JP3369592B2 - Battery - Google Patents
BatteryInfo
- Publication number
- JP3369592B2 JP3369592B2 JP11693192A JP11693192A JP3369592B2 JP 3369592 B2 JP3369592 B2 JP 3369592B2 JP 11693192 A JP11693192 A JP 11693192A JP 11693192 A JP11693192 A JP 11693192A JP 3369592 B2 JP3369592 B2 JP 3369592B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- current collector
- metal foil
- foil
- present
- 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
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
Landscapes
- Cell Electrode Carriers And Collectors (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は電池に係わり、特に集電
体としての金属箔の改良に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】従来、
円筒型電池などの正極及び負極の集電体として、電極の
巻き取りを可能にするために、可撓性を有する金属箔が
使用されている。たとえばリチウム二次電池の場合、正
極集電体としてアルミニウム箔が、また負極集電体とし
て銅箔が一般的に使用されている。
【０００３】しかしながら、かかる金属箔を集電体とす
る電池においては、活物質などは、金属箔に接着された
状態にあるわけではなく、図５にその断面図を示すよう
に、金属箔５１上に活物質層５２が単に圧接されている
に過ぎないものである。
【０００４】このため、たとえば電池組立時に電極を巻
き取り電池ケース内に収容する際に、また特に二次電池
にあっては充放電サイクルを重ねるうちに、活物質層が
集電体から離脱して、電池容量が低下してしまうという
問題があった。
【０００５】本発明は、かかる問題を解決するべくなさ
れたものであって、その目的とするところは、従来電池
に比し、放電特性やサイクル特性（二次電池の場合）に
優れた電池を提供するにある。
【０００６】
【課題を解決するための手段】上記目的を達成するため
の本発明に係る電池（以下、「本発明電池」と称す
る。）は、正極及び負極の少なくとも一方の電極の集電
体が、多数の貫通孔を有する電解めっきにより作製され
たアルミニウム箔又は銅箔（以下、アルミニウム箔及び
銅箔を金属箔と総称することがある）からなる。
【０００７】上記金属箔が有する貫通孔の形状は特に制
限されない。ただし、貫通孔の大きさについては、箔の
厚み及び強度によっても変わるが、引っ張り強度等の機
械的強度をもたせるために、通常最長辺（円孔にあって
は直径）が５０μｍを越えないことが好ましい。また、
金属箔の厚みについても特に制限されないが、通常３０
μｍを越えない程度の厚みのものが好適に使用される。
【０００８】上記多数の貫通孔を有する金属箔は、電解
めっきの一種である電鋳法により得られる。
【０００９】
【作用】本発明電池においては、少なくとも一方の電極
の集電体として多数の貫通孔を有する金属箔が使用さ
れ、この貫通孔を介して、集電体の両面に塗布形成され
た活物質層同士が一体化されるので、活物質層が集電体
から離脱しくい。
【００１０】
【実施例】以下、本発明を実施例に基づいてさらに詳細
に説明するが、本発明は下記実施例により何ら限定され
るものではなく、その要旨を変更しない範囲において適
宜変更して実施することが可能なものである。
【００１１】図１は電鋳法を利用して多数の貫通孔を有
するアルミニウム箔を作製する場合に使用する電鋳シス
テム１の模式的断面図であり、図示の電鋳システム１
は、めっき槽２、カソードドラム３（−極；陰極）、ア
ノード（＋極；陽極）４、巻き取りロール５などからな
る。
【００１２】めっき槽２内には溶融アルミニウム塩６
（めっき液）が収容されており、溶融アルミニウム塩６
中には、ステンレス製のカソードドラム３（陰極）の下
半部３１が浸漬されている。また、めっき槽２内には、
底部に開口部４１を有するアノード４（陽極）が、その
周面をカソードドラム３の下半部３１の周面に対向させ
た状態で配されている。
【００１３】カソードドラム３の周面は、部分的にレジ
スト７が塗布されてマスキングされており、金属箔（電
鋳箔）に孔部を形成し得るようになっている。なお、め
っき槽２内に示した矢符８は攪拌（攪拌機は図示せず）
による溶融アルミニウム塩６の対流の向きを示す。
【００１４】以上の如く構成された電鋳システム１にお
いて、直流電圧（図示せず）を印加して通電するととも
に、カソードドラム３を矢符９の方向に回転させると、
アルミニウム溶融塩６中に含まれるアルミニウムが、カ
ソードドラム３上のレジスト７でマスキングされた部分
以外の周面に電着する。
【００１５】なお、貫通孔を有する表面の平坦な金属箔
を作製するためには、電流密度や、めっき時間すなわち
カソードドラム３の回転速度などを調節して、電着膜の
厚みが塗布したレジスト７の厚みを上回らないようにす
ることが好ましい。
【００１６】本発明電池は、放電特性、サイクル特性な
