JP3332335B2 - Method for manufacturing current collector for secondary battery - Google Patents
Method for manufacturing current collector for secondary batteryInfo
- Publication number
- JP3332335B2 JP3332335B2 JP25753197A JP25753197A JP3332335B2 JP 3332335 B2 JP3332335 B2 JP 3332335B2 JP 25753197 A JP25753197 A JP 25753197A JP 25753197 A JP25753197 A JP 25753197A JP 3332335 B2 JP3332335 B2 JP 3332335B2
- Authority
- JP
- Japan
- Prior art keywords
- current collector
- secondary battery
- copper
- rolled
- tensile strength
- 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)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、二次電池、特にリ
チウム系二次電池を作成する際に用いる集電体の製造方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a current collector used for producing a secondary battery, particularly a lithium secondary battery.
It is about the law .
【０００２】[0002]
【従来の技術】二次電池は、基本的には、正極，負極，
正極と負極とを絶縁するセパレーター，及び正極と負極
との間でイオンの移動を可能にするための電解液で構成
されている。二次電池の負極は、金属箔からなる集電体
の表面に、各種の活物質が塗布されてなる。この金属箔
としては、電気伝導率及びイオン化傾向の観点より、純
銅系材料、例えばタフピッチ銅等を用いて得られる銅圧
延箔（厚さ数μｍ〜数十μｍ程度）が、一般的に採用さ
れている。また、活物質としては、カーボン又はグラフ
ァイトと、ポリビニリデンフルオライド（ＰＶＤＦ）等
のバインダーとを混合したペースト状物が用いられてい
る。2. Description of the Related Art A secondary battery is basically composed of a positive electrode, a negative electrode,
It is composed of a separator that insulates the positive electrode and the negative electrode, and an electrolytic solution that enables ions to move between the positive electrode and the negative electrode. The negative electrode of the secondary battery is formed by applying various active materials to the surface of a current collector made of a metal foil. As the metal foil, a rolled copper foil (thickness of about several μm to several tens of μm) obtained by using a pure copper-based material, for example, tough pitch copper, is generally adopted from the viewpoint of electrical conductivity and ionization tendency. ing. Further, as the active material, a paste-like material obtained by mixing carbon or graphite and a binder such as polyvinylidene fluoride (PVDF) is used.
【０００３】このような二次電池の負極は、一般的に、
集電体表面に活物質を塗布した後、高密度に巻き取ら
れ、二次電池に組み込まれるのである。高密度の巻き取
りを可能とするためには、集電体に高張力を与えなけれ
ばならない。従って、集電体としては、高張力を負荷し
た際にも、破断しにくいもの、即ち引張強さの高いもの
を採用しなければならない。また、集電体を二次電池に
組み込んだ後においても、二次電池の充放電に伴い、集
電体表面に塗布された活物質が膨張及び収縮する。そし
て、この膨張及び収縮により、負極に歪が発生するた
め、集電体としては、この歪によって破断しにくいもの
を採用しなければならない。二次電池の集電体として
は、以上のような機械的特性（特に高引張強さ）が要求
されることから、タフピッチ銅圧延箔のうちでも、最も
硬く且つ引張強さの高い、質別Ｈが選ばれるのが、一般
的である。The negative electrode of such a secondary battery is generally
After the active material is applied to the surface of the current collector, the active material is wound up at a high density and incorporated into a secondary battery. In order to enable high-density winding, a high tension must be applied to the current collector. Therefore, it is necessary to use a current collector that does not easily break even when a high tension is applied, that is, a current collector that has a high tensile strength. Further, even after the current collector is incorporated in the secondary battery, the active material applied to the current collector surface expands and contracts as the secondary battery is charged and discharged. Since the expansion and contraction cause distortion in the negative electrode, a current collector that is difficult to break due to the distortion must be used. Since the above-mentioned mechanical properties (especially high tensile strength) are required for the current collector of the secondary battery, among the tough pitch copper rolled foils, the hardest and highest tensile strength temper It is common that H is chosen.
