CN101409369A - Large-capacity high power polymer ferric lithium phosphate power cell and preparation method thereof - Google Patents
Large-capacity high power polymer ferric lithium phosphate power cell and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a large-capacity high-power polymer lithium iron phosphate power battery. The weight ratio of anode slurry is as follows: 81 to 85 percent of lithium iron phosphate, 1 to 5.5 percent of superconduction carbon, 0 to 2.5 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 0 to 2.5 percent of crystalline flake graphite, 0 to 2 percent of carbon nanometer tube as well as 6 to 7.5 percent of polyvinylidene fluoride; the weight ratio of cathode slurry is as follows: 89 to 91 percent of cathode material, 1 to 3.5 percent of superconduction carbon, 0 to 2 percent of conductive carbon soot, 0 to 4 percent of conductive black lead, 2.5 to 3.5 percent of styrene-butadiene rubber as well as 1.5 to 2 percent of sodium carboxymethyl cellulose; the steps for preparing the battery are as follows: preparing slurry, coating the anode and the cathode, rolling and pressing a polar plate, transversely and separately cutting the polar plate, baking the polar plate, welding the polar ears of the anode and the cathode, preparing a battery cell, putting the electric core into a shell and sealing, baking the electric core, injecting liquid into the battery as well as forming the battery and dividing the volume of the battery. The invention relates to a lithium-ion secondary battery which can provide drive energies for electric tools, electric bicycles, motor cars and electric vehicles.
Description
Technical field
The present invention relates to a kind of battery and preparation method thereof, particularly relate to a kind of large-capacity high power polymer ferric lithium phosphate power cell and preparation method thereof.
Background technology
In petroleum resources day by day shortage, environmental pollution serious day by day today, the harmonious development of the energy, resource, environment and human society becomes the focus of social concerns day by day, seek to develop traditional fossil energy alternative energy source, realize harmless resource industries development, the harmony of seeking human and environment seems particularly urgent.In modern society, people are more and more strong to the demand of big capacity, high-power battery, particularly the requirement that is used for electric tool, electric bicycle, motorcycle, car power source and stand-by power supply battery improved constantly.The electrokinetic cell that uses is mainly lead-acid power accumulator, Ni-MH battery, nickel-cadmium cell at present.Lead in the lead-acid battery, the cadmium in the nickel-cadmium cell all can pollute environment from exploiting, smelt the blowdown of producing.Discard the back if deal with improperly at it in addition, will cause secondary pollution environment.So the lithium ion anode material electrokinetic cell of environmentally safe seems particularly important.
Lithium ion polymer battery in the market is based on the conventional type low capacity, and positive electrode mainly uses cobalt acid lithium material.But the high temperature safety and the overcharging resisting performance of cobalt acid lithium material are relatively poor, so can not be as the positive electrode of large-capacity high power polymer lithium-ion-power cell.In addition, preparation large-capacity high-power power polymer lithium ion battery, if use conventional takeup type structure, its battery pole piece is inevitable very long, bring very big difficulty to film-making, and pole piece is impaired easily, not only can influence the battery capacity performance, and can cause the fail safe of battery to reduce, the internal resistance of cell is higher in addition, the high-rate battery discharge poor-performing; If employing laminated structure, though can make full use of the inner space of battery, improve the energy density of battery, reduce the internal resistance of battery, improve the heavy-current discharge performance of lithium rechargeable battery, but battery is operated in preparation process and is not easy to carry out, battery consistency is relatively poor, finished product and production efficiency are lower, because the extruding that expansion caused of battery positive and negative plate in charging process causes burrs on edges that positive and negative plate exists or the edge dressing that comes off to puncture barrier film and battery short circuit takes place, cause that the fail safe of battery reduces in addition in the process of cutting.Therefore, up to the present, preparation large-capacity high power polymer lithium-ion-power cell is made slow progress.
