CN102354765B - High cycle-index PLIB (polymer lithium ion battery) - Google Patents
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Abstract
The invention discloses a high cycle-index PLIB (polymer lithium ion battery), belonging to the field of lithium ion battery products. The PLIB comprises a positive pole plate, a negative pole plate and an electrolyte, wherein the positive pole plate comprises 10-18.6% of lithium hexaflourophosphate and 35-45% of lithium iron phosphate in percentage by weight; and the electrolyte comprises 20-29% of ethylene carbonate, 20-24% of DMC (dimethyl carbonate) and 47-60% of vinylene carbonate in percentage by weight. By adopting the process proportion of the PLIB, conductive ions are activated, dielectric constant of a solvent is improved, the solvent viscosity is reduced, the intermolecular forces are lessened, and the movement speed of ions is fastened, thus the electric conductivity of the battery is improved, the charge-discharge rate performance is improved, the stability is good, the cycle life is prolonged greatly and reaches above 2200 times.
Description
Technical field
The present invention relates to the lithium ion battery product scope, specially refer to a kind of polymer Li-ion battery of high cycle-index.
Background technology
Electrolyte used according to lithium ion battery is different, and lithium ion battery can be divided into liquid lithium ionic cell and the large class of polymer Li-ion battery two.In general, polymer Li-ion battery positive and negative pole material used is all identical with liquid lithium ion, and positive electrode can be divided into cobalt acid lithium, LiMn2O4, ternary material and LiFePO 4 material, and negative pole is graphite, and the operation principle of battery is also basically identical.Their main distinction is electrolytical difference, what liquid lithium ionic cell used is liquid electrolyte, polymer Li-ion battery replaces with solid polymer electrolyte, this polymer can be " dry state ", can be also " colloidal state ", at present most of polymeric colloid electrolyte that adopts.
The characteristic of polymer Li-ion battery and its positive electrode are closely related, and generally speaking positive electrode should meet: (1) in desired charge and discharge potential scope, has the electrochemistry compatibility with electrolyte solution; (2) height invertibity; (3) under full lithium state, performance stable in the air is good.Along with the development of polymer Li-ion battery, high-performance, positive electrode research work are cheaply constantly being carried out.
At present, the polymer Li-ion battery that cycle life is the highest generally is ferric phosphate lithium cell,, on the one hand because processing compound is single, causes manufacturing cost higher, and its inner collector and anode pole piece active material do not react, and chemical property is very unstable; Simultaneously due to factors such as lithium salt and plasticizer concentrations, also have that its conductance is not high, stability and discharge and recharge the reason such as rate variance, can't realize stable industrialization demand.
Chinese patent application number: 200810062968.1, invention and created name is: a kind of power polymer lithium ion battery and manufacture craft thereof, in this patent publication, the positive plate of polymer Li-ion battery is comprised of modified phosphate iron lithium, conductive agent, anodal binding agent, dispersant and plus plate current-collecting body, negative plate is comprised of graphite, conductive agent, negative pole binding agent and negative current collector, first dispersed electro-conductive agent in manufacturing process, the disperse modified LiFePO4, added efficient organic binder bond again.The positive electrode of this power polymer lithium ion battery is LiFePO4, its mass percent reaches 70% ~ 90%, adopt simultaneously a kind of efficient organic binder bond, electron conduction and Ionic diffusion energy have been improved, but after lithium ion battery charged and discharged circulation 1000 times, the capability retention of battery was desirable not to the utmost.
Chinese patent application number: 200810062969.6, invention and created name is: polymer Li-ion battery and manufacture method thereof, polymer Li-ion battery in this patent publication, comprise utmost point group, lug and battery case, described utmost point group inside is composed in parallel by the utmost point group unit that is no less than 2, and wherein monolithic utmost point group unit is that positive and negative plate forms with rear coiling of barrier film isolation.This application case is just improved the shape structural feature of polymer Li-ion battery, and the component from electrode material or electrolyte useless and content deals with problems, and therefore, cycle performance is still poor.
