JPH0888001A - Hydrogen storage alloy electrode and manufacture thereof - Google Patents

Hydrogen storage alloy electrode and manufacture thereof

Info

Publication number
JPH0888001A
JPH0888001A JP6247272A JP24727294A JPH0888001A JP H0888001 A JPH0888001 A JP H0888001A JP 6247272 A JP6247272 A JP 6247272A JP 24727294 A JP24727294 A JP 24727294A JP H0888001 A JPH0888001 A JP H0888001A
Authority
JP
Japan
Prior art keywords
hydrogen storage
binder
storage alloy
electrode
weight
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
Application number
JP6247272A
Other languages
Japanese (ja)
Other versions
JP3150546B2 (en
Inventor
Ikuo Fukui
育生 福井
Yukihiro Kuribayashi
幸弘 栗林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shin Etsu Chemical Co Ltd
Original Assignee
Shin Etsu Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Chemical Co Ltd
Priority to JP24727294A priority Critical patent/JP3150546B2/en
Publication of JPH0888001A publication Critical patent/JPH0888001A/en
Application granted granted Critical
Publication of JP3150546B2 publication Critical patent/JP3150546B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Landscapes

  • Battery Electrode And Active Subsutance (AREA)

Abstract

PURPOSE: To provide a battery, light with no capacity deterioration, and high performance by using hydroxyalkylcellulose as the main component of a binder and limiting the amount of the total binder to 0.1-2.0wt.% based on the weight of a hydrogen storage alloy. CONSTITUTION: Hydrogen storage alloy powder is supported on the surface of a conductive supporting body with a binder to form a electrode, and hydroxyalkylcellulose is used as the main component of the binder. The amount of the total binder is limited to 0.1-2.0wt.% based on the weight of the hydrogen storage alloy. If the amount of the total binder is less than 0.1wt.%, binding capability becomes insufficient and decreases the capacity of a battery and the electrode. If the amount of the total binder is more than 2.0wt.%, conductivity of the electrode is decreased, and since the binder covers the surface of the hydrogen storage alloy, hydrogen storage capacity is decreased. Hydrogen storage alloy powder is dispersed in a binder aqueous solution in which the binder is dissolved so that the content of the binder becomes 0.1-2.0wt.% to form slurry, and the slurry is applied to the conductive supporting body, and dried. By the action of the binder, shape change is suppressed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は水素吸蔵合金を用いた電
極に関し、特に、アルカリ蓄電池用負電極として好適な
水素吸蔵合金電極及びその製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode using a hydrogen storage alloy, and more particularly to a hydrogen storage alloy electrode suitable as a negative electrode for alkaline storage batteries and a method for producing the same.

【0002】[0002]

【従来の技術】周知の如く、蓄電池としては、従来から
ニッケル−カドミウム電池及び鉛電池が使用されてい
る。しかしながら、近年、蓄電池の用途が増大し、ま
た、環境保全の観点から電気自動車の実用化が望まれる
なかで、より軽量で高容量なエネルギー密度の高い蓄電
池の開発が切望されている。かかる背景において、水素
吸蔵合金の水素の吸蔵及び放出能を利用した水素吸蔵合
金電極を負極とし、水酸化ニッケルを正極とする金属水
素アルカリ蓄電池が注目を集めている。
2. Description of the Related Art As is well known, nickel-cadmium batteries and lead batteries have been used as storage batteries. However, in recent years, the use of storage batteries has increased, and with the demand for practical use of electric vehicles from the viewpoint of environmental protection, there is a strong demand for the development of storage batteries with lighter weight, higher capacity, and higher energy density. Against this background, a metal-hydrogen alkaline storage battery, in which a hydrogen storage alloy electrode utilizing the hydrogen storage and release ability of a hydrogen storage alloy as a negative electrode and nickel hydroxide as a positive electrode, has been attracting attention.

