CN103579665A - Gel lithium ion battery with high and low temperature balance and fabrication method thereof - Google Patents
Gel lithium ion battery with high and low temperature balance and fabrication method thereof Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to the technical field of manufacturing of a lithium ion battery, and particularly relates to a gel lithium ion battery with high and low temperature balance. The gel lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and electrolyte, wherein the positive electrode contains a positive active material; the negative electrode contains a negative active material; the diaphragm is arranged between the anode positive electrode and the negative electrode; the diaphragm is a gel diaphragm of which two sides are coated by kynar-hexafluoropropylene; the electrolyte comprises electrolyte and a solvent; the electrolyte is a lithium salt; the concentration is 1.0-1.2 mol/L; the solvent comprises 15-20% of ethylene carbonate, 50-60% of ethyl methyl carbonate, 8-15% of propylene carbonate and 8-15% of diethyl carbonate by mass fraction. The gel lithium ion battery is simple in formula, and matched with the electrolyte with high and low temperature resistance by gelatinization of the diaphragm of the lithium ion battery, so as to improve the characteristics of the high and low temperature resistance of the battery.
Description
Technical field
The present invention relates to technical field of lithium-ion battery, relate in particular to gel lithium ion battery that a kind of high low temperature takes into account and preparation method thereof.
Background technology
The useful performances such as lithium ion battery has that operating voltage is high, energy density is large, have extended cycle life, self-discharge rate is little, low pollution, memory-less effect, become the research and development focus of current secondary cell, it is widely used as aspects such as mobile phone, portable computer, video cameras at portable type electronic product.The application of ample resources active research lithium ion battery aspect electric motor car and mixed type power car also dropped in countries in the world now, gel lithium ion battery particularly, gel lithium ion battery has demonstrated powerful growth momentum, its use has been not limited in fields such as portable type electronic product, electric motor cars, is also generalized to the fields such as artificial satellite, space flight and aviation.
Existing gel lithium ion battery is that a kind of electrolyte is the lithium ion battery that high-molecular gel electric conducting material or barrier film have gelation coating, due to the special construction of gel, gel lithium ion battery has lower ionic conductivity, good conductivity and liquid-keeping property etc.But current gel lithium ion battery is in order to reach good electric conductivity, longer cycle life etc., the gel lithium ion battery formula of researching and developing is complicated, as some lithium ion battery applications imidazoles, pyroles ionic liquid-gel polymer electrolyte, and its cost is high, is more difficult to get extensive use; The gel lithium ion battery of present stage is difficult to the serviceability that simultaneously reaches high temperature resistant and low temperature resistant on the other hand.
At present, in the urgent need to developing a kind of gel lithium ion battery of filling a prescription simply and thering is high and low temperature resistance, and the manufacture method of this kind of gel type Li-ion battery.
Summary of the invention
For above-mentioned the deficiencies in the prior art, one of object of the present invention has been to provide a kind of gel lithium ion battery simple and that high low temperature is taken into account of filling a prescription.
Two of object of the present invention is to provide the manufacture method of the gel lithium ion battery that a kind of high low temperature takes into account.
To achieve these goals, technical scheme of the present invention is as follows:
The gel lithium ion battery that low temperature is taken into account, comprises the positive pole that contains positive active material, the negative pole that contains negative electrode active material and be arranged on described positive pole and described negative pole between barrier film and electrolyte; Described barrier film is that coating on both sides has the gel-type barrier film that comprises polyvinylidene fluoride-hexafluoropropylene, described electrolyte comprises electrolyte and solvent, described electrolyte is lithium salts, concentration is 1.0～1.2mol/L, and described solvent comprises 15%～20% ethylene carbonate, 50%～60% methyl ethyl carbonate, 8%～15% propene carbonate, 8%～15% diethyl carbonate by mass fraction.
Preferably, described electrolyte also comprises that accounting for solvent quality mark is 1.0%～1.5% vinylene carbonate.
