JP3138120B2 - Metal hydride storage battery - Google Patents
Metal hydride storage batteryInfo
- Publication number
- JP3138120B2 JP3138120B2 JP05206385A JP20638593A JP3138120B2 JP 3138120 B2 JP3138120 B2 JP 3138120B2 JP 05206385 A JP05206385 A JP 05206385A JP 20638593 A JP20638593 A JP 20638593A JP 3138120 B2 JP3138120 B2 JP 3138120B2
- Authority
- JP
- Japan
- Prior art keywords
- hydrogen storage
- molecular weight
- average molecular
- ptfe
- electrode
- 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
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Classifications
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- 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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Description
【０００１】[0001]
【産業上の利用分野】本発明は、負極活物質である水素
を可逆的に吸蔵及び放出することのできる水素吸蔵合金
を備えた金属水素化物蓄電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal hydride storage battery provided with a hydrogen storage alloy capable of reversibly storing and releasing hydrogen as a negative electrode active material.
【０００２】[0002]
【従来の技術】従来からよく用いられる蓄電池としては
鉛電池及びニッケル−カドミウム電池が挙げられる。近
年これらの電池より軽量で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、負極活物質である
水素を可逆的に吸蔵及び放出することのできる水素吸蔵
合金粉末を備えた電極を負極に用い、水酸化ニッケル等
の金属酸化物を正極活物質とする電極を正極に用いた金
属水素化物蓄電池が注目されている。2. Description of the Prior Art Lead batteries and nickel-cadmium batteries have been widely used as conventional storage batteries. In recent years, these batteries are lighter and have a higher capacity and a higher energy density than those batteries.Therefore, an electrode provided with a hydrogen storage alloy powder capable of reversibly storing and releasing hydrogen as a negative electrode active material has been developed. Attention has been focused on a metal hydride storage battery using a negative electrode and an electrode using a metal oxide such as nickel hydroxide as a positive electrode active material as a positive electrode.
【０００３】この金属水素化物蓄電池の負極に用いる水
素吸蔵電極は、特開平６１−６６３６６号公報に開示さ
れているように、ポリビニルアルコールやポリエチレン
オキサイド等の水溶性高分子やポリテトラフルオロエチ
レン（以下ＰＴＦＥと云う）等の合成樹脂を結着剤とし
て、水素吸蔵合金粉末に添加、混練してペーストを作製
し、パンチングメタルやエキスパンドメタル等の芯体に
前記ペーストを塗着、乾燥して作製される。As disclosed in Japanese Patent Application Laid-Open No. 61-66366, water-soluble polymers such as polyvinyl alcohol and polyethylene oxide and polytetrafluoroethylene (hereinafter referred to as "polytetrafluoroethylene") are used for a negative electrode of the metal hydride storage battery. A synthetic resin such as PTFE) is used as a binder, added to the hydrogen storage alloy powder, kneaded to produce a paste, and the paste is applied to a core such as punched metal or expanded metal and dried to produce a paste. You.
【０００４】ここで、前記水溶性高分子を結着剤にした
場合、水素吸蔵合金の表面に高分子の膜を形成する場合
が多く、合金本来の充放電特性を阻害する。Here, when the water-soluble polymer is used as a binder, a polymer film is often formed on the surface of the hydrogen storage alloy, which hinders the charge / discharge characteristics inherent in the alloy.
【０００５】一方、ＰＴＦＥを結着剤として使用する
と、ＰＴＦＥの繊維化したものが、水素吸蔵合金を三次
元的網状構造内に保持する形態となるため、合金表面が
露出し、前記水溶性高分子を結着剤にした場合に比べ
て、合金本来の充放電特性は阻害されにくい。On the other hand, when PTFE is used as a binder, fibrous PTFE becomes a form in which the hydrogen storage alloy is held in a three-dimensional network structure. Compared to the case where molecules are used as a binder, the original charge / discharge characteristics of the alloy are less likely to be inhibited.
【０００６】しかしながら、従来より結着剤として用い
られてきた標準的なＰＴＦＥは平均分子量が１０００万
程度と大きく、このようなＰＴＦＥは非常に繊維化され
やすいものである。このため、水素吸蔵合金粉末と混練
して活物質スラリーを作製する際に、活物質スラリー粘
度が急激に上昇するので、芯体に均一に塗着できず、活
物質充填密度が低下するという不都合がある。[0006] However, standard PTFE which has been conventionally used as a binder has a large average molecular weight of about 10 million, and such PTFE is very easily fiberized. For this reason, when the active material slurry is produced by kneading with the hydrogen storage alloy powder, the viscosity of the active material slurry sharply increases, so that the active material slurry cannot be uniformly applied to the core body and the active material filling density decreases. There is.