LiFePO4 has the specific energy height, has extended cycle life, Stability Analysis of Structures, security performance are good, with low cost, do not have any poisonous and harmful substance, can not be to characteristics such as any pollutions of environment structure, it is the positive electrode that preparation large-capacity high-power electrokinetic cell has development potentiality most, but LiFePO4 processing difficulties, in preparation slurry process, absorb water easily, cause the coating difficulty.Along with the development and the progress of science and technology of society, lithium ion polymer battery is also constantly updating, and people wish that urgently a kind of large-capacity high power polymer ferric lithium phosphate power cell and preparation method thereof comes out.
Summary of the invention
Technical problem to be solved by this invention is, overcome the defective that above-mentioned prior art exists, by improving the preparation process condition of anode sizing agent, solve iron phosphate lithium positive pole pulp preparation and coating difficulty, adopt plural electric core to carry out superimposed frame mode, for the large-capacity high power polymer lithium-ion-power cell provides a kind of preparation method, produce a kind of large-capacity high power polymer lithium-ion-power cell by this method, make this battery be used for electric tool, electric bicycle, motorcycle, car power source and stand-by power supply battery better.
The technical solution adopted for the present invention to solve the technical problems is: large-capacity high power polymer ferric lithium phosphate power cell, comprise positive pole, negative pole, barrier film, polymer gel electrolyte, battery container, wherein positive pole is made up of positive active material, binding agent, conductive agent and plus plate current-collecting body, positive active material adopts LiFePO4, binding agent adopts Kynoar, conductive agent adopts one or more in conductive black, superconduction carbon, electrically conductive graphite, crystalline flake graphite, the carbon nano-tube, and plus plate current-collecting body adopts aluminium foil; Negative pole is made up of negative material, conductive agent, thickener, binding agent and negative current collector, conductive agent adopts one or more in conductive carbon black, superconduction carbon, the electrically conductive graphite, thickener adopts sodium carboxymethylcellulose, binding agent adopts butadiene-styrene rubber, negative current collector adopts Copper Foil, adopt plural electric core, be made into laminated structure, it is characterized in that:
Material and percentage by weight proportioning thereof that anode sizing agent adopts are:
LiFePO4 81%～85%
Conductive black 0%～2.5%
Electrically conductive graphite 0%～4%
Crystalline flake graphite 0%～2.5%
Carbon nano-tube 0%～2%
Kynoar 6%～7.5%;
Material and percentage by weight proportioning thereof that cathode size adopts are:
Negative material 89%～91%
Conductive black 0%～2%
Electrically conductive graphite 0%～4%
Butadiene-styrene rubber 2.5%～3.5%
Sodium carboxymethylcellulose 1.5%～2%.
In technique scheme, described negative material adopts one or more in Delanium, native graphite, carbonaceous mesophase spherules or the hard carbon material.
Battery container is formed towards box by aluminum plastic film, and battery battery core is the superimposed electric core that two electric cores are superimposed together and form.
The preparation method of large-capacity high power polymer ferric lithium phosphate power cell is characterized in that: may further comprise the steps:
(1) preparation of slurry: with the N-methyl pyrrolidone is solvent configuration anode sizing agent, the material and the percentage by weight proportioning thereof that adopt are: LiFePO4 81%～85%, superconduction carbon 1%～5.5%, conductive black 0%～2.5%, electrically conductive graphite 0%～4%, crystalline flake graphite 0%～2.5%, carbon nano-tube 0%～2%, Kynoar 6%～7.5%; Before the slurry configuration, LiFePO4 and conductive agent all need 80～120 ℃ of bakings 8～16 hours, and conductive agent adopts one or more in conductive black, superconduction carbon, electrically conductive graphite, crystalline flake graphite, the carbon nano-tube; Solid content of slurry is 35～45%, at first Kynoar is added in the N-methyl pyrrolidone according to slurry solid content and proportioning thereof, under the condition that the recirculated water cooling is arranged, carried out vacuum stirring 2～4 hours, add the LiFePO4 mix and the mixture of conductive agent then in batches, mixture divides 3 addings, added once every 1 hour, add material for the last time and stirred 3～5 hours; The slurry that obtains is crossed 150 mesh sieves 2～3 times;
