JP2823273B2 - Manufacturing method of hydrogen storage alloy electrode - Google Patents

Manufacturing method of hydrogen storage alloy electrode

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Publication number
JP2823273B2
JP2823273B2 JP1298336A JP29833689A JP2823273B2 JP 2823273 B2 JP2823273 B2 JP 2823273B2 JP 1298336 A JP1298336 A JP 1298336A JP 29833689 A JP29833689 A JP 29833689A JP 2823273 B2 JP2823273 B2 JP 2823273B2
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JP
Japan
Prior art keywords
slurry
hydrogen storage
electrode
storage alloy
polyethylene 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.)
Expired - Lifetime
Application number
JP1298336A
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Japanese (ja)
Other versions
JPH03159066A (en
Inventor
良和 石倉
健次 井上
高士 上田
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.)
Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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Priority to JP1298336A priority Critical patent/JP2823273B2/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/24—Electrodes for alkaline accumulators
    • H01M4/242—Hydrogen storage electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/383—Hydrogen absorbing alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Description

【発明の詳細な説明】 （イ） 産業上の利用分野 本発明は、アルキル蓄電池の負極として用いられ、水
素の可逆的に吸蔵及び放出することのできる水素吸蔵合
金電極の製造方法に関するものである。The present invention relates to a method for producing a hydrogen storage alloy electrode used as a negative electrode of an alkyl storage battery and capable of reversibly storing and releasing hydrogen. .

（ロ） 従来の技術 従来から良く用いられている蓄電池としては、ニッケ
ル−カドミウム蓄電池、あるいは鉛蓄電池などがある
が、近年、これらの電池より軽量且つ高容量で高エネル
ギー密度となる可能性があるということで、水素吸蔵合
金を用いてなる水素吸蔵合金電極を負極に備えた金属−
水素アルカリ蓄電池が注目されている。(B) Conventional technology Conventionally used storage batteries include nickel-cadmium storage batteries and lead storage batteries. In recent years, these batteries may be lighter, have higher capacity, and have higher energy density than these batteries. Thus, a metal having a negative electrode with a hydrogen storage alloy electrode using a hydrogen storage alloy
Attention has been paid to hydrogen-alkaline storage batteries.

ところで、この種水素吸蔵合金電極は、充放電サイク
ルを繰り返すことにより、水素吸蔵合金が微粉化し電極
から脱落して容量低下を招くと共に、電極の機械的強度
の低下を起こし、長期にわたって極板容量を維持するこ
とが困難であるという問題点があった。このため、特開
昭61−66366号公報では、極板の機械的強度を高め、上
記問題点を解決する方法が提案されている。即ち、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など
の複数の結着剤を併用して用い、これらと水素吸蔵合金
粉末とを混練したペーストを、パンチングメタル等の導
電性支持体に塗着して電極を作製することにより、前記
結着剤により水素吸蔵合金を強固に保持することを可能
としている。By the way, in this kind of hydrogen storage alloy electrode, by repeating the charge and discharge cycle, the hydrogen storage alloy is pulverized and falls off from the electrode to cause a decrease in the capacity, and also causes a decrease in the mechanical strength of the electrode, resulting in a long term electrode plate capacity. Is difficult to maintain. For this reason, Japanese Patent Application Laid-Open No. Sho 61-66366 proposes a method for solving the above problem by increasing the mechanical strength of the electrode plate. That is, a plurality of binders such as polytetrafluoroethylene and polyethylene oxide are used in combination, and a paste obtained by kneading these with a hydrogen storage alloy powder is applied to a conductive support such as a punching metal to form an electrode. By manufacturing, the hydrogen storage alloy can be held firmly by the binder.