【0003】しかしながら、上記の金属−水素アルカリ
蓄電池においては、充放電を繰り返すことにより、負極
の水素吸蔵合金が微粉化して電極から脱落するために、
容量低下が長期的に継続し、ついには使用に耐えなくな
るという欠点があった。上記の長期に渡る容量低下の現
象の程度は、水素吸蔵合金を担持する導電性支持体(集
電体)の種類に依存し、繊維ニッケルや発泡ニッケルの
ような三次元集電体を使用する場合に比較し、パンチン
グメタルのような二次元集電体を用いた場合の方が顕著
である。
However, in the above-mentioned metal-hydrogen alkaline storage battery, due to repeated charging and discharging, the hydrogen storage alloy of the negative electrode is pulverized and drops off from the electrode.
There is a drawback that the capacity continues to decrease for a long period of time, and eventually it becomes unusable. The extent of the above-mentioned phenomenon of capacity decrease over a long period depends on the type of the conductive support (current collector) carrying the hydrogen storage alloy, and a three-dimensional current collector such as nickel fiber or nickel foam is used. Compared with the case, the case where a two-dimensional current collector such as punching metal is used is more remarkable.

【0004】しかしながら、二次元集電体は、三次元集
電体よりも安価である上、電極の製造効率が良いという
利点がある。そこで、ポリテトラフルオロエチレンやポ
リエチレンオキサイド等の複数の結着剤を用いて水素吸
蔵合金ペーストを調製し、これをパンチングメタル等の
二次元集電体に塗工し、加熱圧着して水素吸蔵合金を前
記集電体に強固に担持させてなる電極が提案された(特
開昭61−66366号公報)。
However, the two-dimensional current collector is advantageous in that it is less expensive than the three-dimensional current collector and that the electrode manufacturing efficiency is good. Therefore, a hydrogen storage alloy paste is prepared using a plurality of binders such as polytetrafluoroethylene or polyethylene oxide, and the paste is applied to a two-dimensional current collector such as punching metal or the like and heated and pressed to bond the hydrogen storage alloy. An electrode has been proposed in which the above is firmly supported on the current collector (Japanese Patent Laid-Open No. 61-66366).

【0005】しかしながら、この場合に使用される結着
剤の量は、上記公報の実質例に記載されているように水
素吸蔵合金に対して6重量%と多量であるために、水素
吸蔵合金の表面が結着剤により絶縁被覆されるらしく、
電池及び電極の容量を十分に大きくすることができない
という欠点がある。また、上記の如く結着剤としてポリ
テトラフルオロエチレンを用いる場合には、特開平2−
112158号公報に例示される如く、通常、予め、水
素吸蔵合金と結着剤からなるシート状のペースト混練り
物を調製し、これをパンチングメタルの両面から圧着し
て電極が作製される。
However, since the amount of the binder used in this case is as large as 6% by weight with respect to the hydrogen storage alloy as described in the substantial examples of the above publications, the amount of the binder of the hydrogen storage alloy is large. It seems that the surface is insulated with a binder,
There is a drawback that the capacity of the battery and the electrode cannot be increased sufficiently. Further, when polytetrafluoroethylene is used as the binder as described above, the method disclosed in JP-A-2-
As exemplified in Japanese Patent No. 112158, a sheet-shaped paste kneaded product composed of a hydrogen storage alloy and a binder is usually prepared in advance, and this is pressure-bonded from both sides of a punching metal to produce an electrode.

【0006】従って、インク状のペーストを調製し、こ
れを、浸漬等の方法によってパンチングメタル等に塗布
して電極を作製するというような、簡便な電極の製造方
法は知られていない。本発明者等は、上記の欠点を解決
すべく鋭意検討した結果、結着剤としてヒドロキシアル
キルアルキルセルロース及び/又はアルキルセルロース
を用いた場合には、それらを極く少量使用するだけで、
水素吸蔵合金をインク状のペーストとすることができる
こと、及び、このペーストをパンチングメタルに塗布・
乾燥するだけで高性能の水素吸蔵合金電極を得ることが
できることを見い出し、本発明に到達した。
Therefore, a simple method for producing an electrode, such as preparing an ink-like paste and applying it to a punching metal or the like by a method such as dipping to produce an electrode, is not known. The present inventors, as a result of intensive studies to solve the above-mentioned drawbacks, when using hydroxyalkylalkylcellulose and / or alkylcellulose as a binder, use them in an extremely small amount,
The hydrogen storage alloy can be made into an ink paste, and this paste can be applied to punching metal.
They have found that a high-performance hydrogen storage alloy electrode can be obtained only by drying, and have reached the present invention.