With the deionized water is that medium prepares cathode size, the material and the percentage by weight proportioning thereof that adopt are: negative material 89%～91%, superconduction carbon 1%～3.5%, conductive black 0%～2%, electrically conductive graphite 0%～4%, butadiene-styrene rubber 2.5%～3.5%, sodium carboxymethylcellulose 1.5%～2%; Negative material adopts one or more in Delanium, native graphite, carbonaceous mesophase spherules or the hard carbon material, the solid content of cathode size is 30～50%, at first sodium carboxymethylcellulose was added deionized water for stirring 1～3 hour according to slurry solid content and proportioning thereof, adding conductive agent subsequently stirred 2～4 hours, slurry is crossed colloid mill so that conductive agent is disperseed fully, adding negative material again stirred 2～5 hours, add butadiene-styrene rubber subsequently and stirred 2～3 hours, the slurry that obtains is crossed 150 mesh sieves 2～3 times;
(2) both positive and negative polarity coating: the coating of roll-in clearance-type is adopted in coating, reserves the lug position according to the pole piece designing requirement, and anode sizing agent coating used thickness is the aluminium foil of 16～30 μ m, and coated face density is 6～16mg/cm
2, anodal coating baking box baking temperature is 90～120 ℃, anodal coating speed is controlled at 1.5～2 meters of per minutes; It is the electrolytic copper foil of 10～20 μ m that the negative pole currect collecting body thickness is used in the cathode size coating, and coated face density is 2.5～7mg/cm
2, negative pole coating baking box baking temperature is 80～100 ℃; The negative pole coating speed can be 3～5 meters of per minutes;
(3) pole piece roll-in: anodal compacted density is 1.5～2.5g/cm
3, the negative pole compacted density is 1.2～1.6g/cm
3
(4) pole piece crosscut and cutting: the good pole piece of roll-in is carried out crosscut and cut according to the manufacturing specification of battery pole piece;
(5) pole piece baking: pole piece toasts under vacuum state, anode pole piece toasted 12 hours under 110～130 ℃ of temperature, cathode pole piece is 80～100 ℃ in temperature and toasted 12 hours down, in the bake process every 4 hours continuous extraction argon gas 3 times, baking is carried out the extraction argon gas 3 times after finishing again continuously, under vacuum state, below the cooling pole piece to 40 ℃, take out pole piece and carry out subsequent handling then;
(6) both positive and negative polarity lug welding: require the both positive and negative polarity lug is welded on the both positive and negative polarity pole piece according to battery design, ultrasonic bond is all adopted in the welding of both positive and negative polarity lug, avoid the lug rosin joint;
(7) preparation of battery: electric core comprises the barrier film between positive pole, negative pole and the both positive and negative polarity, the electricity core adopts barrier film/negative pole/barrier film/anodal winding-structure, it is the barrier film of 12 μ m～30 μ m that described barrier film adopts thickness, two electric cores is superimposed together forms superimposed electric core;
(8) electric core go into shell and encapsulation: superimposed electric core being packed into dash in the good battery container, is 150～250 ℃ in temperature, and pressure is 0.2～0.5MPa, and the time is with sealing machine heat-sealing battery top and a side wherein under 5～10 seconds conditions;
(9) electric core baking: the electric core of baking is 24 hours under 80～120 ℃ of vacuum states, in the bake process every 6 hours continuous extraction argon gas 3 times, carry out 3 argon gas of extraction more continuously after baking finishes, under vacuum state, below the cooling pole piece to 40 ℃, take out electric core and carry out the fluid injection operation then;
(10) battery liquid-filling: in the battery of electric core is housed, inject gel electrolyte, seal another side of battery then, gel electrolyte adopts 60～120 ℃ of temperature, pressure 0.5Kpa～2.5Mpa, 2～30 minutes time to carry out the mode polymerization that heat causes, shelve battery subsequently 24 hours, and welded two positive pole ears and negative lug respectively with aluminium strip and nickel strap before battery changes into;
(11) battery changes into and partial volume: adopt to change in limited time, chemical synthesis technology is 4 hours+0.2C of 0.05C charging 1 hour+0.1C charging charging 3 hours, then battery is carried out degasification, heat-sealing, cutting edge, shaping; Battery partial volume technology is charged to 4V for the 0.5C constant current, constant-current constant-voltage charging under 4V again, cut-off current is 0.01C, discharge into 2.5V with 0.5C then, the capacity that this moment, battery was emitted is a battery capacity, again battery is charged to 3.6V with the 0.5C constant current subsequently, again constant-current constant-voltage charging under 3.6V, cut-off current is 0.01C, if various chemical property indexs reach requirement and just can put in storage battery behind the battery partial volume.
