CN102607240B - Drying equipment and drying method for lithium ion battery electrodes - Google Patents
Drying equipment and drying method for lithium ion battery electrodes Download PDFInfo
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- CN102607240B CN102607240B CN201210056123.8A CN201210056123A CN102607240B CN 102607240 B CN102607240 B CN 102607240B CN 201210056123 A CN201210056123 A CN 201210056123A CN 102607240 B CN102607240 B CN 102607240B
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Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a drying method for lithium ion battery electrodes, which includes: placing electrodes to be dried into a drying chamber; and feeding solvent vapor into the drying chamber, wherein solvents can be at least one of water, N-methyl-2-pyrrolidone, dimethyl formamide, dimethyl sulfoxide, acetone, ethanol and ethylene glycol. By the method of feeding the solvent vapor to the electrodes in drying as compared with the prior art, surface solvent vapor pressure of the electrodes can be increased, surface solvent vaporizing rate of the electrodes can be reduced, uniformity of solvent vaporizing rates of the upper layer and the lower of each electrode can be improved, cohesiveness of membranes can be improved, and finally, qualification rate of finished electrodes is increased, battery uniformity is improved and battery recyclability is improved. In addition, the invention discloses equipment used in the method.
Description
Technical field
The invention belongs to technical field of lithium ion, relate in particular to a kind of drying equipment of electrodes of lithium-ion batteries and adopt this equipment to carry out the dry method of pole piece.
Background branch art
Lithium ion battery, owing to having the advantages such as high working voltage, high-energy-density and long circulation life, is widely used in the consumption electronic products such as mobile phone, notebook computer and digital camera.
Battery pole piece is one of main working parts of lithium ion battery, and its performance has determined the performance of lithium ion battery to a great extent.The preparation process of electrodes of lithium-ion batteries is generally: positive/negative active material, conductive agent, binding agent and solvent are mixed according to a certain percentage and be prepared into slurry, then slurry is coated on collector, heating vapors away solvent and obtains dry pole piece; Again dry pole piece is rolled to certain size, make electrode.
In pole piece preparation process, the drying means of pole piece has very important impact to the performance of pole piece.Conventional forced air drying method is to utilize electrical heating air, then uses air blast that hot-air is led to pole piece surface, and heating pole piece makes solvent evaporates, realizes the dry of pole piece.Forced air drying method makes pole piece that being dried to nexine by superficial layer occur, the pole piece bad adhesion making like this, easily there are the quality problems such as surface checking, pore, dry linting and demoulding, cause the problems such as the excellent rate of pole piece finished product battery consistency low, that prepare is poor, cycle performance is bad.Publication number is by the mode of infrared heating step by step, to be dried pole piece in the Chinese patent application of CN1851958A and CN2819486Y, the Chinese patent application that publication number is CN101639312A provide a kind of infrared-method of air blast stage drying.The dry method of infrared heating has realized diaphragm levels and has heated up simultaneously evenly, has reduced the evaporation rate of solvent difference that causes due to the upper and lower interlayer temperature difference of pole piece, has improved to a certain extent the uniformity on pole piece thickness direction, has improved the caking property of pole piece.
Yet in the evaporation rate of solvent and the temperature of slurry and slurry environment of living in, the vapour pressure of solvent is relevant in slurry.In the drying means using at present, in order to accelerate the dry of pole piece, all can utilize air blast to pass into dry air in hothouse.When mobile air is surperficial through pole piece, because vapor pressure solvent in air is very low, the evaporation rate of solvent of pole piece superficial layer is much larger than the evaporation rate of solvent in pole piece lower floor, cause between levels that rate of drying difference is large, there is the problems such as surface checking, dry linting, demoulding in pole piece bad adhesion, pole piece, has a strong impact on yield rate prepared by battery pole piece and the performance of battery.
In view of this, necessaryly provide a kind of and can reduce pole piece superficial layer evaporation rate of solvent, improve the uniformity of evaporation rate of solvent between pole piece levels, improve close-burning pole piece drying equipment and the method thereof of diaphragm.