どを向上させるために、従来の貫通孔のあいていない金
属箔における活物質層の離脱のし易さを、多数の貫通孔
を有する金属箔を集電体として使用することにより解消
した点に特徴を有する。それゆえ、正負両極の活物質、
電解質、セパレータ（液体電解質を使用する場合）の種
類などについては、電池の種類に応じて、従来使用さ
れ、或いは提案されている種々の材料を制限なく使用す
ることが可能である。
【００１７】本発明は、以上説明したとおりであるが、
より良き理解の一助とすべく、扁平型電池などにおいて
は、集電体としてパンチング（打ち抜き加工）などによ
り作製された貫通孔を有する集電体が実用されていたに
もかかわらず、円筒型電池などにおいては、集電体とし
て貫通孔を有する金属箔が使用されていなかった理由に
ついて述べておく。
【００１８】扁平型電池などにおける集電体としては、
パンチング板、ラス板、網目状板などが実用されている
が、これらはいずれも硬質であり非可撓性のものであ
る。これに対して、本発明における集電体は箔であり、
打ち抜き加工等の方法では製造困難なものである。以上
が、貫通孔を有する金属箔が従来検討されていなかった
第一の理由である。
【００１９】また、パンチング板、ラス板、網目板など
の表面は、バリや重畳部が存在するため平坦性に欠け
る。このため、集電体上の活物質層の厚みが不均一とな
り、その結果電池特性が悪くなる傾向がある。この電極
反応の不均一化は、扁平型電池などにおいては、ある程
度厚みのある集電体が使用され、しかも両電極が互いに
かなり離隔して配置されるので、さほど問題とならな
い。
【００２０】しかしながら、円筒型電池などにおいて
は、電極を渦巻き状に巻き取って所定の内容積の電池ケ
ース内に収容する必要があるため、厚みの薄い集電体
（箔）が使用される。しかも、電池容量を大きくするた
め両電極はかなり接近して配置される（巻き取る）こと
となる。したがって、この種の電池においては、集電体
表面のバリなどの凹凸が、ただちに短絡の原因となった
り、電極反応の不均一化をもたらしたりし易い。これで
は、たとえ何らかの機械加工方法により貫通孔を有する
金属箔を作製し得たとしても、箔表面に凹凸が存在する
以上、実用化するには至らない。以上が、貫通孔を有す
る金属箔が集電体として従来検討されていなかった第二
の理由である。
【００２１】（実施例１）
〔正極の作製〕ＬｉＣｏＯ2 に、導電剤としてのアセチ
レンブラックと、結着剤としてのフッ素樹脂ディスパー
ジョンとを、重量比９０：６：４の比率で混合して正極
合剤を得た。また、電解めっき（電鋳法）を行い、正方
形（辺長：３０μｍ）の貫通孔を有する厚み１５μｍの
アルミニウム箔を作製し、このアルミニウム箔の両面に
上記正極合剤を塗布し、圧延し、２５０°Ｃで２時間真
空下で加熱処理して正極を作製した。
【００２２】図２は、このようにして作製した正極２１
の模式的断面図であり、同図に示すように、多数の貫通
孔２４，２４…を有する集電体２２（アルミニウム箔）
の両面に塗布形成された正極合剤層２３ａ，２３ｂは貫
通孔２４に進入した正極合剤層２３ｃにより一体化さ
れ、集電体２２から離脱しにくくなっている。
【００２３】〔負極の作製〕リチウム金属板を、集電体
としての銅箔（硫酸銅浴をめっき浴として上記と同様に
電鋳法により作製したもの）の両面に圧延し、２５０°
Ｃで２時間真空下で加熱処理して負極を作製した。
【００２４】〔電解液の調製〕エチレンカーボネートと
ジメチルカーボネートとの等体積混合溶媒に、ＬｉＰＦ
6 を１モル／リットル溶かして電解液を調製した。
【００２５】〔本発明電池ＢＡ１の作製〕以上の正負両
極及び電解液を用いて円筒型のリチウム二次電池ＢＡ１
を作製した（電池寸法：直径１４．２ｍｍ；長さ５０．
２ｍｍ）。なお、セパレータとしてイオン透過性のポリ
プロピレン製微孔性薄膜を用いた。
【００２６】図３は作製した電池ＢＡ１の断面図であ
り、同図に示す電池ＢＡ１は、正極３１及び負極３２、
これら両電極を離隔するセパレータ３３、正極リード３
４、負極リード３５、正極外部端子３６、負極缶３７な
どからなる。正極３１及び負極３２は電解液が注入され
たセパレータ３３を介して渦巻き状に巻き取られた状態
で負極缶３７内に収容されており、正極３１は正極リー
ド３４を介して正極外部端子３６に、また負極３２は負
極リード３５を介して負極缶３７に接続され、電池ＢＡ
１内部で生じた化学エネルギーを電気エネルギーとして
外部へ取り出し得るようになっている。
【００２７】（比較例１）正極及び負極の集電体とし
て、孔のあいていないアルミニム箔、銅箔をそれぞれ使
用したこと以外は実施例１と同様にして、円筒型の比較
電池ＢＣ１を作製した。
【００２８】（各電池のサイクル特性）本発明電池ＢＡ
１及び比較電池ＢＣ１について、充電電流２００ｍＡで
充電終止電圧４．１Ｖまで充電した後、放電電流２００
ｍＡで放電終止電圧３Ｖまで放電する工程を１サイクル
とするサイクル試験を行い、各電池のサイクル特性を調
べた。
【００２９】図４は、各電池のサイクル特性を、縦軸に
電池容量（ｍＡｈ）を、また横軸にサイクル数（回）を
とって示したグラフである。同図より、本発明電池ＢＡ
１は、サイクル数４００回においても初期の電池容量
（５００ｍＡｈ）を保持しているのに対して、比較電池
ＢＣ１では、サイクル初期から急激に電池容量が低下
し、サイクル数２５０回において２５０ｍＡｈ弱にまで
電池容量が減少してしまうことが分かる。
【００３０】叙上の実施例では本発明をリチウム二次電
池に適用する場合の具体例について説明したが、本発明
は電池の種類及び一次電池か二次電池かを問わず、金属
