JPH0136231B2 - - Google Patents
Info
- Publication number
- JPH0136231B2 JPH0136231B2 JP56025793A JP2579381A JPH0136231B2 JP H0136231 B2 JPH0136231 B2 JP H0136231B2 JP 56025793 A JP56025793 A JP 56025793A JP 2579381 A JP2579381 A JP 2579381A JP H0136231 B2 JPH0136231 B2 JP H0136231B2
- Authority
- JP
- Japan
- Prior art keywords
- nonwoven fabric
- polypropylene
- fibers
- polyethylene
- electrolyte
- 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
Links
- -1 polypropylene Polymers 0.000 claims description 33
- 239000000835 fiber Substances 0.000 claims description 29
- 239000004745 nonwoven fabric Substances 0.000 claims description 28
- 239000004743 Polypropylene Substances 0.000 claims description 19
- 229920001155 polypropylene Polymers 0.000 claims description 19
- 239000000178 monomer Substances 0.000 claims description 12
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 9
- 229920002554 vinyl polymer Polymers 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 229920013716 polyethylene resin Polymers 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000007334 copolymerization reaction Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000003792 electrolyte Substances 0.000 description 13
- 239000004698 Polyethylene Substances 0.000 description 12
- 229920000573 polyethylene Polymers 0.000 description 12
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 7
- 238000010559 graft polymerization reaction Methods 0.000 description 7
- 239000004094 surface-active agent Substances 0.000 description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 6
- 229910001882 dioxygen Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000009736 wetting Methods 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 4
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000005865 ionizing radiation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 description 1
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- IMBKASBLAKCLEM-UHFFFAOYSA-L ferrous ammonium sulfate (anhydrous) Chemical compound [NH4+].[NH4+].[Fe+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O IMBKASBLAKCLEM-UHFFFAOYSA-L 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000006277 sulfonation reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
-
- 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
Description
【発明の詳細な説明】
本発明は電池用セパレータに関するもので、ポ
リプロピレン樹脂繊維表面にポリエチレン樹脂を
配置した繊維からなる不織布に酸又は塩基と反応
して直接或は間接に塩を形成し得るビニルモノマ
ーをグラフト共重合させて、親水性をもたせるこ
とを特徴とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separator for batteries, in which a nonwoven fabric made of fibers in which polypropylene resin fibers are arranged with polyethylene resin is coated with vinyl that can directly or indirectly form salts by reacting with acids or bases. It is characterized by graft copolymerization of monomers to impart hydrophilic properties.
従来、電池、例えばニツケル−カドミウム電池
にはセパレータとして合成樹脂からなる不織布を
使用しているが、これら合成樹脂からなる不織布
には適度の機械的強度、良好なガス透過性、電解
液保持能力、電解液耐久性及び耐酸化性が要求さ
れる。ナイロン繊維からなる不織布は親水性があ
り、電解液保持能力に優れているが、電解液耐久
性、耐酸化性に乏しく、充放電サイクルが繰り返
されるうちにナイロンが分解し、電解液中に溶解
し、アンモニア、亜硝酸イオン、硝酸イオンの酸
化還元反応により自己放電の原因となる。 Conventionally, nonwoven fabrics made of synthetic resin have been used as separators in batteries, such as nickel-cadmium batteries, but these nonwoven fabrics made of synthetic resin have moderate mechanical strength, good gas permeability, electrolyte retention ability, Electrolyte durability and oxidation resistance are required. Nonwoven fabrics made of nylon fibers are hydrophilic and have excellent electrolyte retention ability, but they lack electrolyte durability and oxidation resistance, and the nylon decomposes and dissolves in the electrolyte during repeated charge/discharge cycles. However, redox reactions of ammonia, nitrite ions, and nitrate ions cause self-discharge.
