JP2002164041A - Non-aqueous electrolyte battery - Google Patents
Non-aqueous electrolyte batteryInfo
- Publication number
- JP2002164041A JP2002164041A JP2000360622A JP2000360622A JP2002164041A JP 2002164041 A JP2002164041 A JP 2002164041A JP 2000360622 A JP2000360622 A JP 2000360622A JP 2000360622 A JP2000360622 A JP 2000360622A JP 2002164041 A JP2002164041 A JP 2002164041A
- Authority
- JP
- Japan
- Prior art keywords
- paste
- electrode plate
- positive electrode
- face
- fluororesin
- 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.)
- Withdrawn
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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、非水電解液電池
の、とくにその正極板に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonaqueous electrolyte battery, and more particularly to a positive electrode plate thereof.
【０００２】[0002]
【従来の技術】非水電解液電池の正極板は、アルミニウ
ム箔集電体にＬｉＣｏＯ2等の正極活物質を含むペース
トを塗布したもので、間欠塗工により集電体上にペース
ト未塗布部分を形成しているか、あるいは集電体に全面
塗布後、塗布部分の一部を剥離しているかのどちらかで
作製されている。2. Description of the Related Art A positive electrode plate of a non-aqueous electrolyte battery is obtained by applying a paste containing a positive electrode active material such as LiCoO 2 to an aluminum foil current collector. Is formed, or after the entire surface of the current collector is applied, a part of the applied portion is peeled off.
【０００３】間欠塗工とは塗工ダイに組み込まれたバル
ブの切り替えによってペースト排出の中断と再開を繰り
返す塗工方法であり、剥離工法で発生するロスを低減す
ることをねらいとしている。[0003] The intermittent coating is a coating method in which the paste discharge is repeatedly interrupted and restarted by switching a valve incorporated in the coating die, and the aim is to reduce the loss generated in the peeling method.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、間欠塗
工時にはペースト塗工部分から未塗工部分への切り替え
時に、ペーストが液状であるために、アルミニウム芯材
上にダレが生じ、このダレ部分の重量分だけ、極板の容
量が減少していた。However, at the time of intermittent coating, when the paste is switched from the paste-coated portion to the uncoated portion, the paste is in a liquid state, causing dripping on the aluminum core material. The capacity of the electrode plate was reduced by the weight.
【０００５】本発明は、このような課題を解決するもの
であり、間欠塗工時のペースト端面のダレを防ぎ、極板
の容量の低下を防止することを目的とする。An object of the present invention is to solve such a problem, and it is an object of the present invention to prevent sagging of a paste end face at the time of intermittent coating and prevent a capacity of an electrode plate from decreasing.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明は正極板と負極板とセパレータを有し、前記
正極板は、芯材に正極活物質ペーストを間欠に塗工され
ており、芯材上においてペースト端面に当たる部分の周
縁には、予めフッ素樹脂が塗布されたものである。In order to solve the above problems, the present invention comprises a positive electrode plate, a negative electrode plate and a separator, wherein the positive electrode plate is obtained by intermittently coating a core with a positive electrode active material paste. In addition, the periphery of the portion corresponding to the paste end face on the core material is coated with a fluororesin in advance.
【０００７】芯材上でのフッ素樹脂塗布範囲は、正極ペ
ーストの端面を中心とし、この端面からペーストの塗工
部分側に５ｍｍ以下で、未塗工部分側に１ｍｍ以下であ
ることが好ましい。The range of application of the fluororesin on the core material is preferably 5 mm or less from the end face of the positive electrode paste to the paste-coated portion side and 1 mm or less from the end face to the uncoated portion side.
【０００８】本発明では、予めフッ素樹脂を間欠に塗布
したアルミニウム芯材に改めて正極ペーストを間欠に塗
工することを特徴とし、フッ素樹脂層に対するペースト
との接触角を上げることで、単位面積当たりにより多く
の活物質を乗せることが出来、また塗工開始と終了時の
切り替え時にペースト層の形状がダレることを防止でき
ると考えられる。The present invention is characterized in that a positive electrode paste is intermittently applied again to an aluminum core material in which a fluororesin is intermittently applied in advance, and by increasing the contact angle of the paste with the fluororesin layer, a unit area per unit area is increased. Therefore, it is considered that more active materials can be loaded, and that the shape of the paste layer can be prevented from sagging at the time of switching between the start and end of coating.
