CN102655229A - Pore-forming method for diaphragms of lithium ion batteries - Google Patents
Pore-forming method for diaphragms of lithium ion batteries Download PDFInfo
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- CN102655229A CN102655229A CN2012100781933A CN201210078193A CN102655229A CN 102655229 A CN102655229 A CN 102655229A CN 2012100781933 A CN2012100781933 A CN 2012100781933A CN 201210078193 A CN201210078193 A CN 201210078193A CN 102655229 A CN102655229 A CN 102655229A
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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
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a pore-forming method for diaphragms of lithium ion batteries. The method comprises the following steps: fully dissolving a pore-forming agent into a solvent so as to prepare a pore-forming agent solution; uniformly coating the pore-forming agent solution on the surface of a to-be-cold-pressed diaphragm, and carrying out baking on the diaphragm at a temperature lower than the sublimation or decomposition temperature of the pore-forming agent, so that a solvent of the pore-forming agent solution is volatilized, and the pore-forming agent is recrystallized in the diaphragm; and carrying out cold pressing on the diaphragm, and then carrying out baking on the diaphragm at a temperature higher than the sublimation or decomposition temperature of the pore-forming agent, so that the pore-forming agent recrystallized in the diaphragm is sublimated or decomposed, thereby obtaining a porous diaphragm. According to the invention, through regulating the viscosity of the pore-forming agent solution, a diaphragm with adjustably-distributed pores can be obtained, and the regulating method is simple and flexible, and wide in applicable range; and particularly, according to the invention, an efficient gradient pore distribution structure that more pores are distributed on the surface layer of the diaphragm and less pores are distributed on the inner layer of the diaphragm can be realized just through selecting an appropriate viscosity of the pore-forming agent solution..
Description
Technical field
The invention belongs to technical field of lithium ion, particularly a kind of pore forming method of lithium ion battery diaphragm.
Background technology
Since the extensive commercialization of lithium ion battery, rely on the advantage of its high-energy-density, high power density, in portable electronics such as laptop computer, video camera, mobile communication, obtain widespread usage.Yet along with the continual renovation of consumer electronics product design and constantly broadening of application demand scope, its requirement to battery performance (like charge-discharge performance fast, good cryogenic property) also improves constantly.
Such as the people in the industry knowledge, the quick conducting of two passages of battery system is depended in the raising of battery performance: ion channel and electron channel.For the quick conducting of ion channel, key is the vesicular structure in the electrode diaphragm.Vesicular structure is good, and electrolyte just can fully soak into each particle in the diaphragm apace; In charge and discharge process, lithium ion just can soak into network conducting fast between positive and negative electrode through this electrolyte, shows good electrical properties.
For the regulation and control of the vesicular structure of electrode diaphragm, it mainly is to realize through control compacted density size that industry is produced.But this method can only realize that the integral body change of diaphragm mesopore density is big or diminish, and the reduction compacted density can cause electric core energy density to reduce.Diaphragm is colded pressing and can be caused also that the top layer pore size distribution is few, the bottom pore size distribution is many, and this is a vesicular structure that is unfavorable for electrolyte and the quick conducting of ion, because the flow maximum of diffusion of top layer electrolyte and ions diffusion, the laminar flow amount is more little more inward.So it is the few more structures of many, the more past bottom pore size distributions of top layer pore size distribution that general hope obtains, such hole structure can guarantee the quick conducting of fully soaking into fast of electrolyte and ion; And such hole structure occupation space is minimum, can provide maximum spaces to improve electric core energy density to active material.
Based on patent and literature survey, some other method that can regulate hole structure of electrode diaphragm mainly contains adds these two kinds of pore creating material port-creating method and diaphragm punch methods in the slurry.The former can affect to formula of size selection and pulping process because will pore creating material be added this highstrung metastable system of slurry; And if manufacturing hole, top layer is many, this vesicular structure is efficiently lacked in the nexine hole, and the method need prepare the slurry of different pore creating material concentration and carry out multi-layer coated could the realization, and this is the very complicated process of an operation.The diaphragm punch method mainly is that the method through machinery/physics produces specific hole structure in diaphragm, will cause machinery/physical damage to the active material in the diaphragm in the method implementation process, causes the reduction of electric core energy density; And be difficult in the method short time realize on a large scale, produce in batches efficiently, in addition, the diaphragm punch method also need use expensive precision instrument and equipment.
