CN103545533A - Lithium battery with high specific energy and preparation method for current collector of lithium battery - Google Patents
Lithium battery with high specific energy and preparation method for current collector of lithium battery Download PDFInfo
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- CN103545533A CN103545533A CN201310490065.4A CN201310490065A CN103545533A CN 103545533 A CN103545533 A CN 103545533A CN 201310490065 A CN201310490065 A CN 201310490065A CN 103545533 A CN103545533 A CN 103545533A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
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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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Abstract
The invention relates to a lithium battery with high specific energy and a preparation method for a current collector of the lithium battery. The lithium battery with the high specific energy is characterized by comprising a positive pole piece, a negative pole piece, a diaphragm and a current collector. The current collector is a carbon-coated aluminum net or a carbon-coated copper net which is prepared by adopting a magnetron sputtering method. The preparation method is simple, the specific surface area of the aluminum net or the copper net after being coated with carbon is high, the mechanical strength is high, the adhesiveness between the electrode sizing agents is strong, and power dropping phenomenon of the pole piece in the charging-discharging process of the battery is obviously reduced. In addition, a transitional layer is also arranged between a carbon layer and the metal net in the current collector in a coating manner, so that the bonding force between the carbon layer and the metal net can be greatly increased, and the safety of a single battery can be improved.
Description
Technical field
The collector preparation method who the present invention relates to a kind of lithium battery and lithium battery of high-energy-density, it is coated with thin carbon layer at collection liquid surface, belongs to technical field of lithium ion.
Background technology
In recent years, along with improving constantly of energy-saving and emission-reduction cry, carrying out of new-energy automobile is also more and more flourishing.New-energy automobile is different from traditional combustion engine car, and the research of carrying out this technology can realize " bend overtake other vehicles " of China aspect automotive engineering, in addition, carries out new-energy automobile research and also meets national industrial policy and developing direction.Battery is core and the soul of new-energy automobile, and it is determining the indices of new-energy automobile, only has the battery technology new-energy automobile technology that has been only real grasp of having grasped.And different types of battery also has pluses and minuses separately, range of application and application prospect are also different.In numerous batteries, lithium ion battery, owing to having outstanding cycle life, power density and fail safe etc., is considered to the most promising vehicle mounted dynamic battery.
But existing lithium battery, because energy density only can reach 150wh/kg, still can not meet the requirement of the long course continuation mileage of new-energy automobile, for this reason, must develop and there is the more lithium-ion-power cell of high-energy-density.Want to improve the energy density of battery cell, just must start with from material and two aspects of structure.Yet, according to existing lithium battery manufacturing technology, be difficult to make very large improvement in the configuration aspects of battery, therefore, we can only, by optimizing material, could further improve the energy density of battery.
Current collector material is in battery, to account for greater weight one class material, is generally Copper Foil (negative current collector) and aluminium foil (plus plate current-collecting body).The higher weight of these materials, has had a strong impact on the lifting of energy content of battery density.In recent years, copper mesh and the aluminium net with stronger mechanical strength are applied in lithium ion battery field by people, and have obtained certain achievement, and the energy density of monomer has had further increase.But, as the aluminium net of battery afflux liquid and copper mesh but because specific area is not high and with the reason such as anode and cathode slurry adhesion is inadequate, affected its use on lithium ion battery.
Summary of the invention
An object of the present invention is to provide a kind of lithium battery of high-energy-density, it has aluminium net or the copper mesh plated surface last layer carbon-coating of certain pore size structure, to improve the specific area of wire netting collector, increase wire netting mechanical strength and and electrode slurry between adhesiveness, reduce the anodal dry linting phenomenon in battery charge and discharge process;
Another object of the present invention is to provide a kind of preparation method of lithium battery collector of high-specific surface area, its process is easy, plating carbon-coating and aluminium net or copper mesh adhesion are high, aluminium net or copper mesh specific area after modification are large, large with anode sizing agent adhesion, can to improve battery cell fail safe is also coated with aluminium carbon transition zone between carbon-coating and aluminium net or copper mesh, improve widely the adhesion between carbon-coating and aluminium net or copper mesh, increased the possibility of its application.