【０００７】更に、平均分子量の高いＰＴＦＥは、粒子
同士凝集しやすい性質を持っているため大きな粒子を形
成しやすい。その大きな粒子は、電極を作製する際の圧
延などにより、潰れて水素吸蔵合金表面上に膜を形成
し、合金本来の酸素ガス消費ができなくなり電池内圧上
昇の原因となる。この内圧上昇にともない、充電末期に
電池内から酸素ガス及び水素ガスが放出される際に、電
解液が漏れて、電解液が減少するためにサイクル寿命が
低下するという問題があった。Further, PTFE having a high average molecular weight has a property that particles are easily aggregated with each other, so that large particles are easily formed. The large particles are crushed by rolling or the like at the time of manufacturing the electrode and form a film on the surface of the hydrogen storage alloy, and the oxygen gas inherent in the alloy cannot be consumed, causing an increase in the internal pressure of the battery. When oxygen gas and hydrogen gas are released from the battery at the end of charging due to the increase of the internal pressure, there is a problem that the electrolyte leaks and the amount of the electrolyte decreases, thereby reducing the cycle life.
【０００８】また、フッ素樹脂として繊維化しないテト
ラフルオロエチレン−ヘキサフルオロプロピレン共重合
体（以下ＦＥＰと云う）を用いた場合は、スラリーの繊
維化は起こらず、芯体に均一に塗着しやすいが、極板の
強度を充分得ることができず、充放電サイクルを繰り返
す内に水素吸蔵合金の脱落が生じ、サイクル寿命低下の
原因となっていた。When a non-fibrous tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter referred to as FEP) is used as the fluororesin, the slurry does not fibrillate and is easily applied uniformly to the core. However, sufficient strength of the electrode plate could not be obtained, and the hydrogen storage alloy fell off during repeated charge / discharge cycles, leading to a reduction in cycle life.
【０００９】[0009]
【発明が解決しようとする課題】本発明は上記に鑑みて
成されたものであり、金属水素化物蓄電池の負極として
用いられる水素吸蔵電極の活物質充填密度と機械的強度
の向上、及び電池内圧に起因する電池のサイクル寿命特
性を向上させようとすることを本発明の課題とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has been made to improve the active material filling density and mechanical strength of a hydrogen storage electrode used as a negative electrode of a metal hydride storage battery, and to improve the internal pressure of the battery. An object of the present invention is to improve the cycle life characteristics of a battery caused by the above.
【００１０】[0010]
【課題を解決するための手段】本発明の金属水素化物蓄
電池は、水素吸蔵電極が結着剤として平均分子量が１０
万以上３００万以下のポリテトラフルオロエチレンを含
有することを特徴とする。According to the metal hydride storage battery of the present invention, the hydrogen storage electrode has an average molecular weight of 10 as a binder.
It is characterized by containing not less than 10,000 and not more than 3,000,000 polytetrafluoroethylene.
【００１１】[0011]
【作用】結着剤であるＰＴＦＥの平均分子量が、従来の
様に１０００万程度であると、水素吸蔵合金粉末を主成
分とする活物質スラリー作製時に、ＰＴＦＥの繊維化が
起こり、粘度が著しく上昇するために、安定した活物質
スラリーを作製することができない。When the average molecular weight of PTFE as a binder is about 10 million as in the prior art, when an active material slurry containing a hydrogen storage alloy powder as a main component is produced, the PTFE fiberizes and the viscosity is remarkably increased. As a result, a stable active material slurry cannot be produced.
【００１２】この結果、活物質スラリーを芯体に均一に
塗着できず、活物質充填密度の低下を招く。また、ＰＴ
ＦＥの粒子同士の凝集が起きやすくなり、大きな粒子を
形成し、それが圧延等で押し潰されて水素吸蔵合金表面
を膜状に覆ってしまうため、酸素ガス消費が阻害され
る。As a result, the active material slurry cannot be uniformly applied to the core, resulting in a decrease in the active material packing density. Also, PT
Aggregation of FE particles is likely to occur, and large particles are formed, which are crushed by rolling or the like and cover the surface of the hydrogen storage alloy in a film-like manner, thereby inhibiting oxygen gas consumption.