Preferably, the gel layer thickness of described gel-type barrier film is 1～4 μ m, and described gel layer thickness is 2 μ m preferably, the polymer copolymerization compound that the gel layer of described gel-type barrier film is polyvinylidene fluoride-hexafluoropropylene.
Preferably, described barrier film is one or more in polyethylene barrier film, polypropylene diaphragm, cellulose composite membrane.
Preferably, described positive active material is cobalt acid lithium, and the preferred good cobalt acid lithium of high rate performance can improve the low temperature performance of battery, the granularity D of described positive active material
50be 5～15 μ m.
Preferably, described lithium salts is one or more in lithium hexafluoro phosphate, lithium perchlorate, LiBF4, preferably lithium hexafluoro phosphate.
Preferably, described negative electrode active material is Delanium, preferably has the High interlayer spacing Delanium of soft carbon clad structure, and its interlamellar spacing is more than 0.3358nm, and its high temperature performance is good, can further improve the high-low temperature resistant characteristic of lithium ion battery.
The preparation method of the gel lithium ion battery that high low temperature is taken into account, comprises the following steps:
(1) preparation of positive pole, negative pole, gel-type barrier film and electrolyte;
(2) battery combination: positive pole, barrier film and negative pole coiling are pressurizeed by heating mutually compound, then pack battery case into, subsequently battery case is toasted, inject the electrolyte into housing;
(3) change into: by production technology, change into;
(4) battery gel: after changing into, battery is placed on to 65～85 ℃ of hot pressing 3～4h;
(5) anode ring forming: finally extract unnecessary gas in battery core, gel lithium ion battery finished product is made in encapsulation.
Preferably, gelation barrier film described in described (1) is prepared as the high-molecular copolymer at polyvinylidene fluoride-hexafluoropropylene described in described barrier film coating on both sides.
Compared with prior art, the gel lithium ion battery that high low temperature of the present invention is taken into account and preparation method's tool of described gel lithium ion battery have the following advantages:
Gelatin membrane has good chemical property and security performance, electrolyte has good high and low temperature resistance, the electrolyte of high-low temperature resistant and gelatin membrane collocation, compatibility is simple, application is convenient, and the material that electrolyte adopts is simple, cost is low, without adding in addition many other additives, can reach the characteristic that promotes battery high-low temperature resistant.Preparation method of the present invention, technique is simple, with low cost, is easy to realize produce in enormous quantities.
Accompanying drawing explanation
The discharge curve of Fig. 1, the embodiment of the present invention 1 and comparative example 1 different temperatures.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Embodiment 1
The gel lithium ion battery that a kind of high low temperature is taken into account (take 357095-2730mAh as example), comprising:
The positive pole that contains positive active material, wherein positive active material is the good cobalt acid lithium of high rate performance, its granularity D
50be 5～15 μ m, use and can improve the chemical property of battery in lithium ion battery;
The negative pole that contains negative electrode active material, wherein negative electrode active material is Delanium, preferably has the High interlayer spacing Delanium of soft carbon clad structure, its high temperature performance is good, can improve the high-low temperature resistant characteristic of lithium ion battery;
Be arranged on the barrier film between described positive pole and described negative pole, barrier film is that coating on both sides has the gel-type barrier film that comprises polyvinylidene fluoride-hexafluoropropylene, general barrier film is one or more in polyethylene barrier film, polypropylene diaphragm, cellulose composite membrane, preferably polyethylene barrier film herein, barrier film both sides are gel layer, the thickness of the one side gel layer of gel-type barrier film can be set to 1～4 μ m, and the thickness of its one side gel layer is 2 μ m preferably;
And be full of at positive pole, electrolyte between negative pole and barrier film, electrolyte comprises that concentration is lithium salts electrolyte and the solvent of 1.2mol/L, the optional lithium hexafluoro phosphate of lithium salts, lithium perchlorate, one or more in LiBF4, be lithium hexafluoro phosphate in the present embodiment, the optional scope of lithium salts electrolyte concentration is 1.0～1.2mol/L, solvent can be set to comprise 15%～20% ethylene carbonate by mass fraction, 50%～60% methyl ethyl carbonate, 8%～15% propene carbonate, 8%～15% diethyl carbonate, also can add as required that to account for solvent quality mark be 1.0%～1.5% vinylene carbonate, the solvent of selecting in the present embodiment comprises 20% ethylene carbonate by mass fraction, 60% methyl ethyl carbonate, 10% propene carbonate, 10% diethyl carbonate.