To achieve these goals, technical scheme of the present invention is achieved in that a kind of lithium battery of high-energy-density, anode pole piece, cathode pole piece, barrier film and external packing aluminum plastic film, consists of; It is characterized in that: anode pole piece comprises positive electrode active materials, anodal binding agent, anodal conductive agent and plus plate current-collecting body, the mixture that wherein positive electrode active materials, anodal binding agent and anodal conductive agent three form is coated on anode collection surface uniformly, and in mixture, positive electrode active materials 85 ~ 95
wt.%, anodal binding agent accounts for 3 ~ 7
wt.% account for 2 ~ 6 with anodal conductive agent
wt.%; Cathode pole piece comprises negative active core-shell material, negative pole binding agent, cathode conductive agent and negative current collector, the mixture that wherein negative active core-shell material, negative pole binding agent and cathode conductive agent three form is coated on negative pole currect collecting surface uniformly, and in mixture, negative active core-shell material accounts for 87 ~ 93
wt.%, negative pole binding agent accounts for 5 ~ 8
wt.%, cathode conductive agent accounts for 2 ~ 5
wt.%; Barrier film is PP, PE barrier film or tri-layers of composite diaphragm of PP/PE/PP, and membrane thicknesses is 10 ~ 40 μ m.
Positive electrode active materials in described anode pole piece comprises the rich lithium material of LiMn2O4, nickel-cobalt-manganese ternary material and stratiform; Anodal binding agent comprises Kynoar, hydroxypropyl methylcellulose; Anodal conductive agent comprises acetylene black, carbon nano-fiber, carbon nano-tube; The painting carbon aluminium net of plus plate current-collecting body for preparing by magnetically controlled sputter method, being coated with carbon aluminium net thickness is 15 ~ 50 μ m; The painting carbon copper mesh of negative current collector for preparing by magnetically controlled sputter method, being coated with carbon copper mesh thickness is 10 ~ 35 μ m.
The preparation method of the collector of the lithium battery of described a kind of high-energy-density, concrete steps are as follows:
A) by aluminium net or copper mesh after organic solvent washing is removed surface and oil contaminant impurity, with compressed air, dry up, be held on vacuum vapor phase deposition instrument revolution work rest, system is evacuated to requirement of experiment scope;
B) arrive after requirement of experiment vacuum degree, pass into argon gas to certain air pressure, aluminium target or copper target and graphite target for cleaning experiment;
C) rotation revolution work rest is to aluminium target or copper target lining up on the target, through setting grid bias power supply duty ratio, frequency, voltage, aluminium target or copper target magnetic control sputtering power supply duty ratio, frequency, electric current, argon flow amount, after atmospheric pressure value, steadily increase within a certain period of time carbon-source gas flow to certain numerical value, aluminium net or copper mesh are carried out to Al-C or the spraying plating of Cu-C transition zone;
D) after transition zone spraying plating, rotation revolution work rest is to graphite target lining up on the target, through setting grid bias power supply duty ratio, frequency, voltage, graphite target magnetron sputtering power supply duty ratio, frequency, electric current, keep argon gas and carbon-source gas flow used constant, within a certain period of time aluminium net or copper mesh are carried out to carbon-coating spraying plating.
In described step a), organic solvent comprises ethanol, acetone, carrene and grease cleaning agent.
In described step a), aluminium net or copper mesh specification are 50 ~ 500 orders, and thickness is at 50 ~ 200 μ m, length 60cm, and width 15-30cm, aluminium net or copper mesh are parallel with magnetron sputtering target surface, and institute's compartment is apart from 8 ~ 15cm.
In described step a), requirement of experiment vacuum degree is for being less than 3.0 * 10
-3pa.
Described step b) air pressure adjustment scope is 3.0 * 10
-1-6.0 * 10
-1pa.
Described step c) grid bias power supply duty ratio 60% ~ 80%, frequency 60kHz ~ 80kHz, voltage 300V ~ 1000V, aluminium target or copper target magnetic control sputtering power supply duty ratio 60% ~ 80%, frequency 20kHz-40kHz, electric current 6A ~ 12A, argon flow amount 100sccm, air pressure 3.0 * 10
-1~ 6.0 * 10
-1pa, time 15min ~ 30min, methane upper limit 100sccm to 200sccm.