【０００９】[0009]
【実施例】図２は本実施例で用いた円筒形非水電解液二
次電池の縦断面図を示す。図２において、７は耐有機電
解質性のステンレス鋼鈑を加工した電池ケースで、６は
絶縁板を示す。また正極板１及び負極板３がセパレータ
５を介して複数回渦巻状に巻かれている。そして正極板
１から正極リード２が引き出されて封口板に接続されて
いる。FIG. 2 is a longitudinal sectional view of a cylindrical nonaqueous electrolyte secondary battery used in this embodiment. In FIG. 2, reference numeral 7 denotes a battery case obtained by processing a stainless steel sheet having resistance to organic electrolyte, and reference numeral 6 denotes an insulating plate. The positive electrode plate 1 and the negative electrode plate 3 are spirally wound a plurality of times with the separator 5 interposed therebetween. Then, the positive electrode lead 2 is pulled out from the positive electrode plate 1 and connected to the sealing plate.
【００１０】以下正極板１、負極板３、電解液など詳し
く説明する。Hereinafter, the positive electrode plate 1, the negative electrode plate 3, the electrolyte and the like will be described in detail.
【００１１】正極板１は、次の方法にて作製した。ま
ず、正極活物質であるＬｉＣｏＯ2の粉末１００重量部
に、アセチレンブラック５重量部、フッ素樹脂系結着剤
７重量部を混合し、これをＣＭＣ水溶液に懸濁させてペ
ーストを得た。このペーストをダイコータを用いてアル
ミニウム芯材に塗工し、本発明の正極板とした。The positive electrode plate 1 was manufactured by the following method. First, 100 parts by weight of LiCoO 2 powder as a positive electrode active material, 5 parts by weight of acetylene black and 7 parts by weight of a fluororesin binder were mixed and suspended in an aqueous CMC solution to obtain a paste. This paste was applied to an aluminum core material using a die coater to obtain a positive electrode plate of the present invention.
【００１２】アルミニウム芯材にはペースト塗工端面に
当たる部分にフッ素樹脂を塗布しており、塗布範囲はペ
ースト塗工端面を中心にしてペーストを塗工した側に５
ｍｍ、ペーストを塗工してない側に１ｍｍとし、厚みは
０．００１０ｍｍとした。The aluminum core material is coated with a fluororesin at the portion corresponding to the paste-coated end face, and the range of application is 5 to the paste-coated side with the paste-coated end face as the center.
mm, 1 mm on the side where the paste was not applied, and 0.0010 mm in thickness.
【００１３】また、フッ素樹脂の溶剤は、ポリテトラフ
ルオロエチレン（以下、ＰＴＦＥ）系のディスパージョ
ンを増粘剤としてＣＭＣで希釈したものを用いた。ＰＴ
ＦＥ系はフッ素樹脂の中でも対水との接触角が大きく、
濡れ難いので採用した。As the solvent for the fluororesin, a polytetrafluoroethylene (hereinafter, PTFE) -based dispersion diluted with CMC as a thickener was used. PT
FE type has a large contact angle with water among fluororesins,
Adopted because it is difficult to get wet.
【００１４】また比較のために、アルミニウム芯材にフ
ッ素樹脂を全く塗布していない以外は本発明と同様の極
板も作製した。For comparison, an electrode plate similar to that of the present invention was prepared except that no fluorine resin was applied to the aluminum core material.
【００１５】図３は、正極板１の展開図であり、リード
を溶接する部分はペーストが不要であり、この部分を間
欠塗工することにより確保している。FIG. 3 is an exploded view of the positive electrode plate 1. The portion to which the lead is welded does not require paste, and this portion is secured by intermittent coating.
【００１６】図４に間欠塗工後のペースト終端部形状を
間欠塗工部分の端面から厚みを測定することで、ペース
ト端面の形状を確認した。In FIG. 4, the shape of the end face of the paste was confirmed by measuring the thickness of the end face of the paste after the intermittent coating from the end face of the intermittent coating portion.
【００１７】図４に示すようにペーストの終端のダレ
が、フッ素樹脂を塗布しておくことで、小さくなってい
た。これは、フッ素樹脂のペーストに対しての濡れ性が
悪いためにペーストがダレにくくなったものと考えられ
る。As shown in FIG. 4, the dripping at the end of the paste has been reduced by applying a fluororesin. This is presumably because the wettability of the fluororesin to the paste was poor, and the paste was less likely to sag.
【００１８】乾燥後厚みが０．１８ｍｍになるまで圧延
した。その後長さ２５０ｍｍ、幅３５ｍｍの大きさに切
断し、正極リード２を溶着した。その後２５０℃の熱乾
燥させた。熱乾燥後の極板の端面には、樹脂はほとんど
なくなっていた。After drying, it was rolled to a thickness of 0.18 mm. Thereafter, it was cut into a size of 250 mm in length and 35 mm in width, and the positive electrode lead 2 was welded. Thereafter, it was dried by heating at 250 ° C. Almost no resin was left on the end face of the electrode plate after heat drying.