ポリプロピレン、ポリエチレンなどの繊維から
なる不織布は電解液耐久性、耐酸化性に優れてい
るが、疏水性であるため電解液保持能力に乏し
い。そのため電解液との濡れを良くするため、界
面活性剤での処理をあらかじめ行なつて使用され
ている。これらの界面活性剤で処理された不織布
の初期の濡れは、繊維表面に界面活性剤が存在す
るために良好であるが、一担電解液と接触すると
繊維表面の界面活性剤は電解液に溶解して離脱す
る。このため初期の濡れは良好であるが、繊維自
体の濡れの能力は減少する。電解液が制限された
電池ではセパレータの濡れが悪くなると電解液が
下方に偏在し、電池内部抵抗が増加して電池容量
が減少する。 Nonwoven fabrics made of fibers such as polypropylene and polyethylene have excellent electrolyte durability and oxidation resistance, but are hydrophobic and therefore have poor electrolyte retention ability. Therefore, in order to improve wetting with the electrolyte, they are treated with a surfactant before use. The initial wetting of nonwoven fabrics treated with these surfactants is good due to the presence of the surfactant on the fiber surface, but upon contact with a monovalent electrolyte, the surfactant on the fiber surface dissolves in the electrolyte. and leave. Therefore, although the initial wetting is good, the wetting ability of the fiber itself is reduced. In a battery with limited electrolyte, if the separator becomes poorly wetted, the electrolyte will be unevenly distributed downward, increasing the internal resistance of the battery and reducing the battery capacity.
また密閉型アルカリ電池では充電中に発生した
酸素ガスが陰極で吸収されることにより密閉状態
を維持している。その際、発生した酸素ガスはセ
パレータの不織布の孔を通過し陰極に到達する
が、酸素ガスが通過する際、不織布繊維と電解液
との界面に酸素ガスが侵入し、濡れが悪いと酸素
ガスは移動しなくなり、電池の内部抵抗が増加す
るという欠点を生じる。一般に酸素ガスの透過性
は親水性繊維からなる不織布と疎水性のものとで
は前者の方がはるかにガス透過性にすぐれてい
る。 In addition, in a sealed alkaline battery, oxygen gas generated during charging is absorbed by the cathode, thereby maintaining the sealed state. At this time, the generated oxygen gas passes through the pores of the nonwoven fabric of the separator and reaches the cathode, but when the oxygen gas passes through, the oxygen gas enters the interface between the nonwoven fabric fibers and the electrolyte, and if the wetting is poor, oxygen gas does not move, resulting in the drawback that the internal resistance of the battery increases. In general, nonwoven fabrics made of hydrophilic fibers and hydrophobic fabrics have much better oxygen gas permeability than nonwoven fabrics made of hydrophilic fibers.
本発明は上記従来の欠点を除去するもので、半
永久的に親水性を保持することができるセパレー
タを提供するものである。 The present invention eliminates the above-mentioned conventional drawbacks and provides a separator that can maintain hydrophilicity semi-permanently.
ポリプロピレンはポリエチレンに比べてビニル
モノマーのグラフト重合速度は非常に遅いため、
ポリプロピレンからなる不織布の繊維表面に均一
にグラフト重合することはむずかしい。またグラ
フト重合速度が遅いため時間を要し高価になる。
ポリエチレンはポリプロピレンに比べて柔らかく
腰がない。そのためポリエチレン繊維からなる不
織布は、剛性がなく電池組立作業に適していない
し、またポリエチレンではポリプロピレンに比べ
て細い繊維径の不織布は製造できず、太い繊維径
の不織布では保液性に乏しくなる。 Polypropylene has a much slower graft polymerization rate of vinyl monomers than polyethylene, so
It is difficult to perform graft polymerization uniformly on the fiber surface of a nonwoven fabric made of polypropylene. Furthermore, since the graft polymerization rate is slow, it is time consuming and expensive.
Polyethylene is softer and less stiff than polypropylene. Therefore, nonwoven fabrics made of polyethylene fibers lack rigidity and are not suitable for battery assembly work, and polyethylene cannot be used to produce nonwoven fabrics with thinner fiber diameters than polypropylene, and nonwoven fabrics with thicker fiber diameters have poor liquid retention properties.