In view of this, necessaryly provide a kind of and can produce that pore size distribution in the diaphragm is adjustable, operation implement simple, to the friendly pore forming method that does not have the lithium ion battery diaphragm that destroys, can mass production in the short time of diaphragm active material.
Summary of the invention
The objective of the invention is to: to the deficiency of prior art, and provide a kind of and can produce that pore size distribution in the diaphragm is adjustable, operation implement simple, to the friendly pore forming method that does not have the lithium ion battery diaphragm that destroys, can mass production in the short time of diaphragm active material.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of pore forming method of lithium ion battery diaphragm may further comprise the steps:
Step 1 is chosen required pore creating material and corresponding solvent, pore creating material fully is dissolved in the pore creating material solution solvent by required proportioning according to the requirement to pore creating material solution concentration and viscosity, is uniformly dispersed, and prepares pore creating material solution;
Step 2; The pore creating material solution that step 1 is obtained is coated in membrane surface to be colded pressing equably; Pore creating material solution is penetrated into diaphragm inside through existing hole in the diaphragm; Under the temperature that is lower than pore creating material distillation or decomposes, diaphragm is toasted, make the volatilization of pore creating material solution solvent, pore creating material is at the inner recrystallization of diaphragm and occupy certain aperture position;
Step 3 is colded pressing to diaphragm, under the temperature that is higher than pore creating material distillation or decomposes, toasts then, makes in the pore creating material distillation of the inner recrystallization of diaphragm or decomposes, thereby in diaphragm, stay hole, obtains porous membrane.
As a kind of improvement of lithium ion battery diaphragm pore forming method of the present invention, said pore creating material is benzoic acid, oxalic acid and at least a in the ball how.These materials have ambient stable, but the characteristics that heating is prone to distillation or decomposes.
As a kind of improvement of lithium ion battery diaphragm pore forming method of the present invention, said solvent is at least a in n-formyl sarcolysine base pyrrolidones (NMP), acetone, ethanol or the water.These solvents can fully dissolve pore creating material.
As a kind of improvement of lithium ion battery diaphragm pore forming method of the present invention, the viscosity of said solvent is 1mPas～1000mPas.The osmotic resistance of high viscosity pore creating material solution in diaphragm is big, mainly is distributed in the diaphragm top layer; Low viscous pore creating material solution, the osmotic resistance in diaphragm is little, all is penetrated into the diaphragm bottom very soon; The pore creating material solution of proper viscosity, the osmotic resistance in diaphragm is suitable, can uniformly penetrating in whole diaphragm.
As a kind of improvement of lithium ion battery diaphragm pore forming method of the present invention, the viscosity of said solvent is 300mPas～1000mPas, and to be the hole, top layer many to prepare diaphragm, the distribution that the nexine hole is few.
As a kind of improvement of lithium ion battery diaphragm pore forming method of the present invention, the concentration of said pore creating material solution is 0.1mol/L～10mol/L.Pore creating material solution concentration design demand is considered the requirement of pore creating material solution viscosity and pore-creating volume simultaneously, under the prerequisite that guarantees pore size distribution gradient on the diaphragm thickness direction, reaches the requirement to the pore-creating volume.
As a kind of improvement of lithium ion battery diaphragm pore forming method of the present invention, said pore creating material solution is coated on the diaphragm through the mode of spraying, brushing, dip-coating or extrusion coated.
As a kind of improvement of lithium ion battery diaphragm pore forming method of the present invention, the temperature of the said baking of step 3 is smaller or equal to 180 ℃, to avoid that the bonding agent in the diaphragm is caused burn-in effects.