The preparation method of the gel lithium ion battery that high low temperature is taken into account as mentioned above, comprises the following steps:
(1) preparation of positive pole, negative pole, gel-type barrier film and electrolyte, wherein gelation barrier film is prepared as painting polyethylene barrier film, polyvinylidene fluoride-hexafluoropropylene copolymer is coated on polyethylene barrier film, coating layer thickness is 1～4 μ m, be preferably 2 μ m, subsequently the barrier film after coating is sheared, dry for standby, generally selects vacuum to preserve;
(2) battery combination: positive pole, barrier film and negative pole are reeled and pressurizeed mutually compound by heating, then pack battery case into, at certain pressure, temperature by battery case side seal, closedtop, subsequently the battery case of sealing is toasted, active material and Gelling Materials on activation anode, negative pole and barrier film, inject the electrolyte into housing subsequently;
(3) change into: by production technology, half-formed lithium ion battery is changed into;
(4) battery gel: after changing into, battery is placed on to 65～85 ℃ of hot pressing 3～4h;
(5) anode ring forming: finally extract unnecessary gas in battery core, gel lithium ion battery finished product is made in encapsulation.
The performance of gel lithium ion battery 357095～2730mAh:
A. high temperature resistant storge quality: store 10h at 80 ℃, the capacity restoration rate of lithium ion battery surpasses 95%, and internal resistance Magnification is higher, is generally 22% left and right, and the deformation of battery is less, and its thickness increases to 3.3%～4.5%.
B. high and low temperature resistance: the capability retention that gel lithium ion battery discharges under high temperature (60 ℃) environment and the platform conservation rate of high temperature are best, can reach more than 100% respectively, the capability retention discharging under low temperature (30 ℃) environment slightly a little less than, but also can reach more than 53%, the platform conservation rate of its low temperature is poor, but along with temperature raises, the capability retention (> 90%) discharging in low temperature (20 ℃) environment and the platform conservation rate (> 50%) of low temperature are more excellent, this gel lithium ion battery has showed the performance of good high-low temperature resistant.
C. gelling performance: gel lithium ion battery is disassembled, and internal surface of battery shell raffinate is few, barrier film and positive active material good bonding.
Embodiment 2
The gel lithium ion battery 357095-2730mAh that low temperature is taken into account, comprising:
The positive pole that contains positive active material, wherein positive active material is the good cobalt acid lithium of high rate performance, its granularity D
50be 5～15 μ m, use and can improve the electrical property of battery in lithium ion battery;
The negative pole that contains negative electrode active material, wherein negative electrode active material is Delanium, preferably has the High interlayer spacing Delanium of soft carbon clad structure, its high temperature performance is good, can improve the high-low temperature resistant characteristic of lithium ion battery;
Be arranged on the barrier film between described positive pole and described negative pole, barrier film is that coating on both sides has the gelation barrier film that comprises polyvinylidene fluoride-hexafluoropropylene, and barrier film is polypropylene diaphragm, and barrier film both sides are gel layer, and gel layer thickness is 2 μ m preferably;
And the electrolyte of injection between positive pole, negative pole and barrier film, electrolyte comprises that concentration is 1.0mol/L lithium hexafluoro phosphate and 0.1mol/L tetrafluoro boric acid lithium electrolyte and solvent, and solvent comprises 20% ethylene carbonate, 50% methyl ethyl carbonate, 13.5% propene carbonate, 15% diethyl carbonate, 1.5% vinylene carbonate additive by mass fraction.Its preparation method is with embodiment 1.