【００１３】これに対して、本発明ではＰＴＦＥの平均
分子量を３００万以下にしているため、活物質スラリー
を作製中に繊維化するＰＴＦＥが少なく、急激な粘度変
化を起こさないので、安定した活物質スラリーを得るこ
とができる。この結果、活物質スラリーを容易に芯体に
均一に塗着することができ、活物質充填密度が向上す
る。On the other hand, in the present invention, the average molecular weight of PTFE is set to 3,000,000 or less, so that the PTFE fiberized during the preparation of the active material slurry is small, and the viscosity does not change suddenly. A substance slurry can be obtained. As a result, the active material slurry can be easily and uniformly applied to the core, and the active material filling density is improved.
【００１４】また、平均分子量が３００万以下であれ
ば、ＰＴＦＥの粒子同士の凝集が起きにくく、水素吸蔵
合金表面上に膜が形成されることも少ないため、合金本
来の酸素ガス消費を妨げることもない。If the average molecular weight is 3,000,000 or less, PTFE particles hardly aggregate, and a film is rarely formed on the surface of the hydrogen storage alloy. Nor.
【００１５】従って、酸素ガス発生に起因する電池内圧
の上昇を押さえることができ、電池内圧の上昇による内
部ガスの電池外への放出と、その内部ガスの電池外への
放出の際に起こる電解液の漏洩とを防止することができ
るので、サイクル寿命の長い電池が得られる。Therefore, it is possible to suppress the increase in the internal pressure of the battery caused by the generation of oxygen gas, and to release the internal gas to the outside of the battery due to the increase in the internal pressure of the battery and the electrolytic gas generated when the internal gas is released to the outside of the battery. Since leakage of the liquid can be prevented, a battery having a long cycle life can be obtained.
【００１６】但し、ＰＴＦＥの平均分子量が１０万未満
になると、繊維化が起きにくく、三次元的網状構造の形
成による活物質の保持力の向上が得られないため、活物
質の極板からの脱落が著しくなり、極板の機械的強度の
低下を招く。従って、ＰＴＦＥの平均分子量が１０万以
上３００万以下が好ましい。However, if the average molecular weight of PTFE is less than 100,000, fibrillation is unlikely to occur, and it is not possible to improve the holding power of the active material by forming a three-dimensional network structure. Dropping becomes remarkable and causes a decrease in mechanical strength of the electrode plate. Therefore, the average molecular weight of PTFE is preferably 100,000 or more and 3,000,000 or less.
【００１７】[0017]
【実施例】以下に本発明の実施例を詳述する。Embodiments of the present invention will be described below in detail.
【００１８】最初に、水素吸蔵合金の原料金属として、
市販のミッシュメタル（Ｍｍ、希土類元素の混合物）、
ニッケル、コバルト、アルミニウム、マンガンが、元素
比１．０：３．２：１．０：０．２：０．６となるよう
に秤量した後、高周波誘導炉内で溶解、鋳造する。これ
により、ＭｍＮｉ3.2ＣｏＡｌ0.2Ｍｎ0.6という組成の
水素吸蔵合金を得た。次いで、この金属塊を機械的に粉
砕して平均粒径が５０μｍの水素吸蔵合金粉末を作製し
た。First, as a raw material metal of the hydrogen storage alloy,
Commercial misch metal (Mm, mixture of rare earth elements),
Nickel, cobalt, aluminum, and manganese are weighed so that the element ratio becomes 1.0: 3.2: 1.0: 0.2: 0.6, and then melted and cast in a high-frequency induction furnace. As a result, a hydrogen storage alloy having a composition of MmNi 3.2 CoAl 0.2 Mn 0.6 was obtained. Next, this metal lump was mechanically pulverized to produce a hydrogen storage alloy powder having an average particle diameter of 50 μm.
【００１９】（実施例１）前記水素吸蔵合金粉末に対し
て、平均分子量が１０万のＰＴＦＥを、固形分で１０重
量部と純水を１０重量部を前記水素吸蔵合金粉末に添加
し、充分混合して活物質スラリーを作製した。(Example 1) PTFE having an average molecular weight of 100,000, 10 parts by weight of solid content, and 10 parts by weight of pure water were added to the hydrogen storage alloy powder to the hydrogen storage alloy powder. The mixture was mixed to prepare an active material slurry.