Described step d) grid bias power supply duty ratio 60% ~ 80%, frequency 60kHz ~ 80kHz, voltage 300V ~ 1000V.Graphite target control shielding power supply duty ratio 60% ~ 80%, frequency 20kHz ~ 40kHz, electric current 6A ~ 12A.Argon flow amount 100sccm, air pressure 3.0 * 10
-1~ 6.0 * 10
-1pa.The carbon-coating spraying plating time, methane passed into speed at 100sccm ~ 200sccm at 30min ~ 60min.
Good effect of the present invention is that its process is easy, plating carbon-coating and aluminium net or copper mesh adhesion are high, aluminium net or copper mesh specific area after modification are large, large with electrode slurry adhesion, can improve the fail safe of battery cell, between carbon-coating and aluminium net or copper mesh, be also coated with aluminium carbon transition zone, improved widely the adhesion between carbon-coating and aluminium net or copper mesh, increased the possibility of its application.
Accompanying drawing explanation
The structural representation of each unit of Fig. 1 energy-density lithium ion battery of the present invention, wherein " 1 " is the painting carbon aluminium net that adopts magnetron sputtering method to prepare, and " 2 " are cathode mixes, and " 3 " are barrier films, " 4 " are negative pole mixtures, and " 5 " are the painting carbon copper mesh that adopts magnetron sputtering method to prepare.
The overall structure schematic diagram of Fig. 2 energy-density lithium ion battery of the present invention, wherein " 6 " are aluminum plastic films.
The optics electromicroscopic photograph through magnetron sputtering method plating carbon moral aluminium net in Fig. 3 example 4 of the present invention.
Process magnetron sputtering method plating carbon moral aluminium net energy spectrogram in Fig. 4 example 7 of the present invention.
The copper mesh through magnetron sputtering method plating carbon in Fig. 5 example 8 of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
embodiment 1
To contain 90
wt.% LiMn2O4,6
wt.% Kynoar and 4
wt.% it is online that the mixture of acetylene black is coated on the 20 μ m painting carbon aluminium of preparing by magnetron sputtering method, as anode pole piece; To contain 90
wt.% Delanium, 5
wt.% Kynoar and 5
wt.% the mixture of acetylene black is coated on the 25 μ m painting carbon copper mesh of preparing by magnetron sputtering method, as cathode pole piece; PP single-layer septum, anode pole piece and cathode pole piece mode is as shown in Figure 1, 2 carried out stacked, by aluminum plastic film, pack, get final product to obtain high-energy-density lithium battery after injecting electrolyte.
embodiment 2
To contain 85
wt.% nickel-cobalt-manganese ternary material, 7
wt.% hydroxypropyl methylcellulose and 8
wt.% it is online that the mixture of carbon nano-fiber is coated on the 50 μ m painting carbon aluminium of preparing by magnetron sputtering method, as anode pole piece; To contain 93
wt.% lithium titanate, 5
wt.% hydroxypropyl methylcellulose and 2
wt.% the mixture of carbon nano-fiber is coated on the 10 μ m painting carbon copper mesh of preparing by magnetron sputtering method, as cathode pole piece; PE single-layer septum, anode pole piece and cathode pole piece mode is as shown in Figure 2 carried out stacked, by aluminum plastic film, pack, get final product to obtain high-energy-density lithium battery after injecting electrolyte.
embodiment 3
To contain 95
wt.% the rich lithium material, 3 of stratiform
wt.% Kynoar and 2
wt.% it is online that the mixture of carbon nano-tube is coated on the 15 μ m painting carbon aluminium of preparing by magnetron sputtering method, as anode pole piece; To contain 87
wt.% Si-C composite material, 8
wt.% Kynoar and 5
wt.% the mixture of carbon nano-tube is coated on the 35 μ m painting carbon copper mesh of preparing by magnetron sputtering method, as cathode pole piece; PP/PE/PP tri-layers of composite diaphragm, anode pole piece and cathode pole piece mode is as shown in Figure 2 carried out stacked, by aluminum plastic film, pack, get final product to obtain high-energy-density lithium battery after injecting electrolyte.