【0007】[0007]

【発明が解決しようとする課題】従って、本発明の第1
の目的は、軽量で容量低下現象のない、高性能のアルカ
リ蓄電池用水素吸蔵合金電極を提供することにある。本
発明の第2の目的は、軽量で高性能なアルカリ蓄電池用
水素吸蔵合金電極の、簡易な製造方法を提供することに
ある。更に本発明の第3の目的は、極少量の結着剤でパ
ンチングメタルに水素吸蔵合金を強固に担持せしめる方
法を提供することにある。
Therefore, the first aspect of the present invention
It is an object of the present invention to provide a high-performance hydrogen storage alloy electrode for alkaline storage batteries, which is lightweight and does not have a capacity reduction phenomenon. A second object of the present invention is to provide a simple and high-performance method for manufacturing a lightweight and high-performance hydrogen storage alloy electrode for an alkaline storage battery. Further, a third object of the present invention is to provide a method for firmly supporting a hydrogen storage alloy on a punching metal with a very small amount of binder.

【0008】[0008]

【課題を解決するための手段】本発明の上記の諸目的
は、導電性支持体表面に、水素吸蔵合金粉末が結着剤に
よって担持されてなる電極であって、前記結着剤の主成
分がヒドロキシアルキルアルキルセルロース及び/又は
アルキルセルロースであると共に、全結着剤の量が、水
素吸蔵合金の0.1〜2.0重量%であることを特徴と
する、水素吸蔵合金電極及びその製造方法によって達成
された。
The above-mentioned various objects of the present invention are an electrode in which a hydrogen storage alloy powder is carried by a binder on the surface of a conductive support, and the main component of the binder is Is a hydroxyalkylalkylcellulose and / or an alkylcellulose, and the total amount of the binder is 0.1 to 2.0% by weight of the hydrogen storage alloy, and a hydrogen storage alloy electrode and its production. Achieved by the method.

【0009】本発明で使用する水素吸蔵合金は公知のも
のの中から適宜選択して使用することができるが、特
に、量産性や、価格的な面から、ミッシュメタル(M
m)を主原料とするものが好ましく、特に、ランタンリ
ッチミッシュメタルを主原料とするものが好ましい。ミ
ッシュメタルは希土類元素の混合物であり、例えば、C
e45重量%、La30重量%、Nd5重量%及びその
他の希土類元素20重量%からなるが、特にLaが40
重量%以上のものがランタンリッチミッシュメタルと称
される。
The hydrogen storage alloy used in the present invention can be appropriately selected from known ones and used. In particular, from the viewpoint of mass productivity and cost, the misch metal (M
It is preferable to use m) as the main raw material, and particularly preferable to use lanthanum-rich misch metal as the main raw material. Misch metal is a mixture of rare earth elements, such as C
e 45% by weight, La 30% by weight, Nd 5% by weight and other rare earth elements 20% by weight.
A lanthanum rich misch metal is called a lanthanum rich misch metal.

【0010】本発明で結着剤として使用するヒドロキシ
アルキルアルキルセルロース及びアルキルセルロース
は、1重量%水溶液としたときの20℃における粘度が
200cp以上であることが必要であり、特に500c
p以上であることが好ましい。粘度が200cp未満で
あると、水素吸蔵合金を分散したスラリーの塗布適性が
悪くなる上、スラリーからー水素吸蔵合金が沈降し易く
なるので、それを防止するために結着剤の使用量を増加
させなければならなくなるので好ましくない。また、電
池の電気化学的反応を阻害しないために、結着剤の純度
は高い程好ましい。
The hydroxyalkylalkyl cellulose and alkyl cellulose used as the binder in the present invention need to have a viscosity of 200 cp or more at 20 ° C. in a 1 wt% aqueous solution, and especially 500 c.
It is preferably p or more. If the viscosity is less than 200 cp, the coating suitability of the slurry in which the hydrogen storage alloy is dispersed is deteriorated, and the hydrogen storage alloy easily precipitates from the slurry. Therefore, the amount of the binder used is increased to prevent it. It is not desirable because it will have to be done. In addition, the purity of the binder is preferably as high as possible in order not to hinder the electrochemical reaction of the battery.

