JPH1140171A - Air-zinc cell - Google Patents
Air-zinc cellInfo
- Publication number
- JPH1140171A JPH1140171A JP9198070A JP19807097A JPH1140171A JP H1140171 A JPH1140171 A JP H1140171A JP 9198070 A JP9198070 A JP 9198070A JP 19807097 A JP19807097 A JP 19807097A JP H1140171 A JPH1140171 A JP H1140171A
- Authority
- JP
- Japan
- Prior art keywords
- air
- positive electrode
- zinc
- catalyst layer
- layer
- 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.)
- Granted
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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Inert Electrodes (AREA)
- Hybrid Cells (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、大気中の酸素を正
極作用物質として用いる空気亜鉛電池に関し、さらに詳
しくは該空気亜鉛電池においてその一構成要素として用
いられる撥水層を改良した空気亜鉛電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zinc-air battery using oxygen in the atmosphere as a positive electrode active material, and more particularly, to a zinc-air battery having an improved water-repellent layer used as one component of the zinc-air battery. About.
【0002】[0002]
【従来の技術】空気亜鉛電池は正極作用物質として大気
中の酸素を、負極作用物質として亜鉛を、電解液として
アルカリ水溶液を用いており、主に補聴器やペイジャー
用にボタンタイプのものが製品化されている。2. Description of the Related Art A zinc-air battery uses oxygen in the air as a positive electrode active substance, zinc as a negative electrode active substance, and an alkaline aqueous solution as an electrolytic solution. A button type cell phone is mainly used for hearing aids and pagers. Have been.
【0003】これらの空気亜鉛電池の一例を示すと、例
えば図1のような構成からなっている。図中、1は正極
集電容器で、空気孔2を有している。3は拡散層で空気
孔2から取り込んだ空気をこの層内で拡散させ触媒層に
均一に供給することを目的としている。4は撥水層、5
は正極触媒層、6はセパレータであり、これらが正極組
立体を構成している。8は負極作用物質層、9は負極集
電容器、10は絶縁ガスケット、11はシールテープで
ある。One example of these zinc-air batteries is shown in FIG. In the drawing, reference numeral 1 denotes a positive electrode current collector having an air hole 2. Numeral 3 is a diffusion layer for the purpose of diffusing air taken in from the air holes 2 in this layer and uniformly supplying the air to the catalyst layer. 4 is a water-repellent layer, 5
Denotes a positive electrode catalyst layer, and 6 denotes a separator, and these constitute a positive electrode assembly. Reference numeral 8 denotes a negative electrode active material layer, 9 denotes a negative electrode current collecting container, 10 denotes an insulating gasket, and 11 denotes a seal tape.
【0004】上記したように、空気亜鉛電池は正極組立
体において撥水層を有しており、その材料としては1枚
以上のPTFE膜(ポリテトラフルオロエチレン)が用
いられることが一般的である。通常、このPTFE膜の
少なくとも1枚が正極触媒層と一体化されて使用されて
いる。As described above, a zinc-air battery has a water-repellent layer in a positive electrode assembly, and generally uses one or more PTFE membranes (polytetrafluoroethylene) as a material thereof. . Usually, at least one of the PTFE membranes is used integrally with the positive electrode catalyst layer.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、電池内
に配置するためにこのPTFE膜を一体化した触媒層を
所定の大きさに打ち抜き加工すると、その切り口の端部
において、PTFE膜と正極触媒層が剥がれてしまうと
の問題を抱えていた。However, when the catalyst layer in which the PTFE membrane is integrated is punched into a predetermined size in order to be arranged in the battery, the PTFE membrane and the cathode catalyst layer are cut at the end of the cut end. Had the problem of peeling off.
【0006】上記の両材料が剥がれたまま、これを電池
内に組み込んだ場合、電解液が両材料の間に溜まり、酸
素が正極触媒層に十分に供給されず、これが原因となっ
て、通常の放電特性を確保できなくなる問題があった。
本発明は上記問題点に対処してなされたもので、空気亜
鉛電池において撥水層を改良することによって放電特性
を向上させることを目的とするものである。[0006] When the two materials are peeled off and incorporated into a battery, the electrolyte is accumulated between the two materials and oxygen is not sufficiently supplied to the positive electrode catalyst layer. There is a problem that the discharge characteristics cannot be secured.
The present invention has been made in view of the above problems, and has as its object to improve the discharge characteristics of a zinc-air battery by improving the water-repellent layer.