本発明者はポリプロピレン樹脂をコアーとし
て、その周囲にポリエチレン樹脂が鞘状に被覆さ
れた繊維からなる不織布を基材として用い、親水
性を有するモノマーをグラフト重合することによ
り安価で、電池用セパレータとして適した親水性
不織布が得られることを見い出した。ポリプロピ
レン繊維表面にポリエチレンを配置するのは押し
出し法など通常の方法が利用でき、例えばチツソ
(株)よりES繊維として市販されている。ポリプロ
ピレン繊維表面の全面にポリエチレンがあつても
その一部分ポリエチレンがある場合でも本発明は
達成される。 The present inventor used a nonwoven fabric made of fibers with a polypropylene resin core and a polyethylene resin sheath-like coating around the core as a base material, and graft-polymerized a hydrophilic monomer, thereby making it inexpensive and useful as a separator for batteries. It has been found that a suitable hydrophilic nonwoven fabric can be obtained. Conventional methods such as extrusion can be used to place polyethylene on the surface of polypropylene fibers.
It is commercially available as ES fiber from Co., Ltd. The present invention can be achieved even when polyethylene is present on the entire surface of the polypropylene fiber or when polyethylene is partially present on the surface of the polypropylene fiber.
グラフト重合させるビニルモノマーとしてはア
クリル酸、メタクリル酸およびこれらのエステル
類、ビニルピリジン、ビニルピロリドン、スチレ
ンスルホン酸、スチレンなど直接に酸または塩基
と反応して塩を形成しうる官能基を有するもの、
或はグラフト共重合せしめた後に加水分解し、ス
ルホン化などの処理により塩を形成しうる官能基
をもつことができるもの、その他の親水性を有す
るモノマーが用いられる。基材、不織布にビニル
モノマーをグラフト重合する方法としては、(1)不
織布とビニルモノマーを共に重合開始剤を用いて
加熱して行なう化学法、(2)不織布とビニルモノマ
ーを接触させた状態で紫外線、電離性放射線を照
射してグラフト重合させる同時照射法、(3)不織布
に紫外線、電離性放射線を照射し、次いでビニル
モノマーと接触させてグラフト重合させる前照射
法、などにより行なうことができる。 Vinyl monomers to be graft polymerized include acrylic acid, methacrylic acid and their esters, vinyl pyridine, vinyl pyrrolidone, styrene sulfonic acid, styrene, etc., which have a functional group that can directly react with an acid or base to form a salt;
Alternatively, monomers that can be hydrolyzed after graft copolymerization and have a functional group capable of forming a salt through treatment such as sulfonation or other hydrophilic monomers are used. Methods for graft polymerizing a vinyl monomer onto a base material or nonwoven fabric include (1) a chemical method in which the nonwoven fabric and the vinyl monomer are heated together using a polymerization initiator, and (2) a chemical method in which the nonwoven fabric and the vinyl monomer are brought into contact with each other. This can be carried out by a simultaneous irradiation method in which the nonwoven fabric is irradiated with ultraviolet rays and ionizing radiation to undergo graft polymerization, (3) a pre-irradiation method in which the nonwoven fabric is irradiated with ultraviolet rays and ionizing radiation, and then brought into contact with a vinyl monomer to undergo graft polymerization. .
特に前照射法はビニルモノマーが放射線などに
照射されないため、単独重合物の生成がなく有利
であり、また放射線の照射は不活性ガスおよび空
気中でも行なうことができる。 In particular, the pre-irradiation method is advantageous because the vinyl monomer is not irradiated with radiation, and no homopolymer is produced, and the irradiation with radiation can also be carried out in an inert gas or in air.
以下、実施例により本発明を詳細に説明する。 Hereinafter, the present invention will be explained in detail with reference to Examples.