他方、水素吸蔵合金電極における導電性支持体に合金
を保持させる結着効果をみると、ポリテトラフルオロエ
チレン等のフッ素樹脂結着剤に比べて、ヒドロキシプロ
ピルセルロースやポリエチレンオキサイド等の水溶性高
分子結着剤の方が少量の添加で効果を得ることができ
る。ところが、アルカリ蓄電池用のペースト式電極とし
て従来から結着剤を用いて作製されているペースト式カ
ドミウム極では、前記水溶性高分子結着剤としてポリエ
チレンオキサイドを添加すると、水素発生の過電圧を低
くし、水素ガスが発生し易くなり、カドミウム極の充電
効率を低下させる。このようにペーストカドミウム極で
は結着剤の種類により電池性能を左右されることがあ
り、一般にヒドロキシプロピルセルロース等を結着剤と
して使用することが多い。On the other hand, when examining the binding effect of holding the alloy on the conductive support in the hydrogen storage alloy electrode, the water-soluble polymer such as hydroxypropylcellulose and polyethylene oxide is compared with the fluororesin binder such as polytetrafluoroethylene. The effect of the binder can be obtained with a small amount of addition. However, in a paste-type cadmium electrode conventionally manufactured using a binder as a paste-type electrode for an alkaline storage battery, the addition of polyethylene oxide as the water-soluble polymer binder reduces the overvoltage of hydrogen generation. In addition, hydrogen gas is easily generated, and the charging efficiency of the cadmium electrode is reduced. As described above, in the paste cadmium electrode, the battery performance may be affected by the type of the binder, and generally, hydroxypropyl cellulose or the like is often used as the binder.

そして一方、結着剤としてポリエチレンオキサイドを
用いた場合、ヒドロキシプロピルセルロース等を用いた
場合に比べて、粘性が高く、結着効果も高いので、少量
の添加で十分なスラリー粘度と結着力を得ることができ
る。しかし、このポリエチレンオキサイドは、酸性域即
ちpHの値が２乃至５未満における安定性が悪く、分子が
分解する。通常、水素吸蔵合金粉末を含むスラリーの混
練に用いる水は、溶解イオンの少ないイオン交換水を用
いている。このイオン交換水は、空気中のCO2ガスを吸
収し、pH値が４〜５となる。この状態のイオン交換水を
スラリー混練時に用いると、スラリーが酸性域になるた
め、ポリエチレンオキサイドが分解され、スラリー粘度
が安定せず製造工程の管理が複雑となり、さらに電極強
度を十分に維持することができない。On the other hand, when polyethylene oxide is used as the binder, compared to the case where hydroxypropyl cellulose or the like is used, since the viscosity is high and the binding effect is high, sufficient slurry viscosity and binding force can be obtained with a small amount of addition. be able to. However, this polyethylene oxide has poor stability in an acidic region, that is, a pH value of less than 2 to 5, and the molecule is decomposed. Usually, ion-exchanged water having a small amount of dissolved ions is used as water for kneading the slurry containing the hydrogen storage alloy powder. This ion-exchanged water absorbs CO 2 gas in the air, and has a pH value of 4 to 5. When the ion-exchanged water in this state is used at the time of kneading the slurry, the slurry is in an acidic range, polyethylene oxide is decomposed, the viscosity of the slurry is not stabilized, the management of the manufacturing process is complicated, and the electrode strength is sufficiently maintained. Can not.

（ハ） 発明が解決しようとする課題 本発明は前記問題点に鑑みてなされたものであって、
スラリー混練中においてポリエチレンオキサイドの分解
に起因せるスラリー性状の変化を抑制し、機械的強度を
十分に維持しサイクル特性を発揮しうる水素吸蔵合金電
極の製造方法を提案するものである。(C) Problems to be solved by the invention The present invention has been made in view of the above problems,
An object of the present invention is to provide a method for manufacturing a hydrogen storage alloy electrode capable of suppressing a change in slurry properties due to the decomposition of polyethylene oxide during slurry kneading, maintaining sufficient mechanical strength, and exhibiting cycle characteristics.