【0007】[0007]
【課題を解決するための手段】すなわち本発明は、正極
作用物質に大気中の酸素、負極作用物質に亜鉛、電解液
にアルカリ水溶液を用い、正極が負極対向面から順に正
極触媒層と撥水層の少なくとも2層を有する空気亜鉛電
池において、撥水層が1枚またはそれ以上のPTFE膜
からなり、少なくともそのうちの1枚が正極触媒層と貼
り合わされて一体化した構造を有し、この一体化される
PTFE膜の厚さが170μm〜600μmであること
を特徴とする。In other words, the present invention uses oxygen in the air as a positive electrode active substance, zinc as a negative electrode active substance, an alkaline aqueous solution as an electrolytic solution, and a positive electrode in which a positive electrode catalyst layer and a water repellent are sequentially arranged from a negative electrode facing surface. In a zinc-air battery having at least two layers, the water-repellent layer is composed of one or more PTFE membranes, and at least one of the layers is bonded to and integrated with the positive electrode catalyst layer. The thickness of the PTFE film to be formed is 170 μm to 600 μm.
【0008】正極触媒層と一体化したPTFE膜につい
て種々検討した結果、上記範囲の厚さのものを用いるこ
とによって、剥がれの発生が全くなくなり、その結果、
放電特性を向上させることができることが分かった。す
なわち、PTFE膜が上記範囲以下ではPTFE膜が正
極触媒層から剥がれやすくなり、上記範囲以上では正極
触媒層と一体化するのが困難である。As a result of various studies on the PTFE membrane integrated with the positive electrode catalyst layer, the use of the PTFE membrane having a thickness within the above range completely eliminates peeling, and as a result,
It was found that the discharge characteristics could be improved. That is, when the PTFE film is below the above range, the PTFE film is easily peeled off from the positive electrode catalyst layer, and when it is above the above range, it is difficult to integrate with the positive electrode catalyst layer.
【0009】[0009]
【発明の実施の形態】本発明の実施形態を以下に説明す
る。 (実施例)代表的な空気亜鉛電池としてPR44(直径
11mm、総高5.4mm)を用いて本発明の実施例電
池を製作した。図1にその断面図を示す。Embodiments of the present invention will be described below. (Example) An example battery of the present invention was manufactured using PR44 (diameter 11 mm, total height 5.4 mm) as a typical zinc-air battery. FIG. 1 shows a cross-sectional view thereof.
【0010】図1において、1は正極集電容器で、空気
孔2を有している。3は拡散層で空気孔2から取り込ん
だ空気をこの層内で拡散させ触媒層に均一に供給するこ
とを目的としている。4は撥水層、5は正極触媒層、6
はセパレータであり、これらが正極組立体を構成してい
る。8は負極作用物質層、9は負極集電容器、10は絶
縁ガスケット、11はシールテープである。In FIG. 1, reference numeral 1 denotes a positive electrode current collector having an air hole 2. Numeral 3 is a diffusion layer for the purpose of diffusing air taken in from the air holes 2 in this layer and uniformly supplying the air to the catalyst layer. 4 is a water repellent layer, 5 is a positive electrode catalyst layer, 6
Are separators, and these constitute a positive electrode assembly. Reference numeral 8 denotes a negative electrode active material layer, 9 denotes a negative electrode current collecting container, 10 denotes an insulating gasket, and 11 denotes a seal tape.
【0011】撥水層4として、表1に示すように、17
0μm,200μm,300μm,450μm,600
μmの各種厚さのPTFE膜を用い、これを正極触媒層
に一体化した。一体化の方法としては、ゴムローラーを
用いて両材料を2ton程度の圧力で圧着することによ
って行った。As shown in Table 1, 17 water-repellent layers 4
0 μm, 200 μm, 300 μm, 450 μm, 600
PTFE films of various thicknesses of μm were used and integrated with the positive electrode catalyst layer. The integration was performed by pressing both materials under pressure of about 2 tons using a rubber roller.
【0012】(比較例)比較例として、表1に示すよう
に、170μm未満のPTFE膜と600μmを越える
PTFE膜を用いて撥水膜とし、他は実施例と同様にし
て空気亜鉛電池を製作した。なお、従来のPTFE膜の
厚さは100μmである。Comparative Example As a comparative example, as shown in Table 1, a water-repellent film was formed using a PTFE film having a size of less than 170 μm and a PTFE film having a size of more than 600 μm. did. Note that the thickness of the conventional PTFE film is 100 μm.