箔を集電体に使用する電池一般に適用し得るものであ
る。
【００３１】
【発明の効果】本発明電池においては、少なくとも一方
の電極の集電体として多数の貫通孔を有する金属箔が使
用されているので、活物質などが集電体から離脱しにく
く、このため放電特性やサイクル特性に優れるなど、本
発明は優れた特有の効果を奏する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery, and more particularly to an improvement in a metal foil as a current collector. 2. Description of the Related Art
BACKGROUND ART As a current collector for a positive electrode and a negative electrode of a cylindrical battery or the like, a flexible metal foil is used to enable winding of an electrode. For example, in the case of a lithium secondary battery, an aluminum foil is generally used as a positive electrode current collector, and a copper foil is generally used as a negative electrode current collector. However, in a battery using such a metal foil as a current collector, the active material and the like are not in a state of being adhered to the metal foil, and as shown in a sectional view of FIG. The active material layer 52 is merely pressed on the top. For this reason, for example, when the electrodes are taken up in a battery case at the time of assembling the battery, and particularly in a secondary battery, the charge / discharge cycle is repeated so that the active material layer is separated from the current collector. Thus, there is a problem that the battery capacity is reduced. The present invention has been made to solve such a problem, and an object of the present invention is to provide a battery having better discharge characteristics and cycle characteristics (in the case of a secondary battery) than conventional batteries. To offer. A battery according to the present invention for achieving the above object (hereinafter referred to as "battery of the present invention") is a current collector for at least one of a positive electrode and a negative electrode. but it is produced by electrolytic plating to have a large number of through-holes
Aluminum foil or copper foil (hereinafter referred to as aluminum foil and
Copper foil may be collectively referred to as metal foil) . [0007] The shape of the through hole of the metal foil is not particularly limited. However, the size of the through hole depends on the thickness and strength of the foil. However, in order to provide mechanical strength such as tensile strength, the longest side (diameter for a circular hole) should not exceed 50 μm. Is preferred. Also,
Although the thickness of the metal foil is not particularly limited, it is usually 30.