（ニ） 課題を解決するための手段 本発明の水素吸蔵合金の製造方法は、水素吸蔵合金粉
末と少なくともポリエチレンオキサイドを含む結着剤と
分散媒とを混練したスラリーを作製しこのスラリーを導
電性支持体に保持させる製造方法であって、前記結着剤
の総量が前記合金に対して５重量％以下であり且つ前記
ポリエチレンオキサイドが前記合金に対して少なくとも
0.1重量％以上添加されており、前記スラリーのpHを5.0
以上とすることを特徴とするものである。(D) Means for Solving the Problems In the method for producing a hydrogen storage alloy of the present invention, a slurry is prepared by kneading a hydrogen storage alloy powder, a binder containing at least polyethylene oxide, and a dispersion medium. A method for producing a support, wherein the total amount of the binder is 5% by weight or less based on the alloy, and the polyethylene oxide is at least
0.1% by weight or more, and the pH of the slurry is adjusted to 5.0
It is characterized by the above.

ここで、前記スラリーの粘度としては、10,000〜100,
000mPa・Ｓとするのが望ましい。Here, the viscosity of the slurry is 10,000 to 100,
It is desirable to be 000 mPa · S.

（ホ） 作用 本発明者は、水素吸蔵合金粉末を含むスラリーをpH＝
5.0以上とすることにより、ポリエチレンオキサイドの
分解が抑制されることを見い出し、本発明を完成するに
至ったものである。この結果、スラリーの性状が安定
し、粘度の変化も抑制できるので、製造工程上極めて有
効である。更に、ポリエチレンオキサイドの分解が抑制
されているので、その使用量を少なくすることが可能と
なり、機械強度が高く優れたサイクル特性を発揮しうる
水素吸蔵合金電極を提供できる。(E) Action The present inventors prepared a slurry containing a hydrogen storage alloy powder at pH =
It has been found that by setting the ratio to 5.0 or more, the decomposition of polyethylene oxide is suppressed, and the present invention has been completed. As a result, the properties of the slurry are stabilized, and the change in viscosity can be suppressed, which is extremely effective in the production process. Furthermore, since the decomposition of polyethylene oxide is suppressed, it is possible to reduce the amount of use, and it is possible to provide a hydrogen storage alloy electrode having high mechanical strength and exhibiting excellent cycle characteristics.

尚、スラリーのpH調整は、例えばイオン交換水に苛性
カリ（KOH）等を添加することにより、行うことが可能
である。The pH of the slurry can be adjusted, for example, by adding caustic potash (KOH) or the like to ion-exchanged water.

また、結着剤としては、ポリエチレンオキサイド単独
またはポリエチレンオキサイドと他の結着剤との組み合
わせで用いても良いが、結着剤の総量が水素吸蔵合金に
対して５重量％を超えると、電極の導電性が低下すると
同時に結着剤が水素吸蔵合金表面を被覆して水素の吸蔵
効率を低下させるため、５重量％以下にする必要があ
る。As the binder, polyethylene oxide alone or a combination of polyethylene oxide and another binder may be used. However, if the total amount of the binder exceeds 5% by weight with respect to the hydrogen storage alloy, the electrode may be used. In addition, the binder must cover the surface of the hydrogen-absorbing alloy to lower the hydrogen-absorbing efficiency at the same time as the conductivity of the hydrogen-absorbing alloy decreases.

（ヘ） 実施例 本発明の実施例を以下に説明し、比較例との対比に言
及する。(F) Examples Examples of the present invention will be described below, and reference will be made to comparisons with comparative examples.