【０００４】しかしながら、タフピッチ銅圧延箔（質別
Ｈ）は、製造直後は高引張強さを持っているものの、製
造後、長期間保管しておくと、この引張強さが経時的に
低下してゆくということがあった。従って、タフピッチ
銅圧延箔を、長期間保管しておいた後に、集電体として
使用すると、活物質を塗布して巻き取る際に、破断する
という欠点があった。また、破断しないようにして集電
体の巻き取りを行なうためには、保管期間の異なるタフ
ピッチ銅圧延箔毎に、引張強さを測定し、巻き取り張力
の調整をしなければならないという欠点があった。従っ
て、タフピッチ銅圧延箔（質別Ｈ）を集電体として用い
ると、二次電池の製造が合理的に行なえないという憾み
があった。[0004] However, although the tough pitch copper rolled foil (Temperature H) has a high tensile strength immediately after production, if it is stored for a long time after production, this tensile strength decreases with time. There was something going on. Therefore, if the tough pitch copper rolled foil is used as a current collector after being stored for a long period of time, it has a disadvantage that the active material is broken when it is applied and wound. In addition, in order to wind the current collector without breaking, the drawback is that the tensile strength must be measured and the winding tension adjusted for each tough pitch copper rolled foil having a different storage period. there were. Therefore, there was a regret that if a tough pitch copper rolled foil (quality H) was used as a current collector, the production of a secondary battery could not be carried out rationally.
【０００５】更に、このタフピッチ銅圧延箔（質別Ｈ）
を集電体として組み込んだ二次電池は、集電体の引張強
さが経時的に低下してゆくため、二次電池の充放電に伴
う活物質の膨張及び収縮によって、二次電池中の集電体
が破断するという恐れがあった。従って、二次電池を長
期間使用しているうちに、集電体が破断し、充電容量や
放電容量が、極端に低下するということがあり、二次電
池の寿命を長くすることができないという欠点があっ
た。Further, this tough pitch copper rolled foil (quality H)
In a secondary battery incorporating the as a current collector, the tensile strength of the current collector decreases with time, so the expansion and contraction of the active material accompanying charging and discharging of the secondary battery causes There was a fear that the current collector would break. Therefore, while the secondary battery is used for a long period of time, the current collector is broken, the charge capacity and the discharge capacity may be extremely reduced, and the life of the secondary battery cannot be extended. There were drawbacks.
【０００６】[0006]
【発明が解決しようとする課題】本発明者等は、タフピ
ッチ銅圧延箔（質別Ｈ）の引張強さが、経時的に低下し
てゆく理由は、その製造方法にあると考えている。即
ち、タフピッチ銅圧延箔（質別Ｈ）が、比較的、高圧延
率で冷間加工して製造されているからであると考えてい
る。これを具体的に説明すると、以下のとおりになる。
銅等の金属材料は、冷間加工を受けると、塑性変形を生
じ、その過程で転位や原子空孔等の多数の格子欠陥を生
成する。冷間加工後に所定の温度以上に加熱すると、格
子欠陥のある場所で原子の再配列が起こり（これを核生
成と称する。）、回復及び再結晶が始まり、軟化し、引
張強さが低下する。また、冷間加工における圧延率が高
いものほど、回復，再結晶の駆動力となる内部エネルギ
ー（格子欠陥に起因する）が大きくなり、これらの現象
が起こり易くなる。従って、二次電池用の集電体の如
く、その厚さがミクロンオーダーとなるまで高圧延率で
冷間加工を受けると、格子欠陥に起因する内部エネルギ
ーが非常に大きくなるために、回復及び再結晶が促進さ
れて、結果的に室温程度で回復及び再結晶が進行する。
従って、このようなタフピッチ銅圧延箔（質別Ｈ）を、
長期間、室温で保管しておくと、経時的に再結晶が進行
し、軟化して、引張強さが経時的に低下してゆくのであ
る。The present inventors believe that the reason why the tensile strength of the tough pitch rolled copper foil (temper H) decreases with time is due to the manufacturing method thereof. That is, it is considered that the tough pitch copper rolled foil (quality H) is manufactured by cold working at a relatively high rolling rate. This will be specifically described as follows.