embodiment 4
Choosing specification is 50 orders, and the aluminium net of thickness 60 μ m is cut to after 60cm * 15cm through soaked in absolute ethyl alcohol ultrasonic clean surface and oil contaminant, with compressed air, dries up, and is held on vacuum vapor phase deposition instrument revolution work rest, apart from target surface 15cm.Open vacuum suction device system is evacuated to 9.0 * 10
-4pa.Pass into argon gas to 3.0 * 10
-1difference washing test aluminium target and graphite target after Pa.Rotation revolution work rest, to aluminium target lining up on the target, is set grid bias power supply duty ratio 60%, frequency 80kHz, voltage 500V; Aluminium target magnetic control sputtering power supply duty ratio 80%, frequency 40kHz, electric current 6A; Argon flow amount 100sccm rises to 100sccm by methane flow by 0sccm in 15min, and air pressure is 3.0 * 10
-1pa, carries out the spraying plating of Al-C transition zone.After transition zone spraying plating, rotation revolution work rest, to graphite target lining up on the target, is set grid bias power supply bias voltage 500V, duty ratio 60%, frequency 80kHz; Graphite target magnetron sputtering power supply duty ratio 80%, frequency 40kHz, electric current 12A; Argon flow amount 100sccm, methane flow 100sccm, air pressure 5.7 * 10
-1pa, after plated film time 30min, just obtains magnetron sputtering method and prepares plating carbon aluminium net collector for lithium ion battery, and Fig. 3 is the optical microscope photograph of this collector.
Choosing specification is 100 orders, and the aluminium net of thickness 50 μ m is cut to after 60cm * 20cm after carrene soaks ultrasonic clean surface and oil contaminant, with compressed air, dries up, and is held on vacuum vapor phase deposition instrument revolution work rest, apart from target surface 15cm.Open vacuum suction device system is evacuated to 3.0 * 10
-3pa.Pass into argon gas to 6.0 * 10
-1difference washing test aluminium target and graphite target after Pa.Rotation revolution work rest, to aluminium target lining up on the target, is set grid bias power supply duty ratio 60%, frequency 60kHz, voltage 300V; Aluminium target magnetic control sputtering power supply duty ratio 80%, frequency 40kHz, electric current 12A; Argon flow amount 100sccm rises to 200sccm by methane flow by 0sccm in 30min, and air pressure is 6.0 * 10
-1pa, carries out the spraying plating of Al-C transition zone.After transition zone spraying plating, rotation revolution work rest, to graphite target lining up on the target, is set grid bias power supply bias voltage 300V, duty ratio 60%, frequency 60kHz; Graphite target magnetron sputtering power supply duty ratio 80%, frequency 40kHz, electric current 12A; Argon flow amount 100sccm, methane flow 200sccm, air pressure 6.0 * 10
-1pa, just obtains magnetron sputtering method and prepares plating carbon aluminium net collector for lithium ion battery after plated film time 60min.
With the standby plating of magnetron sputtering plating legal system carbon aluminium net.Choosing specification is 500 orders, and the aluminium net of thickness 200 μ m is cut to after 60cm * 30cm after acetone soaks ultrasonic clean surface and oil contaminant, with compressed air, dries up, and is held on vacuum vapor phase deposition instrument revolution work rest, apart from target surface 8cm.Open vacuum suction device system is evacuated to 9.0 * 10
-4pa.Pass into argon gas to 3.0 * 10
-1difference washing test aluminium target and graphite target after Pa.Rotation revolution work rest, to aluminium target lining up on the target, is set grid bias power supply duty ratio 80%, frequency 80kHz, voltage 1000V; Aluminium target magnetic control sputtering power supply duty ratio 60%, frequency 20kHz, electric current 6A; Argon flow amount 100sccm rises to 120sccm by methane flow by 0sccm in 20min, air pressure range 3.0 * 10
-1pa ~ 5.4 * 10
-1pa carries out the spraying plating of Al-C transition zone.After transition zone spraying plating, rotation revolution work rest, to graphite target lining up on the target, is set grid bias power supply bias voltage 1000V, duty ratio 80%, frequency 80kHz; Graphite target magnetron sputtering power supply duty ratio 60%, frequency 20kHz, electric current 6A; Argon flow amount 100sccm, methane flow 120sccm, air pressure 3.0 * 10
-1pa, completes magnetron sputtering preparation method and prepares the preparation of plating carbon aluminium net and fluid for lithium ion battery after plated film time 30min.