【0011】ヒドロキシアルキルアルキルセルロースと
しては、ヒドロキシプロピルメチルセルロース、ヒドロ
キシエチルメチルセルロース、及び、ヒドロキシエチル
エチルセルロースが好ましく、アルキルセルロースとし
てはメチルセルロースが好ましい。その理由は、これら
のセルロース誘導体が、分散媒として使用する水に対す
る溶解性に優れる上、加熱によりその水溶液がゲル化す
るという特性を有しているからである。
The hydroxyalkylalkylcellulose is preferably hydroxypropylmethylcellulose, hydroxyethylmethylcellulose or hydroxyethylethylcellulose, and the alkylcellulose is preferably methylcellulose. The reason is that these cellulose derivatives have excellent solubility in water used as a dispersion medium and also have the property that the aqueous solution thereof is gelated by heating.

【0012】即ち、本発明においては、これらのアルキ
ルアルキルセルロース及び/又はアルキルセルロース
を、水素吸蔵合金に対して0.1〜2.0重量%となる
ように溶解した水溶液中に水素吸蔵合金粉末を分散した
スラリーを、浸漬塗布等の方法によって導電性支持体上
に塗布・乾燥するが、結着剤が前記の特性を有するため
に、乾燥中における形状変化が抑制される。
That is, in the present invention, the hydrogen-absorbing alloy powder is prepared by dissolving these alkylalkylcelluloses and / or alkylcelluloses in an amount of 0.1 to 2.0% by weight based on the hydrogen-absorbing alloy. The slurry in which is dispersed is applied and dried on the conductive support by a method such as dip coating. Since the binder has the above-mentioned properties, the change in shape during drying is suppressed.

【0013】結着剤としてのヒドロキシアルキルアルキ
ルセルロース及び/又はアルキルセルロースの添加量が
水素吸蔵合金の0.1重量%より少ないと結着性が不十
分となり、電池及び電極の容量低下をもたらす。一方、
2.0重量%より多くなると電極の導電率が低下する
上、結着剤が水素吸蔵合金表面を被覆して水素吸蔵能力
を低下させるので、電池及び電極の容量を十分に大きく
することがでない。
When the amount of hydroxyalkylalkyl cellulose and / or alkyl cellulose added as a binder is less than 0.1% by weight of the hydrogen storage alloy, the binding property becomes insufficient and the capacity of the battery and the electrode is lowered. on the other hand,
When it is more than 2.0% by weight, the conductivity of the electrode is lowered, and the binder coats the surface of the hydrogen storage alloy to lower the hydrogen storage capacity, so that the capacity of the battery and the electrode cannot be sufficiently increased. .

【0014】本発明においては、結着剤の使用量を上記
の範囲とした場合に、塗布性及び結着性が良好となる限
り、他の結着剤を併用しても良い。これが、「結着剤の
主成分がヒドロキシアルキルアルキルセルロース及び/
又はアルキルセルロースである」の意味である。但し、
結着剤の総量は上述する理由から、水素吸蔵合金に対し
て、0.1〜2.0重量%の範囲とする必要がある。
In the present invention, when the amount of the binder used is in the above range, another binder may be used in combination as long as the coatability and the bondability are good. This is "the main component of the binder is hydroxyalkylalkyl cellulose and /
Or alkyl cellulose ”. However,
For the reason described above, the total amount of the binder needs to be in the range of 0.1 to 2.0% by weight based on the hydrogen storage alloy.