Summary of the invention
One of object of the present invention is: for the deficiencies in the prior art, and provide a kind of pole piece superficial layer evaporation rate of solvent that can reduce, improve the uniformity of evaporation rate of solvent between pole piece levels, improve the close-burning pole piece drying means of diaphragm.
In order to reach above object, the present invention by the following technical solutions:
A kind of electrodes of lithium-ion batteries drying means, pole piece to be dried is placed in after hothouse, in hothouse, pass into solvent vapo(u)r, described solvent is at least one in water, 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), dimethyl sulfoxide (DMSO) (DMSO), acetone, ethanol and ethylene glycol, to improve the vapor pressure solvent on pole piece surface, reduce pole piece superficial layer evaporation rate of solvent, improve the uniformity of evaporation rate of solvent between pole piece levels.Described solvent is the steam of common solvent in the preparation of lithium ion battery plus-negative plate slurry.Wherein, solvent for use steam is the steam of certain component or the mixed vapour of multicomponent solvent in the steam, mixed solvent of solvent in electrodes of lithium-ion batteries spreading mass to be dried.Particularly, when the solvent in pulp of lithium ion battery is mixed solvent, the steam passing into is the steam of evaporable component in solvent, or the mixed vapour that mixed solvent is corresponding, when the steam passing into is mixed vapour, should suitably adjust each constituent content in mixed vapour according to each component evaporation rate of solvent, with high being advisable of vapor partial pressure of easy evaporated components in solvent, to realize the even evaporation of each solvent composition.
As a kind of improvement of electrodes of lithium-ion batteries drying means of the present invention, the 20%-95% that the vapour pressure of described solvent vapo(u)r is saturated vapor pressure.
As a kind of improvement of electrodes of lithium-ion batteries drying means of the present invention, the temperature of described solvent vapo(u)r is 50-150 ℃.Solvent vapo(u)r is when improving the vapor pressure solvent on pole piece surface, can be used as heat medium heats pole piece, be about to solvent vapo(u)r and be heated to uniform temperature, utilize air blast to make solvent vapo(u)r with certain flow velocity pole piece surface of flowing through, solvent vapo(u)r and pole piece generation heat exchange, make the solvent evaporation in pole piece intensification and pole piece, realize the evenly dry of pole piece.
As a kind of improvement of electrodes of lithium-ion batteries drying means of the present invention, in dry run, utilize infrared, microwave or resistance heated pole piece, can accelerate the dry of pole piece.
A kind of improvement as electrodes of lithium-ion batteries drying means of the present invention adopts stage drying in dry run, and 2-6 section is advisable, and in each dryer section, temperature is different with vapor pressure solvent, with vapor pressure solvent reduce successively, temperature first raise be reduced to afterwards suitable.
As a kind of improvement of electrodes of lithium-ion batteries drying means of the present invention, section, stage casing and three sections of rears are dry headed by described stage drying.
A kind of improvement as electrodes of lithium-ion batteries drying means of the present invention, the described first section of 60%-95% that dry vapor pressure solvent is saturated vapor pressure, temperature is 50-120 ℃, the 0%-20% that the dry vapor pressure solvent of described rear is saturated vapor pressure, and temperature is 40-90 ℃.
With respect to prior art, the present invention adopts the method for logical solvent vapo(u)r in pole piece dry run, can improve the vapor pressure solvent on pole piece surface, reduce pole piece superficial layer evaporation rate of solvent, improve the uniformity of evaporation rate of solvent between pole piece levels, improve the caking property of diaphragm, thereby it is inconsistent to have solved pole piece superficial layer and pole piece lower floor evaporation rate of solvent that electrodes of lithium-ion batteries causes because vapor pressure solvent in environment is too low in dry run, and the problems such as surface checking, dry linting and demoulding appear in the pole piece bad adhesion, the pole piece that cause.The final excellent rate of finished product, the uniformity of battery and the cycle performance of battery that improves pole piece.
