JP2964833B2 - Lithium secondary battery - Google Patents
Lithium secondary batteryInfo
- Publication number
- JP2964833B2 JP2964833B2 JP5120861A JP12086193A JP2964833B2 JP 2964833 B2 JP2964833 B2 JP 2964833B2 JP 5120861 A JP5120861 A JP 5120861A JP 12086193 A JP12086193 A JP 12086193A JP 2964833 B2 JP2964833 B2 JP 2964833B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- secondary battery
- lithium secondary
- foil
- iron foil
- 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 - Fee Related
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]
【産業上の利用分野】本発明は、リチウム二次電池に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium secondary battery.
【０００２】[0002]
【従来の技術とその課題】リチウム二次電池は、高エネ
ルギー密度の新しい電池として期待されている。この電
池は、負極の集電体として銅箔を用いている。従来は、
強度の点からもっぱら圧延法により製造した銅箔を用い
ていた。2. Description of the Related Art A lithium secondary battery is expected as a new battery having a high energy density. This battery uses a copper foil as a negative electrode current collector. conventionally,
From the point of strength, a copper foil produced exclusively by a rolling method was used.
【０００３】しかし、圧延銅箔を用いたリチウム二次電
池は、銅箔の厚さが３５ミクロン以下になると著しく高
価になるため、薄形化がコスト面で困難であった。However, a lithium secondary battery using a rolled copper foil becomes extremely expensive when the thickness of the copper foil is 35 μm or less, so that it has been difficult to reduce the thickness in terms of cost.
【０００４】また、電解法によって製造した銅箔を用い
ると、厚さが３５μｍ以下ではコスト面で有利になる
が、圧延箔に比較して強度が低下するので、電極製造が
困難になるという新たな問題を生じる。[0004] When a copper foil manufactured by an electrolytic method is used, a thickness of 35 μm or less is advantageous in terms of cost, but the strength is lower than that of a rolled foil. Problems arise.
【０００５】[0005]
【課題を解決するための手段】本発明は、厚さ３５ミク
ロン以下の電解鉄箔を負極の集電体に用いたリチウム二
次電池を用いて上記課題を解決するものである。また、
前記の電解鉄箔の両面にニッケルメッキを施して本発明
の効果をより高めるものである。The present invention solves the above-mentioned problems by using a lithium secondary battery in which an electrolytic iron foil having a thickness of 35 μm or less is used as a current collector for a negative electrode. Also,
Nickel plating is applied to both surfaces of the electrolytic iron foil to further enhance the effect of the present invention.
【０００６】[0006]
【作用】鉄は、銅の約２０％と極めて安価な材料である
ので、コスト上本質的に有利である。鉄箔の厚さが３５
μｍ以下になると、圧延鉄箔に比較して電解鉄箔がより
安価となる。電解鉄箔は、圧延鉄箔に比較して強度が若
干低下するが、それでも銅箔に比較して５倍以上の引っ
張り強度を有するので、電極製造上なんら問題を生じな
い。鉄箔の問題点としては、輸送中、保管中などの錆の
発生があるが、取り扱いに注意すれば殆ど問題がない。
さらに、鉄箔の両面にニッケルメッキすることにより上
記問題は、完全に解決できる。Since iron is a very inexpensive material of about 20% of copper, it is essentially advantageous in cost. Iron foil thickness is 35
When the thickness is less than μm, the price of the electrolytic iron foil is lower than that of the rolled iron foil. Although the strength of the electrolytic iron foil is slightly lower than that of the rolled iron foil, it still has a tensile strength five times or more that of the copper foil. As a problem of iron foil, there is rust during transportation and storage, but there is almost no problem if care is taken in handling.
Further, the above problem can be completely solved by nickel plating on both sides of the iron foil.
【０００７】上記の結果、本発明のリチウム二次電池
は、負極集電体に用いる電解鉄箔が従来の銅箔に比較し
て約３０％ときわめて安価なため電池の製造原価を低下
させることができる。また、電解鉄箔に１ミクロンのニ
ッケルメッキを施した場合にでも、銅箔の約８０％程度
の原価となるのでコスト的にまだ有利である。As a result, in the lithium secondary battery of the present invention, the production cost of the battery is reduced because the electrolytic iron foil used for the negative electrode current collector is extremely inexpensive at about 30% as compared with the conventional copper foil. Can be. Further, even if the electrolytic iron foil is plated with nickel of 1 micron, the cost is still about 80% of that of the copper foil, which is still advantageous in terms of cost.