A metal material such as copper undergoes plastic deformation when subjected to cold working, and generates many lattice defects such as dislocations and atomic vacancies in the process. When heated above a predetermined temperature after cold working, the rearrangement of atoms occurs at the location of lattice defects (this is called nucleation), recovery and recrystallization start, softening, and the tensile strength decreases. . In addition, the higher the rolling reduction in cold working, the greater the internal energy (due to lattice defects) which is the driving force for recovery and recrystallization, and these phenomena are more likely to occur. Therefore, when subjected to cold working at a high rolling reduction until the thickness thereof becomes on the order of microns, such as a current collector for a secondary battery, the internal energy due to lattice defects becomes very large, so that the recovery and Recrystallization is promoted, and as a result, recovery and recrystallization proceed at about room temperature.
Therefore, such a tough pitch copper rolled foil (quality H)
When stored at room temperature for a long time, recrystallization progresses with time, softens, and the tensile strength decreases with time.
【０００７】また、二次電池における充放電は、電池内
での化学反応に基づくものであるが、この化学反応によ
って発熱が起こり、充放電時には６０〜８０℃程度とな
っている。従って、充放電時においては、集電体である
タフピッチ銅圧延箔（質別Ｈ）の回復及び再結晶が促進
され、タフピッチ銅圧延箔（質別Ｈ）は軟化し、引張強
さが低下する。[0007] The charging and discharging of the secondary battery is based on a chemical reaction in the battery. The chemical reaction generates heat, and the temperature is about 60 to 80 ° C during charging and discharging. Therefore, at the time of charging and discharging, recovery and recrystallization of the tough pitch copper rolled foil (temper H), which is a current collector, are promoted, and the tough pitch copper rolled foil (temper H) is softened and the tensile strength decreases. .
【０００８】更に、引張強さの低下とは直接関係はない
が、タフピッチ銅圧延箔（質別Ｈ）が回復及び再結晶し
やすいことに伴うこととして、以下のような弊害もあ
る。即ち、二次電池中における集電体であるタフピッチ
銅圧延箔（質別Ｈ）の回復及び再結晶が進行すると、集
電体の電気特性も変化するという弊害がある。再結晶が
進行すると、タフピッチ銅圧延箔（質別Ｈ）の電気伝導
率が上昇し、電気抵抗が低下する。従って、製造直後の
二次電池の電気特性が、使用に伴い変化しやすくなり、
二次電池の初期特性が維持しにくくなる。依って、二次
電池に対する信頼性を損なうという弊害がある。[0008] Further, although there is no direct relationship with the decrease in tensile strength, the following disadvantages are associated with the fact that the tough pitch rolled copper foil (temper H) tends to recover and recrystallize. That is, as the recovery and recrystallization of the tough pitch copper rolled foil (temper H) as the current collector in the secondary battery progresses, the electric characteristics of the current collector also change. As the recrystallization proceeds, the electrical conductivity of the tough pitch copper rolled foil (temper H) increases, and the electrical resistance decreases. Therefore, the electrical characteristics of the secondary battery immediately after manufacturing is likely to change with use,
It becomes difficult to maintain the initial characteristics of the secondary battery. Therefore, there is a disadvantage that reliability of the secondary battery is impaired.