Although, LiFePO is also disclosed in existing document
4Battery charges and discharge in theory cycle-index and can reach 2000 times, but in the actual experiment process, is difficult to reach disclosed 2000 times in theory, and the capability retention of battery is just lower after general 1000 times, can't realize the real function of battery.
Summary of the invention
The technical problem that invention will solve
Effectively charge and discharge cycle-index for lithium ion battery in above-mentioned prior art less, common electrolyte can not conduct electricity and the low deficiency of LiFePO4 " conductivity " by macroion, the invention provides the active material of anode pole piece and the composition of electrolytic solution, a kind of polymer Li-ion battery of high cycle-index is provided, make manufacturing cost reduce, battery cycle life is high, good stability, solves the defect that faces in prior art products.
Technical scheme
For achieving the above object, technical scheme provided by the invention is:
The polymer Li-ion battery of a kind of high cycle-index of the present invention, comprise anode pole piece, cathode pole piece and electrolyte, contains weight percent content on described anode pole piece and be 10% ~ 18.6% lithium hexafluoro phosphate (LiPF
6) and 35% ~ 45% LiFePO 4 (LiFePO
4); Electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 20% ~ 29%, dimethyl carbonate (DMC) 20% ~ 24% and vinylene carbonate (VC) 47% ~ 60%.
Preferably, on anode pole piece of the present invention, the weight percent content of each component is: crystalline flake graphite 0.7% ~ 1%, carbon black 1.5% ~ 5%, lithium hexafluoro phosphate (LiPF
6) 10% ~ 18.6%, LiFePO 4 (LiFePO
4) 35% ~ 45%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.
Preferably, described electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 23% ~ 26%, dimethyl carbonate (DMC) 21% ~ 23% and vinylene carbonate (VC) 52% ~ 56%.
Preferably, on anode pole piece, the weight percent content of each component is: crystalline flake graphite 0.7% ~ 1%, carbon black 3 ~ 4.5%, lithium hexafluoro phosphate (LiPF
6) 13% ~ 15.5%, LiFePO 4 (LiFePO
4) 38.5% ~ 41%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.
Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 0.5% ~ 1%, carbon black 0.5% ~ 1%, Delanium 48%, water 35% ~ 36%, water-based electrode adhesive LA133 15%.
In above-mentioned polymer Li-ion battery, the positive and negative electrode slurry is uniformly mixed coating oven dry in 5 ~ 8 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, the mixed solvent of filling macroion conductive solvent EC+DMC, the i.e. mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC), keeping electrolyte solvent is-40 ℃ in dew point temperature, and absolute humidity is 54.5g/m
3The air humidity environment under, the inferior ethene fat (VC) of filling carbonic acid, and vacuum stirring, can make cycle-index and reach polymer Li-ion battery more than 2200 times.
Beneficial effect
Adopt technical scheme provided by the invention, with existing known technology, compare, have following remarkable result:
After the present invention adopts above-mentioned processing compound, utilize lithium hexafluoro phosphate (LiPF
6) and mixed processing after the electrolyte mixed solvent that makes of EC+DMC, make it activate conductive ion, improved the solvent dielectric constant, reduced solvent viscosity, intermolecular force diminishes, ionic transfer speed is accelerated, thereby the battery conductive rate is improved, charge-discharge magnification performance improvement, good stability, cycle life improves greatly, and cycle life can reach more than 2200 times.
Description of drawings
Fig. 1 is the process chart that in the polymer Li-ion battery of a kind of high cycle-index of the present invention, electrolyte is processed.
Embodiment
For further understanding content of the present invention, the present invention is described in detail by reference to the accompanying drawings.
The polymer Li-ion battery of a kind of high cycle-index of the present invention, comprise anode pole piece, cathode pole piece and electrolyte, contains weight percent content on anode pole piece and be 10% ~ 18.6% lithium hexafluoro phosphate (LiPF
6) and 35% ~ 45% LiFePO 4 (LiFePO
4); Electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 20% ~ 29%, dimethyl carbonate (DMC) 20% ~ 24% and vinylene carbonate (VC) 47% ~ 60%.