Another object of the present invention is to provide a kind of electrodes of lithium-ion batteries drying equipment, comprise solvent vapo(u)r produce heating clamber, for placing the hothouse of pole piece, for solvent vapo(u)r being imported to the air inlet air blast of hothouse, for solvent vapo(u)r being derived to the gas outlet air exhauster of hothouse, and produce with solvent vapo(u)r the solvent vapo(u)r return duct that heating clamber is connected with described gas outlet air exhauster respectively.During actual production, after solvent vapo(u)r produces and heats in solvent vapo(u)r produces heating clamber, by air blast, be blown into hothouse.Pole piece to be dried moves right, under the effect of temperature flowing solvent vapo(u)r, temperature raises, and the solvent in pole piece evenly evaporates, and through the air exhauster of exhaust outlet, extracts out, by solvent vapo(u)r return duct, get back to solvent vapo(u)r and produce heating clamber, thereby realize the recovery of solvent in dry, the steam of diaphragm.
A kind of improvement as electrodes of lithium-ion batteries drying equipment of the present invention, in described hothouse, be also provided with thermometer and hygrometer, temperature and humidity with in monitoring hothouse, when temperature and humidity is not in suitable scope, can regulate the blast velocity of air inlet air blast.
A kind of improvement as electrodes of lithium-ion batteries drying equipment of the present invention, is provided with infrared emittance, microwave generator or resistance wire in described hothouse, thereby accelerates the dry of pole piece.
With respect to prior art, in electrodes of lithium-ion batteries drying equipment of the present invention, added solvent vapo(u)r to produce heating clamber, by solvent vapo(u)r, produce the solvent vapo(u)r producing in heating clamber and be dried pole piece, can improve the vapor pressure solvent on pole piece surface, reduce pole piece superficial layer evaporation rate of solvent, improve the uniformity of evaporation rate of solvent between pole piece levels, improve the caking property of diaphragm.And, from exhaust outlet solvent vapo(u)r out, can also return solvent vapo(u)r by solvent vapo(u)r return line flow and produce heating clamber, reach the object that reclaims solvent vapo(u)r, avoid waste, cost-saving.
Accompanying drawing explanation
Fig. 1 is the structural representation of electrodes of lithium-ion batteries drying equipment of the present invention;
Fig. 2 is the structural representation of the another kind of electrodes of lithium-ion batteries drying equipment of the present invention.
The specific embodiment
Following examples are further explanation of the present invention, and the present invention is not formed to any restriction.
As shown in Figure 1, electrodes of lithium-ion batteries drying equipment of the present invention, comprise solvent vapo(u)r produce heating clamber 1, for placing the hothouse 3 of pole piece 4, for solvent vapo(u)r being imported to the air inlet air blast 2 of hothouse 3, for solvent vapo(u)r being derived to the gas outlet air exhauster 7 of hothouse 3, and produce with solvent vapo(u)r the solvent vapo(u)r return duct 8 that heating clamber 1 is connected with described gas outlet air exhauster 7 respectively.
Wherein, in described hothouse 3, be also provided with thermometer 5 and hygrometer 6.
As shown in Figure 2, in described hothouse 3, infrared emittance 9 is installed, certainly, in hothouse 3, also microwave generator or resistance wire can be installed.
During actual production, after solvent vapo(u)r produces and heats in solvent vapo(u)r produces heating clamber 1, by air inlet air blast 2, be blown into hothouse 3.In the process that pole piece 4 to be dried moves right, under the effect of temperature flowing solvent vapo(u)r, temperature raises (meanwhile, infrared emittance 9 grades also can heat to pole piece), solvent in pole piece evenly evaporates, through exhaust outlet air exhauster 7, extract out, by solvent vapo(u)r return duct 8, get back to solvent vapo(u)r and produce heating clamber 7, thereby realize the recovery of solvent in dry, the steam of diaphragm.