［実施例１］ 市販されているミッシュメタル（Mm）、ニッケル、コ
バルト、マンガンの原料を一定の組成比に秤量し、アー
ク溶解炉を用いて組成式MmNi3Co1.2Mn0.6で表わされる
合金を作製した後、機械的に粉砕して平均粒径50μｍの
水素吸蔵合金粉末を得た。次いで、この水素吸蔵合金に
対し１重量％のポリエチレンオキサイドと、イオン交換
水（KOH調整によりpH＝８としたもの）を前記合金粉末
に加え、混練し、30,000mPa・Ｓの粘度のスラリーを作
製した。尚、スラリーの粘度は、東京計器（株）製Ｂ型
粘度計B8u型を使用し、スピンドルＴ−Ｂ、回転速度20r
・ｐ・ｍで測定した値である。[Example 1] misch commercially available metal (Mm), nickel, cobalt, manganese raw material was weighed into a predetermined composition ratio, the alloy represented by the composition formula MmNi 3 Co 1.2 Mn 0.6 using an arc melting furnace After the preparation, it was pulverized mechanically to obtain a hydrogen storage alloy powder having an average particle diameter of 50 μm. Next, 1% by weight of polyethylene oxide and ion-exchanged water (pH adjusted to 8 by KOH adjustment) were added to the alloy powder and kneaded to prepare a slurry having a viscosity of 30,000 mPa · S. did. The viscosity of the slurry was measured using a B8u type B-type viscometer manufactured by Tokyo Keiki Co., Ltd., with a spindle TB and a rotation speed of 20r.
・ Value measured in p · m.

ここにおいて、スラリーのpH値は、添加せるイオン交
換水の量が多く、イオン交換水のpH値と一致している。Here, the pH value of the slurry coincides with the pH value of the ion-exchanged water because the amount of the ion-exchanged water to be added is large.

このようにして作製したスラリーを容器内に入れ、こ
の容器内にニッケルメッキを施したパンチングメタルか
らなる導電性支持体を通過させ引き上げることにより、
支持体表面に前記スラリーを塗着し、乾燥及び加圧を行
ない、本発明による水素吸蔵合金電極を得た。The slurry thus prepared is put in a container, and the container is passed through a conductive support made of punched metal plated with nickel and pulled up.
The slurry was applied to the surface of the support, dried and pressed to obtain a hydrogen storage alloy electrode according to the present invention.

この電極を負極とし、正極として焼結式ニッケル極を
使用して、これらの正極、負極の間に不織布からなるセ
パレータを介して、捲回することにより渦巻電極体を得
た。そして、この渦巻電極体を電池外装缶に挿入し、30
重量％のKOH水溶液を電解液として注液した後、封口し
て、公称容量1200mAhの密閉型ニッケル・水素アルカリ
蓄電池を作製し、本発明電池Ａとする。This electrode was used as a negative electrode, and a sintered nickel electrode was used as a positive electrode, and a spiral electrode body was obtained by winding between the positive electrode and the negative electrode with a separator made of nonwoven fabric interposed therebetween. Then, insert this spiral electrode body into the battery outer can, and
After injecting a weight% KOH aqueous solution as an electrolytic solution, the container is sealed, and a sealed nickel-hydrogen alkaline storage battery having a nominal capacity of 1200 mAh is manufactured.

［比較例］ 前記実施例１において用いたイオン交換水を用いず、
KOH調整していないpH＝4.0のイオン交換水を用いること
を除いて、他は同様の方法でスラリーを作製した。Comparative Example Without using the ion-exchanged water used in Example 1,
A slurry was prepared in the same manner except that ion-exchanged water of pH = 4.0 without KOH adjustment was used.

このスラリーを用い、前記同様の水素吸蔵合金電極を
得、比較電池ａを作製した。Using this slurry, a hydrogen storage alloy electrode similar to that described above was obtained, and Comparative Battery a was produced.

◎ 実験１ 前記実施例１、比較例１で用いた、スラリーの保管時
間とスラリー粘度との関係を調べた。この結果を、第１
図に示す。実 験 Experiment 1 The relationship between the storage time of the slurry and the viscosity of the slurry used in Example 1 and Comparative Example 1 was examined. This result is
Shown in the figure.