【００２０】このスラリーをパンチングメタルからなる
芯体表面に塗着した後、乾燥及び加圧を行い水素吸蔵電
極ａを作製した。This slurry was applied to the surface of a core made of punching metal, and then dried and pressed to produce a hydrogen storage electrode a.
【００２１】（実施例２）平均分子量が１０万のＰＴＦ
Ｅの代わりに、平均分子量が１００万のＰＴＦＥを用い
た他は、前記実施例１と同様にして水素吸蔵電極ｂを作
製した。(Example 2) PTF having an average molecular weight of 100,000
A hydrogen storage electrode b was produced in the same manner as in Example 1 except that PTFE having an average molecular weight of 1,000,000 was used instead of E.
【００２２】（実施例３）平均分子量が１０万のＰＴＦ
Ｅの代わりに、平均分子量が３００万のＰＴＦＥを用い
た他は、前記実施例１と同様にして水素吸蔵電極ｃを作
製した。Example 3 PTF having an average molecular weight of 100,000
A hydrogen storage electrode c was prepared in the same manner as in Example 1 except that PTFE having an average molecular weight of 3,000,000 was used instead of E.
【００２３】（比較例１）平均分子量が１０万のＰＴＦ
Ｅの代わりに、平均分子量が１万のＰＴＦＥを用いた他
は、前記実施例１と同様にして水素吸蔵電極ｖを作製し
た。Comparative Example 1 PTF having an average molecular weight of 100,000
A hydrogen storage electrode v was produced in the same manner as in Example 1 except that PTFE having an average molecular weight of 10,000 was used instead of E.
【００２４】（比較例２）平均分子量が１０万のＰＴＦ
Ｅの代わりに、平均分子量が８万のＰＴＦＥを用いた他
は、前記実施例１と同様にして水素吸蔵電極ｗを作製し
た。Comparative Example 2 PTF having an average molecular weight of 100,000
A hydrogen storage electrode w was produced in the same manner as in Example 1 except that PTFE having an average molecular weight of 80,000 was used instead of E.
【００２５】（比較例３）平均分子量が１０万のＰＴＦ
Ｅの代わりに、平均分子量が６００万のＰＴＦＥを用い
た他は、前記実施例１と同様にして水素吸蔵電極ｘを作
製した。Comparative Example 3 PTF having an average molecular weight of 100,000
A hydrogen storage electrode x was produced in the same manner as in Example 1 except that PTFE having an average molecular weight of 6,000,000 was used instead of E.
【００２６】（比較例４）平均分子量が１０万のＰＴＦ
Ｅの代わりに、平均分子量が１０００万のＰＴＦＥを用
いた他は、前記実施例１と同様にして水素吸蔵電極ｙを
作製した。Comparative Example 4 PTF having an average molecular weight of 100,000
A hydrogen storage electrode y was produced in the same manner as in Example 1 except that PTFE having an average molecular weight of 10,000,000 was used instead of E.
【００２７】（比較例５）平均分子量が１０万のＰＴＦ
Ｅの代わりに、平均分子量が１００万のＦＥＰを用いた
他は、前記実施例１と同様にして水素吸蔵電極ｚを作製
した。Comparative Example 5 PTF having an average molecular weight of 100,000
A hydrogen storage electrode z was produced in the same manner as in Example 1 except that FEP having an average molecular weight of 1,000,000 was used instead of E.
【００２８】前記水素吸蔵電極ａ〜ｃ、ｖ〜ｚについ
て、電極の機械的強度を測定した結果を図１に示す。こ
こで、電極の機械的強度の試験は、ＪＩＳ Ｋ５４００
基盤目試験に基いて行った。この試験の概略を以下に記
す。FIG. 1 shows the results of measuring the mechanical strength of the hydrogen storage electrodes a to c and v to z. Here, the test of the mechanical strength of the electrode is performed according to JIS K5400.
The test was performed based on a basement test. The outline of this test is described below.
【００２９】（イ） 試験法 パンチングメタルからなる芯体表面上の水素吸蔵合金層
を貫通して、芯体表面に達するまでの傷を、鋭利な刃で
切り付け水素吸蔵合金層の剥離の大小によって、電極の
機械的強度を評価する。(A) Test method A scratch which penetrates the hydrogen storage alloy layer on the surface of the core made of punched metal and reaches the surface of the core is cut with a sharp blade to determine the degree of peeling of the hydrogen storage alloy layer. Then, the mechanical strength of the electrode is evaluated.