With specific embodiment, illustrate and adopt electrodes of lithium-ion batteries drying equipment of the present invention to carry out dry method to pole piece below:
Embodiment 1
By Delanium, superconduction carbon (Super P), butadiene-styrene rubber (SBR), sodium carboxymethylcellulose (CMC) 2200 with distilled water by 94: 3: 1.5: the mass ratio of 1.5: 120 is evenly mixed with into cathode size, cathode size is evenly coated on the Copper Foil of 8 micron thickness, the solid weight on Copper Foil is about 8mg/cm
2.
Then above-mentioned pole piece is put into the hothouse 3 of the electrodes of lithium-ion batteries drying equipment shown in Fig. 1, wherein pole piece is 1m/s through the speed of hothouse 3.Solvent vapo(u)r adopts steam, and the temperature of water vapour is 85 ± 5 ℃, and it is 60% that the relative humidity in hothouse 3 is controlled.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as A1;
Embodiment 2
As described in Example 1, pole piece drying parameter is for pole piece preparation and pole piece drying equipment: pole piece is 1m/s through the speed of hothouse 3, and the temperature of water vapour is 110 ± 5 ℃, and in hothouse 3, relative humidity is 60%.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as A2;
Embodiment 3
As described in Example 1, pole piece drying parameter is for pole piece preparation and pole piece drying equipment: pole piece is 1m/s through the speed of hothouse, and the temperature of water vapour is 130 ± 5 ℃, and in hothouse 3, relative humidity is 60%.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as A3;
Embodiment 4
Pole piece preparation as described in Example 1, utilizes the pole piece drying device shown in Fig. 2 to be dried pole piece.Wherein, the temperature of pole piece hothouse 3 is 85 ± 5 ℃, and in hothouse 3, relative humidity is 60%.Pole piece is 1m/s by the speed of hothouse 3.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as B1;
Embodiment 5
Pole piece preparation and pole piece drying equipment are as embodiment 4, and pole piece drying parameter is: the temperature of pole piece hothouse 3 is 110 ± 5 ℃, and in hothouse 3, relative humidity control is 60%.Pole piece is 1m/s by the speed of hothouse 3.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as B2;
Embodiment 6
Pole piece preparation and pole piece drying equipment are as embodiment 4, and pole piece drying parameter is: the temperature of pole piece hothouse 3 is 130 ± 5 ℃, and in hothouse 3, relative humidity control is 60%, and pole piece is 1m/s by the speed of hothouse 3.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as B3;
Embodiment 7
Pole piece preparation as described in Example 1, adopts the dry method of infrared heating multistage to be dried.Wherein pole piece is 1m/s through the speed of hothouse 3, first section of hothouse 3 temperature are 85 ℃, relative humidity is 70%, secondary segment hothouse 3 temperature are 110 ℃, and relative humidity is that 50%, the three section of hothouse 3 temperature is 110 ℃, it is 30% that relative humidity is controlled, the 4th section is conventional forced air drying, and the temperature that blasts dry air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as C1;
Embodiment 8
Distilled water and ethanol are mixed as mixed solvent by the volume ratio of 8: 2; By Delanium, Super P, SBR, CMC with mixed solvent in 94: 3: 1.5: the ratio of 1.5: 120 is evenly mixed with into cathode size, cathode size is evenly coated on the Copper Foil of 8 micron thickness, and the solid weight on Copper Foil is about 8mg/cm
2.