【００１９】負極板３は、次のように作製した。まず、
コークスを加熱処理して得た炭素粉末１００重量部に、
フッ素樹脂系結着剤１０重量部を混合し、これをＣＭＣ
水溶液に懸濁してペースト状にし、このペーストを厚さ
０．０１５ｍｍの銅箔の両面に塗布し、乾燥後厚さ０．
２ｍｍになるまで圧延し、長さ２８０ｍｍ、幅３７ｍｍ
に切断し、リード溶着を行い、熱乾燥して作製した。The negative electrode plate 3 was manufactured as follows. First,
100 parts by weight of carbon powder obtained by heat treatment of coke,
10 parts by weight of a fluororesin-based binder were mixed, and this was mixed with CMC.
The paste is suspended in an aqueous solution to form a paste. The paste is applied to both sides of a copper foil having a thickness of 0.015 mm, dried, and dried to a thickness of 0.1 mm.
Rolled to 2mm, length 280mm, width 37mm
Into pieces, and the leads were welded and dried by heating.
【００２０】正、負極板とセパレータを用いて群構成を
行い、この極板群を直径１３．８ｍｍ、高さ５０ｍｍの
電池ケースに挿入した。A group was formed using positive and negative electrode plates and a separator, and this electrode plate group was inserted into a battery case having a diameter of 13.8 mm and a height of 50 mm.
【００２１】電解液には、炭酸エチレンと炭酸ジエチル
の等容積混合溶媒に、六フッ化燐酸リチウム１ｍｏｌ／
ｌの割合で溶解したものを用い、その所定量を注入した
後、電池を密封口し、試験電池とした。正極板１を用い
た電池を本発明の電池、正極板２を用いた電池を比較の
電池とした。In the electrolyte, 1 mol / mol of lithium hexafluorophosphate was mixed with an equal volume mixed solvent of ethylene carbonate and diethyl carbonate.
After dissolving at a predetermined rate, a predetermined amount of the solution was injected, and the battery was sealed to form a test battery. The battery using the positive electrode plate 1 was a battery of the present invention, and the battery using the positive electrode plate 2 was a comparative battery.
【００２２】本発明の電池と比較の電池の放電レート特
性を図５に示した。図５に示したように、比較の電池で
は、ペーストの間欠塗工部の端面のダレが大きいため
に、その分だけ極板の活物質量が少なくなり、容量低下
の原因となったと考えられる。本発明の電池では、間欠
塗工終端の端面の周囲にフッ素樹脂を塗布したため、間
欠塗工終端のダレが小さくなり、高容量を実現出来てい
る。FIG. 5 shows the discharge rate characteristics of the battery of the present invention and the battery of the comparative example. As shown in FIG. 5, in the comparative battery, since the sagging of the end face of the intermittently applied portion of the paste was large, the amount of the active material of the electrode plate was reduced by that much, and it is considered that the capacity was reduced. . In the battery of the present invention, since the fluororesin is applied around the end face of the intermittent coating end, sag at the intermittent coating end is reduced, and high capacity can be realized.
【００２３】ゆえに本発明により、芯材に間欠に正極ペ
ーストが塗工される始端と終端部に当たる位置に予めフ
ッ素樹脂層を形成することでフッ素樹脂のペーストに対
する接触角が大きくなり、ペースト端面のダレが小さく
なることで、単位面積当たりにより多くの活物質が塗布
できたからだと考えられる。Therefore, according to the present invention, by forming a fluororesin layer in advance at positions corresponding to the start and end portions where the positive electrode paste is intermittently applied to the core material, the contact angle of the fluororesin to the paste is increased, and This is probably because the reduction in sag allowed more active material to be applied per unit area.
【００２４】[0024]
【発明の効果】以上のように、芯材にペーストを塗工し
て極板を作製する際、予めペーストを塗工する前に、芯
材のペースト塗布面にフッ素樹脂を部分的に塗布してお
くことで、ペーストを塗布したときに、ペースト塗布終
端部の形状を安定化させることが出来、極板の容量低下
を防止できる。As described above, when preparing the electrode plate by applying the paste to the core material, the fluororesin is partially applied to the paste application surface of the core material before the paste is applied. By doing so, when the paste is applied, the shape of the paste application end portion can be stabilized, and the capacity of the electrode plate can be prevented from lowering.
【図１】（Ａ）本発明の非水電解液二次電池用極板の平
面図 （Ｂ）従来の非水電解液二次電池用極板の平面図FIG. 1A is a plan view of an electrode plate for a non-aqueous electrolyte secondary battery of the present invention. FIG. 1B is a plan view of a conventional electrode plate for a non-aqueous electrolyte secondary battery.