The performance of the gel lithium ion battery 357095-2730mAh of preparation:
A. high temperature resistant storge quality: store 10h at 80 ℃, the capacity restoration rate of lithium ion battery surpasses 95%, and internal resistance Magnification is higher, is generally 22% left and right, and the deformation of battery is less, and its thickness increases to 3.3%～4.5%.
B. high and low temperature resistance: the capability retention that gel lithium ion battery discharges under high temperature (60 ℃) environment and the platform conservation rate of high temperature are best, can reach more than 100% respectively, the capability retention discharging under low temperature (30 ℃) environment slightly a little less than, but also can reach more than 53%, the platform conservation rate of its low temperature is poor, but along with temperature raises, the capability retention (> 90%) discharging in low temperature (20 ℃) environment and the platform conservation rate (> 50%) of low temperature are more excellent, this gel lithium ion battery has showed the performance of good high-low temperature resistant.
C. gelling performance: gel lithium ion battery is disassembled, and internal surface of battery shell raffinate is few, barrier film and positive active material good bonding.
Embodiment 3
The gel lithium ion battery 357095-2730mAh that low temperature is taken into account, comprising:
The positive pole that contains positive active material, wherein positive active material is the good cobalt acid lithium of high rate performance, its granularity D
50for 5-15 μ m, use and can improve the electrical property of battery in lithium ion battery;
The negative pole that contains negative electrode active material, wherein negative electrode active material is Delanium, preferably has the High interlayer spacing Delanium of soft carbon clad structure, its high temperature performance is good, can improve the high-low temperature resistant characteristic of lithium ion battery;
Be arranged on the barrier film between described positive pole and described negative pole, barrier film is that coating on both sides has the gelation barrier film that comprises polyvinylidene fluoride-hexafluoropropylene, and barrier film is polypropylene diaphragm, and barrier film both sides are gel layer, and gel layer thickness is 4 μ m;
And the electrolyte of injection between positive pole, negative pole and barrier film, electrolyte comprises that concentration is the lithium hexafluoro phosphate of 1.2mol/L and the mixed electrolyte of LiBF4 and solvent, and the solvent of selecting in the present embodiment comprises 15% ethylene carbonate, 55% methyl ethyl carbonate, 15% propene carbonate, 15% diethyl carbonate and 1.5% vinylene carbonate additive by mass fraction.Its preparation method is with embodiment 1.
The performance of the gel lithium ion battery 357095-2730mAh of preparation:
A. low temperature performance: the capability retention of 1C electric discharge is more than 70% under low temperature (20 ℃) environment, and this gel lithium ion battery has showed the performance of good low temperature discharge.
B. gelling performance: gel lithium ion battery is disassembled, and internal surface of battery shell raffinate is few, barrier film and positive active material good bonding.
Comparative example 1
A kind of lithium ion battery, comprise the positive pole that contains positive active material, the negative pole that contains negative electrode active material and be arranged on described positive pole and described negative pole between barrier film and be full of the electrolyte between anodal, negative pole and barrier film, electrolyte comprises that concentration is lithium salts electrolyte and the solvent of 1.0～1.2mol/L, it is that from embodiment 1 different the barrier film adopting is common polyethylene barrier film, does not do gelation to it and processes.Its preparation method is identical with embodiment 1.
Comparative example 2
, comprise the positive pole that contains positive active material, the negative pole that contains negative electrode active material and be arranged on described positive pole and described negative pole between barrier film and be full of the electrolyte between anodal, negative pole and barrier film; Electrolyte comprises that concentration is lithium salts electrolyte and the solvent of 1.0～1.2mol/L, its is different from embodiment 1: its solvent adopts conventional solvent, and barrier film adopts gelatin membrane.In comparative example 2, use conventional electrolysis liquid solvent (EC:EMC:DMC=1:1:1) and gelatin membrane to use, low temperature-30 ℃ emit very few, and the lower 80 ℃ of storage volumes of hot environment are recovered below 93%.Its preparation method is identical with embodiment 1.
