CN101958409A - Lithium battery isolation membrane and lithium battery using same - Google Patents
Lithium battery isolation membrane and lithium battery using same Download PDFInfo
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- CN101958409A CN101958409A CN2010102897598A CN201010289759A CN101958409A CN 101958409 A CN101958409 A CN 101958409A CN 2010102897598 A CN2010102897598 A CN 2010102897598A CN 201010289759 A CN201010289759 A CN 201010289759A CN 101958409 A CN101958409 A CN 101958409A
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- isolation membrane
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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
Abstract
The invention discloses a lithium battery isolation membrane and a lithium battery using the same. The thickness of the isolation membrane is 15 to 30 microns, the porosity is 47 to 58 percent, the air permeability is 60 to 220S/cc, and the average aperture is 0.15 to 0.25 micron. The isolation membrane is favorable for high-amplification discharge of the lithium battery. The conventional lithium battery can achieve good high-amplification discharge effect only by adopting the isolation membrane, does not need complex process improvement, has low cost and convenient operation, and is favorable for large-scale popularization.
Description
Technical field
The present invention relates to technical field of lithium batteries, relate in particular to a kind of lithium battery that is suitable for the lithium battery isolation membrane of high-multiplying power discharge and uses this barrier film.
Background technology
Lithium battery is the high energy storage device of a kind of specific energy.It is stable to have discharge voltage, and operating temperature range is wide, and self-discharge rate is low, cycle charge-discharge, and storage life is long, memory-less effect and advantage such as nuisanceless.At present, along with the application of lithium ion battery more and more widely, different user is also inequality to the requirement of lithium ion battery.With lithium ion battery this field, more and more higher to the pursuit of multiplying power discharging (heavy-current discharge) at model, according to technology at present, the high-discharge-rate of lithium ion battery that is used for this field is approximately 50C～60C.This technology still is difficult to satisfy the user to powerful pursuit.
As the significant components that influences battery performance, the effect of lithium battery isolation membrane can not be ignored.The composition of barrier film mainly is monolayer polyethylene or single-layer polypropylene, or polyethylene and polyacrylic composite material.In the lithium battery the inside, barrier film mainly plays electronic isolation and ion conducting effect.
Electronics is passed through from the external circuit by collector in discharge process, and lithium ion moves between both positive and negative polarity by barrier film.Obviously, barrier film is a big resistance of lithium ion battery heavy-current discharge, so the ion ducting capacity of optimizing barrier film is useful for the lithium ion battery heavy-current discharge performance.
Lithium electricity circle does not also really find the barrier film of this suitable heavy-current discharge at present.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of lithium battery isolation membrane of suitable lithium ion heavy-current discharge is provided.
Another object of the present invention is to provide a kind of lithium battery that uses above-mentioned lithium battery isolation membrane.
At above-mentioned purpose of the present invention, the inventor mainly starts with from these four main performances of thickness, porosity, air permeability and aperture of barrier film, carries out correspondingly conceptual design and experimental data optimization, specific as follows shown in:
Gas permeability is an important indicator of barrier film, and the unobstructed property that the good more then lithium ion of gas permeability sees through barrier film is good more, and barrier film resistance is low more.Gas permeability is by the pore size of film and each combined factors decision such as distribution, porosity, the shape in hole and the tortuosity in hole.Tortuosity is low, thin thickness, the aperture is big and the high good permeability that all means of porosity, and barrier film resistance is low.
Concerning barrier film, porosity is not high more good more, and porosity is high more, and its mechanical property just will be affected.
If the aperture of barrier film is too little, then to pass ability too little for lithium ion, can't realize the high-multiplying power discharge of lithium battery.The needs of lithium ion battery heavy-current discharge generally in 0.01～0.1 mu m range, can't be satisfied in its aperture of existing barrier film.The aperture of barrier film greatly then ionic resistance is little, and lithium ion moves between both positive and negative polarity easily, thereby promotes the lithium battery multiplying power discharging property.