【０００９】このため、本発明者等は、タフピッチ銅圧
延箔（質別Ｈ）の製造方法を変更し、引張強さが経時的
に低下しにくい銅箔を得ることを考えた。しかしなが
ら、集電体として使用する厚さ数μｍ〜数十μｍ程度の
銅箔であって、ある程度の引張強さを持つ銅箔を得るに
は、従来の製造方法が合理的である。そこで、製造方法
よりも、銅箔の元素組成について検討を行なったとこ
ろ、銅中に含有させる酸素量を制限することにより、回
復及び再結晶が抑制でき、それによって、室温で長期間
放置しておいても、引張強さが経時的に低下しにくくく
なるという知見が得られた。本発明は、このような知見
に基づいてなされたものである。For this reason, the present inventors considered changing the method of manufacturing the tough pitch rolled copper foil (temper H) to obtain a copper foil whose tensile strength is unlikely to decrease with time. However, in order to obtain a copper foil having a thickness of about several μm to several tens μm used as a current collector and having a certain tensile strength, a conventional manufacturing method is rational. Therefore, rather than the manufacturing method, when examining the elemental composition of the copper foil, by limiting the amount of oxygen contained in the copper, recovery and recrystallization can be suppressed, thereby leaving it at room temperature for a long time. Also, it was found that the tensile strength hardly decreases with time. The present invention has been made based on such findings.
【００１０】[0010]
【課題を解決するための手段】即ち、本発明は、銅が９
９．９５重量％以上で、且つ酸素の含有量が０．００２
重量％以下である銅鋳塊に、熱間圧延、一次冷間圧延、
中間焼鈍及び二次冷間圧延を施して銅圧延箔を得ること
を特徴とする、銅圧延箔よりなる二次電池用集電体の製
造方法に関するものである。That is, according to the present invention, copper has a capacity of 9%.
9.95% by weight or more and the oxygen content is 0.002
Hot rolling, primary cold rolling,
Intermediate annealing and secondary cold rolling to obtain copper rolled foil
Of a current collector for a secondary battery made of rolled copper foil
It relates to a manufacturing method .
【００１１】本発明に係る二次電池用集電体は、銅圧延
箔よりなる。この銅圧延箔は、銅（Ｃｕ）が９９．９５
重量％以上で、且つ酸素（Ｏ）が０．００２重量％以下
である銅鋳塊に、熱間圧延、一次冷間圧延、中間焼鈍及
び二次冷間圧延を施して得られるものである。銅鋳塊
は、より好ましくは、銅が９９．９９重量％以上で、酸
素が０．００１重量％以下である。銅鋳塊中において、
銅が９９．９５重量％未満であると、得られる銅圧延箔
の電気伝導度が低下し、集電体として用いるには不適当
となる。また、酸素が０．００２重量％を超えると、以
下の理由で好ましくない。即ち、得られる銅圧延箔中の
金属組織内に、比較的多数のＣｕ2Ｏ粒子が第二相粒子
として分布し、この粒子の界面が近傍の格子欠陥を吸収
し、回復及び再結晶の場を増大させる。その結果、銅圧
延箔の回復及び再結晶を十分に抑制できず、室温で長期
間放置しておくと、銅圧延箔の引張強さが経時的に低下
する。また、比較的多数のＣｕ2Ｏ粒子の存在により、
銅圧延箔自体の電気伝導度も低下するので、好ましくな
い。なお、この銅圧延箔には、銅と酸素の他に、その不
可避不純物が含まれていても良いことは、言うまでもな
い。The current collector for a secondary battery according to the present invention comprises a rolled copper foil. This rolled copper foil contains 99.95 copper (Cu).
Hot rolling, primary cold rolling, intermediate annealing , etc. to a copper ingot having a weight percentage of not less than 0.002% by weight
And secondary cold rolling. Copper ingot
Is more preferably of copper of 99.99% by weight or more, the oxygen is 0.001% or less. In the copper ingot,
If the copper content is less than 99.95% by weight, the electrical conductivity of the obtained rolled copper foil decreases, and the copper foil becomes unsuitable for use as a current collector. Further, if the oxygen content exceeds 0.002% by weight, it is not preferable for the following reasons. That is, a relatively large number of Cu 2 O particles are distributed as second-phase particles in the metal structure in the obtained rolled copper foil, and the interface between the particles absorbs nearby lattice defects, thereby causing a recovery and recrystallization. Increase. As a result, the recovery and recrystallization of the rolled copper foil cannot be sufficiently suppressed, and when left at room temperature for a long time, the tensile strength of the rolled copper foil decreases with time. Also, due to the presence of a relatively large number of Cu 2 O particles,
The electric conductivity of the rolled copper foil itself also decreases, which is not preferable. It goes without saying that the copper rolled foil may contain unavoidable impurities in addition to copper and oxygen.