embodiment 7
Choosing specification is 200 orders, and the aluminium net of thickness 100 μ m is cut to after 60cm * 20cm after grease cleaning agent ultrasonic clean surface and oil contaminant, with compressed air, dries up, and is held on vacuum vapor phase deposition instrument revolution work rest, apart from target surface 15cm.Open vacuum suction device system is evacuated to 9.0 * 10
-4pa.Pass into argon gas to 3.0 * 10
-1difference washing test aluminium target and graphite target after Pa.Rotation revolution work rest, to aluminium target lining up on the target, is set grid bias power supply duty ratio 80%, frequency 80kHz, voltage 800V; Aluminium target magnetic control sputtering power supply duty ratio 80%, frequency 40kHz, electric current 10A; Argon flow amount 100sccm rises to 200sccm by methane flow by 0sccm in 20min, air pressure range 3.0 * 10
-1pa ~ 6.0 * 10
-1pa carries out the spraying plating of Al-C transition zone.After transition zone spraying plating, rotation revolution work rest, to graphite target lining up on the target, is set grid bias power supply bias voltage 800V, duty ratio 80%, frequency 80kHz; Graphite target magnetron sputtering power supply duty ratio 80%, frequency 40kHz, electric current 10A; Argon flow amount 100sccm, methane flow 200sccm, air pressure 6.0 * 10
-1pa, completes the magnetron sputtering preparation of plating carbon aluminium net collector after plated film time 45min.Fig. 4 is the energy spectrogram of this plating carbon aluminium net collector, therefrom can clearly find out the existence of C layer,
embodiment 8
Choosing specification is 50 orders, and the copper mesh of thickness 60 μ m is cut to after 60cm * 15cm through soaked in absolute ethyl alcohol ultrasonic clean surface and oil contaminant, with compressed air, dries up, and is held on vacuum vapor phase deposition instrument revolution work rest, apart from target surface 15cm.Open vacuum suction device system is evacuated to 9.0 * 10
-4pa.Pass into argon gas to 3.0 * 10
-1difference washing test copper target and graphite target after Pa.Rotation revolution work rest, to copper target lining up on the target, is set grid bias power supply duty ratio 60%, frequency 80kHz, voltage 500V; Copper target magnetic control sputtering power supply duty ratio 80%, frequency 100kHz, electric current 6A; Argon flow amount 100sccm rises to 100sccm by methane flow by 0sccm in 15min, and air pressure is 3.0 * 10
-1pa, carries out the spraying plating of Cu-C transition zone.After transition zone spraying plating, rotation revolution work rest, to graphite target lining up on the target, is set grid bias power supply bias voltage 500V, duty ratio 60%, frequency 80kHz; Graphite target magnetron sputtering power supply duty ratio 80%, frequency 40kHz, electric current 12A; Argon flow amount 100sccm, methane flow 100sccm, air pressure 5.7 * 10
-1pa, after plated film time 30min, just obtains magnetron sputtering method and prepares plating carbon copper mesh collector for lithium ion battery, and Fig. 5 is the optical microscope photograph of this collector.
embodiment 9
Choosing specification is 100 orders, and the copper mesh of thickness 50 μ m is cut to after 60cm * 20cm after carrene soaks ultrasonic clean surface and oil contaminant, with compressed air, dries up, and is held on vacuum vapor phase deposition instrument revolution work rest, apart from target surface 15cm.Open vacuum suction device system is evacuated to 3.0 * 10
-3pa.Pass into argon gas to 6.0 * 10
-1difference washing test copper target and graphite target after Pa.Rotation revolution work rest, to copper target lining up on the target, is set grid bias power supply duty ratio 60%, frequency 60kHz, voltage 300V; Copper target magnetic control sputtering power supply duty ratio 80%, frequency 120kHz, electric current 12A; Argon flow amount 100sccm rises to 200sccm by methane flow by 0sccm in 30min, and air pressure is 6.0 * 10
-1pa, carries out the spraying plating of Cu-C transition zone.After transition zone spraying plating, rotation revolution work rest, to graphite target lining up on the target, is set grid bias power supply bias voltage 300V, duty ratio 60%, frequency 60kHz; Graphite target magnetron sputtering power supply duty ratio 80%, frequency 40kHz, electric current 12A; Argon flow amount 100sccm, methane flow 200sccm, air pressure 6.0 * 10
-1pa, just obtains magnetron sputtering method and prepares plating carbon copper mesh collector for lithium ion battery after plated film time 60min.