【００３０】（ロ） 操作 水素吸蔵電極ａのほぼ中央に、直交する縦横１１本ずつ
の平行線を１ｍｍの間隔で引いて１ｃｍ2の中に１００
個の升目ができるように基盤目状の切り傷をつける。切
り傷をつけるにはカッターガイドなどを用いてカッター
ナイフの刃先を水素吸蔵合金電極ａに対して３５〜４５
度の範囲の一定角度に保ち、切り傷１本について約０．
５秒／ｃｍの等速度で引く。(B) Operation At approximately the center of the hydrogen-absorbing electrode a, 11 perpendicular and horizontal lines each having a length of 11 were drawn at an interval of 1 mm to form 100 lines in 1 cm 2.
Make a base-shaped cut to make individual squares. To make a cut, use a cutter guide or the like to move the blade edge of the cutter knife 35-45 with respect to the hydrogen storage alloy electrode a.
Keep at a constant angle in the range of degrees, and about 0.1 mm per cut.
Pull at a constant speed of 5 seconds / cm.
【００３１】（ハ） 機械的強度の評価 基盤目１００個のうち、芯体より水素吸蔵合金層が脱落
した個数で表示する。(C) Evaluation of mechanical strength The number of the hydrogen-absorbing alloy layers dropped from the core out of 100 bases is indicated.
【００３２】上記の試験を他の水素吸蔵電極ｂ，ｃ，ｖ
〜ｚについても同様に行った。The above test was carried out using the other hydrogen storage electrodes b, c, v
-Z were performed similarly.
【００３３】図１より明らかなように、ＰＴＦＥの平均
分子量が１０万未満になると、水素吸蔵合金層の極板か
らの脱落が著しいことが分かる。但し、ＦＥＰについて
は、平均分子量が１００万であっても、繊維化が起こら
ないため、水素吸蔵合金層の極板からの脱落が著しい。As is apparent from FIG. 1, when the average molecular weight of the PTFE is less than 100,000, the hydrogen storage alloy layer is remarkably dropped from the electrode plate. However, as for FEP, even if the average molecular weight is 1,000,000, fibrillation does not occur, so that the hydrogen storage alloy layer is remarkably dropped from the electrode plate.
【００３４】更に、前記水素吸蔵電極ａ〜ｃ、ｖ〜ｚに
ついて、水素吸蔵合金粉末の充填密度を測定した結果を
図２に示す。FIG. 2 shows the results of measuring the packing density of the hydrogen storage alloy powder for the hydrogen storage electrodes a to c and v to z.
【００３５】図２より明らかなように、ＰＴＦＥの平均
分子量が３００万を越えると、水素吸蔵合金粉末の充填
密度が著しく低下していることがわかる。As is apparent from FIG. 2, when the average molecular weight of PTFE exceeds 3,000,000, the packing density of the hydrogen storage alloy powder is significantly reduced.
【００３６】これは、ＰＴＦＥの平均分子量が大きいと
繊維化しやすいために、活物質スラリーの混練途中にＰ
ＴＦＥの繊維化が起こり、活物質スラリーの流動性が低
下するためである。This is because if the average molecular weight of PTFE is large, it is easy to fibrillate.
This is because TFE becomes fibrous and the fluidity of the active material slurry decreases.
【００３７】以上のことから、水素吸蔵電極ａ〜ｃは、
比較電極ｖ〜ｚに比べて、水素吸蔵合金粉末の充填密度
が高く、かつ機械的強度も優れていることがわかる。From the above, the hydrogen storage electrodes a to c are:
It can be seen that the packing density of the hydrogen storage alloy powder is higher and the mechanical strength is better than those of the comparative electrodes v to z.
【００３８】次に、水素吸蔵電極ａ〜ｃ及び比較電極ｖ
〜ｚを、夫々公知のニッケル電極と組み合わせ、３０重
量％の水酸化カリウム水溶液を電解液として用いて、公
称容量１０００ｍＡｈの密閉型ニッケル−水素蓄電池を
作製した。こうして作製した電池を、使用した水素吸蔵
電極の符号に対応させ、夫々本発明電池Ａ〜Ｃ、比較電
池Ｖ〜Ｚとする。Next, the hydrogen storage electrodes a to c and the comparison electrode v
To z were each combined with a known nickel electrode, and a sealed nickel-hydrogen storage battery having a nominal capacity of 1000 mAh was produced using a 30% by weight aqueous solution of potassium hydroxide as an electrolytic solution. The batteries fabricated in this manner are referred to as batteries A to C of the present invention and comparative batteries V to Z, respectively, corresponding to the reference numerals of the hydrogen storage electrodes used.