【００１２】本発明に係る二次電池用集電体の厚さは、
厚さ８〜３０μｍ程度、好ましくは１０〜２０μｍ程度
の銅圧延箔よりなる。このような所望厚さの銅圧延箔
は、銅及び酸素を所定量含有する銅鋳塊を準備し、これ
に熱間圧延，一次冷間圧延，中間焼鈍，二次冷間圧延を
施すことにより、得ることができる。The thickness of the current collector for a secondary battery according to the present invention is:
It is made of a rolled copper foil having a thickness of about 8 to 30 μm, preferably about 10 to 20 μm. Copper foil with desired thickness
It is copper and oxygen to prepare a copper ingot containing a predetermined amount, this hot rolling, the primary cold rolling, intermediate annealing, by performing secondary cold rolling, can be obtained.
【００１３】このような銅圧延箔は、各種二次電池用の
集電体として好適に用いられる。即ち、銅圧延箔に、活
物質を塗布して、二次電池の極板が得られるのである。
具体的には、例えば、カーボン又はグラファイトよりな
る活物質と、ポリビニリデンフルオライド（ＰＶＤＦ）
等のバインダーとを混合したペースト状物を、銅圧延箔
よりなる集電体に塗布し、リチウムイオン電池，金属リ
チウム電池，ポリマー電池等のリチウム系二次電池の負
極が得られるのである。Such a rolled copper foil is suitably used as a current collector for various secondary batteries. That is, the active material is applied to the rolled copper foil to obtain the electrode plate of the secondary battery.
Specifically, for example, an active material made of carbon or graphite and polyvinylidene fluoride (PVDF)
A paste-like material mixed with a binder such as the above is applied to a current collector made of a rolled copper foil to obtain a negative electrode of a lithium-based secondary battery such as a lithium ion battery, a metal lithium battery, and a polymer battery.
【００１４】[0014]
【実施例】以下、実施例によって本発明を説明するが、
本発明は実施例に限定されるものではない。本発明は、
酸素の含有量が０．００２重量％以下である銅鋳塊に、
熱間圧延、一次冷間圧延、中間焼鈍及び二次冷間圧延を
施して得られた銅圧延箔は、経時的に引張強さが低下し
にくいという特性の発見に基づくものであるとして認識
されるべきである。Hereinafter, the present invention will be described with reference to Examples.
The present invention is not limited to the embodiments. The present invention
In a copper ingot having an oxygen content of 0.002% by weight or less ,
Hot rolling, primary cold rolling, intermediate annealing and secondary cold rolling
It should be recognized that the resulting rolled copper foil is based on the discovery of the property that the tensile strength is unlikely to decrease over time.
【００１５】実施例１〜３及び比較例１ 純度９９．９９重量％の電気銅地金に、酸素を表１に示
した含有量となるように添加し、溶融及び鋳造して、厚
さ２００ｍｍの銅鋳塊を得た。この銅鋳塊に、温度９０
０℃で、圧延率９３％となるように熱間圧延を施した。
得られた銅板の厚さは、約１４ｍｍであった。Examples 1 to 3 and Comparative Example 1 Oxygen was added to an electrolytic copper ingot having a purity of 99.99% by weight so as to have the content shown in Table 1, melted and cast to obtain a thickness of 200 mm. Was obtained. A temperature of 90 is applied to this copper ingot.
Hot rolling was performed at 0 ° C. so that the rolling reduction was 93%.
The thickness of the obtained copper plate was about 14 mm.