Thicknesses not exceeding μm are preferably used. [0008] Metal foil having the plurality of through-holes is more obtained which is one type electroforming of electrolytic plating. In the battery of the present invention, a metal foil having a large number of through holes is used as a current collector of at least one electrode, and the metal foil is formed on both surfaces of the current collector through the through holes. Since the active material layers are integrated with each other, it is difficult for the active material layer to separate from the current collector. Hereinafter, the present invention will be described in more detail with reference to Examples. However, the present invention is not limited to the following Examples, and may be appropriately modified within the scope of the present invention. It can be implemented. FIG. 1 is a schematic sectional view of an electroforming system 1 used for producing an aluminum foil having a large number of through holes by using an electroforming method.
Is composed of a plating tank 2, a cathode drum 3 (negative electrode; cathode), an anode (+ electrode; anode) 4, a winding roll 5, and the like. The molten aluminum salt 6 is contained in the plating tank 2.
(Plating solution) and contains molten aluminum salt 6
The lower half 31 of the cathode drum 3 (cathode) made of stainless steel is immersed therein. Also, in the plating tank 2,
An anode 4 (anode) having an opening 41 at the bottom is disposed with its peripheral surface facing the peripheral surface of the lower half 31 of the cathode drum 3. The peripheral surface of the cathode drum 3 is partially coated with a resist 7 and masked so that a hole can be formed in a metal foil (electroformed foil). The arrow 8 shown in the plating tank 2 is stirring (a stirrer is not shown).
Shows the direction of convection of the molten aluminum salt 6 by the following formula. In the electroforming system 1 configured as described above, when a DC voltage (not shown) is applied to energize and the cathode drum 3 is rotated in the direction of the arrow 9,
Aluminum contained in the aluminum molten salt 6 is electrodeposited on the peripheral surface of the cathode drum 3 other than the portion masked by the resist 7. In order to produce a metal foil having a flat surface having through holes, the thickness of the electrodeposited film is adjusted by adjusting the current density, the plating time, that is, the rotation speed of the cathode drum 3, and the like. It is preferable not to exceed the thickness of 7. In order to improve the discharge characteristics, cycle characteristics, and the like of the battery of the present invention, the ease of detachment of the active material layer in a conventional metal foil having no through-holes is improved by using a metal foil having a large number of through-holes. Is characterized by being eliminated by using as a current collector. Therefore, positive and negative active materials,
As for the type of electrolyte and separator (when a liquid electrolyte is used), conventionally used or proposed various materials can be used without limitation depending on the type of battery. The present invention is as described above.