実施例
ポリプロピレン樹脂及びポリエチレン樹脂を同
心円状に２室になつた熔融ポツトに入れる。外側
の室には熔融ポリエチレンを入れ、内側の室には
溶融ポリプロピレンを入れる。熔融ポツトは下部
にノズル孔を有し、このノズルは内室ノズルを外
室ノズルが取り囲む形状である。各々の熔融樹脂
を同時に押し出すことにより、中心コアーがポリ
プロピレンのその周囲に鞘状にポリエチレンが被
覆された形態となりこれを冷却させて繊維とす
る。Example Polypropylene resin and polyethylene resin are placed concentrically in a melting pot with two chambers. The outer chamber contains molten polyethylene and the inner chamber contains molten polypropylene. The melting pot has a nozzle hole in its lower part, and this nozzle has a shape in which an inner nozzle is surrounded by an outer nozzle. By extruding each of the molten resins at the same time, the central core becomes a polypropylene coated with polyethylene in the form of a sheath, and is cooled to form a fiber.
繊維径２〜３デニールのポリプロピレン繊維表
面に押し出し法によりポリエチレンを付けた繊維
からなる厚さ250μ、目付70ｇ／m2よりなる不織
布に加速電圧2MeV、ビーム電流10ｍＡにて電子
線を空気中にて10Mrad照射した。この照射した
不織布をあらかじめ窒素ガスにより脱酸素され
た、アクリル酸50重量部、水50重量部、モール塩
0.5重量部よりなる溶液中に、速度12ｍ／Hrにて
10分間連続的に浸漬する。次に未反応のアクリル
酸を洗浄後、乾燥する。この構成している単繊維
をとりだし、カチオン性の染料で染色したところ
均一に染色でき、繊維表面がアクリル酸によりグ
ラフト重合されていることがわかる。一方、ポリ
プロピレンのみからなる不織布に同一の条件でグ
ラフト重合し、単繊維を染色したところ、全く染
色されず、グラフト重合されていないことがわか
つた。更にアクリル酸溶液への浸漬時間を50分間
にして、上記と同様に単繊維を染色してもまだら
に染色され、均一なグラフト重合がされていない
ことがわかつた。 An electron beam was irradiated in the air with an accelerating voltage of 2 MeV and a beam current of 10 mA onto a nonwoven fabric made of polypropylene fibers with a fiber diameter of 2 to 3 deniers and polyethylene applied to the surface by an extrusion method, with a thickness of 250 μm and a basis weight of 70 g/m 2 . It was irradiated with 10 Mrad. This irradiated nonwoven fabric was previously deoxidized with nitrogen gas, 50 parts by weight of acrylic acid, 50 parts by weight of water, and Mohr's salt.
In a solution consisting of 0.5 parts by weight at a speed of 12 m/Hr.
Soak continuously for 10 minutes. Next, unreacted acrylic acid is washed away and then dried. When the constituent single fibers were taken out and dyed with a cationic dye, they were uniformly dyed, indicating that the fiber surface had been graft-polymerized with acrylic acid. On the other hand, when a nonwoven fabric made only of polypropylene was graft-polymerized under the same conditions and the single fibers were dyed, no dyeing occurred, indicating that no graft polymerization had occurred. Furthermore, even when the single fibers were immersed in the acrylic acid solution for 50 minutes and dyed in the same manner as above, they were dyed in spots and it was found that uniform graft polymerization was not carried out.
本実施例によるセパレータを20AHのニツケル
−カドミウム電池に10セル組み込み、放電電流
0.2Cにて終止電圧1.0Vの放電と、充電々流0.1Cに
て150％の充電を行なう充放電サイクル寿命（初
期電池容量の60％以下になつた時点を寿命とす
る）試験を実施した。その結果、平均580サイク
ルであつた。 The separator according to this example was incorporated into 10 cells of a 20AH nickel-cadmium battery, and the discharge current was
A charge/discharge cycle life test (life is defined as the point at which the battery reaches 60% of the initial battery capacity) was conducted by discharging at a final voltage of 1.0V at 0.2C and charging to 150% at a charging current of 0.1C. . As a result, the average cycle was 580.