【０００８】また、電解鉄箔は、銅箔に比較して箔の引
っ張り強度が著しく高いので電極製造が容易になるこ
と、およびニッケルメッキによって電極の耐過放電特性
が銅箔に比較して向上することなどの作用もある。この
結果、本発明のリチウム二次電池は、安価で生産性に優
れ、耐過充電性能にも優れたものとなる。Further, the electrolytic iron foil has an extremely high tensile strength as compared with the copper foil, so that the production of the electrode is easy, and the overdischarge resistance of the electrode is improved by the nickel plating as compared with the copper foil. There are also actions such as doing. As a result, the lithium secondary battery of the present invention is inexpensive, has excellent productivity, and has excellent overcharge resistance.
【０００９】[0009]
【実施例】以下に、好適な実施例を用いて本発明を説明
する。The present invention will be described below with reference to preferred embodiments.
【００１０】図１に本発明のリチウム二次電池（Ａ）を
示す。この電池は、厚みが７．８ｍｍ、幅が４０ｍｍ、
長さが４８ｍｍの角型リチウム二次電池である。FIG. 1 shows a lithium secondary battery (A) of the present invention. This battery has a thickness of 7.8 mm, a width of 40 mm,
This is a square lithium secondary battery having a length of 48 mm.
【００１１】電池ケース１および電池ケース蓋板２は、
６０ミクロンのポリプロピレンフィルムで両面をコーテ
ィングした鋼板（厚み０．２２ｍｍ）を絞り加工して製
作した。The battery case 1 and the battery case cover plate 2
It was manufactured by drawing a steel plate (0.22 mm thick) coated on both sides with a 60-micron polypropylene film.
【００１２】正極板は、活物質のリチウムマンガンスピ
ネル（LiMn2 O4 、平均粒径５μｍ、９１重量部）、導
電助材のケッチェンブラック（２重量部）および結着剤
のポリフッ化ビニリデン粉末（７重量部）をＮーメチル
ピロリドン中で混合してペースト化し２０μｍの圧延ア
ルミニウム箔（正極集電体）に片面が７０μｍになるよ
うに両面塗布して得た。The positive electrode plate comprises lithium manganese spinel (LiMn 2 O 4 , average particle size 5 μm, 91 parts by weight) as an active material, ketjen black (2 parts by weight) as a conductive additive, and polyvinylidene fluoride powder as a binder. (7 parts by weight) was mixed in N-methylpyrrolidone to form a paste, which was applied to a rolled aluminum foil (positive electrode current collector) of 20 μm so that one side was 70 μm on both sides.
【００１３】負極板は、活物質の人造黒鉛（平均粒径２
５μｍ、９０重量部）と結着剤のポリフッ化ビニリデン
粉末（１０重量部）とをＮーメチルピロリドン中で混合
してペースト化し、厚さ２０ミクロンの電解鉄箔（負極
集電体）上に片面厚さ６０μｍに両面塗布して得た。こ
れら帯状の電極と微多孔膜セパレータ（厚さ２５μｍ）
とを楕円状に巻回して電極群３を形成した。The negative electrode plate is made of artificial graphite as an active material (average particle size: 2).
5 μm, 90 parts by weight) and polyvinylidene fluoride powder (10 parts by weight) as a binder are mixed in N-methylpyrrolidone to form a paste, and placed on a 20-μm-thick electrolytic iron foil (negative electrode current collector). It was obtained by coating both sides to a thickness of 60 μm on one side. These band-shaped electrodes and microporous membrane separator (25 μm thickness)
Were wound in an elliptical shape to form an electrode group 3.