【００１６】[0016]
【表１】 [Table 1]
【００１７】この銅板に、室温下、圧延率９５％で一次
冷間圧延を施し、厚さ約０．７ｍｍの銅薄板を得た。次
いで、この銅薄板に、温度７００℃で保持して中間焼鈍
を施した後、室温下、圧延率９７．５％で二次冷間圧延
を施した。なお、この二次冷間圧延は、冷間圧延及び箔
圧延（最終の冷間圧延を箔圧延と言う。）を施すことに
より、行なった。以上のようにして、厚さ１７μｍの銅
圧延箔を得た。The copper plate was subjected to primary cold rolling at a rolling rate of 95% at room temperature to obtain a copper thin plate having a thickness of about 0.7 mm. Next, the copper thin plate was subjected to intermediate annealing while maintaining the temperature at 700 ° C., and then subjected to secondary cold rolling at room temperature at a rolling reduction of 97.5%. The secondary cold rolling was performed by performing cold rolling and foil rolling (final cold rolling is referred to as foil rolling). As described above, a 17 μm-thick rolled copper foil was obtained.
【００１８】得られた各銅圧延箔から、幅１０ｍｍ×長
さ１２０ｍｍ（長さ方向を圧延方向に平行とする。）の
試料を採取し、室温下、表１に示した放置期間で放置し
ておいた。そして、各試料の引張強さ（Ｎ／ｍｍ2）
を、ＪＩＳ Ｚ ２２４１に記載の条件に準拠して測定
し、引張強さの経時的変化を評価した。この結果を表１
に示した。なお、引張強さは、放置期間０日の試料で得
られた数値をＸ1とし、放置期間１００日の試料で得ら
れた数値をＸ2とし、放置期間２００日の試料で得られ
た数値をＸ3としたとき、放置期間０日の引張強さを１
００とし、放置期間１００日の引張強さを（Ｘ2／Ｘ1）
×１００で表わし、放置期間２００日の引張強さを（Ｘ
3／Ｘ1）×１００で表わした。From each of the obtained rolled copper foils, a sample having a width of 10 mm and a length of 120 mm (the length direction is parallel to the rolling direction) was sampled, and left at room temperature for a period shown in Table 1. I left it. And the tensile strength of each sample (N / mm 2 )
Was measured in accordance with the conditions described in JIS Z 2241, and the change over time in tensile strength was evaluated. Table 1 shows the results.
It was shown to. In addition, the tensile strength is defined as X 1 , the value obtained for the sample having a standing period of 0 days, X 2 is the value obtained for the sample having a standing period of 100 days, and the numerical value obtained for the sample having a standing period of 200 days. when was the X 3, the tensile strength of the left period 0 days 1
00, and the tensile strength of the standing period of 100 days is (X 2 / X 1 )
× 100, and the tensile strength for 200 days of standing
3 / X 1 ) × 100.
【００１９】比較例２ タフピッチ銅を溶解及び鋳造して、銅鋳塊を得る他は、
実施例１と同様にして、銅圧延箔を得た。この銅圧延箔
の引張強さの経時的変化を、実施例１と同様の方法で評
価した。この結果を表１に示した。Comparative Example 2 Tough pitch copper was melted and cast to obtain a copper ingot.
In the same manner as in Example 1, a rolled copper foil was obtained. The change over time in the tensile strength of the rolled copper foil was evaluated in the same manner as in Example 1. The results are shown in Table 1.
【００２０】表１の結果から明らかなように、実施例１
〜３に係る銅圧延箔は、比較例１及び２に係る銅圧延箔
に比べて、引張強さが経時的に低下しにくくなってい
る。As is clear from the results shown in Table 1, Example 1
In the copper rolled foils of Nos. 1 to 3, the tensile strength is less likely to decrease over time than in the copper rolled foils of Comparative Examples 1 and 2.
【００２１】[0021]
【作用及び発明の効果】以上述べたように、本発明に係
る方法で得られた銅圧延箔は、経時的に引張強さが低下
しにくいため、集電体として用いた場合、次のような効
果を奏する。As described above, the rolled copper foil obtained by the method according to the present invention is not easily reduced in tensile strength with time, so that when used as a current collector, Effect.