The invention has the beneficial effects as follows: utilize LiFePO4 to make the positive electrode of battery, its have have extended cycle life, Stability Analysis of Structures, security performance are good, with low cost, do not have any poisonous and harmful substance, can not be to characteristics such as any pollutions of environment structure; But utilized polymer battery to have advantages such as thin typeization, arbitrary areaization and arbitrary shapeization; With plastic-aluminum combined thin film fabrication battery case, can not produce safety issues such as leakage, burning, blast; Utilized gel electrolyte polymer battery high security, the fail safe of battery has been shown improve; Utilize slurry under the vacuum circulated water state of cooling, to stir, solved the preparation and the coating difficulty of slurry effectively; Utilized unique two electric core or how electric core iterative structure that battery capacity is done greatly easily, the internal resistance of cell reduces, and high rate capability improves; The present invention has solved the problem of large-capacity high-power lithium ionomer cell preparation difficulty effectively, thus for prepare big capacity, the high power polymer lithium-ion-power cell provides method preferably.The present invention is as a kind of lithium-ion-power cell and preparation method thereof, and its battery capacity is big, power is high, and the preparation method is simple, easy to operate.
Description of drawings
Fig. 1 is a front view of the present invention;
Fig. 2 is the front view of monomer A electricity core of the present invention;
Fig. 3 is the front view of monomers B electricity core of the present invention;
Fig. 4 is the front view of the superimposed electric core of monomer A electricity core of the present invention and the superimposed back of monomers B electricity core;
Fig. 5 is the vertical view of the superimposed electric core of monomer A electricity core of the present invention and the superimposed back of monomers B electricity core.
Among the figure, 1, battery container; 2, A electricity core; 21, A positive pole; 22, A negative pole; 3, B electricity core; 31, B positive pole; 32, B negative pole; 4, superimposed electric core.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Large-capacity high power polymer ferric lithium phosphate power cell is made up of battery battery core, gel electrolyte and battery container 1; Battery battery core is made up of positive pole, negative pole and barrier film.
Anodal make anode sizing agent by LiFePO4, conductive agent, binding agent according to the constant weight ratio and be coated on the aluminum foil current collector and make; Wherein LiFePO4 is a positive active material, conductive agent adopts one or more in conductive black, Super-P (superconduction carbon), electrically conductive graphite, S-O (crystalline flake graphite), the carbon nano-tube, wherein, electrically conductive graphite is KS-6 (electrically conductive graphite) and/or KS-15 (electrically conductive graphite); Binding agent adopts Kynoar (PVDF); Plus plate current-collecting body adopts aluminium foil.
Material and percentage by weight proportioning thereof that anode sizing agent adopts are:
LiFePO4 81%
Superconduction carbon (Super-P) 5%
Conductive black 2.5%
Crystalline flake graphite (S-O) 2.5%
Carbon nano-tube 1.5%
Kynoar 7.5%
Anodal coated face density 10mg/cm
2
Anodal compacted density 1.90g/cm
3
Negative pole is made cathode size by negative material, conductive agent, binding agent, thickener according to the constant weight ratio and is coated on the Copper Foil collector and makes; In negative material employing Delanium, native graphite, MCMB (carbonaceous mesophase spherules) and the hard carbon material any one or multiple, in conductive agent selection conductive carbon black, Super-P (superconduction carbon), the electrically conductive graphite any one or multiple, wherein electrically conductive graphite is SFG-6 (electrically conductive graphite) and/or KS-15 (electrically conductive graphite); Binding agent adopts butadiene-styrene rubber (SBR), and thickener adopts sodium carboxymethylcellulose (CMC), and negative current collector adopts Copper Foil.