【0015】他の結着剤としてはカルボキシメチルセル
ロース、ポリエチレンオキサイド、ポリアクリル酸塩等
から選ばれる1種以上が併用できるが、この場合、結着
性能は、ヒドロキシアルキルアルキルセルロース及び/
又はアルキルセルロースのみで十分であるので、併用す
る結着剤としては、ポリテトラフルオロエチレンのよう
な撥水性のものを用いることが好ましい。このような撥
水性材料を併用することにより、過充電時に正極で発生
する酸素ガスが負極で消費されるときの消費効率を改善
することができる。
As the other binder, one or more selected from carboxymethyl cellulose, polyethylene oxide, polyacrylate and the like can be used in combination. In this case, the binding performance is hydroxyalkylalkyl cellulose and / or
Alternatively, since only alkyl cellulose is sufficient, it is preferable to use a water-repellent binder such as polytetrafluoroethylene as the binder to be used in combination. By using such a water-repellent material together, it is possible to improve the consumption efficiency when the oxygen gas generated in the positive electrode during overcharge is consumed in the negative electrode.

【0016】本発明の水素吸蔵合金電極の製造方法にお
いては、先ず、1〜5重量%の結着剤の水溶液を調製
し、水素吸蔵合金に対する結着剤の量が、前記した0.
3〜2.0重量%となるように水素吸蔵合金粉末を加
え、更に水を加えて所望の粘度のインク状ペーストを調
製する。この際、必要に応じて、カーボンブラック等の
導電材や、その他の種々の添加剤を加えても良い。次い
で、このペーストをパンチングメタル等の集電体に塗布
・乾燥し、更に加圧する。
In the method for producing a hydrogen storage alloy electrode of the present invention, first, an aqueous solution of a binder of 1 to 5 wt% is prepared, and the amount of the binder with respect to the hydrogen storage alloy is set to 0.
Hydrogen absorbing alloy powder is added so as to be 3 to 2.0% by weight, and water is further added to prepare an ink paste having a desired viscosity. At this time, if necessary, a conductive material such as carbon black and various other additives may be added. Next, this paste is applied to a current collector such as punching metal, dried, and further pressed.

【0017】支持体へのペーストの塗布は、ブレード塗
布、ローラー塗布、浸漬塗布等、公知の手段によって適
宜行うことができる。集電体の種類にかかわらず、塗布
したペーストを乾燥した後、1〜500t/cm2 で加
圧することが好ましい。最後にリード線を付着させるこ
とによって電極が得られる。このようにして得られた電
極は、特にアルカリ蓄電池用の負電極として好適であ
る。
The paste can be applied to the support by any known means such as blade coating, roller coating and dip coating. Regardless of the type of current collector, it is preferable to apply a pressure of 1 to 500 t / cm 2 after drying the applied paste. Finally, the leads are attached to obtain the electrodes. The electrode thus obtained is particularly suitable as a negative electrode for alkaline storage batteries.

【0018】[0018]

【発明の効果】本発明の水素吸蔵合金電極は、使用され
ている結着剤の量が水素吸蔵合金の使用量に対して十分
に少量であるので、軽量であるにもかかわらず高性能で
ある。本発明の水素吸蔵合金電極の製造方法は、インク
状のペーストを導電性支持体表面に塗布・乾燥すれば良
いので極めて簡便である。また結着剤として、極めて結
着性に優れたヒドロキシアルキルアルキルセルロース及
び/又はアルキルセルロースを用いるので、パンチング
メタルのような二次元支持体に対しても十分強固に水素
吸蔵合金を担持させることができる。
INDUSTRIAL APPLICABILITY The hydrogen storage alloy electrode of the present invention has a high performance even though it is lightweight because the amount of the binder used is sufficiently smaller than the amount of the hydrogen storage alloy used. is there. The method for producing a hydrogen storage alloy electrode of the present invention is extremely simple because it is sufficient to apply an ink-like paste on the surface of the conductive support and dry it. Further, since a hydroxyalkylalkylcellulose and / or alkylcellulose having an extremely excellent binding property is used as a binder, the hydrogen storage alloy can be supported sufficiently firmly even on a two-dimensional support such as punching metal. it can.

【0019】[0019]

【実施例】以下、本発明を実施例及び比較例によって更
に説明するが、本発明はこれによって限定されるもので
はない。尚、添加量を示す「部」は他に特別の記載がな
い限り「重量部」を表す。
EXAMPLES The present invention will be further described below with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In addition, "part" indicating the addition amount represents "part by weight" unless otherwise specified.