【００３９】前記本発明電池Ａ〜Ｃ、比較電池Ｖ〜Ｚを
１０００ｍＡで２００％まで充電したときの、電池内圧
測定結果を図３に示す。FIG. 3 shows the measurement results of the battery internal pressures when the batteries A to C of the present invention and the comparative batteries V to Z were charged up to 200% at 1000 mA.
【００４０】この図より、平均分子量が３００万を越え
ると電池内圧の上昇が著しいことがわかる。これは、Ｐ
ＴＦＥの分子量が大きいと、粒子の凝集が起こりやす
く、大きな粒子を形成し、それが圧延等で押し潰されて
合金表面を膜状に覆ってしまうため、酸素ガス消費が阻
害されるためである。From this figure, it is understood that when the average molecular weight exceeds 3,000,000, the internal pressure of the battery rises remarkably. This is P
If the molecular weight of TFE is large, agglomeration of particles is likely to occur, and large particles are formed, which are crushed by rolling or the like and cover the alloy surface in a film-like manner, thereby inhibiting oxygen gas consumption. .
【００４１】また、各電池Ａ〜Ｃ、Ｖ〜Ｚを１０００ｍ
Ａで満充電し、１時間の休止の後１０００ｍＡで電池電
圧が１．０Ｖになるまで放電するサイクルを繰り返し、
初期放電容量に対する各サイクルにおける放電容量の変
化を調べ、その結果を図４に示す。Each of the batteries A to C and V to Z is 1000 m
A cycle of fully charging at A, discharging after one hour of rest at 1000 mA until the battery voltage reaches 1.0 V,
Changes in the discharge capacity in each cycle with respect to the initial discharge capacity were examined, and the results are shown in FIG.
【００４２】図４より、水素吸蔵電極ａ〜ｃを備えた本
発明電池Ａ〜Ｃは、充放電サイクルを１０００回繰り返
した後でも、初期容量の９０％以上の放電容量が得られ
ており、優れたサイクル寿命特性を有していることがわ
かる。FIG. 4 shows that the batteries A to C of the present invention provided with the hydrogen storage electrodes a to c had a discharge capacity of 90% or more of the initial capacity even after repeating the charge / discharge cycle 1000 times. It turns out that it has excellent cycle life characteristics.
【００４３】一方、比較電極ｖ、ｗ、ｚを夫々備えた比
較電池Ｖ、Ｗ、Ｚは、電極の機械的強度が低いためにサ
イクルの進行とともに合金が脱落するために、放電容量
が６００サイクル経過後著しく低下している。On the other hand, in the comparative batteries V, W, and Z each having the comparative electrodes v, w, and z, the discharge capacity was 600 cycles because the alloy dropped off as the cycle progressed because the mechanical strength of the electrodes was low. It has decreased significantly over time.
【００４４】また、比較電極ｘ、ｙを夫々備えた比較電
池Ｘ、Ｙは水素吸蔵合金表面上にＰＴＦＥが膜化してい
るため、酸素ガス消費が阻害され、電池内圧が高くなっ
ている。この結果、充電末期に水素ガス及び酸素ガスが
電池外へ放出される際に、電解液が漏れて、電解液が減
少するため放電容量が低下している。Further, in the comparative batteries X and Y provided with the comparative electrodes x and y, respectively, since the PTFE is formed on the surface of the hydrogen storage alloy, the consumption of oxygen gas is hindered and the internal pressure of the battery is increased. As a result, when the hydrogen gas and the oxygen gas are discharged out of the battery at the end of charging, the electrolyte leaks, and the electrolyte decreases, so that the discharge capacity decreases.
【００４５】[0045]
【発明の効果】本発明電池によれば、負極としての水素
吸蔵電極は機械的強度及び水素吸蔵合金粉末の充填密度
が高く、この電極を備えた電池は、電池内圧の上昇が抑
制されており、優れたサイクル寿命特性を有する。According to the battery of the present invention, the hydrogen storage electrode as the negative electrode has a high mechanical strength and a high packing density of the hydrogen storage alloy powder, and in the battery provided with this electrode, an increase in the internal pressure of the battery is suppressed. And has excellent cycle life characteristics.