Material and percentage by weight proportioning thereof that cathode size adopts are:
Negative material 89%
Superconduction carbon (Super-P) 3.5%
Electrically conductive graphite (SFG-6) 2%
Butadiene-styrene rubber (SBR) 3.5%
Sodium carboxymethylcellulose (CMC) 2%
Negative pole coated face density 4mg/cm
2
Negative pole compacted density 1.40g/cm
3
The preparation method of large-capacity high power polymer ferric lithium phosphate power cell is characterized in that: may further comprise the steps:
(1) preparation of slurry: with N-methyl pyrrolidone (NMP) solvent configuration anode sizing agent, the material of employing and percentage by weight proportioning thereof are: LiFePO4 81%, conductive agent superconduction carbon (Super-P) 5%, conductive black 2.5%, crystalline flake graphite (S-O) 2.5%, carbon nano-tube 1.5%, binding agent Kynoar 7.5%; Before the slurry configuration, LiFePO4 and conductive agent all need 80～120 ℃ of bakings 8～16 hours, to remove the moisture in the raw material; Solid content of slurry is 35～45%.At first Kynoar is added in the N-methyl pyrrolidone according to slurry solid content and proportioning thereof, under the condition that the recirculated water cooling is arranged, carried out vacuum stirring 2～4 hours, add the LiFePO4 mix and the mixture of conductive agent then in batches, mixture divides 3 addings, added once every 1 hour, add material for the last time and stirred 3～5 hours; In reinforced process, to reduce the slurry suction as far as possible; The slurry that obtains is crossed 150 mesh sieves 2～3 times, to remove particle bigger in the slurry.
With the deionized water is that medium prepares cathode size, and the material of employing and percentage by weight proportioning thereof are: negative material 89%, conductive agent superconduction carbon (Super-P) 3.5%, electrically conductive graphite (SFG-6) 2%, binding agent butadiene-styrene rubber (SBR) 3.5%, thickener sodium carboxymethylcellulose (CMC) 2%; The solid content 30～50% of cathode size, at first sodium carboxymethylcellulose (CMC) was added deionized water for stirring 1～3 hour according to slurry solid content and proportioning thereof, adding conductive agent subsequently stirred 2～4 hours, slurry is crossed colloid mill so that conductive agent is disperseed fully, add negative material again and stirred 2～5 hours, add butadiene-styrene rubber (SBR) subsequently and stirred 2～3 hours; The slurry that obtains is crossed 150 mesh sieves 2～3 times, to remove particle bigger in the slurry.
(2) both positive and negative polarity coating: according to the requirement of battery pole piece surface density, the negative or positive electrode slurry evenly is coated in the negative or positive electrode collector, the coating of roll-in clearance-type is adopted in coating, reserve the lug position according to the pole piece designing requirement, anode sizing agent coating used thickness is the aluminium foil of 16～30 μ m, and anodal coated face density is 10mg/cm
2,,, anodal coating baking temperature is 90～120 ℃; It is the electrolytic copper foil of 10～20 μ m that the negative pole currect collecting body thickness is used in the cathode size coating, and negative pole coated face density is 4mg/cm
2, negative pole coating baking box baking temperature is 80～100 ℃; To determine coated face density by the examination coating during coating, note during coating that cut can not be arranged, leak the foil phenomenon, will control horizontal and vertical coating homogeneity simultaneously; Because the anode sizing agent solid content is lower, so coating speed is controlled at 1.5～2 meters of per minutes, the negative pole coating speed can be 3～5 meters of per minutes.
(3) pole piece roll-in: make requirement according to both positive and negative polarity and respectively both positive and negative polarity is carried out roll-in, anodal compacted density is 1.9g/cm
3, the negative pole compacted density is 1.3g/cm
3, note the consistency that pole piece is horizontal and vertical during compressing tablet.
(4) pole piece crosscut and cutting: the good pole piece of roll-in is carried out crosscut and cut according to the manufacturing specification of battery pole piece; To note accurately reserving the lug position during crosscut, will avoid the pole piece burr phenomena as far as possible simultaneously, cause battery short circuit in case burr punctures barrier film.