【0020】実施例1.LaリッチMm1.00に対
し、Ni,Co,Mn,Alが原子比で各々3.75,
0.75,0.20及び0.30の組成を有すると共に
平均粒径が20〜50μmの水素吸蔵合金粉末に、水素
吸蔵合金に対してヒドロキシプロピルメチルセルロース
が0.5重量%となるように、20℃での1.0%水溶
液粘度が4.620cpであるヒドロキシプロピルメチ
ルセルロース(信越化学工業株式会社製 商品名:90
SH−100,000)の2重量%水溶液と適当量の水
を加え、混練りして、35,000cpの粘度を有する
スラリーを得た。
Example 1. La-rich Mm 1.00, Ni, Co, Mn, Al in atomic ratio of 3.75,
In a hydrogen storage alloy powder having a composition of 0.75, 0.20 and 0.30 and an average particle diameter of 20 to 50 μm, hydroxypropylmethylcellulose is 0.5% by weight based on the hydrogen storage alloy, Hydroxypropylmethyl cellulose having a 1.0% aqueous solution viscosity at 20 ° C. of 4.620 cp (trade name: 90, manufactured by Shin-Etsu Chemical Co., Ltd.)
2% by weight aqueous solution of SH-100,000 and an appropriate amount of water were added and kneaded to obtain a slurry having a viscosity of 35,000 cp.

【0021】集電体としてニッケルメッキを施したパン
チングメタルを用い、得られたスラリーに集電体を浸漬
した後引き上げて、集電体表面に水素吸蔵合金を含むス
ラリーを塗工し、100℃で乾燥し、100t/cm2
で加圧して負極電極を得た。正極として焼結式ニッケル
極を使用し、これら正、負極の間に不織物からなるセパ
レータを捲回することにより渦巻電極体を得た。次い
で、この渦巻電極体を電池外装缶に挿入し、6Nの水酸
化カリウム水溶液を電解液として注液した後、封入し
て、公称容量1200mAの密閉製ニッケル−水素アル
カリ蓄電池を作製した。
A nickel-plated punching metal is used as a current collector, and the current collector is immersed in the obtained slurry and then pulled up to apply a slurry containing a hydrogen storage alloy to the surface of the current collector, and the temperature is 100 ° C. Dried at 100 t / cm 2
Then, the pressure was applied to obtain a negative electrode. Using a sintered nickel electrode as the positive electrode, a spirally wound electrode body was obtained by winding a non-woven separator between the positive and negative electrodes. Next, this spirally wound electrode body was inserted into a battery outer can, and after pouring 6N potassium hydroxide aqueous solution as an electrolytic solution, it was sealed and a sealed nickel-hydrogen alkaline storage battery having a nominal capacity of 1200 mA was produced.

【0022】実施例2.水素吸蔵合金に対するヒドロキ
シプロピルメチルセルロースの添加量を0.3重量%と
した他は、実施例1と同様にして電池を作製した。 実施例3.水素吸蔵合金に対するヒドロキシプロピルメ
チルセルロースの添加量を2.0重量%とした他は、実
施例1と同様にして電池を作製した。
Example 2. A battery was produced in the same manner as in Example 1 except that the amount of hydroxypropylmethyl cellulose added to the hydrogen storage alloy was 0.3% by weight. Example 3. A battery was produced in the same manner as in Example 1 except that the amount of hydroxypropylmethyl cellulose added to the hydrogen storage alloy was 2.0% by weight.

【0023】実施例4.結着剤として20℃での1.0
%水溶液粘度が15,800cpであるヒドロキシプロ
ピルメチルセルロース(信越化学工業株式会社 商品
名:SHV−P)の1.5重量%水溶液を用いた他は、
実施例1と同様にして電池を作製した。
Example 4. 1.0 at 20 ° C as a binder
% Aqueous solution except that a 1.5 wt% aqueous solution of hydroxypropylmethyl cellulose (Shin-Etsu Chemical Co., Ltd., trade name: SHV-P) having a viscosity of 15,800 cp was used.
A battery was produced in the same manner as in Example 1.