As a kind of improvement of lithium ion battery diaphragm pore forming method of the present invention, the said baking of step 3 is a vacuum bakeout, and vacuum degree is higher than-80KPas, to avoid the oxidation of bonding agent in oxidation of diaphragm collector and the diaphragm as far as possible.
As a kind of improvement of lithium ion battery diaphragm pore forming method of the present invention, diaphragm said to be colded pressing is anodal diaphragm and/or cathode membrane.
Compared with prior art, the present invention has following advantage at least:
The first, the adding of pore creating material realizes through being coated with pore creating material solution the back well in preparing diaphragm among the present invention, does not relate to the pulping process responsive to pore creating material, formula of size is not had restricted;
The second, the present invention can access the adjustable diaphragm of pore size distribution through regulating the viscosity of pore creating material solution, and the control method simple and flexible is applied widely; Special; For realizing the hole structure of the Gradient distribution that hole, diaphragm top layer is many, the nexine hole is few; The present invention need not to prepare the slurry of different pore creating material concentration; Also need not to carry out multi-layer coated, only need through selecting suitable pore creating material solution viscosity (realizing) to realize at an easy rate through selecting different pore creating material solution solvent and the different pore creating material solution concentration of selection.
The 3rd; Compare normal electric core production process; The present invention realizes simply, only need between diaphragm painting process and diaphragm cold pressing process, increase the process (and pore creating material distillation/decomposition can merge to completion together in the diaphragm vacuum process of colding pressing normally) that is coated with pore creating material solution and baking volatilization pore creating material solution solvent together.So the present invention can realize mass production at short notice to the not influence basically of current battery production process efficiency.
The 4th, the inventive method can not destroyed the active material in the pole piece, can not impact the capacity of battery; And this pore-creating is with low cost, need not to buy expensive accurate punch device.
Embodiment
Below in conjunction with the pore forming method of specific embodiment detailed description lithium ion battery diaphragm of the present invention, still, embodiments of the invention are not limited thereto.
Embodiment 1
Get 0.1mol benzoic acid powder and fully be dissolved in 1L n-formyl sarcolysine base pyrrolidones (NMP) solvent, prepare the pore creating material solution of 0.1mol/L, the pore creating material solution viscosity is 1mPas.Get graphite cathode diaphragm coated, before colding pressing, adopt spraying process evenly to be coated with last layer pore creating material solution on its surface.Because the pore creating material solution viscosity is very low, diaphragm is very little to the osmotic resistance of pore creating material solution, and most of pore creating material solution will be penetrated into the diaphragm bottom.The diaphragm that is coated with pore creating material solution is carried out 85 ℃ of bakings 10 minutes, NMP is fully volatilized, benzoic acid solute crystallization and occupy certain position again simultaneously at diaphragm bottom hole place.Then, to implanted the benzoic acid crystal diaphragm cold pressing; Then to the good diaphragm of colding pressing in 110 ℃ of vacuum bakeout 6h (vacuum degree-99Kpa); In the bake process, the distillation of benzoic acid crystal becomes gas and from diaphragm, spins off, thereby in diaphragm, stays a series of hole.Because the pore creating material solution major part of spraying has been penetrated into the diaphragm bottom, so what made among this embodiment is that the bottom hole is many, the hole structure that the hole, top layer is few.