(5) pole piece baking: pole piece toasts under vacuum state, anode pole piece toasted 12 hours under 110～130 ℃ of temperature, cathode pole piece is 80～100 ℃ in temperature and toasted 12 hours down, in bake process every 4 hours continuous extraction argon gas 3 times, can remove on the one hand in the baking box solvent and the moisture that toast out in the pole piece, can keep the baking box inner drying on the other hand, pole piece toasts more fully; Carry out the extraction argon gas continuously 3 times again after baking finishes, under vacuum state, below the cooling pole piece to 40 ℃, take out pole piece and carry out subsequent handling then.
(6) both positive and negative polarity lug welding: require the both positive and negative polarity lug is welded on the both positive and negative polarity pole piece according to battery design, ultrasonic bond is all adopted in the welding of both positive and negative polarity lug, avoid the lug rosin joint.
(7) preparation of battery: as Fig. 1, Fig. 2, shown in Figure 3, the described large-capacity high power polymer ferric lithium phosphate power cell of present embodiment comprises battery container 1, A electricity core 2, B electricity core 3 and gel electrolyte, A electricity core 2 comprises the barrier film between A positive pole 21, A negative pole 22 and the both positive and negative polarity, A electricity core 2 and B electricity core 3 adopt (barrier film/negative pole/barrier film/positive pole) winding-structure, and it is 12 μ m～30 μ m (polyethylene-polypropylene-polyethylene) barrier films that described barrier film adopts thickness.B electricity core 3 comprises B positive pole 31, the barrier film between B negative pole 32 and the both positive and negative polarity; As shown in Figure 4, A electricity core 2 and B electricity core 3 be superimposed together form superimposed electric core 4, Fig. 5 is the vertical view of superimposed electric core 4.
(8) electric core go into shell and encapsulation: superimposed electric core 4 being packed into dash in the good battery container 1, is 150～250 ℃ in temperature, and pressure is 0.2～0.5MPa, and the time is with sealing machine heat-sealing battery top and a side wherein under 5～10 seconds conditions.
(9) electric core baking: the electric core of baking is 24 hours under 80～120 ℃ of vacuum states, in bake process, continuous extraction argon gas was 3 times every 6 hours, can remove in the baking box solvent and the moisture that toast out in the pole piece, can keep the baking box inner drying in addition, make the baking of battery more abundant, baking is carried out 3 argon gas of extraction after finishing again continuously, under vacuum state below the cooling pole piece to 40 ℃, can take out electric core and carry out the fluid injection operation this moment then.
(10) battery liquid-filling: in the battery of electric core is housed, inject gel electrolyte, seal another side of battery then, to keep the side airbag during heat-sealing,, can not cause the battery swell and cause battery leakage so that the gas that battery produces in formation process can rest in the airbag; Gel electrolyte adopts 60～120 ℃, pressure 0.5Kpa～2.5MPa, and 2～30 minutes time was carried out the mode polymerization that heat causes; Shelved battery subsequently 24 hours; Before changing into, battery welds two positive pole ears and negative lug respectively with aluminium strip and nickel strap.
(11) battery changes into and partial volume: chemical synthesis technology has significant effects to battery performance, the particularly formation of anticathode surface solid electrolyte film, so generally use little electric current to change into, the present embodiment chemical synthesis technology adopts and changes in limited time, and chemical synthesis technology is 4 hours+0.2C of 0.05C charging 1 hour+0.1C charging charging 3 hours; Then battery is carried out degasification, heat-sealing, cutting edge and carries out shaping; Battery partial volume technology is charged to 4V for the 0.5C constant current, constant-current constant-voltage charging under 4V again, and cut-off current is 0.01C, discharges into 2.5V with 0.5C then, the capacity that this moment, battery was emitted is a battery capacity; Again battery is charged to 3.6V with 0.5C stream perseverance subsequently, constant-current constant-voltage charging under 3.6V again, cut-off current is 0.01C; If various chemical property indexs reach requirement and just can put in storage battery behind the battery partial volume.