Therefore, the present invention studies by thickness, porosity, air permeability and aperture to barrier film, finally obtains realizing the lithium battery isolation membrane performance index of high-multiplying power discharge:
The thickness of barrier film is selected 15～30um, porosity ranges 47%～58%, and air permeability scope 60～220S/cc, the average pore size scope is 0.15～0.25um.
In addition, the inventor has also carried out optimization experiment to above-mentioned data, found that: the thickness 20um～25um of barrier film, porosity selects 50%～55%, air permeability is selected 150～200S/cc, and average pore size is 0.15～0.20um, can obtain better experiment effect.
Replace the barrier film that has lithium battery now with barrier film of the present invention, preparation gained lithium battery, through experimental verification, under identical design condition, the continuous discharge electric current of lithium ion battery can be promoted to 85C by 50C, and effect is quite obvious.
This shows that barrier film of the present invention has been realized the purpose of lithium battery high-multiplying power discharge.
Compared with prior art, the present invention has following beneficial effect:
1. thickness, porosity, air permeability and aperture are several key factors of decision barrier film ionic resistance, and the present invention studies by experiment and optimizes, and obtains one group of barrier film performance data that helps the lithium battery high-multiplying power discharge;
2. the present invention adopts wide-aperture barrier film, and ionic resistance is little, thereby helps lithium ion moving between both positive and negative polarity, promotes multiplying power discharging property;
3. existing lithium battery only need adopt barrier film of the present invention, just can obtain good high-multiplying power discharge effect, need not complicated process modification, and cost is low, and is easy to operate, helps large-scale promotion.
Description of drawings
Fig. 1 is the discharge-rate curve chart of embodiment 1 existing lithium battery;
Wherein, 1 is the 55C electric current, and 2 is the 50C electric current, and 3 is the 45C electric current, and 4 is the 40C electric current, and 5 is the 35C electric current;
Fig. 2 is the discharge-rate curve chart of embodiment 2 lithium batteries of the present invention;
Wherein, 1 is the 85C electric current, and 2 is the 80C electric current, and 3 is the 75C electric current, and 4 is the 70C electric current, and 5 is the 65C electric current, and 6 is the 60C electric current, and 7 is the 55C electric current, and 8 is the 50C electric current, and 9 is the 45C electric current, and 10 is the 40C electric current, and 11 is the 35C electric current;
Fig. 3 is embodiment 1 and embodiment 2 discharge curve comparison diagram under the 45C electric current;
Wherein, 1 is the lithium battery of embodiment 1, and 2 is the lithium battery of embodiment 2.
Embodiment
Below in conjunction with specific embodiment the present invention is done description further, but specific embodiment is not done any qualification to the present invention.
Get existing lithium battery, its barrier film thickness, porosity, air permeability and aperture are as shown in table 1.
With the barrier film of barrier film alternative embodiment 1 lithium battery of the present invention, its parameter of barrier film of the present invention is as shown in table 1, and all the other are all with embodiment 1.
The performance parameter of barrier film among table 1 embodiment
| Barrier film | Thickness | Porosity | Air permeability | The |
| Embodiment | ||||
| 1 | 20um | 44％ | 300 | 0.13um |
| |
25um | 55％ | 200 | 0.20um |
Measure the discharge-rate situation of embodiment 1 lithium battery and embodiment 2 lithium batteries, the result respectively as depicted in figs. 1 and 2.
As can be seen from Figure 1, the barrier film of existing lithium battery can not regular picture under the 55C electric current, and among Fig. 2 as can be seen, adopt the lithium battery behind the barrier film of the present invention under the 55C electric current, also to have very high percent of volume.
As can be seen from Figure 2, adopt barrier film of the present invention after, lithium battery can be promoted to maximum discharge current more than the 85C, effect is very obvious.