これより、pH＝８としたイオン交換水を用いた実施例
１のスラリーの粘度変化は、保管日数が10日経っても、
ほとんど生じず。極めて安定したものであることが理解
できる。一方、比較例で用いたスラリーは、ポリエチレ
ンオキサイドの分解に起因して、粘度変化が生じている
と考えられる。From this, the viscosity change of the slurry of Example 1 using the ion-exchanged water with pH = 8 shows that even if the storage days have passed 10 days,
Almost never. It can be understood that it is extremely stable. On the other hand, the slurry used in the comparative example is considered to have a change in viscosity due to the decomposition of polyethylene oxide.

◎ 実験２ ここではスラリーに添加せるイオン交換水のpH値と、
ポリエチレンオキサイドの使用量を種々変化させ、水素
吸蔵合金電極を作製し、電池を組み立て、サイクル特性
を比較した。◎ Experiment 2 Here, the pH value of ion-exchanged water to be added to the slurry,
Various amounts of polyethylene oxide were used to prepare hydrogen storage alloy electrodes, batteries were assembled, and cycle characteristics were compared.

下記のグループ１ではポリエチレンオキサイドの量を
水素吸蔵合金粉末に対して１重量％としてpHを変化させ
た場合、グループ２ではポリエチレンオキサイドの量を
0.1重量％としてpHを変化させた場合、グループ３では
ポリエチレンオキサイドの量を0.05重量％としてpHを変
化させた場合、グループ４ではポリエチレンオキサイド
の量を0.5重量％としてpHを変化させた場合を、それぞ
れ示した。In Group 1 below, when the pH was changed with the amount of polyethylene oxide being 1% by weight based on the hydrogen storage alloy powder, in Group 2, the amount of polyethylene oxide was changed.
When the pH was changed to 0.1% by weight, in Group 3, the pH was changed to 0.05% by weight of polyethylene oxide, and in Group 4, the pH was changed to 0.5% by weight of polyethylene oxide, Each is shown.

（グループ１） 前記本発明電池Ａ及び比較電池ａを用い、グループ１
とした。(Group 1) Group 1 using the battery A of the present invention and the comparative battery a.
And

（グループ２） 前記実施例１において使用せるポリエチレンオキサイ
ドの量を0.1重量％とし、スラリー中へ添加せるイオン
交換水のpHを、4.0,5.0,8.0,10.0と種々変化させ、水素
吸蔵合金電極を、それぞれ得た。そして前記実施例１と
同様にして、比較電池ｂ、本発明電池B1、本発明電池
B2、本発明電池B3を作製した。(Group 2) The amount of polyethylene oxide used in Example 1 was set to 0.1% by weight, and the pH of ion-exchanged water added to the slurry was variously changed to 4.0, 5.0, 8.0, 10.0, and the hydrogen storage alloy electrode was used. , Respectively. And in the same manner as in Example 1, Comparative Battery b, the present invention cell B 1, the present invention battery
B 2 and the battery B 3 of the present invention were produced.

（グループ３） 前記実施例１において使用せるポリエチレンオキサイ
ドの量を0.05重量％とし、スラリー中へ添加せるイオン
交換水のpHを、4.0,5.0,8.0,10.0と種々変化させ、水素
吸蔵合金電極を、それぞれ得た。そして前記同様にし
て、比較電池c1、比較電c2、比較電池c3、比較電池c4を
作製した。(Group 3) The amount of polyethylene oxide used in Example 1 was set to 0.05% by weight, and the pH of ion-exchanged water added to the slurry was variously changed to 4.0, 5.0, 8.0, 10.0 to form a hydrogen storage alloy electrode. , Respectively. And wherein in the same manner, Comparative Battery c 1, Comparative electrostatic c 2, Comparative Battery c 3, to prepare a comparison battery c 4.