The above only is three embodiment of the present invention; should be understood that; for the person of ordinary skill of the art; under the prerequisite that does not break away from principle of the present invention; can also make some improvement to the present invention; so all equivalences that the preparation method did according to the described composition of patent claim of the present invention, structure and product change or modify, and belong to the scope of patent application protection of the present invention equally.
Claims (4)
1, large-capacity high power polymer ferric lithium phosphate power cell, comprise positive pole, negative pole, barrier film, polymer gel electrolyte, battery container, wherein positive pole is made up of positive active material, binding agent, conductive agent and plus plate current-collecting body, positive active material adopts LiFePO4, binding agent adopts Kynoar, conductive agent adopts one or more in conductive black, superconduction carbon, electrically conductive graphite, crystalline flake graphite, the carbon nano-tube, and plus plate current-collecting body adopts aluminium foil; Negative pole is made up of negative material, conductive agent, thickener, binding agent and negative current collector, conductive agent adopts one or more in conductive carbon black, superconduction carbon, the electrically conductive graphite, thickener adopts sodium carboxymethylcellulose, binding agent adopts butadiene-styrene rubber, negative current collector adopts Copper Foil, adopt plural electric core, be made into laminated structure, it is characterized in that:
Material and percentage by weight proportioning thereof that anode sizing agent adopts are:
LiFePO4 81%～85%
Superconduction carbon 1%～5.5%
Conductive black 0%～2.5%
Electrically conductive graphite 0%～4%
Crystalline flake graphite 0%～2.5%
Carbon nano-tube 0%～2%
Kynoar 6%～7.5%;
Material and percentage by weight proportioning thereof that cathode size adopts are:
Negative material 89%～91%
Superconduction carbon 1%～3.5%
Conductive black 0%～2%
Electrically conductive graphite 0%～4%
Butadiene-styrene rubber 2.5%～3.5%
Sodium carboxymethylcellulose 1.5%～2%.
2, large-capacity high power polymer ferric lithium phosphate power cell according to claim 1 is characterized in that: described negative material adopts one or more in Delanium, native graphite, carbonaceous mesophase spherules or the hard carbon material.
3, large-capacity high power polymer ferric lithium phosphate power cell according to claim 1, it is characterized in that: battery container is formed towards box by aluminum plastic film, and battery battery core is the superimposed electric core that two electric cores are superimposed together and form.
4, the preparation method of large-capacity high power polymer ferric lithium phosphate power cell is characterized in that: may further comprise the steps:
(1) preparation of slurry: with the N-methyl pyrrolidone is solvent configuration anode sizing agent, the material and the percentage by weight proportioning thereof that adopt are: LiFePO4 81%～85%, superconduction carbon 1%～5.5%, conductive black 0%～2.5%, electrically conductive graphite 0%～4%, crystalline flake graphite 0%～2.5%, carbon nano-tube 0%～2%, Kynoar 6%～7.5%; Before the slurry configuration, LiFePO4 and conductive agent all need 80～120 ℃ of bakings 8～16 hours, and conductive agent adopts one or more in conductive black, superconduction carbon, electrically conductive graphite, crystalline flake graphite, the carbon nano-tube; Solid content of slurry is 35～45%, at first Kynoar is added in the N-methyl pyrrolidone according to slurry solid content and proportioning thereof, under the condition that the recirculated water cooling is arranged, carried out vacuum stirring 2～4 hours, add the LiFePO4 mix and the mixture of conductive agent then in batches, mixture divides 3 addings, added once every 1 hour, add material for the last time and stirred 3～5 hours; The slurry that obtains is crossed 150 mesh sieves 2～3 times;
With the deionized water is that medium prepares cathode size, the material and the percentage by weight proportioning thereof that adopt are: negative material 89%～91%, superconduction carbon 1%～3.5%, conductive black 0%～2%, electrically conductive graphite 0%～4%, butadiene-styrene rubber 2.5%～3.5%, sodium carboxymethylcellulose 1.5%～2%; Negative material adopts one or more in Delanium, native graphite, carbonaceous mesophase spherules or the hard carbon material, the solid content of cathode size is 30～50%, at first sodium carboxymethylcellulose was added deionized water for stirring 1～3 hour according to slurry solid content and proportioning thereof, adding conductive agent subsequently stirred 2～4 hours, slurry is crossed colloid mill so that conductive agent is disperseed fully, adding negative material again stirred 2～5 hours, add butadiene-styrene rubber subsequently and stirred 2～3 hours, the slurry that obtains is crossed 150 mesh sieves 2～3 times;