Utilize the device shown in Fig. 2 to be dried the cathode pole piece of preparation.Pole piece is 1m/s through the speed of hothouse 3.In pole piece hothouse 3, temperature is 85 ± 5 ℃, in hothouse 3, passes into alcohol vapour, and wherein in hothouse 3, alcohol vapour pressure is controlled at 75% of saturated vapor pressure.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as D1;
Embodiment 9
The preparation of pole piece and drying device are as described in Example 8.Pole piece is 1m/s through the speed of hothouse 3.In pole piece hothouse 3, temperature is 85 ± 5 ℃, and toward the mixed vapour that passes into ethanol and distilled water in hothouse 3, wherein in hothouse 3, relative humidity is controlled at 60%, and alcohol vapour pressure is controlled at 75% of saturated vapor pressure.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as D2;
Embodiment 10
By LiCoO
2, Super P, PVDF with NMP in 94: 3: 3: 30 ratio is evenly mixed with into anode sizing agent, anode sizing agent is evenly coated on the aluminium foil of 14 micron thickness, and the solid weight on aluminium foil is about 16mg/cm
2.
Utilize the device shown in Fig. 2 to be dried the anode pole piece of preparation.Wherein pole piece is 1.5m/s through the speed of hothouse 3.In hothouse 3, temperature is 85 ± 5 ℃, and it is 60% left and right of saturated vapor pressure that NMP vapour pressure is controlled.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as E1;
Embodiment 11
As described in Example 10, wherein pole piece is 1.5m/s through the speed of hothouse 3 for anode pole piece preparation and drying device.In hothouse 3, temperature is 110 ± 5 ℃, and it is 60% left and right of saturated vapor pressure that NMP vapour pressure is controlled.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as E2;
Embodiment 12
As described in Example 10, wherein pole piece is 1.5m/s through the speed of hothouse 3 for anode pole piece preparation and drying device.In hothouse 3, temperature is 130 ± 5 ℃, and it is 60% left and right of saturated vapor pressure that NMP vapour pressure is controlled.After this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts dry air is 60 ± 5 ℃, the dry pole piece obtaining is designated as E3;
Embodiment 13
Pole piece preparation as described in Example 10, adopts the dry method of multistage to be dried.Wherein pole piece is 1.5m/s through the speed of hothouse 3, first section of hothouse 3 temperature are 60 ℃, NMP vapour pressure is controlled as 75% of saturated vapor pressure, secondary segment hothouse 3 temperature are 110 ℃, and 50%, the three section of hothouse 3 temperature that NMP vapour pressure is controlled as saturated vapor pressure are 110 ℃, it is 30% that the saturation degree of NMP steam is controlled, the 4th section is conventional forced air drying, and the temperature that blasts air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as E4;
Comparative example 1
Pole piece preparation, as embodiment 1, adopts forced air drying method to be dried pole piece.The gas wherein blasting is air, and the temperature of air is 85 ± 5 ℃, and pole piece is 1m/s through the speed of pole piece hothouse, after this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as R1;
Comparative example 2
Pole piece preparation, as embodiment 1, adopts forced air drying method to be dried pole piece.The gas wherein blasting is air, and the temperature of air is 110 ± 5 ℃, and pole piece is 1m/s through the speed of pole piece hothouse, after this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as R2;
Comparative example 3
Pole piece preparation, as embodiment 1, adopts infrared heating+forced air drying method to be dried pole piece.The gas wherein blasting is air, and the temperature of hothouse is 85 ± 5 ℃, and pole piece is 1m/s through the speed of pole piece hothouse, after this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as R3;
Comparative example 4
Pole piece preparation, as embodiment 1, adopts infrared heating+forced air drying method to be dried pole piece.The gas wherein blasting is air, and the temperature of hothouse is 110 ± 5 ℃, and pole piece is 1m/s through the speed of pole piece hothouse, after this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as R4;
Comparative example 5
Pole piece preparation, as embodiment 8, adopts infrared heating+forced air drying method to be dried pole piece.The gas wherein blasting is air, and the temperature of hothouse is 85 ± 5 ℃, and pole piece is 1m/s through the speed of pole piece hothouse, after this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as R5;
Comparative example 6
Pole piece preparation, as embodiment 10, adopts infrared heating+forced air drying method to be dried pole piece.The gas wherein blasting is air, and the temperature of hothouse is 85 ± 5 ℃, and pole piece is 1.5m/s through the speed of pole piece hothouse, after this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as R6.