【００２２】（ｉ）集電体を長期間保管しておいた後、
この集電体に、活物質の塗布及び巻き取り処理を施し
て、二次電池の負極を作成する際に、集電体が破断しに
くい。従って、本発明に係る集電体を用いれば、二次電
池の負極の作成時に、トラブルの発生が少なく、合理的
に二次電池の負極を得ることができるという効果を奏す
る。(I) After storing the current collector for a long time,
When the current collector is coated with an active material and wound up to form a negative electrode of a secondary battery, the current collector is not easily broken. Therefore, when the current collector according to the present invention is used, there is an effect that when the negative electrode of the secondary battery is formed, troubles are less likely to occur and the negative electrode of the secondary battery can be obtained rationally.
【００２３】（ii）保管期間の異なる集電体であって
も、各集電体の引張強さの変動が少ない。従って、各集
電体を用いて、二次電池の負極を作成する際に、各集電
体毎に、引張強さを測定し、巻き取り張力等を調整する
必要性が少なくなる。依って、二次電池の負極の作成を
合理化しうるという効果を奏する。(Ii) Even if the current collectors have different storage periods, fluctuations in the tensile strength of each current collector are small. Therefore, when a negative electrode of a secondary battery is formed using each current collector, it is less necessary to measure the tensile strength and adjust the winding tension and the like for each current collector. Therefore, there is an effect that the production of the negative electrode of the secondary battery can be rationalized.
【００２４】（iii）集電体が二次電池に組み込まれた
後においても、集電体の引張強さの経時的低下が少な
い。特に、二次電池の充放電時における発熱により、集
電体に室温以上の高熱が与えられても、本発明に係る集
電体は、引張強さが大きく低下しにくい。このため、二
次電池の充放電時において、活物質の膨張・収縮等によ
り集電体に歪が負荷されても、集電体が破断しにくい。
従って、二次電池の性能が短期間に低下するのを防止で
き、二次電池の寿命を延ばすことができるという効果を
奏する。(Iii) Even after the current collector is incorporated in the secondary battery, the temporal decrease in the tensile strength of the current collector is small. In particular, even if high current of room temperature or more is given to the current collector due to heat generation during charging and discharging of the secondary battery, the current collector according to the present invention is unlikely to have a large decrease in tensile strength. For this reason, at the time of charging / discharging of the secondary battery, even if a strain is applied to the current collector due to expansion and contraction of the active material, the current collector is not easily broken.
Therefore, it is possible to prevent the performance of the secondary battery from being deteriorated in a short period of time, and it is possible to extend the life of the secondary battery.
【００２５】また、本発明に係る方法で得られた銅圧延
箔は、再結晶温度が比較的高いので、集電体として用い
た場合、次のような効果をも奏する。即ち、この集電体
は再結晶しにくいので、集電体の再結晶による電気特性
の変化を防止することができる。従って、二次電池の電
気特性が使用に伴って変化しにくくなり、二次電池に対
する信頼性が増すという効果をも奏する。Further, since the rolled copper foil obtained by the method according to the present invention has a relatively high recrystallization temperature, when used as a current collector, the following effects are also exhibited. That is, since the current collector is unlikely to be recrystallized, it is possible to prevent a change in electrical characteristics due to the recrystallization of the current collector. Therefore, the electrical characteristics of the secondary battery are less likely to change with use, and the effect of increasing the reliability of the secondary battery is also achieved.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 4/64 - 4/84 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) H01M 4/64-4/84
Claims (2)
素の含有量が０．００２重量％以下である銅鋳塊に、熱
間圧延、一次冷間圧延、中間焼鈍及び二次冷間圧延を施
して銅圧延箔を得ることを特徴とする、銅圧延箔よりな
る二次電池用集電体の製造方法。 1. A copper ingot having a copper content of 99.95% by weight or more and an oxygen content of 0.002% by weight or less,
Cold rolling, primary cold rolling, intermediate annealing and secondary cold rolling
Characterized by obtaining copper rolled foil,
Of manufacturing a current collector for a secondary battery.
リチウム電池又はポリマー電池である請求項１記載の銅
圧延箔よりなる二次電池用集電体の製造方法。 2. The copper according to claim 1, wherein the secondary battery is a lithium ion battery, a metal lithium battery or a polymer battery.