【００１４】前記電極群の電極端子を電池端子と接続し
た。そして、エチレンカーボネート、ジメチルカーボネ
ートとジエチルカーボネートとを２：２：１の体積比で
混合した溶媒に六フッ化燐酸リチウムを１モル／リット
ル溶解させた電解液を注入後、二重巻締め方式により封
口した。この電池は、平均放電電圧が３．７Ｖで放電容
量が１０００ｍＡｈである。The electrode terminals of the electrode group were connected to battery terminals. Then, an electrolyte obtained by dissolving 1 mol / l of lithium hexafluorophosphate in a solvent in which ethylene carbonate, dimethyl carbonate and diethyl carbonate are mixed at a volume ratio of 2: 2: 1 is injected, and then the double winding method is used. I sealed it. This battery has an average discharge voltage of 3.7 V and a discharge capacity of 1000 mAh.
【００１５】つぎに前記実施例の電池（Ａ）で用いた負
極集電体の電解鉄箔を両面に１μｍのニッケルメッキを
施した電解鉄箔とした以外は、電池（Ａ）と同様なリチ
ウム二次電池を製作した。これを本発明の電池（Ｂ）と
する。Next, a lithium battery similar to the battery (A) was used except that the electrolytic iron foil of the negative electrode current collector used in the battery (A) of the embodiment was an electrolytic iron foil having nickel plating of 1 μm on both sides. A secondary battery was manufactured. This is designated as battery (B) of the present invention.
【００１６】なお、上記実施例では正極活物質としてリ
チウムマンガンスピネルを用いた場合を示したが、正極
活物質は基本的に限定されず、例えばリチウムコバルト
複合酸化物、二硫化チタン、二酸化マンガン、リチウム
マンガン複合酸化物、五酸化バナジウムおよび三酸化モ
リブデンなど種々のものを用いてよい。また、負極活物
質も基本的に限定されず、黒鉛以外の炭素材料やその他
のリチウムインターカレション材料を用いてもよい。さ
らに、電解質も基本的に限定されず、たとえば有機溶媒
として非プロトン溶媒であるエチレンカーボネイトなど
の環状エステル類およびテトラハイドロフラン，ジオキ
ソランなどのエーテル類を単独もしくは２種以上を混合
した溶媒を用い、支持電解質に LiAsF6 ，LiPF6 ，LiCF
3 SO3 ，LiBF4 などを１種または混合して用いてもよ
い。また、固体電解質を用いる場合には、リチウムイオ
ン導電性で電気絶縁性のものであれば何を用いてもよい
が、代表的なものとして、ポリエチレンオキサイドがあ
げられる。In the above embodiment, the case where lithium manganese spinel was used as the positive electrode active material was shown. However, the positive electrode active material is not fundamentally limited. For example, lithium cobalt composite oxide, titanium disulfide, manganese dioxide, Various materials such as lithium manganese composite oxide, vanadium pentoxide and molybdenum trioxide may be used. Further, the negative electrode active material is not fundamentally limited, and a carbon material other than graphite or another lithium intercalation material may be used. Furthermore, the electrolyte is also basically not limited. For example, as an organic solvent, a solvent in which a cyclic ester such as ethylene carbonate which is an aprotic solvent and an ether such as tetrahydrofuran or dioxolane alone or a mixture of two or more kinds is used, LiAsF 6 , LiPF 6 , LiCF for supporting electrolyte
3 SO 3 , LiBF 4 or the like may be used alone or in combination. When a solid electrolyte is used, any material may be used as long as it has lithium ion conductivity and electrical insulation, but a typical example is polyethylene oxide.
【００１７】つぎに負極集電体に圧延銅箔（２０μｍ）
を用いた以外は電池（Ａ）と同様の構成であるリチウム
二次電池製作した。これを従来の電池（ア）とする。Next, rolled copper foil (20 μm) is formed on the negative electrode current collector.
A lithium secondary battery having the same configuration as that of the battery (A) except for using was manufactured. This is referred to as a conventional battery (A).
【００１８】これらの電池の工場原価および負極板製造
工程中の不良発生率について、電池（Ａ）を１００％と
して表１に示す。Table 1 shows the factory cost of these batteries and the rate of occurrence of defects during the negative electrode plate manufacturing process, assuming that battery (A) is 100%.