Comparative example 3
, comprise the positive pole that contains positive active material, the negative pole that contains negative electrode active material and be arranged on described positive pole and described negative pole between barrier film and be full of the electrolyte between anodal, negative pole and barrier film; Its electrolyte and solvent are wherein identical with embodiment 3, and barrier film adopts common diaphragm.Its preparation method is identical with embodiment 3.
In comparative example 3, use electrolyte identical with embodiment 3, it is obviously on the low side that the subzero 20 degrees Celsius of 1C of low temperature emit electricity ratio embodiment 3, and the lower 80 degrees Celsius of storage volumes of hot environment are recovered more than 93%.
Above-described embodiment, is preferred embodiment of the present invention, is not used for limiting the scope of the present invention, and the equivalence of being done with the structure described in the claims in the present invention, feature and principle therefore all changes or modifies, within all should being included in the claims in the present invention scope.
The experiment of embodiment 1, comparative example 1 and comparative example 2 detects
In following chart, the battery that represents of the present embodiment 1 is numbered 8,9,10,11, and the battery that represents of comparative example 1 is numbered 25, and the battery that represents of comparative example 2 is numbered 26.
High-temperature shelf property detects: the battery of required detection is deposited after 10h in 80 ℃ of environment, detected battery capacity, internal resistance and cell thickness before depositing and after depositing.Testing result is as shown in table 1 below, the gel lithium ion battery of embodiment 1 and embodiment 2 wants high compared to lithium ion battery its capability retention, capacity restoration rate in hot environment in comparative example 1 and 2, and the thickness increment rate of its resistance Magnification and battery is less, shown that gel lithium ion battery has better electrical property and good security performance when high temperature is deposited, it has good resistance to elevated temperatures.
Table 1
Under different temperatures, discharge performance detects:
Low temperature discharge detects, as shown in table 2 below, wherein low temperature performance detects and to be divided into two projects and to detect, and wherein design parameter is respectively that-30 ℃ of 0.2C are discharged to 2.75V and-20 ℃ of 0.2C are discharged to 3V, and the design parameter that normal temperature discharge performance detects is that 25 ℃ of 0.5C are discharged to 2.75V.
Table 2
From upper table 2, in-30 ℃ of environment, embodiment 1,2 and comparative example 1,2 are compared, and the capability retention of embodiment 1,2 is higher, and embodiment 1,2 has better electrical property in low temperature environment; In-20 ℃ of environment, embodiment 1,2 and comparative example 1,2 are compared, and the capability retention of embodiment 1,2 is higher, and the platform time is longer, embodiment 1,2 has better electrical property in low temperature environment, and use that can be more effective, stable, safe is at low temperature environment.
High temperature discharge detects, as shown in table 3 below, and the design parameter that wherein normal temperature discharge performance detects is that 25 ℃ of 0.5C are discharged to 2.75V, and the design parameter of high temperature discharge Performance Detection is that 60 ℃ of 0.5C are discharged to 3.0V.
Table 3
From upper table 3, in hot environment, embodiment 1 and comparative example 1,2 are compared, and capability retention and the recovery rate of embodiment 1 and comparative example 2 are higher, and hence one can see that, and the gelation in hot environment of gelation barrier film is effective, makes the storge quality of battery better.
The experiment of embodiment 3 and comparative example 3 detects
In following chart, the battery that represents of the present embodiment 3 is numbered A1, A2, A3, A4, and the battery that represents of comparative example 3 is numbered B1, B2, B3, B4.
High-temperature shelf property detects: the battery of required detection is deposited after 10h in 80 ℃ of environment, detected battery capacity, internal resistance and cell thickness before depositing and after depositing.Testing result is as shown in table 4 below, the gel lithium ion battery of embodiment 3 wants high compared to lithium ion battery its capability retention, capacity restoration rate in hot environment of comparative example 3, and the thickness increment rate of its resistance Magnification and battery is less, shown that gel lithium ion battery has better electrical property and good security performance when high temperature is deposited, it has good resistance to elevated temperatures.
