JPH11213979A - Separator for battery and battery - Google Patents
Separator for battery and batteryInfo
- Publication number
- JPH11213979A JPH11213979A JP10014628A JP1462898A JPH11213979A JP H11213979 A JPH11213979 A JP H11213979A JP 10014628 A JP10014628 A JP 10014628A JP 1462898 A JP1462898 A JP 1462898A JP H11213979 A JPH11213979 A JP H11213979A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- film
- separator
- adhesive agent
- tin oxide
- 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.)
- Pending
Links
Classifications
-
- 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
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電池用セパレータ
ーに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery separator.
【０００２】[0002]
【従来の技術】近年、ノート型パソコンを初めとし、二
次電池の需要が伸びてきている。それに伴い、電池のエ
ネルギ密度向上に対する要求も強まり、電池ケースの軽
量化や薄膜化が求められている。また、形状の多様化も
進んでおり、成形性の向上が期待される。従来の電池は
正負極間にそれを分離するためのセパレーターが挟み込
まれ、捲回され電解液が封入された状態である。しかし
ながら、セパレーターと各電極は固定されていないた
め、ある程度の隙間が存在し体積あたりのエネルギー密
度の向上の阻害要因となっている。また、捲回時に両極
とセパレーターを同時に巻き合わせるため、フィルムの
位置精度も厳しく要求されており、捲回速度をＵＰさせ
ることができず生産性向上も困難であった。2. Description of the Related Art In recent years, demand for secondary batteries, including notebook type personal computers, has been increasing. Along with this, there is a growing demand for an improvement in the energy density of the battery, and there is a demand for a lighter and thinner battery case. In addition, diversification of the shape is progressing, and improvement in moldability is expected. A conventional battery is in a state where a separator for separating the battery is sandwiched between a positive electrode and a negative electrode, wound and filled with an electrolyte. However, since the separator and each electrode are not fixed, some gaps are present, which hinders the improvement of the energy density per volume. Further, since both the electrode and the separator are wound simultaneously at the time of winding, the positional accuracy of the film is strictly required, and the winding speed cannot be increased, and it is difficult to improve the productivity.
【０００３】[0003]
【発明が解決しようとする課題】本発明は従来の粘着セ
パレーターに替わり、捲回速度を大幅に向上でき、より
薄くてコンパクトなセパレーターを提供することにあ
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a thinner and more compact separator which can greatly increase the winding speed and replace the conventional adhesive separator.
【０００４】[0004]
【課題を解決するための手段】本発明は、ポリエチレン
フィルム、ポリプロピレンフィルム、あるいはその複合
フィルムの両面に酸化錫を分散したアクリル系の粘着剤
を塗布してなる電池用セパレーターである。更に好まし
い形態としては、酸化錫の添加量が、バインダー１００
重量部に対して５００〜１５００重量部であり、粘着剤
層の厚みが５〜１５μｍであり、電極フィルムとの粘着
強度が１０g/２cm以上であり、粘着剤層が多孔質に形成
されており、ＪＩＳ P８１１７ による該フィルムの透
気度が１００ccあたり８００秒以下であり、アクリル系
粘着剤の分子量が１００万以上であり、硬化後のゲル分
率が９０％以上である電池用セパレーターである。ま
た、これらの電池用セパレーターを用いてなる薄型カー
ド電池である。SUMMARY OF THE INVENTION The present invention is a battery separator comprising a polyethylene film, a polypropylene film, or a composite film thereof, coated on both sides with an acrylic adhesive in which tin oxide is dispersed. In a more preferred embodiment, the amount of tin oxide added is
500 to 1500 parts by weight with respect to parts by weight, the thickness of the pressure-sensitive adhesive layer is 5 to 15 μm, the pressure-sensitive adhesive strength with the electrode film is 10 g / 2 cm or more, and the pressure-sensitive adhesive layer is formed porous. A battery separator according to JIS P8117, wherein the air permeability of the film is 800 seconds or less per 100 cc, the molecular weight of the acrylic pressure-sensitive adhesive is 1,000,000 or more, and the gel fraction after curing is 90% or more. Also, a thin card battery using these battery separators.