In order to assist in better understanding, in the case of flat batteries and the like, although current collectors having through holes made by punching (punching) have been used as current collectors, cylindrical batteries have been used in practice. In the above, the reason why a metal foil having a through hole is not used as a current collector will be described. As a current collector in a flat battery or the like,
Punching plates, lath plates, mesh plates and the like have been put into practical use, but all of them are hard and non-flexible. In contrast, the current collector in the present invention is a foil,
It is difficult to manufacture by a method such as punching. The above is the first reason why a metal foil having a through hole has not been studied conventionally. Further, the surface of a punching plate, a lath plate, a mesh plate or the like lacks flatness due to the presence of burrs and overlapping portions. For this reason, the thickness of the active material layer on the current collector becomes uneven, and as a result, battery characteristics tend to deteriorate. The nonuniformity of the electrode reaction does not cause much problem in a flat battery or the like, because a current collector having a certain thickness is used, and the two electrodes are arranged at a considerable distance from each other. However, in a cylindrical battery or the like, a thin current collector (foil) is used because it is necessary to spirally wind the electrode and house it in a battery case having a predetermined internal volume. In addition, both electrodes are arranged (rolled up) very close to increase the battery capacity. Therefore, in this type of battery, irregularities such as burrs on the surface of the current collector easily cause a short circuit immediately or cause non-uniform electrode reactions. In this case, even if a metal foil having a through hole can be produced by any machining method, it cannot be put to practical use as long as the foil surface has irregularities. The above is the second reason why a metal foil having a through hole has not been conventionally studied as a current collector. (Example 1) [Preparation of positive electrode] LiCoO 2 was mixed with acetylene black as a conductive agent and a fluororesin dispersion as a binder in a weight ratio of 90: 6: 4. A positive electrode mixture was obtained. In addition, electrolytic plating (electroforming) is performed to produce a 15-μm-thick aluminum foil having a square (side length: 30 μm) through-hole, and the positive electrode mixture is applied to both surfaces of the aluminum foil and rolled. Heat treatment was performed at 250 ° C. for 2 hours under vacuum to produce a positive electrode. FIG. 2 shows the cathode 21 thus manufactured.
Is a schematic sectional view of the current collector 22 (aluminum foil) having a large number of through holes 24, 24,... As shown in FIG.
The positive electrode mixture layers 23a and 23b applied to both surfaces of the substrate are integrated by the positive electrode mixture layer 23c that has entered the through-hole 24, and are hardly separated from the current collector 22. [Preparation of Negative Electrode] A lithium metal plate was rolled on both sides of a copper foil as a current collector (prepared by using a copper sulfate bath as a plating bath and electroforming in the same manner as above), and then rolled at 250 °
C. for 2 hours under vacuum to produce a negative electrode. [Preparation of electrolytic solution] LiPF was added to an equal volume mixed solvent of ethylene carbonate and dimethyl carbonate.
6 was dissolved at 1 mol / liter to prepare an electrolytic solution. [Preparation of Battery BA1 of the Present Invention] A cylindrical lithium secondary battery BA1 was prepared using the above positive and negative electrodes and an electrolytic solution.
(Battery dimensions: diameter 14.2 mm; length 50.
2 mm). In addition, an ion-permeable polypropylene microporous thin film was used as a separator. FIG. 3 is a cross-sectional view of the manufactured battery BA1. The battery BA1 shown in FIG.
Separator 33 and positive electrode lead 3 separating these two electrodes
4, a negative electrode lead 35, a positive electrode external terminal 36, a negative electrode can 37 and the like. The positive electrode 31 and the negative electrode 32 are housed in a negative electrode can 37 in a state of being spirally wound through a separator 33 into which an electrolytic solution has been injected. The negative electrode 32 is connected to a negative electrode can 37 via a negative electrode lead 35, and the battery BA
1 can take out chemical energy generated inside as electric energy to the outside. Comparative Example 1 A cylindrical comparative battery BC1 was produced in the same manner as in Example 1 except that non-perforated aluminum foil and copper foil were used as current collectors for the positive electrode and the negative electrode, respectively. did. (Cycle characteristics of each battery) Battery BA of the present invention
1 and the comparative battery BC1 at a charging current of 200 mA up to a charging end voltage of 4.1 V, and then a discharging current of 200 mA.