（グループ４） 前記実施例１において使用せるポリエチレンオキサイ
ドの量を0.5重量％とし、スラリー中へ添加せるイオン
交換水のpHを4.0,5.0,8.0,10.0と種々変化させ、水素吸
蔵合金電極を、それぞれ得た。そして前記同様にして、
比較電池ｄ、本発明電池D1、本発明電池D2、本発明電池
D3を作製した。(Group 4) The amount of polyethylene oxide used in Example 1 was 0.5% by weight, and the pH of ion-exchanged water to be added to the slurry was variously changed to 4.0, 5.0, 8.0, and 10.0. Got each. And like above,
Comparative battery d, inventive battery D 1 , inventive battery D 2 , inventive battery
To prepare a D 3.

この様にして作製した各電池を用い、電池のサイクル
特性を比較した。この時のサイクル条件は、各電池を60
0mAの電流で2.5時間充電した後、600mAの電流で放電
し、電池電圧が1.0Vに達した時点で放電を終了するとい
うものである。そして、電池の放電容量が初期容量の50
％に達したサイクル数を、サイクル寿命とした。この結
果を、第１表に示す。Using the batteries thus manufactured, the cycle characteristics of the batteries were compared. At this time, the cycle condition is
The battery is charged at a current of 0 mA for 2.5 hours, then discharged at a current of 600 mA, and terminated when the battery voltage reaches 1.0 V. And the discharge capacity of the battery is 50 times the initial capacity.
% Is defined as the cycle life. The results are shown in Table 1.

第１表より、本発明電池Ａ、B1、B2、B3、D1、D2、D3
は、比較電池ａ、ｂ、c1、c2、c3、c4、ｄに比べて、サ
イクル特性において優れたものであることが理解でき
る。 Table 1 shows that the batteries A, B 1 , B 2 , B 3 , D 1 , D 2 , D 3
It can be understood that is superior in cycle characteristics as compared with comparative batteries a, b, c 1 , c 2 , c 3 , c 4 , and d.

このように本発明電池の特性が優れているので、結着
剤として添加せるポリエチレンオキサイドのスラリー中
における分解が抑制され、結着力を高いままに維持する
ことが可能となり、優れた電極強度をサイクル長期に亘
って発揮していることに基づくと考えられる。As described above, since the characteristics of the battery of the present invention are excellent, the decomposition of the polyethylene oxide added as a binder in the slurry is suppressed, and the binding force can be maintained at a high level. It is thought to be based on long-term achievement.

尚、比較電池c1、c2、c3、c4のグループ３において
は、添加使用せるポリエチレンオキサイドの量が0.05重
量％と少なく、十分な電極強度が得られない。Incidentally, in Group 3 of comparative batteries c 1 , c 2 , c 3 and c 4 , the amount of polyethylene oxide to be added and used was as small as 0.05% by weight, and sufficient electrode strength could not be obtained.

したがって、ポリエチレンオキサイドの使用下限は、
水素吸蔵合金粉末に対して0.1重量％以上とするのが必
要である。Therefore, the lower limit of the use of polyethylene oxide,
It is necessary that the content be 0.1% by weight or more based on the hydrogen storage alloy powder.

また、スラリーの粘度については、上記実施例では3
0,000mPa・Ｓのものを使用したが、本発明者らの詳細な
検討の結果、粘度が100,000mPa・Ｓを超えた場合及び1
0,000mPa・Ｓ以下の場合は、スラリーを導電性支持体に
均一に塗着し、保持させることができなかった。これは
水素吸蔵合金粉末の粒子形状がくさび形であるため、非
常に流動性が悪く、また真比重が8.0以上と非常に重い
事に起因すると考えられる。The viscosity of the slurry was 3 in the above example.
The viscosity was more than 100,000 mPa · S as a result of detailed studies by the present inventors.
When the pressure was less than 000 mPa · S, the slurry could not be uniformly applied to and held on the conductive support. This is considered to be due to the fact that the hydrogen storage alloy powder has a wedge shape, so that the fluidity is very poor and the true specific gravity is 8.0 or more, which is very heavy.