Embodiment 2
Get 1mol oxalic acid powder and fully be dissolved in the 1L pure water solvent, prepare the pore creating material solution of 1mol/L, the pore creating material solution viscosity is 100mPas.Get lithium cobaltate cathode diaphragm coated, before colding pressing, adopt spread coating evenly to be coated with last layer pore creating material solution on its surface.Because the pore creating material solution viscosity is moderate, only there is suitable resistance in diaphragm to the infiltration of pore creating material solution, and pore creating material solution is inner to diaphragm with uniformly penetrating.The diaphragm that is coated with pore creating material solution is carried out 100 ℃ of bakings 15 minutes, aqueous solvent is fully volatilized, oxalic acid solute crystallization and occupy certain position again simultaneously at diaphragm bottom hole place.Then, to implanted the oxalic acid crystal diaphragm cold pressing; Then to the good diaphragm of colding pressing in 110 ℃ of vacuum bakeout 6h (vacuum degree-99Kpa); In the bake process, the distillation of oxalic acid crystal becomes gas and from diaphragm, spins off, thereby in diaphragm, stays a series of hole.Because it is inner that the pore creating material solution uniformly penetrating of brushing has arrived diaphragm, so what made among this embodiment is equally distributed hole structure on the diaphragm thickness direction.
Embodiment 3
How the ball powder fully is dissolved in the 1L alcohol solvent to get 10mol, prepares the pore creating material solution of 10mol/L, and the pore creating material solution viscosity is 900mPas.Get iron phosphate lithium positive pole diaphragm coated, before colding pressing, adopt the extrusion coated method evenly to be coated with last layer pore creating material solution on its surface.Because the pore creating material solution viscosity is high, diaphragm is very big to the osmotic resistance of pore creating material solution, has only a small amount of pore creating material solution porous to the diaphragm bottom.The diaphragm that is coated with pore creating material solution is carried out 45 ℃ of bakings 10 minutes, ethanol is fully volatilized, ball solute crystallization and occupy certain position again simultaneously how at diaphragm bottom hole place.Then, to implanted ball crystal how diaphragm cold pressing; Then to the good diaphragm of colding pressing in 110 ℃ of vacuum bakeout 6h (vacuum degree-99Kpa); In the bake process, how the distillation of ball crystal becomes gas spins off from diaphragm, thereby in diaphragm, stays a series of hole.Because the pore creating material solution of extrusion coated has only few part to be penetrated into the diaphragm bottom, so what made among this embodiment is that the hole, top layer is many, the hole structure that the bottom hole is few.
Embodiment 4
Get 10mol benzoic acid powder and fully be dissolved in 1L n-formyl sarcolysine base pyrrolidones (NMP) solvent, prepare the pore creating material solution of 10mol/L, the pore creating material solution viscosity is 1000mPas.Get lithium titanate anode diaphragm coated, before colding pressing, adopt dip coating evenly to be coated with last layer pore creating material solution on its surface.Because the pore creating material solution viscosity is very high, diaphragm is very big to the osmotic resistance of pore creating material solution, has only fraction pore creating material solution will be penetrated into the diaphragm bottom.The diaphragm that is coated with pore creating material solution is carried out 85 ℃ of bakings 10 minutes, NMP is fully volatilized, benzoic acid solute crystallization and occupy certain position again simultaneously at diaphragm bottom hole place.Then, to implanted the benzoic acid crystal diaphragm cold pressing; Then to the good diaphragm of colding pressing in 110 degree vacuum bakeout 6h (vacuum degree-99Kpa); In the bake process, the distillation of benzoic acid crystal becomes gas and from diaphragm, spins off, thereby in diaphragm, stays a series of hole.Because the pore creating material solution of spraying has only fraction to be penetrated into the diaphragm bottom, so what made among this embodiment is that the bottom hole is few, the hole structure that the hole, top layer is many.
Embodiment 5
How the ball powder fully is dissolved in the 1L acetone solvent to get 5mol, prepares the pore creating material solution of 5mol/L, and the pore creating material solution viscosity is 500mPas.Get silicon alloy cathode membrane coated, before colding pressing, adopt spread coating evenly to be coated with last layer pore creating material solution on its surface.Because the pore creating material solution viscosity is higher, diaphragm is bigger to the osmotic resistance of pore creating material solution, has only fraction pore creating material solution will be penetrated into the diaphragm bottom.The diaphragm that is coated with pore creating material solution is carried out 85 ℃ of bakings 10 minutes, acetone is fully volatilized, ball solute crystallization and occupy certain position again simultaneously how at diaphragm bottom hole place.Then, to implanted ball crystal how diaphragm cold pressing; Then to the good diaphragm of colding pressing in 110 ℃ of vacuum bakeout 6h (vacuum degree-85Kpa); In the bake process, how the distillation of ball crystal becomes gas spins off from diaphragm, thereby in diaphragm, stays a series of hole.Because the pore creating material solution of spraying has only fraction to be penetrated into the diaphragm bottom, so what made among this embodiment is that the bottom hole is few, the hole structure that the hole, top layer is many.