embodiment 10
Choosing specification is 500 orders, and the copper mesh of thickness 200 μ m is cut to after 60cm * 30cm after acetone soaks ultrasonic clean surface and oil contaminant, with compressed air, dries up, and is held on vacuum vapor phase deposition instrument revolution work rest, apart from target surface 8cm.Open vacuum suction device system is evacuated to 9.0 * 10
-4pa.Pass into argon gas to 3.0 * 10
-1difference washing test copper target and graphite target after Pa.Rotation revolution work rest, to copper target lining up on the target, is set grid bias power supply duty ratio 80%, frequency 80kHz, voltage 1000V; Copper target magnetic control sputtering power supply duty ratio 60%, frequency 100kHz, electric current 6A; Argon flow amount 100sccm rises to 120sccm by methane flow by 0sccm in 20min, air pressure range 3.0 * 10
-1pa ~ 5.4 * 10
-1pa carries out the spraying plating of Cu-C transition zone.After transition zone spraying plating, rotation revolution work rest, to graphite target lining up on the target, is set grid bias power supply bias voltage 1000V, duty ratio 80%, frequency 80kHz; Graphite target magnetron sputtering power supply duty ratio 60%, frequency 20kHz, electric current 6A; Argon flow amount 100sccm, methane flow 120sccm, air pressure 3.0 * 10
-1pa, completes magnetron sputtering preparation method and prepares the preparation of plating carbon copper mesh and fluid for lithium ion battery after plated film time 30min.
embodiment 11
Choosing specification is 200 orders, and the copper mesh of thickness 100 μ m is cut to after 60cm * 20cm after grease cleaning agent ultrasonic clean surface and oil contaminant, with compressed air, dries up, and is held on vacuum vapor phase deposition instrument revolution work rest, apart from target surface 15cm.Open vacuum suction device system is evacuated to 9.0 * 10
-4pa.Pass into argon gas to 3.0 * 10
-1difference washing test copper target and graphite target after Pa.Rotation revolution work rest, to copper target lining up on the target, is set grid bias power supply duty ratio 80%, frequency 80kHz, voltage 800V; Copper target magnetic control sputtering power supply duty ratio 80%, frequency 120kHz, electric current 10A; Argon flow amount 100sccm rises to 200sccm by methane flow by 0sccm in 20min, air pressure range 3.0 * 10
-1pa ~ 6.0 * 10
-1pa carries out the spraying plating of Cu-C transition zone.After transition zone spraying plating, rotation revolution work rest, to graphite target lining up on the target, is set grid bias power supply bias voltage 800V, duty ratio 80%, frequency 80kHz; Graphite target magnetron sputtering power supply duty ratio 80%, frequency 40kHz, electric current 10A; Argon flow amount 100sccm, methane flow 200sccm, air pressure 6.0 * 10
-1pa, completes magnetron sputtering preparation method and prepares the preparation of plating carbon copper mesh and fluid for lithium ion battery after plated film time 45min.