【図１】ＰＴＦＥとＦＥＰの平均分子量と水素吸蔵合金
層の脱落個数の関係図である。FIG. 1 is a graph showing the relationship between the average molecular weight of PTFE and FEP and the number of dropped hydrogen storage alloy layers.
【図２】ＰＴＦＥとＦＥＰの平均分子量と水素吸蔵合金
の充填密度の関係図である。FIG. 2 is a graph showing the relationship between the average molecular weight of PTFE and FEP and the packing density of a hydrogen storage alloy.
【図３】ＰＴＦＥとＦＥＰの平均分子量と電池内圧の関
係図である。FIG. 3 is a graph showing the relationship between the average molecular weight of PTFE and FEP and the internal pressure of the battery.
【図４】本発明電池と比較電池のサイクル寿命特性の比
較図である。FIG. 4 is a comparison diagram of cycle life characteristics of the battery of the present invention and a comparative battery.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−220373（ＪＰ，Ａ) 特開 平３−74055（ＪＰ，Ａ) 特開 平２−288157（ＪＰ，Ａ) 特開 昭61−66366（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 4/24 - 4/30 H01M 4/62 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-220373 (JP, A) JP-A-3-74055 (JP, A) JP-A-2-288157 (JP, A) JP-A 61- 66366 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) H01M 4/24-4/30 H01M 4/62
Claims (1)
素化物蓄電池において、前記水素吸蔵電極は結着剤とし
て平均分子量が１０万以上３００万以下のポリテトラフ
ルオロエチレンを含有することを特徴とする金属水素化
物蓄電池。1. A metal hydride storage battery using a hydrogen storage electrode as a negative electrode, wherein the hydrogen storage electrode contains polytetrafluoroethylene having an average molecular weight of 100,000 to 3,000,000 as a binder. Hydride storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05206385A JP3138120B2 (en) | 1993-08-20 | 1993-08-20 | Metal hydride storage battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05206385A JP3138120B2 (en) | 1993-08-20 | 1993-08-20 | Metal hydride storage battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0765825A JPH0765825A (en) | 1995-03-10 |
| JP3138120B2 true JP3138120B2 (en) | 2001-02-26 |
Family
ID=16522473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05206385A Expired - Lifetime JP3138120B2 (en) | 1993-08-20 | 1993-08-20 | Metal hydride storage battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3138120B2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009076430A (en) * | 2007-08-28 | 2009-04-09 | Sanyo Electric Co Ltd | Negative electrode for alkaline storage battery, and alkaline storage battery |
| US8187752B2 (en) | 2008-04-16 | 2012-05-29 | Envia Systems, Inc. | High energy lithium ion secondary batteries |
| WO2009131700A2 (en) | 2008-04-25 | 2009-10-29 | Envia Systems, Inc. | High energy lithium ion batteries with particular negative electrode compositions |
| US10056644B2 (en) | 2009-07-24 | 2018-08-21 | Zenlabs Energy, Inc. | Lithium ion batteries with long cycling performance |
| US9166222B2 (en) | 2010-11-02 | 2015-10-20 | Envia Systems, Inc. | Lithium ion batteries with supplemental lithium |
| US9780358B2 (en) | 2012-05-04 | 2017-10-03 | Zenlabs Energy, Inc. | Battery designs with high capacity anode materials and cathode materials |
| US10553871B2 (en) | 2012-05-04 | 2020-02-04 | Zenlabs Energy, Inc. | Battery cell engineering and design to reach high energy |
| US10020491B2 (en) | 2013-04-16 | 2018-07-10 | Zenlabs Energy, Inc. | Silicon-based active materials for lithium ion batteries and synthesis with solution processing |
| US10886526B2 (en) | 2013-06-13 | 2021-01-05 | Zenlabs Energy, Inc. | Silicon-silicon oxide-carbon composites for lithium battery electrodes and methods for forming the composites |
| US11476494B2 (en) | 2013-08-16 | 2022-10-18 | Zenlabs Energy, Inc. | Lithium ion batteries with high capacity anode active material and good cycling for consumer electronics |
| US11094925B2 (en) | 2017-12-22 | 2021-08-17 | Zenlabs Energy, Inc. | Electrodes with silicon oxide active materials for lithium ion cells achieving high capacity, high energy density and long cycle life performance |
-
1993
- 1993-08-20 JP JP05206385A patent/JP3138120B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0765825A (en) | 1995-03-10 |
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