Embodiment 6
Get 7mol benzoic acid powder and fully be dissolved in the 1L acetone solvent, prepare the pore creating material solution of 7mol/L, the pore creating material solution viscosity is 700mPas.Get lithium manganate cathode diaphragm coated, before colding pressing, adopt spraying process evenly to be coated with last layer pore creating material solution on its surface.Because the pore creating material solution viscosity is than higher, diaphragm is bigger to the osmotic resistance of pore creating material solution, has only fraction pore creating material solution will be penetrated into the diaphragm bottom.The diaphragm that is coated with pore creating material solution is carried out 85 ℃ of bakings 10 minutes, acetone is fully volatilized, benzoic acid solute crystallization and occupy certain position again simultaneously at diaphragm bottom hole place.Then, to implanted the benzoic acid crystal diaphragm cold pressing; Then to cold pressing good diaphragm 110 ℃ of vacuum bakeout 6h (vacuum degree for-110Kpa); In the bake process, the distillation of benzoic acid crystal becomes gas and from diaphragm, spins off, thereby in diaphragm, stays a series of hole.Because the pore creating material solution of spraying has only fraction to be penetrated into the diaphragm bottom, so what made among this embodiment is that the bottom hole is few, the hole structure that the hole, top layer is many.
Embodiment 7
Get 3mol oxalic acid powder and fully be dissolved in the 1L aqueous solvent, prepare the pore creating material solution of 3mol/L, the pore creating material solution viscosity is 300mPas.Get lithium nickelate positive pole diaphragm coated, that cold pressing preceding, adopt spraying process evenly to be coated with last layer pore creating material solution on its surface.Because the pore creating material solution viscosity is than higher, diaphragm is bigger to the osmotic resistance of pore creating material solution, has only fraction pore creating material solution will be penetrated into the diaphragm bottom.The diaphragm that is coated with pore creating material solution is carried out 85 ℃ of bakings 10 minutes, water is fully volatilized, oxalic acid solute crystallization and occupy certain position again simultaneously at diaphragm bottom hole place.Then, to implanted the oxalic acid crystal diaphragm cold pressing; Then to cold pressing good diaphragm 110 ℃ of vacuum bakeout 6h (vacuum degree for-105Kpa); In the bake process, the distillation of oxalic acid crystal becomes gas and from diaphragm, spins off, thereby in diaphragm, stays a series of hole.Because the pore creating material solution of spraying has only fraction to be penetrated into the diaphragm bottom, so what made among this embodiment is that the bottom hole is few, the hole structure that the hole, top layer is many.
Embodiment 8
Get 1mol oxalic acid powder and fully be dissolved in the 1L alcohol solvent, prepare the pore creating material solution of 1mol/L, the pore creating material solution viscosity is 50mPas.Get graphite cathode diaphragm coated, before colding pressing, adopt spraying process evenly to be coated with last layer pore creating material solution on its surface.Because the pore creating material solution viscosity is very low, diaphragm is very little to the osmotic resistance of pore creating material solution, and most of pore creating material solution will be penetrated into the diaphragm bottom.The diaphragm that is coated with pore creating material solution is carried out 85 ℃ of bakings 10 minutes, ethanol is fully volatilized, oxalic acid solute crystallization and occupy certain position again simultaneously at diaphragm bottom hole place.Then, to implanted the oxalic acid crystal diaphragm cold pressing; Then to cold pressing good diaphragm 110 ℃ of vacuum bakeout 6h (vacuum degree for-102Kpa); In the bake process, the distillation of oxalic acid crystal becomes gas and from diaphragm, spins off, thereby in diaphragm, stays a series of hole.Because the pore creating material solution major part of spraying has been penetrated into the diaphragm bottom, so what made among this embodiment is that the bottom hole is many, the hole structure that the hole, top layer is few.