Claims (9)
1. a lithium battery for high-energy-density, is comprised of anode pole piece, cathode pole piece, barrier film and external packing aluminum plastic film; It is characterized in that: anode pole piece comprises positive electrode active materials, anodal binding agent, anodal conductive agent and plus plate current-collecting body, the mixture that wherein positive electrode active materials, anodal binding agent and anodal conductive agent three form is coated on anode collection surface uniformly, and in mixture, positive electrode active materials 85 ~ 95
wt.%, anodal binding agent accounts for 3 ~ 7
wt.% account for 2 ~ 6 with anodal conductive agent
wt.%; Cathode pole piece comprises negative active core-shell material, negative pole binding agent, cathode conductive agent and negative current collector, the mixture that wherein negative active core-shell material, negative pole binding agent and cathode conductive agent three form is coated on negative pole currect collecting surface uniformly, and in mixture, negative active core-shell material accounts for 87 ~ 93
wt.%, negative pole binding agent accounts for 5 ~ 8
wt.%, cathode conductive agent accounts for 2 ~ 5
wt.%; Barrier film is PP, PE barrier film or tri-layers of composite diaphragm of PP/PE/PP, and membrane thicknesses is 10 ~ 40 μ m.
2. a kind of lithium battery of high-energy-density according to claim 1, is characterized in that the positive electrode active materials in described anode pole piece comprises the rich lithium material of LiMn2O4, nickel-cobalt-manganese ternary material and stratiform; Anodal binding agent comprises Kynoar, hydroxypropyl methylcellulose; Anodal conductive agent comprises acetylene black, carbon nano-fiber, carbon nano-tube; The painting carbon aluminium net of plus plate current-collecting body for preparing by magnetically controlled sputter method, being coated with carbon aluminium net thickness is 15 ~ 50 μ m; The painting carbon copper mesh of negative current collector for preparing by magnetically controlled sputter method, being coated with carbon copper mesh thickness is 10 ~ 35 μ m.
3. a kind of lithium battery of high-energy-density according to claim 1, is characterized in that described lithium battery is as follows by the preparation method of high-specific surface area collector:
A) by aluminium net or copper mesh after organic solvent washing is removed surface and oil contaminant impurity, with compressed air, dry up, be held on vacuum vapor phase deposition instrument revolution work rest, system is evacuated to requirement of experiment scope;
B) arrive after requirement of experiment vacuum degree, pass into argon gas to certain air pressure, aluminium target or copper target and graphite target for cleaning experiment;
C) rotation revolution work rest is to aluminium target or copper target lining up on the target, through setting grid bias power supply duty ratio, frequency, voltage, aluminium target or copper target magnetic control sputtering power supply duty ratio, frequency, electric current, argon flow amount, after atmospheric pressure value, steadily increase within a certain period of time carbon-source gas flow to certain numerical value, aluminium net or copper mesh are carried out to Al-C or the spraying plating of Cu-C transition zone;
D) after transition zone spraying plating, rotation revolution work rest is to graphite target lining up on the target, through setting grid bias power supply duty ratio, frequency, voltage, graphite target magnetron sputtering power supply duty ratio, frequency, electric current, keep argon gas and carbon-source gas flow used constant, within a certain period of time aluminium net or copper mesh are carried out to carbon-coating spraying plating.
4. a kind of preparation method of collector of high-specific surface area according to claim 3, is characterized in that in described step a), organic solvent comprises ethanol, acetone, carrene and grease cleaning agent.
5. a kind of preparation method of collector of high-specific surface area according to claim 3, in step a) described in it is characterized in that, aluminium net or copper mesh specification are 50 ~ 500 orders, thickness is at 50 ~ 200 μ m, length 60cm, width 15-30cm, aluminium net or copper mesh are parallel with magnetron sputtering target surface, and institute's compartment is apart from 8 ~ 15cm.
6. a kind of preparation method of collector of high-specific surface area according to claim 3, is characterized in that in described step a) that requirement of experiment vacuum degree is for being less than 3.0 * 10
-3pa.
7. a kind of preparation method of collector of high-specific surface area according to claim 3, is characterized in that described step b) air pressure adjustment scope is 3.0 * 10
-1-6.0 * 10
-1pa.
8. a kind of preparation method of collector of high-specific surface area according to claim 3, it is characterized in that described step c) grid bias power supply duty ratio 60% ~ 80%, frequency 60kHz ~ 80kHz, voltage 300V ~ 1000V, aluminium target or copper target magnetic control sputtering power supply duty ratio 60% ~ 80%, frequency 20kHz-40kHz, electric current 6A ~ 12A, argon flow amount 100sccm, air pressure 3.0 * 10
-1~ 6.0 * 10
-1pa, time 15min ~ 30min, methane upper limit 100sccm to 200sccm.