Comparative example 7
Pole piece preparation, as embodiment 10, adopts infrared heating+forced air drying method to be dried pole piece.The gas wherein blasting is air, and the temperature of hothouse is 110 ± 5 ℃, and pole piece is 1.5m/s through the speed of pole piece hothouse, after this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as R7.
Comparative example 8
Pole piece preparation, as embodiment 10, adopts infrared heating+forced air drying method to be dried pole piece.The gas wherein blasting is air, and the temperature of hothouse is 130 ± 5 ℃, and pole piece is 1.5m/s through the speed of pole piece hothouse, after this section is dry, recycle conventional forced air drying method pole piece is dried, the temperature that wherein blasts air is 60 ± 5 ℃, and the dry pole piece obtaining is designated as R8.
Dried cathode pole piece is carried out to visualization, add up it and prepare excellent rate, acquired results is shown in table 1.
In addition, pole piece surface after seeing drying can be found, use the method for forced air drying and infrared+forced air drying, when baking temperature is 110 ℃, there is significantly be full of cracks in pole piece surface, and after drying means in employing the present invention, even if baking temperature reaches 130 ℃, can not chap in pole piece surface yet.Adopt after drying means of the present invention, other defect that cause due to bad adhesion on pole piece surface also obviously reduces as dry linting, demoulding.
Performance test:
Dry cathode pole piece is carried out to cohesive force test, concrete method of testing is: the Copper Foil on pole piece and diaphragm are bonded at respectively on two fixtures, control clamp movement diaphragm is peeled off from Copper Foil, the maximum pull in record film stripping process, this pulling force is the cohesive force of diaphragm.The width of the diaphragm of wherein peeling off is 25mm, and length is 80mm, and the test result of bonding force is shown in table 1.
The cohesive force of table 1, cathode pole piece and excellent rate measurement result
| Sample | Drying mode | Baking temperature (℃) | Cohesive force (N) | Negative pole is prepared excellent rate |
| A1 | Water vapour is dry | 85±5 | 0.174-0.177 | 95.2％ |
| A2 | Water vapour is dry | 110±5 | 0.172-0.178 | 95.0％ |
| A3 | Water vapour is dry | 130±5 | 0.163-0.169 | 93.8％ |
| B1 | Infrared+water vapour | 85±5 | 0.181-0.187 | 96.3％ |
| B2 | Infrared+water vapour | 110±5 | 0.173-0.180 | 95.7％ |
| B3 | Infrared+water vapour | 130±5 | 0.169-0.175 | 94.4％ |
| C1 | Multistage is dry | Segmentation | 0.190-0.192 | 97.1％ |
| D1 | Infrared+alcohol vapour | 85±5 | 0.172-0.177 | 94.6％ |
| D2 | Infrared+mixed vapour | 85±5 | 0.179-0.185 | 95.0％ |
| R1 | Forced air drying | 85±5 | 0.158-0.160 | 91.4％ |
| R2 | Forced air drying | 110±5 | 0.139-0.144 | 89.7％ |
| R3 | Infrared+forced air drying | 85±5 | 0.164-0.171 | 94.1％ |
| R4 | Infrared+forced air drying | 110±5 | 0.155-0.158 | 91.0％ |
| R5 | Infrared+forced air drying | 85±5 | 0.135-0.141 | 88.6％ |
As shown in Table 1, adopt the drying means in the present invention, effectively improved the cohesive force of diaphragm, the excellent rate of preparation of pole piece is obviously promoted.
Dry anode pole piece is carried out to the test of pole piece cohesive force, and method of testing is identical with cathode pole piece cohesive force method of testing.Add up in addition the mass loss of anode pole piece colding pressing, in itemize and winding process, test result is as shown in table 2.
Mass loss measurement result in table 2, anode pole piece cohesive force and preparation process
| Sample | Drying mode | Baking temperature (℃) | Cohesive force (N) | Anodal mass loss |
| E1 | Infrared+NMP steam | 85±5 | 0.338-0.345 | 0.08％ |
| E2 | Infrared+NMP steam | 110±5 | 0.329-0.337 | 0.11％ |
| E3 | Infrared+NMP steam | 130±5 | 0.311-0.317 | 0.25％ |
| E4 | Stage drying | Segmentation | 0.350-0.355 | 0.03％ |
| R6 | Infra-red drying | 85±5 | 0.313-0.321 | 0.17％ |
| R7 | Infra-red drying | 110±5 | 0.297-0.308 | 0.30％ |
| R8 | Infra-red drying | 130±5 | 0.277-0.285 | 0.56％ |
By table 2, can be seen, adopt after drying means of the present invention, the caking property of pole piece has obtained significant raising, and the mass loss of pole piece in preparation process obviously reduces.
In sum, adopt equipment of the present invention and method can improve the vapor pressure solvent on pole piece surface, reduce pole piece superficial layer evaporation rate of solvent, improve the uniformity of evaporation rate of solvent between pole piece levels, improve the caking property of diaphragm, finally improve the excellent rate of finished product, the uniformity of battery and the cycle performance of battery of pole piece.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned embodiment.Therefore, the present invention is not limited to the specific embodiment disclosed and described above, to modifications and changes more of the present invention, also should fall in the protection domain of claim of the present invention.In addition,, although used some specific terms in this description, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (8)
1. an electrodes of lithium-ion batteries drying means, it is characterized in that: pole piece to be dried is placed in after hothouse, in hothouse, pass into solvent vapo(u)r, described solvent is at least one in water, 1-METHYLPYRROLIDONE (NMP), dimethyl formamide (DMF), dimethyl sulfoxide (DMSO) (DMSO), acetone, ethanol and ethylene glycol, the vapour pressure of described solvent vapo(u)r is 20%-95% of saturated vapor pressure, and the temperature of described solvent vapo(u)r is 50-150 ℃.
2. electrodes of lithium-ion batteries drying means according to claim 1, is characterized in that: in dry run, utilize infrared, microwave or resistance heated pole piece.
3. electrodes of lithium-ion batteries drying means according to claim 1, is characterized in that: in dry run, adopt stage drying.
4. electrodes of lithium-ion batteries drying means according to claim 3, is characterized in that: headed by described stage drying, section, stage casing and three sections of rears are dry.
5. electrodes of lithium-ion batteries drying means according to claim 4, is characterized in that: the described first section of 60%-95% that dry vapor pressure solvent is saturated vapor pressure, and temperature is 50-120 ℃; The 0%-20% that the dry vapor pressure solvent of described rear is saturated vapor pressure, temperature is 40-90 ℃.
6. an electrodes of lithium-ion batteries drying equipment, it is characterized in that: comprise solvent vapo(u)r produce heating clamber, for placing the hothouse of pole piece, for solvent vapo(u)r being imported to the air inlet air blast of hothouse, for solvent vapo(u)r being derived to the gas outlet air exhauster of hothouse, and produce with solvent vapo(u)r the solvent vapo(u)r return duct that heating clamber is connected with described gas outlet air exhauster respectively.
7. electrodes of lithium-ion batteries drying equipment according to claim 6, is characterized in that: in described hothouse, be also provided with thermometer and hygrometer.
8. electrodes of lithium-ion batteries drying equipment according to claim 6, is characterized in that: infrared emittance, microwave generator or resistance wire are installed in described hothouse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210056123.8A CN102607240B (en) | 2012-03-06 | 2012-03-06 | Drying equipment and drying method for lithium ion battery electrodes |
Applications Claiming Priority (1)
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| CN102969483A (en) * | 2012-12-13 | 2013-03-13 | 中国电子科技集团公司第十八研究所 | Preparation method of thick electrode with low solid-content slurry of lithium ion battery |
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