CN204216114U - A kind of composite diaphragm for lithium battery - Google Patents
A kind of composite diaphragm for lithium battery Download PDFInfo
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- CN204216114U CN204216114U CN201420681003.1U CN201420681003U CN204216114U CN 204216114 U CN204216114 U CN 204216114U CN 201420681003 U CN201420681003 U CN 201420681003U CN 204216114 U CN204216114 U CN 204216114U
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- lithium battery
- composite diaphragm
- microporous polypropylene
- stratum granulosum
- polypropylene 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
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The utility model discloses a kind of composite diaphragm for lithium battery, belong to lithium battery material field, comprise microporous polypropylene membrane, described microporous polypropylene membrane upper and lower surface is provided with polyethylene micropowder stratum granulosum and Kynoar-hexafluoropropylene micro powder granule layer all successively.The closed pore temperature of the utility model improvement barrier film and fusing-off temperature, improve the performance of barrier film.
Description
Technical field
The utility model belongs to lithium battery material field, relates to a kind of lithium battery diaphragm, particularly a kind of composite diaphragm for lithium battery.
Background technology
Lithium battery has the characteristics such as quality is light, volume is little, energy density is high, have extended cycle life, and has again safe and reliable, the advantage such as environmental protection and fast charging and discharging, has become the study hotspot of novel power supply technology in recent years.The battery core of lithium battery forms primarily of positive electrode, negative material, electrolyte and barrier film, its septation is the important component part of battery core, play the effect separating battery core positive pole and negative pole, have electronic isolation and ionic conductivity, wherein the ability of conducting lithium ions is directly connected to the overall performance of lithium battery; The performance of barrier film determines the internal resistance etc. of the interfacial structure of lithium battery, electrolytical retentivity and battery, and then affects the key characteristic such as capacity, charging and discharging currents density, cycle performance of battery.Therefore, the quality of membrane properties directly has influence on the combination property of lithium battery.
Lithium battery diaphragm requires to have lower closed pore temperature and higher fusing-off temperature usually.The microporous barrier that current most of lithium battery diaphragm adopts polyolefine material to manufacture, especially consumer lithium battery barrier film used.With regard to fail safe, microporous polyolefin film has the self-closing protective effect of micropore, making the rising of battery energy Limited Current when overcharging or temperature is too high, preventing battery short circuit from setting off an explosion.Microporous polypropylene membrane has higher closed pore temperature and higher fusing-off temperature, and polyethylene has lower fusing point, at the upper and lower two surface-coated polyethylene micropowder particles of microporous polypropylene membrane, can ensure that barrier film has lower closed pore temperature, greatly improve the security performance of lithium ion battery.
Vistanex is a kind of non-polar material, poor with the compatibility of electrolyte of strong polarity in the battery, cause between the both positive and negative polarity of the liquid lithium ionic cell generally used and barrier film and there is space, electrolyte is free in cyclic process, affects cyclicity and the fail safe of battery.And Kynoar-hexafluoropropylene fluorinated copolymer that to be polarity larger, itself and electrolyte have good compatibility, coating is it can be used as to be coated on microporous polypropylene membrane, barrier film can be made to have good swellability to electrolyte, the wettability of barrier film to electrolyte can be improved like this, bond barrier film and positive/negative plate simultaneously, improves the cycle performance of battery.
Utility model content
The purpose of this utility model is to provide a kind of by laminated diaphragm compound, the composite diaphragm for lithium battery with superperformance.
For achieving the above object, the utility model is by the following technical solutions:
A kind of composite diaphragm for lithium battery, comprise microporous polypropylene membrane, microporous polypropylene membrane upper and lower surface is provided with polyethylene micropowder stratum granulosum and Kynoar-hexafluoropropylene micro powder granule layer all successively.
The gross thickness of composite diaphragm is 9 ~ 90 μm.
The thickness of microporous polypropylene membrane is 5 ~ 60 μm, and micropore average pore size is 50 ~ 500nm.
The porosity of microporous polypropylene membrane is 20 ~ 60%.
The diameter of particle of polyethylene micropowder stratum granulosum is 100 ~ 400nm, and stratum granulosum thickness is 1 ~ 10 μm.
The porosity of polyethylene micropowder stratum granulosum is 30 ~ 80%.
The diameter of particle of Kynoar-hexafluoropropylene micro powder granule layer is 100 ~ 500nm, and stratum granulosum thickness is 1 ~ 5 μm.
The porosity of Kynoar-hexafluoropropylene micro powder granule layer is 20 ~ 80%.
The beneficial effects of the utility model are as follows:
1, adopt multilayer composite membrane, the closed pore temperature of improvement barrier film and fusing-off temperature, improve the performance of barrier film.
2, the particle diameter adopting polyethylene micropowder stratum granulosum particle is 100 ~ 400nm, porosity is 30 ~ 80%, ensures the permeability that electrolyte is stronger and lower closed pore temperature.
The particle diameter of the micro powder granule of 3, Kynoar-hexafluoropropylene micro powder granule layer is 100 ~ 500nm, porosity is 15 ~ 50%, there is good absorption, the ability keeping electrolyte and higher conductivity, can be bondd barrier film and positive/negative plate, makes barrier film and positive/negative plate not easily occur to misplace and short circuit.
Accompanying drawing explanation
Fig. 1 is cross-sectional structure schematic diagram of the present utility model;
Fig. 2 is apparent form SEM photo of the present utility model.