【０００５】[0005]
【発明の実施の形態】本発明に用いられる粘着剤の厚み
は５〜１５μｍが好ましく、電極フィルムとの粘着強度
が１０g/2cm以上であることが好ましい。厚みは、更に
好ましくは８〜１０μｍである。５μｍ未満では粘着強
度が１０g/2cmを割ってしまい貼り合わせた後、ずれが
発生してしまう。また、１５μｍを越えると厚みが厚く
なりすぎて通常の電池よりも電極とセパレーターの間隔
が広くなってしまう。また、酸化錫の添加量はバインダ
ー１００重量部に対して５００〜１５００重量部が好ま
しく、更に好ましくは７００〜１０００重量部である。
５００重量部未満では粘着剤層が多孔質にならず、ま
た、１５００重量部を越えると塗工時に粘度が高すぎて
均一な厚みに塗工することが難しい。DESCRIPTION OF THE PREFERRED EMBODIMENTS The thickness of the pressure-sensitive adhesive used in the present invention is preferably 5 to 15 μm, and the pressure-sensitive adhesive strength to an electrode film is preferably 10 g / 2 cm or more. The thickness is more preferably from 8 to 10 μm. If it is less than 5 μm, the adhesive strength will be less than 10 g / 2 cm, and a displacement will occur after bonding. On the other hand, if it exceeds 15 μm, the thickness becomes too large, and the distance between the electrode and the separator becomes wider than that of a normal battery. The amount of tin oxide added is preferably 500 to 1500 parts by weight, more preferably 700 to 1000 parts by weight, based on 100 parts by weight of the binder.
If the amount is less than 500 parts by weight, the pressure-sensitive adhesive layer does not become porous. If the amount exceeds 1500 parts by weight, the viscosity is too high at the time of coating, so that it is difficult to apply a uniform thickness.
【０００６】更に、多孔質化された粘着剤付セパレータ
ーの透気度がＪＩＳ Ｐ８１１７により１００ccあたり
８００秒以下が好ましく、更に好ましくは５００秒以下
である。８００秒を越えると電解液中のLiイオン等のイオン移
動抵抗が大きくなり実用に適さない。本発明に用いられ
るアクリル系粘着剤の分子量は１００万以上が好まし
く、硬化後のゲル分率が９０％以上であることが好まし
い。分子量が１００万未満では、電解液による粘着剤層
の劣化が発生してしまう。また、ゲル分率も９０％未満
では同様に耐電解液性が悪く、実用に適さない。Further, the air permeability of the porous separator with an adhesive is preferably 800 seconds or less, more preferably 500 seconds or less per 100 cc according to JIS P8117. If the time exceeds 800 seconds, the ion migration resistance of Li ions and the like in the electrolytic solution increases, which is not suitable for practical use. The molecular weight of the acrylic pressure-sensitive adhesive used in the present invention is preferably 1,000,000 or more, and the gel fraction after curing is preferably 90% or more. When the molecular weight is less than 1,000,000, the pressure-sensitive adhesive layer is deteriorated by the electrolytic solution. On the other hand, if the gel fraction is less than 90%, the electrolytic solution resistance is similarly poor, which is not suitable for practical use.
【０００７】[0007]
【実施例】以下に実施例を挙げて発明の効果を詳細に説
明するが、これは単なる例示であり本発明はこれに限定
されるものではない。ケースは図1に示した様にPP/PE/P
P三層からなる多孔質な多層フィルム上にアクリル系粘
着剤中に酸化錫を添加したワニスを両面に塗工し、熱処
理を４０℃で４８時間行った後電池用粘着剤付セパレー
ターを得た。また、得られたセパレーターの透気度をＪ
ＩＳ Ｐ８１１７により測定し、次にこのセパレーター
と電極フィルムと貼り合わせた後、電解液（DEC/EC=1/
1）中で６０℃、４８時間処理し、粘着力の測定を行
い、あわせて使用した粘着剤のゲル分率を測定した。実
施例及び比較例の電池ケース構成と測定結果を表１〜４
に示す。 注 ＰＰ ：ポリプロピレン ＰＥ ：ポリエチレン Ｓｎ０2：酸化錫 ＤＥＣ ：ジエチレンカーボネート ＥＣ ：エチレンカーボネートEXAMPLES The effects of the present invention will be described in detail below with reference to examples, but these are merely examples and the present invention is not limited thereto. Case is PP / PE / P as shown in Fig. 1.
A varnish in which tin oxide was added to an acrylic adhesive was applied on both sides of a porous multilayer film composed of three P layers, and heat treatment was performed at 40 ° C. for 48 hours to obtain a separator with a battery adhesive. . Further, the air permeability of the obtained separator is J
Measured according to IS P8117, and then bonded to the separator and the electrode film, and then the electrolyte (DEC / EC = 1 /
In 1), treatment was carried out at 60 ° C. for 48 hours, the adhesive strength was measured, and the gel fraction of the used adhesive was also measured. Tables 1 to 4 show the battery case configurations and measurement results of Examples and Comparative Examples.
Shown in Note PP: Polypropylene PE: Polyethylene Sn0 2: tin oxide DEC: diethylene carbonate EC: ethylene carbonate
【０００８】[0008]
【表１】 [Table 1]
【０００９】[0009]
【表２】 [Table 2]
【００１０】[0010]
【表３】 [Table 3]
【００１１】[0011]
【表４】 [Table 4]
【００１２】[0012]
【発明の効果】本発明は、セパレーターに耐電解液性を
有し、かつ、酸化錫を高充填した多孔質粘着剤層を両面
に形成させ、セパレーターと電極との密着性を付与する
ことにより、セル体積を削減し、かつ、電極とセパレー
ターの捲回時の位置合わせ工程をなくすことにより、体
積あたりのエネルギー密度を向上させ、セル組立時の捲
回工程の生産性を大幅に向上させた電池を提供すること
ができる。このような電池は、近年のエネルギ密度向上
や生産性向上の要求に答えることができる。According to the present invention, the separator is provided with a porous pressure-sensitive adhesive layer having high resistance to electrolyte and having a high filling of tin oxide on both surfaces thereof, thereby providing adhesion between the separator and the electrode. By reducing the cell volume and eliminating the positioning step when winding the electrode and separator, the energy density per volume was improved, and the productivity of the winding step during cell assembly was greatly improved. A battery can be provided. Such a battery can respond to recent demands for improvement in energy density and productivity.
【図1】本発明で使用されている粘着剤付セパレーター
の層構成を示す断面図である。FIG. 1 is a cross-sectional view illustrating a layer configuration of a separator with an adhesive used in the present invention.
1：粘着剤層 2：PP/PE/PP多孔質フィルム 3：粘着剤層 1: adhesive layer 2: PP / PE / PP porous film 3: adhesive layer
Claims (6)
フィルム、あるいはその複合フィルムの両面に酸化錫を
分散したアクリル系の粘着剤を塗布してなることを特徴
とする電池用セパレーター。1. A separator for a battery, comprising a polyethylene film, a polypropylene film, or a composite film thereof, coated on both sides with an acrylic adhesive in which tin oxide is dispersed.
量部に対して５００〜１５００重量部である請求項１記
載の電池用セパレーター。2. The battery separator according to claim 1, wherein the amount of tin oxide is 500 to 1500 parts by weight based on 100 parts by weight of the binder.
電極フィルムとの粘着強度が１０g/２cm以上である請求
項１、又は２記載の電池用セパレーター。3. The pressure-sensitive adhesive layer has a thickness of 5 to 15 μm,
3. The battery separator according to claim 1, wherein the adhesive strength to the electrode film is 10 g / 2 cm or more.
ＩＳ P８１１７ による該フィルムの透気度が１００cc
あたり８００秒以下である請求項１、２又は３記載の電
池用セパレーター。4. The pressure-sensitive adhesive layer is formed to be porous.
The air permeability of the film according to IS P8117 is 100cc
The battery separator according to claim 1, wherein the battery separator is 800 seconds or less.
上であり、硬化後のゲル分率が９０％以上である請求項
１、２、３又は４記載の電池用セパレーター。5. The battery separator according to claim 1, wherein the molecular weight of the acrylic pressure-sensitive adhesive is 1,000,000 or more, and the gel fraction after curing is 90% or more.
用セパレーターを用いてなる薄型カード電池。6. A thin card battery using the battery separator according to claim 1, 2, 3, 4, or 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10014628A JPH11213979A (en) | 1998-01-27 | 1998-01-27 | Separator for battery and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10014628A JPH11213979A (en) | 1998-01-27 | 1998-01-27 | Separator for battery and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11213979A true JPH11213979A (en) | 1999-08-06 |
Family
ID=11866471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10014628A Pending JPH11213979A (en) | 1998-01-27 | 1998-01-27 | Separator for battery and battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11213979A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100749645B1 (en) | 2006-03-21 | 2007-08-14 | 삼성에스디아이 주식회사 | Separator and lithium rechargeable battery using the same |
| EP2132807A1 (en) | 2007-03-07 | 2009-12-16 | LG Chem, Ltd. | Organic/inorganic composite separator and electrochemical device containing the same |
| JP2014123573A (en) * | 2014-02-07 | 2014-07-03 | Sony Corp | Separator and battery |
| CN104201312A (en) * | 2014-08-19 | 2014-12-10 | 中国科学院化学研究所 | Polyethylene membrane applied to high-power lithium ion battery and preparation method of polyethylene membrane applied to high-power lithium ion battery |
| JP2015092488A (en) * | 2009-08-06 | 2015-05-14 | 旭化成イーマテリアルズ株式会社 | Microporous membrane pile-up, manufacturing method of the same, and manufacturing method of microporous membrane |
| KR101535198B1 (en) * | 2012-06-04 | 2015-07-08 | 주식회사 엘지화학 | Separator for electrochemical devices with improved adhesion and method of manufacturing the same |
| CN111902965A (en) * | 2018-06-27 | 2020-11-06 | 东丽株式会社 | Porous film, secondary battery separator, and secondary battery |
-
1998
- 1998-01-27 JP JP10014628A patent/JPH11213979A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100749645B1 (en) | 2006-03-21 | 2007-08-14 | 삼성에스디아이 주식회사 | Separator and lithium rechargeable battery using the same |
| US8940428B2 (en) | 2006-03-21 | 2015-01-27 | Samsung Sdi Co., Ltd. | Separator, a lithium rechargeable battery using the same and a method of manufacture thereof |
| EP2132807A1 (en) | 2007-03-07 | 2009-12-16 | LG Chem, Ltd. | Organic/inorganic composite separator and electrochemical device containing the same |
| JP2010520095A (en) | 2007-03-07 | 2010-06-10 | エルジー・ケム・リミテッド | Organic / inorganic composite separation membrane and electrochemical device provided with the same |
| JP4694641B2 (en) * | 2007-03-07 | 2011-06-08 | エルジー・ケム・リミテッド | Organic / inorganic composite separation membrane and electrochemical device provided with the same |
| EP2132807B1 (en) * | 2007-03-07 | 2013-12-18 | LG Chem, Ltd. | Organic/inorganic composite separator and electrochemical device containing the same |
| EP3832788A1 (en) * | 2007-03-07 | 2021-06-09 | Lg Chem, Ltd. | Organic/inorganic composite separator and electrochemical device containing the same |
| EP2693530A3 (en) * | 2007-03-07 | 2016-11-30 | LG Chem, Ltd. | Organic/Inorganic Composite Separator and electrochemical Device containing the same |
| JP2015092488A (en) * | 2009-08-06 | 2015-05-14 | 旭化成イーマテリアルズ株式会社 | Microporous membrane pile-up, manufacturing method of the same, and manufacturing method of microporous membrane |
| KR101535198B1 (en) * | 2012-06-04 | 2015-07-08 | 주식회사 엘지화학 | Separator for electrochemical devices with improved adhesion and method of manufacturing the same |
| JP2014123573A (en) * | 2014-02-07 | 2014-07-03 | Sony Corp | Separator and battery |
| CN104201312A (en) * | 2014-08-19 | 2014-12-10 | 中国科学院化学研究所 | Polyethylene membrane applied to high-power lithium ion battery and preparation method of polyethylene membrane applied to high-power lithium ion battery |
| CN111902965A (en) * | 2018-06-27 | 2020-11-06 | 东丽株式会社 | Porous film, secondary battery separator, and secondary battery |
| CN111902965B (en) * | 2018-06-27 | 2024-02-09 | 东丽株式会社 | Porous film, separator for secondary battery, and secondary battery |
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