【0013】上記実施例および比較例の各空気亜鉛電池
について、撥水膜の剥がれ発生率と、電池の寿命を調べ
た。剥がれの発生率は、上記の材料を所定の形状に打ち
抜いたとき、その端部に剥がれの発生しているものをカ
ウントして発生率とした。また、電池の寿命は、各撥水
膜を用いて構成した電池について、620Ω放電を行
い、その放電特性が理論容量の80%に満たないものを
短寿命としてカウントした。放電環境は20℃60%R
Hとした。表1にその結果を示す。With respect to each of the zinc-air batteries of the above Examples and Comparative Examples, the rate of occurrence of peeling of the water-repellent film and the life of the batteries were examined. The occurrence rate of peeling was determined by counting the number of peeled edges at the end of the above material punched into a predetermined shape. In addition, regarding the life of the battery, a battery constituted using each water-repellent film was subjected to 620Ω discharge, and a battery whose discharge characteristic was less than 80% of the theoretical capacity was counted as a short life. Discharge environment is 20 ℃ 60% R
H. Table 1 shows the results.
【0014】[0014]
【表1】 [Table 1]
【0015】表1の結果から、170μm以上、600
μm以下のPTFE膜を用いた空気亜鉛電池は、剥がれ
の発生がなく、短寿命の発生もないことがわかる。これ
に対して比較例では、PTFE膜の厚さが本発明の範囲
未満の場合には剥がれが発生しており、単寿命の発生率
が高いことが分かる。また本発明の範囲を越える場合に
は正極触媒層に一体化できなかった。From the results shown in Table 1, it is found that 170 μm or more and 600
It can be seen that the zinc-air battery using the PTFE film having a thickness of not more than μm has no peeling and no short life. On the other hand, in the comparative example, when the thickness of the PTFE film was less than the range of the present invention, peeling occurred, and it can be seen that the rate of occurrence of single life was high. In addition, when it exceeds the range of the present invention, it cannot be integrated into the positive electrode catalyst layer.
【0016】なお、比較例2に示すように、通常使用さ
れるPTFE膜においても短寿命が発生しているが、実
際の生産においては全数検査を実施しているため、市販
品からはこのような短寿命は起きない。[0016] As shown in Comparative Example 2, although the PTFE membrane that is normally used also has a short life, in actual production, 100% inspection is performed. No short life will occur.
【0017】[0017]
【発明の効果】以上説明したように、本発明の空気亜鉛
電池は、短寿命の発生がなく、十分な放電特性を得るこ
とができる。As described above, the zinc-air battery of the present invention does not have a short life and can obtain sufficient discharge characteristics.
【図1】本発明の一実施例である空気電池の要部断面
図。FIG. 1 is a sectional view of a main part of an air battery according to an embodiment of the present invention.
1…正極集電容器(アウターカン)、2…空気孔、3…
拡散層、4…撥水層、5…正極触媒層、6…セパレー
タ、7…正極組立体、8…負極作用物質層、9…負極集
電容器、10…絶縁ガスケット、11…シールテープ。1: positive electrode current collector container (outer can), 2: air hole, 3:
Diffusion layer, 4 ... water repellent layer, 5 ... positive electrode catalyst layer, 6 ... separator, 7 ... positive electrode assembly, 8 ... negative electrode active material layer, 9 ... negative electrode current collector container, 10 ... insulating gasket, 11 ... seal tape.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川口 正夫 東京都品川区南品川三丁目4番10号 東芝 電池株式会社内 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masao Kawaguchi 3-4-10 Minamishinagawa, Shinagawa-ku, Tokyo Toshiba Battery Corporation
Claims (1)
物質に亜鉛、電解液にアルカリ水溶液を用い、正極が負
極対向面から順に正極触媒層と撥水層の少なくとも2層
を有する空気亜鉛電池において、撥水層が1枚またはそ
れ以上のPTFE膜からなり、少なくともそのうちの1
枚が正極触媒層と貼り合わされて一体化した構造を有
し、この一体化されるPTFE膜の厚さが170μm〜
600μmであることを特徴とする空気亜鉛電池。1. An air zinc having at least two layers of a positive electrode catalyst layer and a water-repellent layer in order from a negative electrode facing surface, using oxygen in the air as a positive electrode active substance, zinc as an negative electrode active substance, and an alkaline aqueous solution as an electrolytic solution. In the battery, the water-repellent layer is composed of one or more PTFE films, and
Has a structure in which the sheets are bonded to and integrated with the positive electrode catalyst layer, and the thickness of the integrated PTFE film is 170 μm or more.
A zinc-air battery having a thickness of 600 μm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19807097A JP3471575B2 (en) | 1997-07-24 | 1997-07-24 | Air zinc battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19807097A JP3471575B2 (en) | 1997-07-24 | 1997-07-24 | Air zinc battery |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1140171A true JPH1140171A (en) | 1999-02-12 |
JP3471575B2 JP3471575B2 (en) | 2003-12-02 |
Family
ID=16385031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19807097A Expired - Fee Related JP3471575B2 (en) | 1997-07-24 | 1997-07-24 | Air zinc battery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3471575B2 (en) |
-
1997
- 1997-07-24 JP JP19807097A patent/JP3471575B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP3471575B2 (en) | 2003-12-02 |
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