以上の結果より、スラリー粘度は10,000mPa・Ｓ以上
で100,000mPa・Ｓ以下であることが望ましい。From the above results, it is desirable that the slurry viscosity is not less than 10,000 mPa · S and not more than 100,000 mPa · S.

この実施例では、水素吸蔵合金として希土類系の水素
吸蔵合金を使用したが、この合金系に限定されるもので
はない。In this embodiment, a rare earth-based hydrogen storage alloy was used as the hydrogen storage alloy. However, the present invention is not limited to this alloy storage alloy.

更に、スラリーのpH調整、即ちイオン交換水のpH調整
をKOHで行ったがKOHに限らず、NaOH、LiOH等を用いても
良い。Further, the pH adjustment of the slurry, that is, the pH adjustment of the ion-exchanged water was performed with KOH, but not limited to KOH, but NaOH, LiOH or the like may be used.

（ト） 発明の効果 本発明の水素吸蔵合金電極の製造方法によれば、スラ
リー中に結着剤として添加せるポリエチレンオキサイド
の分解を抑制することができるので、電極の製造工程管
理を簡素化でき、またかかる電極を用いることによりサ
イクル特性に優れたアルカリ蓄電池が提供でき、その工
業的価値は極めて大きい。(G) Effect of the Invention According to the method for producing a hydrogen storage alloy electrode of the present invention, it is possible to suppress the decomposition of polyethylene oxide to be added as a binder in the slurry, so that the production process management of the electrode can be simplified. Also, by using such an electrode, an alkaline storage battery having excellent cycle characteristics can be provided, and its industrial value is extremely large.

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

第１図は、スラリーの保存時間と粘度との関係を示す図
である。FIG. 1 is a diagram showing a relationship between storage time and viscosity of a slurry.

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H01M 4/24 - 4/26 H01M 4/62──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) H01M 4/24-4/26 H01M 4/62

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】水素吸蔵合金粉末と少なくともポリエチレ
ンオキサイドを含む結着剤と分散媒とを混練したスラリ
ーを作製しこのスラリーを導電性支持体に保持させる電
極の製造方法であって、 前記結着剤の総量が前記合金に対して５重量％以下であ
り且つ前記ポリエチレンオキサイドが前記合金に対して
少なくとも0.1重量％以上添加されており、 前記スラリーのpHを5.0以上とすることを特徴とする水
素吸蔵合金電極の製造方法。1. A method for producing an electrode, comprising preparing a slurry in which a hydrogen storage alloy powder, a binder containing at least polyethylene oxide and a dispersion medium are kneaded, and holding the slurry on a conductive support. Hydrogen, wherein the total amount of the agent is 5% by weight or less based on the alloy, the polyethylene oxide is added at least 0.1% by weight or more based on the alloy, and the pH of the slurry is 5.0 or more. Manufacturing method of occlusion alloy electrode. 【請求項２】前記スラリーの粘度が10,000〜100,000mPa
・Ｓである請求項（１）記載の水素吸蔵合金電極の製造
方法。2. The slurry has a viscosity of 10,000 to 100,000 mPa.
The method for producing a hydrogen storage alloy electrode according to claim 1, wherein S is S.
JP1298336A 1989-11-16 1989-11-16 Manufacturing method of hydrogen storage alloy electrode Expired - Lifetime JP2823273B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1298336A JP2823273B2 (en) 1989-11-16 1989-11-16 Manufacturing method of hydrogen storage alloy electrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1298336A JP2823273B2 (en) 1989-11-16 1989-11-16 Manufacturing method of hydrogen storage alloy electrode

Publications (2)

Publication Number Publication Date
JPH03159066A JPH03159066A (en) 1991-07-09
JP2823273B2 true JP2823273B2 (en) 1998-11-11

Family

ID=17858348

Family Applications (1)

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Country Link
JP (1) JP2823273B2 (en)

Also Published As

Publication number Publication date
JPH03159066A (en) 1991-07-09

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