【００１９】[0019]
【表１】 表より本発明の電池（Ａ），（Ｂ）は、従来の電池
（ア）に比較して安価でかつ工程不良が少ないとわか
る。これは、本発明の電池では、負極集電体に電解鉄箔
を用いているので、原材料費が安くかつ電極強度が高い
ので製造中の負電極切断などの不良が少なくなったため
である。工程不良の減少すなわち生産性の向上は、工場
原価の低減にさらに効果的である。なお、電池（Ｂ）の
不良率が電池（Ａ）のそれよりも低くなっている理由
は、鉄箔にニッケルメッキを施して錆不良が減少したた
めである。[Table 1] From the table, it can be seen that the batteries (A) and (B) of the present invention are inexpensive and have few process defects as compared with the conventional battery (A). This is because, in the battery of the present invention, the use of electrolytic iron foil for the negative electrode current collector reduces the cost of raw materials and increases the strength of the electrodes, thereby reducing defects such as disconnection of the negative electrode during manufacturing. Reduction of process defects, that is, improvement of productivity, is more effective in reducing factory costs. The reason why the failure rate of the battery (B) is lower than that of the battery (A) is that nickel plating is applied to the iron foil to reduce rust defects.
【００２０】[0020]
【発明の効果】本発明により、リチウム二次電池の原材
料費を低下させ、かつ、生産性を向上させることが可能
となる。According to the present invention, it is possible to reduce raw material costs of a lithium secondary battery and improve productivity.
【図１】本発明のリチウム二次電池を示した図。FIG. 1 is a diagram showing a lithium secondary battery of the present invention.
１ 電池ケース ２ 電池ケース蓋板 ３ 電極群 DESCRIPTION OF SYMBOLS 1 Battery case 2 Battery case cover plate 3 Electrode group
Claims (2)
集電体に用いたことを特徴とするリチウム二次電池。1. A lithium secondary battery using an electrolytic iron foil having a thickness of 35 μm or less as a current collector of a negative electrode.
用いた請求項１記載のリチウム二次電池。2. The lithium secondary battery according to claim 1, wherein an electrolytic iron foil plated with nickel on both sides is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5120861A JP2964833B2 (en) | 1993-04-23 | 1993-04-23 | Lithium secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5120861A JP2964833B2 (en) | 1993-04-23 | 1993-04-23 | Lithium secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06310147A JPH06310147A (en) | 1994-11-04 |
| JP2964833B2 true JP2964833B2 (en) | 1999-10-18 |
Family
ID=14796772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5120861A Expired - Fee Related JP2964833B2 (en) | 1993-04-23 | 1993-04-23 | Lithium secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2964833B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220021000A1 (en) * | 2020-07-16 | 2022-01-20 | Toyota Jidosha Kabushiki Kaisha | Sulfide all-solid-state battery |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3555298B2 (en) * | 1996-01-19 | 2004-08-18 | 日本電池株式会社 | Sealed secondary battery |
| JP5277523B2 (en) * | 2006-06-27 | 2013-08-28 | 日産自動車株式会社 | Assembled battery and manufacturing method of assembled battery |
| WO2013157598A1 (en) | 2012-04-19 | 2013-10-24 | 新日鐵住金株式会社 | Steel foil and method for producing same |
| KR20140108214A (en) | 2012-04-19 | 2014-09-05 | 신닛테츠스미킨 카부시키카이샤 | Steel foil and method for producing same |
| WO2014017968A1 (en) * | 2012-07-26 | 2014-01-30 | Lifesize Ab | Sustainable current collectors for lithium batteries |
| JP6938128B2 (en) * | 2016-10-14 | 2021-09-22 | 東洋鋼鈑株式会社 | Battery current collector and battery |
| CN115362580A (en) | 2020-03-31 | 2022-11-18 | 日铁化学材料株式会社 | Ni-plated steel foil for nickel-metal hydride secondary battery current collector, and nickel-metal hydride secondary battery |
| WO2024207458A1 (en) * | 2023-04-07 | 2024-10-10 | 宁德时代新能源科技股份有限公司 | Current collector and preparation method therefor, secondary battery, and electric device |
-
1993
- 1993-04-23 JP JP5120861A patent/JP2964833B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220021000A1 (en) * | 2020-07-16 | 2022-01-20 | Toyota Jidosha Kabushiki Kaisha | Sulfide all-solid-state battery |
| US12021243B2 (en) * | 2020-07-16 | 2024-06-25 | Toyota Jidosha Kabushiki Kaisha | Sulfide all-solid-state battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06310147A (en) | 1994-11-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |