CN1005669B - Fibreglass diaphragm for lithium cell - Google Patents
Fibreglass diaphragm for lithium cell Download PDFInfo
- Publication number
- CN1005669B CN1005669B CN85108034.0A CN85108034A CN1005669B CN 1005669 B CN1005669 B CN 1005669B CN 85108034 A CN85108034 A CN 85108034A CN 1005669 B CN1005669 B CN 1005669B
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- China
- Prior art keywords
- barrier film
- glass fibre
- alkali
- film according
- fibre
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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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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Abstract
The present invention relates to a fiberglass membrane used for a lithium battery, which is composed of 0.5% to 10% of mulberry fiber, 90% to 99.5% of medium-alkali fiberglass containing zinc with the average diameter from 0.2 to 0.5 micrometer and an adhesive covering 5% to 15% of total fiber weight. The membrane has the advantages of high liquid absorption rate, small specific resistance, favorable chemical stability, higher mechanical strength, simple process, easy molding, etc. The present invention is suitable for lithium batteries and other acid batteries.
Description
The present invention is a kind of fibreglass diaphragm that plays isolation effect between both positive and negative polarity on the lithium battery that is used in.
At present, be the barrier film of main component with the glass fibre in most of in the world lithium batteries, mostly be the glass fibre that diameter surpasses 1 micron and form.For example the US4421834 patent is that 2～8 microns glass fibre is the barrier film that main component is made with regard to having proposed a kind of average diameter.This barrier film since its fibre diameter greater than 2 microns, so specific area is little, the liquid holdup of barrier film is low, makes electrolyte influence the stable discharging of battery at the inside battery skewness.
Task of the present invention provides a kind of pick up height, and is littler than resistance, and the lithium battery diaphragm of good chemical stability and higher mechanical strength is arranged.
The present invention contains the zinc glass fibre based on the middle alkali that accounts for total weight 90%～99.5%, and in this fiber, having the average fibre diameter more than 90% at least is 0.2～0.5 micron.Because it is tiny to form the fibre diameter of this barrier film.So the specific area of barrier film is big, the pick up height.This fiber belongs to 1 grade of hydrolysed grade, thereby makes barrier film have good chemical stability.
In order to increase the mechanical strength of barrier film, also selected 0.5%～10% the mulberry fibre that accounts for total weight of fiber for use, in this fiber, having the average fiber length more than 90% at least is 6～10 millimeters, this fiber is after making beating is handled, outer wall tissues breaks, and can produce a large amount of microfibres, has increased the specific area of barrier film.Because this fiber is longer, fiber adhesion is to each other increased again.Thereby improved barrier film intensity.
The binding agent of making this barrier film is the copolymer of perfluoroethylene-propylene or vinylidene and tetrafluoroethene.Its consumption is to account for 5%～15% of total weight of fiber.
In order to improve the pick up of barrier film, in forming process, also add the surfactant of the cationic or anionic that accounts for total weight of fiber 0.01%～0.5%, be beneficial to the infiltration and the absorption of electrolyte.
For further reducing cost, do not reduce membrane properties again, common medium-alkali glass fibre of the present invention also available 5%～20% replace mulberry fibre and the part in alkali contain the zinc glass fibre.The diameter of common medium-alkali glass fibre is not more than 13 microns, and average length is 6～12 millimeters.
Advantage of the present invention is, the pick up height of barrier film is littler than resistance, and good chemical stability and higher mechanical strength are arranged, and technology is simple, is easy to moulding, is applicable on lithium battery and other acid battery to use.
Technical process schematic diagram of the present invention is seen Figure of description.
Embodiments of the invention are: alkali in 380 grams is contained zinc glass fibre and 20 gram mulberry fibres, join in the fluffer that is full of purify waste water (ion exchange water) and discongest, discongesting concentration is 0.1%～0.5%, the time of discongesting is 30～45 minutes, then the slurry of discongesting is transported in the slurry storage pond with agitating device with pump, and adding is purified waste water or the recirculated water of forming part, further be diluted to about 0.01% slurry concentration, add 40 gram perfluoroethylene-propylenes (or copolymer of vinylidene and tetrafluoroethene) again, prepared slurry with after being pumped into high-order current stabilization case, flow into to copy again and get make-up machine, make the l Water Paper page or leaf, this l Water Paper page or leaf enters hot air circulation drying oven, about about 200 ℃, after dehydrating and solidifying, promptly make needed fibreglass diaphragm for lithium cell, sampling detects its performance, when thickness is 0.1 millimeter, pick up 〉=800%, than resistance≤10 ohm=centimetre, tensile strength 〉=40kg/cm
2
Claims (8)
1, fibreglass diaphragm for lithium cell, it is characterized in that: it is 6～10mm by 90% above average length, content is that 0.5%～10% mulberry fibre and 90% above average diameter are 0.2～0.5 micron, and 5%～15% binding agent that content contains the zinc glass fibre by 90%～99.5% middle alkali and accounts for total weight of fiber is formed.
2, barrier film according to claim 1 is characterized in that: binding agent is made up of 5%～15% perfluoroethylene-propylene.
3, barrier film according to claim 1 is characterized in that: binding agent also can be made up of 5%～15% the vinylidene and the copolymer of tetrafluoroethene.
4, barrier film according to claim 1 is characterized in that: this barrier film also contains the cation of 0.1%-0.5% or the surfactant of anionic.
5, barrier film according to claim 1 is characterized in that: available common medium-alkali glass fibre replaces mulberry fibre.
6, barrier film according to claim 1 is characterized in that: available 5%～20% common medium-alkali glass fibre comes that alkali contains the zinc glass fibre in the instead of part.
7, according to claim 5 or 6 described barrier films, it is characterized in that: the average diameter of common medium-alkali glass fibre is less than 13 microns, and average length is 6～12 millimeters.
8, according to the described barrier film of claim 1～6, it is characterized in that: the thickness of barrier film is 0.05～0.5 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85108034.0A CN1005669B (en) | 1985-11-04 | 1985-11-04 | Fibreglass diaphragm for lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85108034.0A CN1005669B (en) | 1985-11-04 | 1985-11-04 | Fibreglass diaphragm for lithium cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85108034A CN85108034A (en) | 1987-07-22 |
| CN1005669B true CN1005669B (en) | 1989-11-01 |
Family
ID=4795872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85108034.0A Expired CN1005669B (en) | 1985-11-04 | 1985-11-04 | Fibreglass diaphragm for lithium cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1005669B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872852B (en) * | 2010-06-21 | 2012-09-26 | 深圳昊天龙邦复合材料有限公司 | Preparation method of cell diaphragm based on aramid fiber |
| CN103700799A (en) * | 2013-12-26 | 2014-04-02 | 杭州万好万家动力电池有限公司 | Glass fiber baffle plate and lithium ion battery adopting glass fiber buffer plate |
| CN107293690B (en) * | 2017-06-12 | 2019-12-13 | 中航锂电（洛阳）有限公司 | Lithium ion battery positive electrode composite pole piece, preparation method thereof and lithium ion battery |
| CN109256515A (en) * | 2018-09-12 | 2019-01-22 | 珠海格力电器股份有限公司 | A kind of membrane configuration, lithium cell and lithium battery using the membrane configuration |
| CN113285173A (en) * | 2021-05-20 | 2021-08-20 | 东华大学 | Flame-retardant glass nanofiber composite battery diaphragm and preparation method thereof |
-
1985
- 1985-11-04 CN CN85108034.0A patent/CN1005669B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85108034A (en) | 1987-07-22 |
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