【図２】本実施例で用いた非水電解液二次電池の縦断面
図FIG. 2 is a longitudinal sectional view of a non-aqueous electrolyte secondary battery used in the present embodiment.
【図３】正極板１の展開図FIG. 3 is a development view of the positive electrode plate 1.
【図４】本発明の電池と比較の電池の正極板の端面形状
の様子を示す図FIG. 4 is a diagram showing an end face shape of a positive electrode plate of a battery of the present invention and a battery of a comparative example.
【図５】本発明の電池と比較の電池の電池容量を示す図FIG. 5 is a diagram showing the battery capacity of a battery in comparison with the battery of the present invention.
１ 正極板 ２ 正極リード ３ 負極板 ４ 負極リード ５ セパレータ ６ 絶縁板 ７ ケース DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Positive electrode lead 3 Negative electrode plate 4 Negative electrode lead 5 Separator 6 Insulating plate 7 Case
───────────────────────────────────────────────────── フロントページの続き (72)発明者 荒瀧 安弘 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 小林 秀幸 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 5H017 AA03 AS02 BB08 CC01 EE05 HH03 5H029 AJ14 AK03 AL06 AM03 AM07 BJ02 BJ14 CJ22 DJ07 HJ04 HJ12 5H050 AA19 BA17 CA08 CB07 DA02 DA04 EA10 EA24 GA22 HA04 HA12 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhiro Arataki 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. Terms (reference) 5H017 AA03 AS02 BB08 CC01 EE05 HH03 5H029 AJ14 AK03 AL06 AM03 AM07 BJ02 BJ14 CJ22 DJ07 HJ04 HJ12 5H050 AA19 BA17 CA08 CB07 DA02 DA04 EA10 EA24 GA22 HA04 HA12
Claims (2)
記正極板は、芯材に正極活物質ペーストを間欠に塗工さ
れており、芯材上においてペースト端面に当たる部分の
両側周縁には、予めフッ素樹脂が塗布された非水電解液
電池。1. A positive electrode plate, a negative electrode plate, and a separator, wherein the positive electrode plate is formed by intermittently coating a positive electrode active material paste on a core material, and has a peripheral surface on both sides of a portion corresponding to a paste end face on the core material. And a non-aqueous electrolyte battery to which a fluororesin has been applied in advance.
ペーストの端面を中心とし、この端面からペーストの塗
工部分側に５ｍｍ以下で、未塗工部分側に１ｍｍ以下で
ある請求項１記載の非水電解液電池。2. The range of application of the fluororesin on the core material is 5 mm or less from the end face of the positive electrode paste to the paste-coated portion side and 1 mm or less from the end face to the uncoated portion side. 2. The non-aqueous electrolyte battery according to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000360622A JP2002164041A (en) | 2000-11-28 | 2000-11-28 | Non-aqueous electrolyte battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000360622A JP2002164041A (en) | 2000-11-28 | 2000-11-28 | Non-aqueous electrolyte battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002164041A true JP2002164041A (en) | 2002-06-07 |
Family
ID=18832190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000360622A Withdrawn JP2002164041A (en) | 2000-11-28 | 2000-11-28 | Non-aqueous electrolyte battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002164041A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005310619A (en) * | 2004-04-23 | 2005-11-04 | Matsushita Electric Ind Co Ltd | Lithium-ion secondary battery |
| JP2012178265A (en) * | 2011-02-25 | 2012-09-13 | Hitachi Vehicle Energy Ltd | Electrode for battery and secondary battery |
| WO2019077943A1 (en) | 2017-10-19 | 2019-04-25 | Ｎｅｃエナジーデバイス株式会社 | Method for manufacturing current collector electrode sheet, current collector electrode sheet, and battery |
-
2000
- 2000-11-28 JP JP2000360622A patent/JP2002164041A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005310619A (en) * | 2004-04-23 | 2005-11-04 | Matsushita Electric Ind Co Ltd | Lithium-ion secondary battery |
| JP2012178265A (en) * | 2011-02-25 | 2012-09-13 | Hitachi Vehicle Energy Ltd | Electrode for battery and secondary battery |
| WO2019077943A1 (en) | 2017-10-19 | 2019-04-25 | Ｎｅｃエナジーデバイス株式会社 | Method for manufacturing current collector electrode sheet, current collector electrode sheet, and battery |
| US11563207B2 (en) | 2017-10-19 | 2023-01-24 | Envision Aesc Japan Ltd. | Method of manufacturing current collector electrode sheet, current collector electrode sheet, and battery |
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