Table 4
Under low temperature, discharge performance detects:
Low temperature discharge detects, as shown in table 5 below, and wherein low temperature performance detects design parameter and is discharged to 2.75V for-20 ℃ of 1.0C, and the design parameter that normal temperature discharge performance detects is that 25 ℃ of 0.5C are discharged to 2.75V.
Table 5
From upper table 5, in-20 ℃ of environment, embodiment 3 and comparative example 2 are compared, and the capability retention of embodiment 3 is higher, and embodiment 3 has better large multiplying power discharging property in low temperature environment.
Comprehensive above-mentioned table 2～5, the present invention has better electrical property in hot environment, and use that can be more effective, safe also can have been given play to more excellent discharge performance in low temperature environment.
Claims (10)
1. the gel lithium ion battery that high low temperature is taken into account, comprises the positive pole that contains positive active material, the negative pole that contains negative electrode active material and be arranged on described positive pole and described negative pole between barrier film and electrolyte; It is characterized in that: described barrier film is that coating on both sides has the gel-type barrier film that comprises polyvinylidene fluoride-hexafluoropropylene, described electrolyte comprises electrolyte and solvent, described electrolyte is lithium salts, concentration is 1.0～1.2mol/L, and described solvent comprises 15%～20% ethylene carbonate, 50%～60% methyl ethyl carbonate, 8%～15% propene carbonate, 8%～15% diethyl carbonate by mass fraction.
2. the gel lithium ion battery that high low temperature according to claim 1 is taken into account, is characterized in that: described electrolyte also comprises that accounting for solvent quality mark is 1.0%～1.5% vinylene carbonate.
3. the gel lithium ion battery that high low temperature according to claim 1 is taken into account, is characterized in that: the gel layer thickness of described gel-type barrier film is 1～4 μ m.
4. the gel lithium ion battery that high low temperature according to claim 1 is taken into account, is characterized in that: described barrier film is one or more in polyethylene barrier film, polypropylene diaphragm, cellulose composite membrane.
5. the gel lithium ion battery that high low temperature according to claim 1 is taken into account, is characterized in that: described positive active material is cobalt acid lithium.
6. the gel lithium ion battery that high low temperature according to claim 1 is taken into account, is characterized in that: the granularity D of described positive active material
50be 5～15 μ m.
7. the gel lithium ion battery that high low temperature according to claim 1 is taken into account, is characterized in that: described negative electrode active material is Delanium.
8. the gel lithium ion battery that high low temperature according to claim 1 is taken into account, is characterized in that: described Delanium is soft carbon clad structure.
9. the preparation method of the gel lithium ion battery that the high low temperature as described in claim 1～8 any one is taken into account, is characterized in that, comprises the following steps:
(1) preparation of positive pole, negative pole, gel-type barrier film and electrolyte;
(2) battery combination: positive pole, barrier film and negative pole coiling are pressurizeed by heating mutually compound, then pack battery case into, subsequently battery case is toasted, inject the electrolyte into housing;
(3) change into: by production technology, change into;
(4) battery gel: after changing into, battery is placed on to 65～85 ℃ of hot pressing 3～4h, the moulding of bleeding obtains battery finished product.
10. the preparation method of the gel lithium ion battery that high low temperature is taken into account according to claim 9, is characterized in that: gelation barrier film described in described (1) be prepared as the copolymer at polyvinylidene fluoride-hexafluoropropylene described in described barrier film coating on both sides.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104037457A (en) * | 2014-06-25 | 2014-09-10 | 东莞市索菲亚电池科技有限公司 | Polymer battery packaging method |
| CN109411806A (en) * | 2018-12-11 | 2019-03-01 | 广东永邦新能源股份有限公司 | A kind of low-temperature lithium ion battery and preparation method thereof |
| CN113875060A (en) * | 2019-05-14 | 2021-12-31 | 马自达汽车株式会社 | Lithium ion secondary battery |
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