比較のために、ポリプロピレン繊維からなる不
織布に界面活性剤処理をしたもの(A)、ポリプロピ
レン繊維表面にポリエチレンをコーテイングした
不織布に界面活性剤処理したもの(B)、ポリプロピ
レン繊維を本実施例と同条件で10分間アクリル酸
溶液に浸漬してグラフト重合したもの(C)及び50分
間アクリル酸溶液に浸漬してグラフト重合したも
の(D)、を夫々セパレータとして上記と同様20AH
のニツケル−カドミウム電池10セルづつに組み込
み、同様の寿命試験を行つたところ、(A)は平均
298サイクル、(B)は平均301サイクル、(C)は平均
316サイクル、(D)は平均385サイクルであつた。こ
の結果からも本発明によるセパレータの優れてい
ることがわかる。 For comparison, a nonwoven fabric made of polypropylene fibers treated with a surfactant (A), a nonwoven fabric with polyethylene coated on the surface of polypropylene fibers treated with a surfactant (B), and a nonwoven fabric made of polypropylene fibers treated with a surfactant as in this example were prepared. The same 20AH as above was used as a separator using the graft polymerized by immersing in an acrylic acid solution for 10 minutes (C) and the graft polymerizing by immersing in an acrylic acid solution for 50 minutes under the same conditions (D).
When a similar life test was conducted using 10 nickel-cadmium batteries each, (A) showed that the average
298 cycles, (B) average 301 cycles, (C) average
316 cycles, and (D) had an average of 385 cycles. This result also shows that the separator according to the present invention is superior.
以上の如く、本発明は親水性に優れ且つ作業性
の良好なセパレータを提供するもので、工業的価
値大である。 As described above, the present invention provides a separator with excellent hydrophilicity and good workability, and is of great industrial value.
Claims (1)
囲にポリエチレン樹脂が鞘状に被覆された繊維か
らなる不織布に酸又は塩基と反応して直接或は間
接に塩を形成し得るビニルモノマーをグラフト共
重合させたことを特徴とする電池用セパレータ。1. Graft copolymerization of a vinyl monomer that can directly or indirectly form a salt by reacting with an acid or base onto a nonwoven fabric made of fibers with a polypropylene resin core and a polyethylene resin sheath-like coating around the core. A battery separator featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56025793A JPS57141862A (en) | 1981-02-23 | 1981-02-23 | Separator for battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56025793A JPS57141862A (en) | 1981-02-23 | 1981-02-23 | Separator for battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57141862A JPS57141862A (en) | 1982-09-02 |
| JPH0136231B2 true JPH0136231B2 (en) | 1989-07-28 |
Family
ID=12175707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56025793A Granted JPS57141862A (en) | 1981-02-23 | 1981-02-23 | Separator for battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57141862A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06101323B2 (en) * | 1987-11-17 | 1994-12-12 | 松下電器産業株式会社 | Battery separator |
| US5100723A (en) * | 1987-11-17 | 1992-03-31 | Matsushita Electric Industrial Co., Ltd. | Separator material for storage batteries |
| JPH07122164B2 (en) * | 1990-03-26 | 1995-12-25 | 金井重要工業株式会社 | Battery separator and manufacturing method thereof |
| EP0593612B2 (en) † | 1991-07-09 | 2005-06-29 | Scimat Limited | Polymeric sheet |
| JP2732760B2 (en) * | 1991-10-23 | 1998-03-30 | 金井重要工業株式会社 | Nonwoven fabric separator for battery and method for producing the same |
| US5589302A (en) * | 1994-11-04 | 1996-12-31 | Pall Corporation | Battery separator and battery containing same |
| US6291105B1 (en) | 1997-08-19 | 2001-09-18 | Daiwabo Co., Ltd. | Battery separator and method for manufacturing the same and battery |
-
1981
- 1981-02-23 JP JP56025793A patent/JPS57141862A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57141862A (en) | 1982-09-02 |
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