【0024】実施例5.水素吸蔵合金に対し、ヒドロキ
シプロピルメチルセルロースの添加量を0.1重量%と
し、更に水素吸蔵合金に対し1.0重量%となるように
ポリテトラフルオロエチレン分散液を併用した他は、実
施例1と同様にして電池を作製した。
Example 5. Example 1 except that the addition amount of hydroxypropylmethylcellulose was 0.1% by weight with respect to the hydrogen storage alloy, and the polytetrafluoroethylene dispersion liquid was used together so as to be 1.0% by weight with respect to the hydrogen storage alloy. A battery was prepared in the same manner as in.

【0025】実施例6.結着剤として20℃での1.0
%水溶液粘度が2,100cpであるメチルセルロース
(信越化学工業株式会社 試作品)の2重量%水溶液を
用いた他は、実施例1と同様にして電池を作製した。
Example 6. 1.0 at 20 ° C as a binder
% Aqueous solution A battery was produced in the same manner as in Example 1 except that a 2% by weight aqueous solution of methylcellulose (Shin-Etsu Chemical Co., Ltd. prototype) having a viscosity of 2,100 cp was used.

【0026】比較例1.水素吸蔵合金に対するヒドロキ
シプロピルメチルセルロースの添加量を0.05重量%
とした他は、実施例1と同様にして電池を作製した。 比較例2.水素吸蔵合金に対するヒドロキシプロピルメ
チルセルロースの添加量を3.0重量%とした他は、実
施例1と同様にして電池を作製した。
Comparative Example 1. Addition amount of hydroxypropylmethylcellulose to hydrogen storage alloy is 0.05% by weight
A battery was produced in the same manner as in Example 1 except that Comparative example 2. A battery was produced in the same manner as in Example 1 except that the amount of hydroxypropylmethyl cellulose added to the hydrogen storage alloy was 3.0% by weight.

【0027】比較例3.水素吸蔵合金に対し、ヒドロキ
シプロピルメチルセルロースの添加量を1.0重量%と
し、更に水素吸蔵合金に対し2.0重量%となるように
ポリテトラフルオロエチレン分散液を併用した他は、実
施例1と同様にして電池を作製した。
Comparative Example 3. Example 1 except that the addition amount of hydroxypropylmethylcellulose was 1.0% by weight with respect to the hydrogen storage alloy, and the polytetrafluoroethylene dispersion liquid was used together so as to be 2.0% by weight with respect to the hydrogen storage alloy. A battery was prepared in the same manner as in.

【0028】実施例及び比較例で作製した電池を、それ
ぞれ0.3C率の電流で5時間充電した後、0.2C率
の電流で放電し、電池電圧が1.0Vになった時点で放
電を中止し、再度充電するというサイクル条件で、充放
電サイクル試験を行った結果を図1に示す。図中の電池
容量は、実施例1で得られた電池の初期容量を100%
としたものである。
The batteries prepared in Examples and Comparative Examples were each charged with a current of 0.3C rate for 5 hours, then discharged with a current of 0.2C rate, and discharged when the battery voltage became 1.0V. FIG. 1 shows the result of a charge / discharge cycle test under the cycle condition of stopping the charging and recharging. The battery capacity in the figure is 100% of the initial capacity of the battery obtained in Example 1.
It is what

【0029】図1から、本発明の方法で得られた電池が
特に、サイクル特性に優れることが実証された。また、
本発明の方法によれば、ヒドロキシアルキルアルキルセ
ルロース及び/又はアルキルセルロース以外に種々の添
加剤を添加した場合でも、電極が絶縁物で被覆されて起
こる導電率の低下及び/又はこれに伴う容量低下を抑制
することができるので、高容量及びサイクル特性に優れ
る水素吸蔵電極が得られることが確認された。
From FIG. 1, it was proved that the battery obtained by the method of the present invention was particularly excellent in cycle characteristics. Also,
According to the method of the present invention, even when various additives other than hydroxyalkylalkyl cellulose and / or alkyl cellulose are added, the conductivity is reduced and / or the capacity is reduced due to the electrode being covered with an insulator. It was confirmed that a hydrogen storage electrode having a high capacity and excellent cycle characteristics can be obtained since

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例及び比較例で得られた電池について充放
電サイクル試験を行ったときの、電池容量のサイクル依
存性を示す図である。
FIG. 1 is a diagram showing the cycle dependence of battery capacity when a charge / discharge cycle test was performed on the batteries obtained in Examples and Comparative Examples.