Embodiment
A kind of composite diaphragm for lithium battery, as shown in Figure 1, 2, comprise microporous polypropylene membrane 1, microporous polypropylene membrane 1 upper and lower surface is provided with polyethylene micropowder stratum granulosum 2 and Kynoar-hexafluoropropylene micro powder granule layer 3 all successively, also namely: polyethylene micropowder stratum granulosum 2 is located between microporous polypropylene membrane 1 and Kynoar-hexafluoropropylene micro powder granule layer 3.The gross thickness of composite diaphragm is 32.2 μm, and gas permeability is 548s/100ml; The thickness of microporous polypropylene membrane 1 is 25 μm, and micropore size is 260nm, and porosity is 43%; The diameter of particle of polyethylene micropowder stratum granulosum 2 is 300nm, and stratum granulosum thickness is 2 μm, and porosity is 50%; The diameter of particle of Kynoar-hexafluoropropylene micro powder granule layer 3 is 230nm, and stratum granulosum thickness is 1.6 μm, and porosity is 48%.
Claims (8)
1. a composite diaphragm for lithium battery, comprises microporous polypropylene membrane, it is characterized in that: described microporous polypropylene membrane upper and lower surface is provided with polyethylene micropowder stratum granulosum and Kynoar-hexafluoropropylene micro powder granule layer all successively.
2. composite diaphragm for lithium battery as claimed in claim 1, is characterized in that: the gross thickness of described composite diaphragm is 9 ~ 90 μm.
3. composite diaphragm for lithium battery as claimed in claim 1 or 2, is characterized in that: the thickness of described microporous polypropylene membrane is 5 ~ 60 μm, and micropore average pore size is 50 ~ 500nm.
4. composite diaphragm for lithium battery as claimed in claim 3, is characterized in that: the porosity of described microporous polypropylene membrane is 20 ~ 60%.
5. composite diaphragm for lithium battery as claimed in claim 1 or 2, is characterized in that: the grain size of micropowder of described polyethylene micropowder stratum granulosum is 100 ~ 400nm, and stratum granulosum thickness is 1 ~ 10 μm.
6. composite diaphragm for lithium battery as claimed in claim 5, is characterized in that: the porosity of described polyethylene micropowder stratum granulosum is 30 ~ 80%.
7. composite diaphragm for lithium battery as claimed in claim 1 or 2, is characterized in that: the diameter of particle of described Kynoar-hexafluoropropylene micro powder granule layer is 100 ~ 500nm, and stratum granulosum thickness is 1 ~ 5 μm.
8. composite diaphragm for lithium battery as claimed in claim 7, is characterized in that: the porosity of described Kynoar-hexafluoropropylene micro powder granule layer is 20 ~ 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420681003.1U CN204216114U (en) | 2014-11-14 | 2014-11-14 | A kind of composite diaphragm for lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420681003.1U CN204216114U (en) | 2014-11-14 | 2014-11-14 | A kind of composite diaphragm for lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204216114U true CN204216114U (en) | 2015-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201420681003.1U Active CN204216114U (en) | 2014-11-14 | 2014-11-14 | A kind of composite diaphragm for lithium battery |
Country Status (1)
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| CN (1) | CN204216114U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303442A (en) * | 2017-12-18 | 2018-07-20 | 合肥国轩高科动力能源有限公司 | A kind of diaphragm closed pore temperature test method |
| CN110010830A (en) * | 2019-04-23 | 2019-07-12 | 雒乙橙 | A kind of lithium battery diaphragm |
| CN111435761A (en) * | 2019-01-11 | 2020-07-21 | 中信国安盟固利动力科技有限公司 | All-solid-state lithium ion battery and hot-pressing preparation method of multilayer electrolyte membrane thereof |
| CN113078414A (en) * | 2019-12-17 | 2021-07-06 | 山东海科创新研究院有限公司 | Polypropylene composite diaphragm with low-temperature thermal closed-cell mechanism, preparation method thereof and lithium ion battery |
-
2014
- 2014-11-14 CN CN201420681003.1U patent/CN204216114U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303442A (en) * | 2017-12-18 | 2018-07-20 | 合肥国轩高科动力能源有限公司 | A kind of diaphragm closed pore temperature test method |
| CN108303442B (en) * | 2017-12-18 | 2020-08-14 | 合肥国轩高科动力能源有限公司 | Diaphragm closed pore temperature testing method |
| CN111435761A (en) * | 2019-01-11 | 2020-07-21 | 中信国安盟固利动力科技有限公司 | All-solid-state lithium ion battery and hot-pressing preparation method of multilayer electrolyte membrane thereof |
| CN111435761B (en) * | 2019-01-11 | 2021-08-10 | 荣盛盟固利新能源科技有限公司 | All-solid-state lithium ion battery and hot-pressing preparation method of multilayer electrolyte membrane thereof |
| CN110010830A (en) * | 2019-04-23 | 2019-07-12 | 雒乙橙 | A kind of lithium battery diaphragm |
| CN113078414A (en) * | 2019-12-17 | 2021-07-06 | 山东海科创新研究院有限公司 | Polypropylene composite diaphragm with low-temperature thermal closed-cell mechanism, preparation method thereof and lithium ion battery |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20211203 Granted publication date: 20150318 |
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| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20221203 Granted publication date: 20150318 |
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| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20221228 Granted publication date: 20150318 |