9. a kind of preparation method of collector of high-specific surface area according to claim 3, is characterized in that described step d) grid bias power supply duty ratio 60% ~ 80%, frequency 60kHz ~ 80kHz, voltage 300V ~ 1000V; Graphite target control shielding power supply duty ratio 60% ~ 80%, frequency 20kHz ~ 40kHz, electric current 6A ~ 12A; Argon flow amount 100sccm, air pressure 3.0 * 10
-1~ 6.0 * 10
-1pa; The carbon-coating spraying plating time, methane passed into speed at 100sccm ~ 200sccm at 30min ~ 60min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310490065.4A CN103545533B (en) | 2013-10-18 | 2013-10-18 | The lithium battery of a kind of high-energy-density and the collector preparation method of lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310490065.4A CN103545533B (en) | 2013-10-18 | 2013-10-18 | The lithium battery of a kind of high-energy-density and the collector preparation method of lithium battery |
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| CN104701481B (en) * | 2014-12-23 | 2018-07-24 | 神工光电科技有限公司 | Lithium ion cell polar ear and preparation method thereof |
| WO2018170927A1 (en) * | 2017-03-24 | 2018-09-27 | 深圳先进技术研究院 | Integrated secondary cell, and manufacturing method thereof |
| CN109786755A (en) * | 2018-12-26 | 2019-05-21 | 中国电子科技集团公司第十八研究所 | Bipolar battery composite current collector structure and preparation method thereof |
| CN109921025A (en) * | 2019-03-12 | 2019-06-21 | 鑫土丰隆能源科技(苏州)有限公司 | A kind of power supply on vehicle system |
| CN110071291A (en) * | 2019-03-19 | 2019-07-30 | 长沙市秒冲电池技术与材料研究所 | Power battery, negative electrode tab, cathode composite foil and preparation method thereof |
| CN110752377A (en) * | 2019-12-04 | 2020-02-04 | 江西理工大学 | Battery current collector coated with graphite-like thin film, preparation method of battery current collector and prepared pole piece |
| CN111916671A (en) * | 2020-07-20 | 2020-11-10 | 陕西煤业化工技术研究院有限责任公司 | Lithium ion battery cathode, lithium ion battery and preparation method of lithium ion battery cathode |
| CN114864951A (en) * | 2022-03-04 | 2022-08-05 | 上海治臻新能源股份有限公司 | Composite current collector for lithium ion battery cathode and preparation method thereof |
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| CN104701481B (en) * | 2014-12-23 | 2018-07-24 | 神工光电科技有限公司 | Lithium ion cell polar ear and preparation method thereof |
| WO2018170927A1 (en) * | 2017-03-24 | 2018-09-27 | 深圳先进技术研究院 | Integrated secondary cell, and manufacturing method thereof |
| CN109786755A (en) * | 2018-12-26 | 2019-05-21 | 中国电子科技集团公司第十八研究所 | Bipolar battery composite current collector structure and preparation method thereof |
| CN109921025A (en) * | 2019-03-12 | 2019-06-21 | 鑫土丰隆能源科技(苏州)有限公司 | A kind of power supply on vehicle system |
| CN110071291A (en) * | 2019-03-19 | 2019-07-30 | 长沙市秒冲电池技术与材料研究所 | Power battery, negative electrode tab, cathode composite foil and preparation method thereof |
| CN110752377A (en) * | 2019-12-04 | 2020-02-04 | 江西理工大学 | Battery current collector coated with graphite-like thin film, preparation method of battery current collector and prepared pole piece |
| CN111916671A (en) * | 2020-07-20 | 2020-11-10 | 陕西煤业化工技术研究院有限责任公司 | Lithium ion battery cathode, lithium ion battery and preparation method of lithium ion battery cathode |
| CN114864951A (en) * | 2022-03-04 | 2022-08-05 | 上海治臻新能源股份有限公司 | Composite current collector for lithium ion battery cathode and preparation method thereof |
| CN114864951B (en) * | 2022-03-04 | 2024-01-19 | 苏州臻锂新材科技有限公司 | Composite current collector for lithium ion battery cathode and preparation method thereof |
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