【符号の説明】[Explanation of symbols]

●、▲、■、○、◇及び▽は、それぞれ、実施例1〜6
で鰓得た電池についてのグラフであり、△、□及び◆
は、それぞれ、比較例1〜3で得られた電池についての
グラフである。
●, ▲, ■, ○, ◇ and ▽ are the examples 1 to 6 respectively.
It is a graph of the battery obtained in the following, △, □ and ◆
3A and 3B are graphs of the batteries obtained in Comparative Examples 1 to 3, respectively.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 導電性支持体表面に、水素吸蔵合金粉末
が結着剤によって担持されてなる電極であって、前記結
着剤の主成分がヒドロキシアルキルアルキルセルロース
及び/又はアルキルセルロースであると共に、全結着剤
の量が、水素吸蔵合金の0.1〜2.0重量%であるこ
とを特徴とする、水素吸蔵合金電極。
1. An electrode in which a hydrogen storage alloy powder is supported on a surface of a conductive support by a binder, and the main component of the binder is hydroxyalkylalkylcellulose and / or alkylcellulose. A hydrogen storage alloy electrode, wherein the total amount of the binder is 0.1 to 2.0% by weight of the hydrogen storage alloy.
【請求項2】 少くとも、水素吸蔵合金100重量部
と、1重量%水溶液としたときにおける20℃の粘度が
200cp以上であるヒドロキシアルキルアルキルセル
ロース及び/又はアルキルセルロース0.1〜2.0重
量部とを水に分散したスラリーを、導電性支持体上に塗
布・乾燥することを特徴とする水素吸蔵合金電極の製造
方法。
2. A hydroxyalkylalkylcellulose and / or an alkylcellulose having a viscosity of 200 cp or more at 20 ° C. in an aqueous solution of at least 100 parts by weight of a hydrogen storage alloy and a weight ratio of 0.1 to 2.0 parts by weight. A method for producing a hydrogen storage alloy electrode, characterized in that a slurry in which the parts are dispersed in water is applied and dried on a conductive support.
【請求項3】 ヒドロキシアルキルアルキルセルロース
がヒドロキシプロピルメチルセルロース、ヒドロキシエ
チルメチルセルロース、ヒドロキシエチルエチルセルロ
ースの中から選択される少くとも1種である請求項1に
記載された水素吸蔵合金電極の製造方法。
3. The method for producing a hydrogen storage alloy electrode according to claim 1, wherein the hydroxyalkylalkylcellulose is at least one selected from hydroxypropylmethylcellulose, hydroxyethylmethylcellulose and hydroxyethylethylcellulose.
【請求項4】 アルキルセルロースがメチルセルロース
である、請求項2又は3に記載された水素吸蔵合金電極
の製造方法。
4. The method for producing a hydrogen storage alloy electrode according to claim 2, wherein the alkyl cellulose is methyl cellulose.
JP24727294A 1994-09-14 1994-09-14 Hydrogen storage alloy electrode and method for producing the same Expired - Fee Related JP3150546B2 (en)

Priority Applications (1)

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JP24727294A JP3150546B2 (en) 1994-09-14 1994-09-14 Hydrogen storage alloy electrode and method for producing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24727294A JP3150546B2 (en) 1994-09-14 1994-09-14 Hydrogen storage alloy electrode and method for producing the same

Publications (2)

Publication Number Publication Date
JPH0888001A true JPH0888001A (en) 1996-04-02
JP3150546B2 JP3150546B2 (en) 2001-03-26

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ID=17161004

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3150546B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003157847A (en) * 2001-11-19 2003-05-30 Denso Corp Method of manufacturing electrode for lithium battery and electrode for lithium battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003157847A (en) * 2001-11-19 2003-05-30 Denso Corp Method of manufacturing electrode for lithium battery and electrode for lithium battery

Also Published As

Publication number Publication date
JP3150546B2 (en) 2001-03-26

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