A cycle test was performed in which the process of discharging to a discharge end voltage of 3 V at 1 mA was one cycle, and the cycle characteristics of each battery were examined. FIG. 4 is a graph showing the cycle characteristics of each battery, the battery capacity (mAh) on the vertical axis, and the number of cycles (times) on the horizontal axis. As shown in FIG.
No. 1 retains the initial battery capacity (500 mAh) even at 400 cycles, whereas the battery capacity of the comparative battery BC1 sharply decreases from the beginning of the cycle, and decreases to slightly less than 250 mAh at 250 cycles. It can be seen that the battery capacity is reduced to this point. In the above embodiment, a specific example in which the present invention is applied to a lithium secondary battery has been described. However, the present invention collects metal foil regardless of the type of battery and whether it is a primary battery or a secondary battery. The present invention can be generally applied to batteries used for electric conductors. According to the battery of the present invention, since a metal foil having a large number of through holes is used as a current collector for at least one of the electrodes, the active material and the like are hardly detached from the current collector. For this reason, the present invention has excellent unique effects such as excellent discharge characteristics and cycle characteristics.
【図面の簡単な説明】
【図１】本発明電池に使用される集電体を作製する際に
用いる電鋳システムの断面図である。
【図２】実施例で作製した電極の断面図である。
【図３】円筒型の本発明電池ＢＡ１の断面図である。
【図４】サイクル特性図である。
【図５】従来電池の電極の断面図である。
【符号の説明】
２１ 正極
２２ 集電体
２４ 貫通孔BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an electroforming system used when producing a current collector used in a battery of the present invention. FIG. 2 is a cross-sectional view of an electrode manufactured in an example. FIG. 3 is a sectional view of a cylindrical battery BA1 of the present invention. FIG. 4 is a cycle characteristic diagram. FIG. 5 is a sectional view of an electrode of a conventional battery. [Description of Signs] 21 Positive electrode 22 Current collector 24 Through hole
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西尾 晃治 大阪府守口市京阪本通２丁目18番地 三 洋電機株式会社内 (56)参考文献 特開 平４−22069（ＪＰ，Ａ) 特開 平４−147567（ＪＰ，Ａ) 特開 平５−23760（ＪＰ，Ａ) 実開 昭62−120257（ＪＰ，Ｕ) 実開 平２−42366（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 4/66 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koji Nishio 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-4-22069 (JP, A) JP-A-Hei 4-147567 (JP, A) JP-A-5-23760 (JP, A) JP-A 62-120257 (JP, U) JP-A 2-42366 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H01M 4/66
Claims (1)
貫通孔を有する電解めっきにより作製されたアルミニウ
ム箔又は銅箔からなることを特徴とする電池。(57) [Claims] [Claim 1] of at least one electrode current collector, made by electroplating to have a large number of through-holes aluminum
A battery comprising a metal foil or a copper foil .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11693192A JP3369592B2 (en) | 1992-04-09 | 1992-04-09 | Battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11693192A JP3369592B2 (en) | 1992-04-09 | 1992-04-09 | Battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05290853A JPH05290853A (en) | 1993-11-05 |
| JP3369592B2 true JP3369592B2 (en) | 2003-01-20 |
Family
ID=14699243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11693192A Expired - Lifetime JP3369592B2 (en) | 1992-04-09 | 1992-04-09 | Battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3369592B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000243450A (en) * | 1999-02-19 | 2000-09-08 | Fujitsu Ltd | Alkaline secondary battery |
| JP3838878B2 (en) | 2000-04-28 | 2006-10-25 | 松下電器産業株式会社 | Battery electrode plate and manufacturing method thereof |
| JP4875808B2 (en) * | 2001-08-07 | 2012-02-15 | パナソニック株式会社 | Multilayer secondary battery |
| US9548497B2 (en) | 2011-06-10 | 2017-01-17 | Eaglepicher Technologies, Llc | Layered composite current collector with plurality of openings, methods of manufacture thereof, and articles including the same |
-
1992
- 1992-04-09 JP JP11693192A patent/JP3369592B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05290853A (en) | 1993-11-05 |
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