(2) both positive and negative polarity coating: the coating of roll-in clearance-type is adopted in coating, reserves the lug position according to the pole piece designing requirement, and anode sizing agent coating used thickness is the aluminium foil of 16～30 μ m, and coated face density is 6～16mg/cm
2, anodal coating baking box baking temperature is 90～120 ℃, anodal coating speed is controlled at 1.5～2 meters of per minutes; It is the electrolytic copper foil of 10～20 μ m that the negative pole currect collecting body thickness is used in the cathode size coating, and coated face density is 2.5～7mg/cm
2, negative pole coating baking box baking temperature is 80～100 ℃; The negative pole coating speed can be 3～5 meters of per minutes;
(3) pole piece roll-in: anodal compacted density is 1.5～2.5g/cm
3, the negative pole compacted density is 1.2～1.6g/cm
3
(4) pole piece crosscut and cutting: the good pole piece of roll-in is carried out crosscut and cut according to the manufacturing specification of battery pole piece;
(5) pole piece baking: pole piece toasts under vacuum state, anode pole piece toasted 12 hours under 110～130 ℃ of temperature, cathode pole piece is 80～100 ℃ in temperature and toasted 12 hours down, in the bake process every 4 hours continuous extraction argon gas 3 times, baking is carried out the extraction argon gas 3 times after finishing again continuously, under vacuum state, below the cooling pole piece to 40 ℃, take out pole piece and carry out subsequent handling then;
(6) both positive and negative polarity lug welding: require the both positive and negative polarity lug is welded on the both positive and negative polarity pole piece according to battery design, ultrasonic bond is all adopted in the welding of both positive and negative polarity lug, avoid the lug rosin joint;
(7) preparation of battery: electric core comprises the barrier film between positive pole, negative pole and the both positive and negative polarity, the electricity core adopts barrier film/negative pole/barrier film/anodal winding-structure, it is the barrier film of 12 μ m～30 μ m that described barrier film adopts thickness, two electric cores is superimposed together forms superimposed electric core;
(8) electric core go into shell and encapsulation: superimposed electric core being packed into dash in the good battery container, is 150～250 ℃ in temperature, and pressure is 0.2～0.5MPa, and the time is with sealing machine heat-sealing battery top and a side wherein under 5～10 seconds conditions;
(9) electric core baking: the electric core of baking is 24 hours under 80～120 ℃ of vacuum states, in the bake process every 6 hours continuous extraction argon gas 3 times, carry out 3 argon gas of extraction more continuously after baking finishes, under vacuum state, below the cooling pole piece to 40 ℃, take out electric core and carry out the fluid injection operation then;
(10) battery liquid-filling: in the battery of electric core is housed, inject gel electrolyte, seal another side of battery then, gel electrolyte adopts 60～120 ℃ of temperature, pressure 0.5Kpa～2.5Mpa, 2～30 minutes time to carry out the mode polymerization that heat causes, shelve battery subsequently 24 hours, and welded two positive pole ears and negative lug respectively with aluminium strip and nickel strap before battery changes into;
(11) battery changes into and partial volume: adopt to change in limited time, chemical synthesis technology is 4 hours+0.2C of 0.05C charging 1 hour+0.1C charging charging 3 hours, then battery is carried out degasification, heat-sealing, cutting edge, shaping; Battery partial volume technology is charged to 4V for the 0.5C constant current, constant-current constant-voltage charging under 4V again, cut-off current is 0.01C, discharge into 2.5V with 0.5C then, the capacity that this moment, battery was emitted is a battery capacity, again battery is charged to 3.6V with the 0.5C constant current subsequently, again constant-current constant-voltage charging under 3.6V, cut-off current is 0.01C, if various chemical property indexs reach requirement and just can put in storage battery behind the battery partial volume.
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