With the lithium battery of embodiment 1 and embodiment 2, under identical discharging current situation, carry out the comparison of discharge scenario, the result is as shown in Figure 3.As can be seen from Figure 3, under identical discharging current situation, be example with the 45C discharge, the platform voltage difference of two kinds of barrier films is very big, the existing barrier film 45C discharge platform of embodiment 1 is 3.36V, and the barrier film 45C discharge platform of the present invention of embodiment 2 reaches 3.50V, has promoted 140mV.
In sum, barrier film of the present invention can play the effect of high-multiplying power discharge really, and effect is obvious.
Claims (4)
1. lithium battery isolation membrane, the thickness that it is characterized in that described barrier film is 15～30um, and porosity is 47%～58%, and air permeability is 60～220S/cc, and average pore size is 0.15～0.25um.
2. according to the described lithium battery isolation membrane of claim 1, the thickness that it is characterized in that described barrier film is 20～25um, and porosity is 50%～55%, and air permeability is 150～200S/cc, and average pore size is 0.15～0.20um.
3. lithium battery, comprise housing and place housing interior positive pole, negative pole, electrolyte and barrier film, the thickness that it is characterized in that described barrier film is 15～30um, and porosity is 47%～58%, air permeability is 60～220S/cc, and average pore size is 0.15～0.25um.
4. according to the described lithium battery of claim 3, the thickness that it is characterized in that described barrier film is 20～25um, and porosity is 50%～55%, and air permeability is 150～200S/cc, and average pore size is 0.15～0.20um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102897598A CN101958409A (en) | 2010-09-20 | 2010-09-20 | Lithium battery isolation membrane and lithium battery using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102897598A CN101958409A (en) | 2010-09-20 | 2010-09-20 | Lithium battery isolation membrane and lithium battery using same |
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| CN101958409A true CN101958409A (en) | 2011-01-26 |
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| CN2010102897598A Pending CN101958409A (en) | 2010-09-20 | 2010-09-20 | Lithium battery isolation membrane and lithium battery using same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409674A (en) * | 2014-12-08 | 2015-03-11 | 清华大学 | Composite diaphragm material and preparation method and application thereof |
| WO2018201264A1 (en) | 2017-05-04 | 2018-11-08 | 李朝晖 | Reinforced membrane for separation in battery and preparation method therefor |
| CN114696040A (en) * | 2022-06-01 | 2022-07-01 | 沧州明珠隔膜科技有限公司 | Lithium ion battery diaphragm and preparation method and application thereof |
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| CN101393976A (en) * | 2007-09-19 | 2009-03-25 | 比亚迪股份有限公司 | Battery separator, fabrication method thereof |
| CN101462381A (en) * | 2009-01-06 | 2009-06-24 | 韩伟嘉 | Polyolefin micropore barrier diaphragm and method for producing the same |
| CN101809783A (en) * | 2007-09-27 | 2010-08-18 | 三洋电机株式会社 | Separator for nonaqueous electrolyte battery and nonaqueous electrolyte battery |
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| CN101393976A (en) * | 2007-09-19 | 2009-03-25 | 比亚迪股份有限公司 | Battery separator, fabrication method thereof |
| CN101809783A (en) * | 2007-09-27 | 2010-08-18 | 三洋电机株式会社 | Separator for nonaqueous electrolyte battery and nonaqueous electrolyte battery |
| CN101462381A (en) * | 2009-01-06 | 2009-06-24 | 韩伟嘉 | Polyolefin micropore barrier diaphragm and method for producing the same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104409674A (en) * | 2014-12-08 | 2015-03-11 | 清华大学 | Composite diaphragm material and preparation method and application thereof |
| WO2018201264A1 (en) | 2017-05-04 | 2018-11-08 | 李朝晖 | Reinforced membrane for separation in battery and preparation method therefor |
| CN114696040A (en) * | 2022-06-01 | 2022-07-01 | 沧州明珠隔膜科技有限公司 | Lithium ion battery diaphragm and preparation method and application thereof |
| CN114696040B (en) * | 2022-06-01 | 2022-08-30 | 沧州明珠隔膜科技有限公司 | Lithium ion battery diaphragm and preparation method and application thereof |
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Application publication date: 20110126 |