Wherein, on anode pole piece, the weight percent content of each component is: crystalline flake graphite 0.7% ~ 1%, carbon black 1.5% ~ 5%, lithium hexafluoro phosphate (LiPF
6) 10% ~ 18.6%, LiFePO 4 (LiFePO
4) 35% ~ 45%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 0.5% ~ 1%, carbon black 0.5% ~ 1%, Delanium 48%, water 35% ~ 36%, water-based electrode adhesive LA133 15%.
By reference to the accompanying drawings shown in 1, polymer Li-ion battery of the present invention, the positive and negative electrode slurry is uniformly mixed coating oven dry in 5 ~ 8 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, adjust the dew point temperature and reach-40 ℃, open dehumidification system and make the absolute humidity in drying shed be reached for 54.5g/m
3, add the inferior ethene fat (VC) of carbonic acid in the EC+DMC mixed solvent, and vacuum stirring, can make cycle-index and reach polymer Li-ion battery more than 2200 times.Polymer Li-ion battery of the present invention and LiFePO of the prior art
4Battery, LiFePO
4+ conductive carbon battery, LiFePO
4+ high volence metal ion technical performance parameter comparison is as shown in table 1 below.
Table 1 polymer Li-ion battery of the present invention and the battery performance parameter table of comparisons of the prior art
The invention will be further described below in conjunction with embodiment.
Embodiment 1
The polymer Li-ion battery of a kind of high cycle-index of the present embodiment, comprise anode pole piece, cathode pole piece and electrolyte, and wherein, on anode pole piece, the weight percent content of each component is: crystalline flake graphite 0.7%, carbon black 3.3%, lithium hexafluoro phosphate (LiPF
6) 17%, LiFePO 4 (LiFePO
4) 38%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.
Electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 20%, dimethyl carbonate (DMC) 24% and vinylene carbonate (VC) 56%.
Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 0.5%, carbon black 1%, Delanium 48%, water 35.5%, water-based electrode adhesive LA133 15%.
Wherein, the lithium hexafluoro phosphate of the present embodiment use becomes chemical industry Co., Ltd to produce by Shanghai nation; LiFePO 4 effluent south red sun investor group Co., Ltd produces; Ethylene carbonate is produced by Nanjing first trade Co., Ltd of unit; Dimethyl carbonate is produced by the rich chemical industry of Quzhou City's riel Co., Ltd; Vinylene carbonate is produced by this International Trading Company Ltd of bonded area, Zhangjiagang Bry, and density (25 ℃) is 1.3210 ~ 1.3290g/cm
31-METHYLPYRROLIDONE is produced by Qingyun, Shandong long letter chemistry Science and Technology Ltd., carries out company standard: Q/1400MCX002-2009, and (20 ℃ 100g/L) are 7.5-10 to the pH value; Polyvinylidene fluoride HSV900 is from the outstanding plastic material of Dongguan City yellow river silver business department, and manufacturer is French A Kema; Water-based electrode adhesive LA133 is produced by Chengdu Yindile Power Source Science and Technology Co., Ltd, active principle: 14.9%, and operative norm: Q/725366413-0.002-2001.
The polymer Li-ion battery of the high cycle-index of the present embodiment, the positive and negative electrode slurry is uniformly mixed coating oven dry in 5 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, the mixed solvent of filling macroion conductive solvent EC+DMC, the i.e. mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC), keeping electrolyte solvent is-40 ℃ in dew point temperature, and absolute humidity is 54.5g/m
3The air humidity environment under, the inferior ethene fat (VC) of filling carbonic acid, then being evacuated to vacuum values is-0.08MPa, stir 4h under vacuum environment, mixing speed is 35m/s, can make polymer Li-ion battery, the polymer Li-ion battery of the high cycle-index of the present embodiment after cycle-index reaches 2208 times, capability retention still reaches 70.0%.
Embodiment 2
The polymer Li-ion battery of a kind of high cycle-index of the present embodiment, comprise anode pole piece, cathode pole piece and electrolyte, and wherein, on anode pole piece, the weight percent content of each component is: crystalline flake graphite 1%, carbon black 3%, lithium hexafluoro phosphate (LiPF
6) 10%, LiFePO 4 (LiFePO
4) 45%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.
Electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 23%, dimethyl carbonate (DMC) 20% and vinylene carbonate (VC) 57%.
Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 0.8%, carbon black 0.5%, Delanium 48%, water 35.7%, water-based electrode adhesive LA133 15%.Other are with embodiment 1.
The polymer Li-ion battery of the high cycle-index of the present embodiment, the positive and negative electrode slurry is uniformly mixed coating oven dry in 6 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, the mixed solvent of filling macroion conductive solvent EC+DMC, the i.e. mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC), keeping electrolyte solvent is-40 ℃ in dew point temperature, and absolute humidity is 54.5g/m
3The air humidity environment under, the inferior ethene fat (VC) of filling carbonic acid, then being evacuated to vacuum values is-0.08MPa, stir 8h under vacuum environment, mixing speed is 38m/s, can make polymer Li-ion battery, the polymer Li-ion battery of the high cycle-index of the present embodiment after cycle-index reaches 2240 times, capability retention still reaches 70.0%.
Embodiment 3
The polymer Li-ion battery of a kind of high cycle-index of the present embodiment, comprise anode pole piece, cathode pole piece and electrolyte, and wherein, on anode pole piece, the weight percent content of each component is: crystalline flake graphite 0.8%, carbon black 1.5%, lithium hexafluoro phosphate (LiPF
6) 18.6%, LiFePO 4 (LiFePO
4) 38.1%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.
Electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 29%, dimethyl carbonate (DMC) 21% and vinylene carbonate (VC) 50%.
Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 1%, carbon black 0.5%, Delanium 48%, water 35.5%, water-based electrode adhesive LA133 15%.Other are with embodiment 1.
The polymer Li-ion battery of the high cycle-index of the present embodiment, the positive and negative electrode slurry is uniformly mixed coating oven dry in 7 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, the mixed solvent of filling macroion conductive solvent EC+DMC, the i.e. mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC), keeping electrolyte solvent is-40 ℃ in dew point temperature, and absolute humidity is 54.5g/m
3The air humidity environment under, the inferior ethene fat (VC) of filling carbonic acid, then being evacuated to vacuum values is-0.08MPa, stir 6 h under vacuum environment, mixing speed is 36m/s, can make polymer Li-ion battery, the polymer Li-ion battery of the high cycle-index of the present embodiment after cycle-index reaches 2205 times, capability retention still reaches 70.0%.
Embodiment 4
The polymer Li-ion battery of a kind of high cycle-index of the present embodiment, comprise anode pole piece, cathode pole piece and electrolyte, and wherein, on anode pole piece, the weight percent content of each component is: crystalline flake graphite 0.9%, carbon black 5%, lithium hexafluoro phosphate (LiPF
6) 15.5%, LiFePO 4 (LiFePO
4) 37.6%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.
Electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 20%, dimethyl carbonate (DMC) 20% and vinylene carbonate (VC) 60%.
Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 0.7%, carbon black 0.8%, Delanium 48%, water 35.5%, water-based electrode adhesive LA133 15%.Other are with embodiment 1.
The polymer Li-ion battery of the high cycle-index of the present embodiment, the positive and negative electrode slurry is uniformly mixed coating oven dry in 8 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, the mixed solvent of filling macroion conductive solvent EC+DMC, the i.e. mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC), keeping electrolyte solvent is-40 ℃ in dew point temperature, and absolute humidity is 54.5g/m
3The air humidity environment under, the inferior ethene fat (VC) of filling carbonic acid, then stirred 2 hours take mixing speed as 18m/s, being evacuated to vacuum values is-0.08MPa again, stir 2 h under vacuum environment, mixing speed is 38m/s, can make polymer Li-ion battery, the polymer Li-ion battery of the high cycle-index of the present embodiment after cycle-index reaches 2212 times, capability retention still reaches 70.0%.
Embodiment 5
The polymer Li-ion battery of a kind of high cycle-index of the present embodiment, comprise anode pole piece, cathode pole piece and electrolyte, and wherein, on anode pole piece, the weight percent content of each component is: crystalline flake graphite 0..9%, carbon black 4.5%, lithium hexafluoro phosphate (LiPF
6) 18.6%, LiFePO 4 (LiFePO
4) 35%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.
Electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 29%, dimethyl carbonate (DMC) 24% and vinylene carbonate (VC) 47%.
Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 1%, carbon black 1%, Delanium 48%, water 35%, water-based electrode adhesive LA133 15%.Other are with embodiment 1.
The polymer Li-ion battery of the high cycle-index of the present embodiment, the positive and negative electrode slurry is uniformly mixed coating oven dry in 6 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, the mixed solvent of filling macroion conductive solvent EC+DMC, the i.e. mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC), keeping electrolyte solvent is-40 ℃ in dew point temperature, and absolute humidity is 54.5g/m
3The air humidity environment under, the inferior ethene fat (VC) of filling carbonic acid, then stirred 2 hours take mixing speed as 18m/s, being evacuated to vacuum values is-0.08MPa again, stir 6 h under vacuum environment, mixing speed is 35m/s, can make polymer Li-ion battery, the polymer Li-ion battery of the high cycle-index of the present embodiment after cycle-index reaches 2250 times, capability retention still reaches 70.0%.
Embodiment 6
The polymer Li-ion battery of a kind of high cycle-index of the present embodiment, comprise anode pole piece, cathode pole piece and electrolyte, and wherein, on anode pole piece, the weight percent content of each component is: crystalline flake graphite 0.9%, carbon black 4.1%, lithium hexafluoro phosphate (LiPF
6) 13%, LiFePO 4 (LiFePO
4) 41%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.
Electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 26%, dimethyl carbonate (DMC) 22% and vinylene carbonate (VC) 52%.
Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 0.5%, carbon black 0.5%, Delanium 48%, water 36%, water-based electrode adhesive LA133 15%.Other are with embodiment 1.
The polymer Li-ion battery of the high cycle-index of the present embodiment, the positive and negative electrode slurry is uniformly mixed coating oven dry in 8 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, the mixed solvent of filling macroion conductive solvent EC+DMC, the i.e. mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC), keeping electrolyte solvent is-40 ℃ in dew point temperature, and absolute humidity is 54.5g/m
3The air humidity environment under, the inferior ethene fat (VC) of filling carbonic acid, then stirred 2 hours take mixing speed as 18m/s, being evacuated to vacuum values is-0.08MPa again, stir 5 h under vacuum environment, mixing speed is 36m/s, can make polymer Li-ion battery, the polymer Li-ion battery of the high cycle-index of the present embodiment after cycle-index reaches 2210 times, capability retention still reaches 70.0%.
Embodiment 7
The polymer Li-ion battery of a kind of high cycle-index of the present embodiment, comprise anode pole piece, cathode pole piece and electrolyte, and wherein, on anode pole piece, the weight percent content of each component is: crystalline flake graphite 1%, carbon black 4.6%, lithium hexafluoro phosphate (LiPF
6) 14.9%, LiFePO 4 (LiFePO
4) 38.5%, 1-METHYLPYRROLIDONE (NMP) 39%, polyvinylidene fluoride HSV900 2%.
Electrolyte is comprised of ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and each composition weight percent content of electrolyte is: ethylene carbonate (EC) 24%, dimethyl carbonate (DMC) 23% and vinylene carbonate (VC) 53%.
Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 0.5%, carbon black 0.5%, Delanium 48%, water 36%, water-based electrode adhesive LA133 15%.Other are with embodiment 1.
The polymer Li-ion battery of the high cycle-index of the present embodiment, the positive and negative electrode slurry is uniformly mixed coating oven dry in 5 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, the mixed solvent of filling macroion conductive solvent EC+DMC, the i.e. mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC), keeping electrolyte solvent is-40 ℃ in dew point temperature, and absolute humidity is 54.5g/m
3The air humidity environment under, the inferior ethene fat (VC) of filling carbonic acid, then stirred 2 hours take mixing speed as 18m/s, being evacuated to vacuum values is-0.08MPa again, stir 4 h under vacuum environment, mixing speed is 36m/s, can make polymer Li-ion battery, the polymer Li-ion battery of the high cycle-index of the present embodiment after cycle-index reaches 2223 times, capability retention still reaches 70.0%.
After above-mentioned specific embodiment processing compound, utilize the lithium hexafluoro phosphate (LiPF of proportioning of the present invention
6) and process after the electrolyte mixed solvent of EC+DMC, make it activate conductive ion, improved the solvent dielectric constant, reduced solvent viscosity, intermolecular force diminishes, ionic transfer speed is accelerated, thereby the battery conductive rate is improved, charge-discharge magnification performance improvement, good stability, cycle life improves greatly, and cycle life can reach more than 2200 times.The present invention has well solved common electrolyte can not macroion conduction and the low technical barrier of LiFePO4 " conductivity ".
Claims (3)
1. the polymer Li-ion battery of a high cycle-index, comprise anode pole piece, cathode pole piece and electrolyte, it is characterized in that:
On described anode pole piece, the weight percent content of each component is: crystalline flake graphite 0.7% ~ 1%, carbon black 1.5% ~ 5%, lithium hexafluoro phosphate 10% ~ 18.6%, LiFePO 4 35% ~ 45%, 1-METHYLPYRROLIDONE 39%, polyvinylidene fluoride HSV900 2%; Before the cathode pole piece oven dry, the weight percent content of each component is: crystalline flake graphite 0.5% ~ 1%, carbon black 0.5% ~ 1%, Delanium 48%, water 35% ~ 36%, water-based electrode adhesive LA133 15%; Electrolyte is comprised of ethylene carbonate, dimethyl carbonate and vinylene carbonate, and each composition weight percent content of electrolyte is: ethylene carbonate 20% ~ 29%, dimethyl carbonate 20% ~ 24% and vinylene carbonate 47% ~ 60%;
In above-mentioned polymer Li-ion battery, the positive and negative electrode slurry is uniformly mixed coating oven dry in 5 ~ 8 hours under vacuum high-pressure after, high pressure roller, make pole piece roll and be coiled into battery core, then, the mixed solvent of filling macroion conductive solvent ethylene carbonate and dimethyl carbonate, keeping electrolyte solvent is-40 ℃ in dew point temperature, absolute humidity is 54.5g/m
3The air humidity environment under, the inferior ethene fat of filling carbonic acid, and vacuum stirring 2 ~ 8h, vacuum values is-0.08MPa, mixing speed is 35 ~ 38m/s, can make cycle-index and reach polymer Li-ion battery more than 2200 times.
2. the polymer Li-ion battery of a kind of high cycle-index according to claim 1, it is characterized in that: described electrolyte is comprised of ethylene carbonate, dimethyl carbonate and vinylene carbonate, and each composition weight percent content of electrolyte is: ethylene carbonate 23% ~ 26%, dimethyl carbonate 21% ~ 23% and vinylene carbonate 52% ~ 56%.
3. the polymer Li-ion battery of a kind of high cycle-index according to claim 2, it is characterized in that: on anode pole piece, the weight percent content of each component is: crystalline flake graphite 0.7% ~ 1%, carbon black 3% ~ 4.5%, lithium hexafluoro phosphate 13% ~ 15.5%, LiFePO 4 38.5% ~ 41%, 1-METHYLPYRROLIDONE 39%, polyvinylidene fluoride HSV900 2%.
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