In sum; Be coated with the solution of pore creating material on the membrane surface before the present invention is employed in and colds pressing, treat to cold pressing behind the complete recrystallization of pore creating material the diaphragm after this is colded pressing through heat treatment more afterwards; Make the pore creating material distillation perhaps decompose, thereby in diaphragm, produce the pore-creating effect; Through the viscosity of pore creating material solution is controlled; Can regulate of the osmotic resistance of pore-creating diaphragm easily to pore creating material solution; Thereby regulate the implantation amount of pore creating material, finally obtain hole structure along diaphragm thickness direction different distributions trend at diaphragm different depth place.
The present invention can access the adjustable diaphragm of pore size distribution through regulating the viscosity of pore creating material solution, and the control method simple and flexible is applied widely; Special; For realizing the hole structure of the Gradient distribution that hole, diaphragm top layer is many, the nexine hole is few; The present invention need not to prepare the slurry of different pore creating material concentration; Also need not to carry out multi-layer coated, only need through selecting suitable pore creating material solution viscosity (realizing) to realize at an easy rate through selecting different pore creating material solution solvent and the different pore creating material solution concentration of selection.The hole structure of the Gradient distribution that hole, diaphragm top layer is many, the nexine hole is few can guarantee the quick conducting of fully soaking into fast of electrolyte and ion; And such hole structure occupation space is minimum, can provide maximum spaces to improve electric core energy density to active material.
In addition; Compare normal electric core production process; The present invention realizes simply, only need between diaphragm painting process and diaphragm cold pressing process, increase the process (and pore creating material distillation/decomposition can merge to completion together in the diaphragm vacuum process of colding pressing normally) that is coated with pore creating material solution and baking volatilization pore creating material solution solvent together.So the present invention can realize mass production at short notice to the not influence basically of current battery production process efficiency.
Need to prove that according to the announcement and the elaboration of above-mentioned specification, those skilled in the art in the invention can also change and revise above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should be in the protection range of claim of the present invention to equivalent modifications more of the present invention and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (10)
1. the pore forming method of a lithium ion battery diaphragm is characterized in that, may further comprise the steps:
Step 1 fully is dissolved in pore creating material in the solvent, prepares pore creating material solution;
Step 2, the pore creating material solution that step 1 is obtained is coated in membrane surface to be colded pressing equably, under the temperature that is lower than the pore creating material distillation or decomposes, diaphragm is toasted, and makes the volatilization of pore creating material solution solvent, pore creating material at the inner recrystallization of diaphragm;
Step 3 is colded pressing to diaphragm, under the temperature that is higher than pore creating material distillation or decomposes, toasts then, makes in the pore creating material distillation of the inner recrystallization of diaphragm or decomposes, and obtains porous membrane.
2. lithium ion battery diaphragm pore forming method according to claim 1 is characterized in that: said pore creating material is benzoic acid, oxalic acid and at least a in the ball how.
3. lithium ion battery diaphragm pore forming method according to claim 1 is characterized in that: said solvent is at least a in n-formyl sarcolysine base pyrrolidones (NMP), acetone, ethanol or the water.
4. lithium ion battery diaphragm pore forming method according to claim 1 is characterized in that: the viscosity of said solvent is 1mPas～1000mPas.
5. lithium ion battery diaphragm pore forming method according to claim 1 is characterized in that: the concentration of said pore creating material solution is 0.1mol/L～10mol/L.
6. lithium ion battery diaphragm pore forming method according to claim 4 is characterized in that: the viscosity of said solvent is 300mPas～1000mPas.
7. lithium ion battery diaphragm pore forming method according to claim 1 is characterized in that: said pore creating material solution is coated on the diaphragm through the mode of spraying, brushing, dip-coating or extrusion coated.
8. lithium ion battery diaphragm pore forming method according to claim 1, it is characterized in that: the temperature of the said baking of step 3 is smaller or equal to 180 ℃.
9. lithium ion battery diaphragm pore forming method according to claim 1 is characterized in that: the said baking of step 3 is a vacuum bakeout, and vacuum degree is higher than-80KPas.
10. lithium ion battery diaphragm pore forming method according to claim 1 is characterized in that: diaphragm said to be colded pressing is anodal diaphragm and/or cathode membrane.
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| CN201210078193.3A CN102655229B (en) | 2012-03-19 | 2012-03-19 | Pore-forming method for diaphragms of lithium ion batteries |
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| CN201210078193.3A CN102655229B (en) | 2012-03-19 | 2012-03-19 | Pore-forming method for diaphragms of lithium ion batteries |
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| CN104157827A (en) * | 2013-05-14 | 2014-11-19 | 深圳华粤宝电池有限公司 | Lithium ion battery negative film and preparation method thereof |
| CN109167020A (en) * | 2018-09-11 | 2019-01-08 | 天津市捷威动力工业有限公司 | A kind of preparation method and lithium ion battery of the porous lithium ion pole piece with high-energy density |
| CN110729494A (en) * | 2019-10-30 | 2020-01-24 | 无锡威孚高科技集团股份有限公司 | Catalyst slurry for proton exchange membrane fuel cell and preparation method thereof |
| CN111244395A (en) * | 2020-01-22 | 2020-06-05 | 苏州易来科得科技有限公司 | Lithium ion pole piece, preparation method thereof and lithium ion battery |
| CN111900338A (en) * | 2020-09-15 | 2020-11-06 | 天津市捷威动力工业有限公司 | Preparation method of high-power thick electrode |
| CN111900306A (en) * | 2020-07-13 | 2020-11-06 | 江苏可兰素环保科技有限公司 | High-energy-density lithium battery diaphragm and preparation method thereof |
| CN113972373A (en) * | 2021-10-08 | 2022-01-25 | 浙江超恒动力科技有限公司 | Preparation method of lithium iron phosphate pole piece and lithium ion battery |
| EP4261925A1 (en) | 2022-04-12 | 2023-10-18 | REPT BATTERO Energy Co., Ltd. | Current collector having pore-forming functional coating layer, electrode sheet and battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104157827A (en) * | 2013-05-14 | 2014-11-19 | 深圳华粤宝电池有限公司 | Lithium ion battery negative film and preparation method thereof |
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| CN109167020B (en) * | 2018-09-11 | 2021-03-30 | 天津市捷威动力工业有限公司 | Porous lithium ion pole piece with high energy density, preparation method thereof and lithium ion battery |
| CN110729494A (en) * | 2019-10-30 | 2020-01-24 | 无锡威孚高科技集团股份有限公司 | Catalyst slurry for proton exchange membrane fuel cell and preparation method thereof |
| CN111244395A (en) * | 2020-01-22 | 2020-06-05 | 苏州易来科得科技有限公司 | Lithium ion pole piece, preparation method thereof and lithium ion battery |
| CN111900306A (en) * | 2020-07-13 | 2020-11-06 | 江苏可兰素环保科技有限公司 | High-energy-density lithium battery diaphragm and preparation method thereof |
| CN111900338A (en) * | 2020-09-15 | 2020-11-06 | 天津市捷威动力工业有限公司 | Preparation method of high-power thick electrode |
| CN113972373A (en) * | 2021-10-08 | 2022-01-25 | 浙江超恒动力科技有限公司 | Preparation method of lithium iron phosphate pole piece and lithium ion battery |
| EP4261925A1 (en) | 2022-04-12 | 2023-10-18 | REPT BATTERO Energy Co., Ltd. | Current collector having pore-forming functional coating layer, electrode sheet and battery |
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