion battery positive pole；It is characterized in that：The high multiplying power lithium ion battery positive pole include collector,
Positive active material coating and carbon coating；The positive active material coating uniform is attached to collection liquid surface, and the charcoal is applied
Layer is uniform to be attached to positive active material coating surface, and the collector, positive active material coating, carbon coating constitute afflux
The high multiplying power lithium ion battery positive pole of body/positive active material coating/carbon coating.
2. a kind of high multiplying power lithium ion battery positive pole according to claim 1；It is characterized in that：Described carbon coating be containing
The coating of Graphene.
3. a kind of high multiplying power lithium ion battery positive pole according to claim 1；It is characterized in that：The charcoal of the graphene-containing
The thickness of coating is 1-5 μm.
4. a kind of high multiplying power lithium ion battery positive pole according to claim 2；It is characterized in that：The charcoal of the graphene-containing
Coating includes following components by percentage to the quality：
Stick knot 5-10%,
The 5%-50% of conductive agent 1,
The 45%-90% of conductive agent 2；
The conductive agent 1 is Graphene；The conductive agent 2 be selected from conductive carbon black, acetylene black, carbon fiber, CNT in extremely
Few one kind.
5. a kind of high multiplying power lithium ion battery positive pole according to claim 4；It is characterized in that：The bonding agent is poly- inclined
PVF.
6. a kind of preparation method of the high multiplying power lithium ion battery positive pole as described in claim 1-5 any one, it is characterised in that；
Comprise the steps：
The preparation of step one positive active material coating paste
In mass ratio, positive active material：Conductive agent：Kynoar=85-98：1-10：1-10, with taking positive electrode active material
Matter, conductive agent, Kynoar, will mix with the positive active material, conductive agent, Kynoar and the N-methyl pyrrolidones that take
Close uniform, obtain the positive active material coating paste that N-methyl pyrrolidones mass percentage concentration is 25%-60%；It is described just
Pole active material is selected from least one in cobalt acid lithium, nickle cobalt lithium manganate, LiFePO4, nickel cobalt lithium aluminate, LiMn2O4；It is described to lead
Electric agent is selected from least one in conductive carbon black, acetylene black, carbon fiber, CNT；
The preparation of step 2 carbon coating slurry
In mass ratio, conductive agent 1:Conductive agent 2:Stick knot=2-95：0-90：2-20, with taking binding agent, conductive agent 1, conductive agent
2, and obtain carbon coating slurry by being well mixed with binding agent, conductive agent 1, conductive agent 2 and the N-methyl pyrrolidones for taking；It is described
In carbon coating slurry, the mass percentage concentration of N-methyl pyrrolidones is 50%-70%；
Step 3 is coated
Positive active material coating paste is coated on collector, N-methyl pyrrole in positive active material coating paste is baked to
The content of pyrrolidone drops to 5wt%-8wt%, is coated with carbon coating slurry；Be baked to positive active material coating paste with
And after the N-methyl pyrrolidones in carbon coating slurry is removed completely, obtain the high multiplying power lithium ion battery positive pole.
7. the preparation method of a kind of high multiplying power lithium ion battery positive pole according to claim 6, it is characterised in that：Step 3
In, when preparing high multiplying power lithium ion battery positive pole, carried out by following stages；
Stage one applies one side
The tow sides of plus plate current-collecting body are respectively defined as A faces and B faces, positive active material coating paste is coated in positive pole
On the A faces of collector, baking, the content for being baked to N-methyl pyrrolidones in positive active material coating paste drops to
5wt%-8wt%, obtaining A faces has the collector of positive active material coating, then coats coating in positive active material coating
Carbon coating slurry, baking, the N-methyl pyrrolidones being baked in positive active material coating paste and carbon coating slurry is complete
Collector of the A faces with positive active material coating and carbon coating is obtained after full removing；
Stage two applies two-sided
Positive active material coating paste is coated on the B faces of plus plate current-collecting body, baking is baked to positive active material coating slurry
The content of N-methyl pyrrolidones drops to 5wt%-8wt% in material, then in positive active material coating coating carbon coating slurry
Material, baking, after the N-methyl pyrrolidones being baked in positive active material coating paste and carbon coating slurry is removed completely,
Obtain A faces and B faces and be coated with the high multiplying power lithium ion battery positive pole of positive active material coating and carbon coating.
8. the preparation method of a kind of high multiplying power lithium ion battery positive pole according to claim 6, it is characterised in that：The collection
Fluid is aluminium foil.
9. the application and preparation of a kind of high multiplying power lithium ion battery positive pole according to claim 1-5, it is characterised in that：Bag
Include is used for high multiplying power lithium ion battery by the high multiplying power lithium ion battery positive pole.
10. the application of a kind of high multiplying power lithium ion battery positive pole according to claim 9, it is characterised in that：The high power
The structure of rate lithium ion battery is lamination or multi pole ears winding-structure.
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| CN112467129A (en) * | 2020-11-02 | 2021-03-09 | 东莞市煜信恩能源科技有限公司 | Preparation method of conductive agent material capable of improving comprehensive performance of battery |
| CN112688022A (en) * | 2020-12-28 | 2021-04-20 | 安普瑞斯（无锡）有限公司 | Quick charge-discharge lithium ion battery and preparation method thereof |
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| CN114583105A (en) * | 2020-12-02 | 2022-06-03 | 北京卫蓝新能源科技有限公司 | Negative plate with heat dissipation structure, preparation method thereof and lithium ion battery |
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