A method for producing a current collector for a secondary battery comprising a rolled foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25753197A JP3332335B2 (en) | 1997-09-05 | 1997-09-05 | Method for manufacturing current collector for secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25753197A JP3332335B2 (en) | 1997-09-05 | 1997-09-05 | Method for manufacturing current collector for secondary battery |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001346609A Division JP4230691B2 (en) | 2001-11-12 | 2001-11-12 | Secondary battery current collector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1186872A JPH1186872A (en) | 1999-03-30 |
| JP3332335B2 true JP3332335B2 (en) | 2002-10-07 |
Family
ID=17307590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25753197A Expired - Lifetime JP3332335B2 (en) | 1997-09-05 | 1997-09-05 | Method for manufacturing current collector for secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3332335B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5219973B2 (en) * | 2009-09-24 | 2013-06-26 | Ｊｘ日鉱日石金属株式会社 | Rolled copper foil excellent in shear workability, and negative electrode current collector, negative electrode plate and secondary battery using the same |
-
1997
- 1997-09-05 JP JP25753197A patent/JP3332335B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1186872A (en) | 1999-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5816285B2 (en) | Aluminum alloy foil for electrode current collector and method for producing the same | |
| JP6648088B2 (en) | Rolled copper foil for negative electrode current collector of secondary battery, secondary battery negative electrode and secondary battery using the same, and method of producing rolled copper foil for negative electrode current collector of secondary battery | |
| WO2012086448A1 (en) | Aluminum alloy foil for electrode current collectors and manufacturing method thereof | |
| JP5798128B2 (en) | Aluminum alloy foil for electrode current collector and method for producing the same | |
| EP2857535B1 (en) | Aluminum alloy foil for electrode collector, method for manufacturing same, and electrode material | |
| JP4160856B2 (en) | Lead-based alloy for lead-acid battery and lead-acid battery using the same | |
| JP4148175B2 (en) | Lead alloy and lead storage battery using the same | |
| WO1986005031A1 (en) | Grid for lead storage batteries and a method of producing the same | |
| JPH11339811A (en) | Copper alloy foil current collector for secondary battery | |
| JP2013001982A (en) | Rolled copper foil | |
| US6802917B1 (en) | Perforated current collectors for storage batteries and electrochemical cells, having improved resistance to corrosion | |
| JP2012201965A (en) | Copper foil and secondary battery using the same | |
| JP3760668B2 (en) | Secondary battery current collector | |
| JP3649373B2 (en) | Method for producing negative electrode current collector for secondary battery | |
| JP2011249150A (en) | Aluminum foil for power storage device collector and power storage device collector | |
| WO2020179515A1 (en) | Rolled copper foil for secondary battery negative electrode current collectors, secondary battery negative electrode current collector and secondary battery each using same, and method for manufacturing rolled copper foil for secondary battery negative electrode current collectors | |
| JPH1021928A (en) | Electrode material for secondary battery | |
| JP3332335B2 (en) | Method for manufacturing current collector for secondary battery | |
| JP4230691B2 (en) | Secondary battery current collector | |
| JPH1197032A (en) | Current collector made of aluminum foil for secondary cell | |
| JPH06267544A (en) | Electrode plate for lead-acid battery and lead-acid battery using the electrode plate | |
| JP2007172963A (en) | Negative electrode for lithium-ion secondary battery, and its manufacturing method | |
| JPH1186873A (en) | Collector for secondary battery | |
| JP2018076590A (en) | Aluminum alloy foil for electrode collector body and manufacturing method therefor | |
| JP4061910B2 (en) | Copper foil for batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070726 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080726 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090726 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090726 Year of fee payment: 7 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090726 Year of fee payment: 7 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090726 Year of fee payment: 7 |
|
| R370 | Written measure of declining of transfer procedure |
Free format text: JAPANESE INTERMEDIATE CODE: R370 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090726 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100726 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110726 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110726 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120726 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130726 Year of fee payment: 11 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |