JP2000048822A - Lithium secondary battery and manufacture of positive electrode plate thereof - Google Patents
Lithium secondary battery and manufacture of positive electrode plate thereofInfo
- Publication number
- JP2000048822A JP2000048822A JP11149916A JP14991699A JP2000048822A JP 2000048822 A JP2000048822 A JP 2000048822A JP 11149916 A JP11149916 A JP 11149916A JP 14991699 A JP14991699 A JP 14991699A JP 2000048822 A JP2000048822 A JP 2000048822A
- Authority
- JP
- Japan
- Prior art keywords
- current collector
- positive electrode
- electrode plate
- active material
- secondary battery
- 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.)
- Granted
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
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、リチウム二次電池
とその極板に関するものである。The present invention relates to a lithium secondary battery and an electrode plate thereof.
【０００２】[0002]
【従来の技術】従来、繰り返し充放電の使用や電池組立
工程注中の集電体からの活物質の剥離を防ぐために集電
体表面にクロメート処理やコロナ放電処理を施すことが
提案されている。（特開昭５６−５７２６１号公報、特
開平７−１３５０２３号公報）また、リチウムイオン二
次電池の極板製造に関して、活物質と結着剤及び増粘剤
の濡れ性を改良する方法として、界面活性剤存在下で混
練分散を行う方法が示されている。（特開平８−１９０
９１２号公報）2. Description of the Related Art Conventionally, it has been proposed to perform a chromate treatment or a corona discharge treatment on the surface of a current collector in order to prevent repeated use of charge / discharge and separation of an active material from the current collector during a battery assembly process. . (JP-A-56-57261 and JP-A-7-135023) Further, with respect to the production of an electrode plate of a lithium ion secondary battery, as a method for improving the wettability of an active material, a binder and a thickener, A method for performing kneading and dispersion in the presence of a surfactant is disclosed. (JP-A-8-190
No. 912)
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
電池用極板においては、活物質と結着剤及び増粘剤との
濡れ性を改良すると共に、活物質を塗布した後の集電体
と活物質との密着性を満足させることは困難であった。
そのため、高温保存後や充放電を繰り返すうちに集電体
から活物質が剥離、脱落して充放電容量が低下するとい
った問題があった。However, in the above-mentioned battery electrode, the wettability of the active material with the binder and the thickener is improved, and the current collector after the active material is applied is improved. It was difficult to satisfy the adhesiveness with the active material.
Therefore, there has been a problem that the active material is separated from the current collector and falls off after the storage at a high temperature or during repeated charge / discharge, and the charge / discharge capacity is reduced.
【０００４】そこで、本発明は前記する従来からの課題
を解決して活物質による集電体の腐食が少く、集電体か
らの活物質の剥離や、脱落が少くて放電容量が大きいリ
チウム二次電池を提供しようとするものである。Accordingly, the present invention solves the above-mentioned conventional problems by reducing the corrosion of the current collector by the active material, and the peeling or falling off of the active material from the current collector is small, and the lithium secondary battery has a large discharge capacity. It is intended to provide a secondary battery.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記のような
課題を解決するもので、集電体上への活物質を主成分と
する合剤から成るペーストの塗布に先行して集電体表面
にベーマイト処理を行うことを特徴とする電池用極板と
それを用いた電池を提供するものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is preferred that a current collector be applied prior to the application of a paste composed of a mixture containing an active material as a main component on a current collector. An object of the present invention is to provide a battery electrode plate characterized by performing boehmite treatment on a body surface and a battery using the same.
【０００６】また、本発明は、金属箔よりなる集電体に
正極活物質を含んだペーストを塗布した後に乾燥して製
造するリチウム二次電池用極板の製造方法において、前
記のペーストの塗布に先行して、表面にクロム酸化物層
を形成するクロメート処理をした集電体を用いることと
したものである。The present invention also relates to a method of manufacturing an electrode plate for a lithium secondary battery, which is manufactured by applying a paste containing a positive electrode active material to a current collector made of a metal foil and then drying the paste. Prior to this, a current collector subjected to a chromate treatment for forming a chromium oxide layer on the surface is used.
【０００７】[0007]
【発明の実施の形態】本発明は、正、負極のいずれか一
方の極板の集電体表面にベーマイト処理を施すか、ある
いは正極板の集電体表面にクロメート処理を施し、つい
で集電体上に電極活物質を含んだ合剤から成るペースト
を塗布した後、乾燥して極板を得るものである。この極
板を使用した電池は充放電を繰り返して使用しても、充
放電容量の劣化や負荷特性の劣化を小さく抑えることが
可能である。BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a method of performing boehmite treatment on the current collector surface of one of the positive and negative electrode plates, or performing chromate treatment on the current collector surface of the positive electrode plate, and then collecting the current. A paste made of a mixture containing an electrode active material is applied on the body and then dried to obtain an electrode plate. The battery using this electrode plate can suppress the deterioration of the charge / discharge capacity and the deterioration of the load characteristics even if the battery is repeatedly charged and discharged.
【０００８】[0008]
【実施例】以下、本発明の実施例として、リチウムイオ
ン電池用正極集電体にベーマイト処理を施した場合につ
いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a case where a boehmite treatment is applied to a positive electrode current collector for a lithium ion battery will be described below.
【０００９】（実施例１）本発明のリチウム二次電池の
一実施の形態は図１に示すような円筒形リチウム二次電
池で前記本発明により得られた極板群と電解液とこれら
を収容する電池ケース４からなる。極板群は、シート状
の前記正極用極板１とシート状の負極用極板２と正極用
極板１と負極用極板２との間を絶縁するシート状のセパ
レータ３と正極リード７と負極リード８と上部絶縁板９
と下部絶縁板１０とからなる。セパレータ３は多孔質ポ
リエチレンフィルムであり、これらが重ねられ渦巻き状
に巻回されて、円筒形の電池ケース４内に収容されてい
る。(Embodiment 1) One embodiment of the lithium secondary battery of the present invention is a cylindrical lithium secondary battery as shown in FIG. It consists of a battery case 4 to be housed. The electrode group includes a sheet-shaped positive electrode plate 1, a sheet-shaped negative electrode plate 2, a sheet-shaped separator 3 for insulating between the positive electrode plate 1 and the negative electrode plate 2, and a positive electrode lead 7. , Negative electrode lead 8 and upper insulating plate 9
And a lower insulating plate 10. The separator 3 is a porous polyethylene film, and these are stacked and spirally wound, and are housed in a cylindrical battery case 4.
【００１０】電池ケース４は、耐有機電解液性のステン
レス鋼板を深絞り成形して得ており、極板群、電解液挿
入後、開口部は封口板５と電池ケース４との間を絶縁し
ガスシールするガスケット６により封口されている。The battery case 4 is obtained by deep-drawing a stainless steel sheet having resistance to organic electrolytic solution and, after inserting the electrode plate and the electrolytic solution, the opening insulates between the sealing plate 5 and the battery case 4. And sealed by a gasket 6 for gas sealing.
【００１１】まず、ベーマイト処理として正極集電体で
ある３０μｍのアルミニウム箔上にトリエタノールアミ
ン１２ｃｃ／ｌ溶液中に浸漬した後、１００℃で４時間
乾燥させ、表面改質させ、酸化被膜を形成した。このと
き、被膜の厚みは０．５〜５．０μｍが望ましい。これ
は、被膜の厚みが０．５μｍより薄い場合は、表面を改
質した効果が十分得られず、活物質との密着性がそれほ
どよくならないためであり、５．０μｍより厚い場合
は、同じ大きさの電池ケースに挿入できる活物質量が減
少することによる電池容量の低下の影響が大きくなって
しまうためである。First, as a boehmite treatment, a 30 μm aluminum foil as a positive electrode current collector is immersed in a 12 cc / l solution of triethanolamine, and then dried at 100 ° C. for 4 hours to modify the surface to form an oxide film. did. At this time, the thickness of the coating is desirably 0.5 to 5.0 μm. This is because, when the thickness of the coating is less than 0.5 μm, the effect of modifying the surface is not sufficiently obtained, and the adhesion to the active material is not so good. This is because the effect of a decrease in battery capacity due to a decrease in the amount of active material that can be inserted into a large-sized battery case is increased.
【００１２】次に、正極用極板１の製造方法を説明す
る。正極活物質としてＬｉＣｏＯ2粉末を５０重量部、
導電剤としてアセチレンブラックを１．５重量部、結着
剤としてＰＴＦＥ５０重量部水溶液を７重量部、そし
て、増粘剤としてカルボキシメチルセルロース１重量部
水溶液を４１．５重量部を配合し、混合分散して正極用
の活物質を主成分とする合剤から成るペーストを得た。
この正極用ペーストを本発明のベーマイト処理をしたア
ルミニウム箔上にダイコーターを用いて両面に塗布し
て、乾燥後、さらにＰＴＦＥの溶融温度である２００〜
３００℃で正極用極板を加熱して集電体と正極合剤層の
密着性を改良させる。この後、厚み０．１８ｍｍに圧延
し、切断して本発明のシート状の正極用極板１を作成し
た。Next, a method of manufacturing the positive electrode plate 1 will be described. 50 parts by weight of LiCoO 2 powder as a positive electrode active material,
1.5 parts by weight of acetylene black as a conductive agent, 7 parts by weight of 50 parts by weight aqueous solution of PTFE as a binder, and 41.5 parts by weight of 1 part by weight aqueous solution of carboxymethyl cellulose as a thickener were mixed and dispersed. As a result, a paste composed of a mixture mainly containing an active material for a positive electrode was obtained.
This positive electrode paste is applied on both sides using a die coater on the boehmite-treated aluminum foil of the present invention, and after drying, the PTFE has a melting temperature of 200 to
The positive electrode plate is heated at 300 ° C. to improve the adhesion between the current collector and the positive electrode mixture layer. Thereafter, the sheet was rolled to a thickness of 0.18 mm and cut to prepare a sheet-like positive electrode plate 1 of the present invention.
【００１３】負極用極板２の製造方法を説明する。負極
活物質として鱗片状黒鉛粉末５０重量部、増粘剤として
カルボキシメチルセルロース１重量部を水９９重量部に
溶解した水溶液４５重量部、そして、結着剤としてスチ
レンブタジエンゴム５重量部を配合し混合分散して負極
用ペーストを作成した。得られた負極用ペーストをダイ
コーターを用いて厚さ４０μｍの銅箔からなる負極用極
板２を作成した。A method of manufacturing the negative electrode plate 2 will be described. 50 parts by weight of flake graphite powder as a negative electrode active material, 45 parts by weight of an aqueous solution obtained by dissolving 1 part by weight of carboxymethyl cellulose in 99 parts by weight of water as a thickener, and 5 parts by weight of styrene butadiene rubber as a binder are mixed and mixed. This was dispersed to prepare a negative electrode paste. Using the obtained paste for a negative electrode, a negative electrode plate 2 made of a copper foil having a thickness of 40 μm was prepared using a die coater.
【００１４】電解液は、炭酸エチレン３０ｖｏｌ％と炭
酸ジエチル５０ｖｏｌ％とプロピオン酸メチル２０ｖｏ
ｌ％との混合液にＬｉＰＦ6を１ｍｏｌ／ｌの濃度に溶
解したものからなる。この電解液は、電池ケース内に収
容され、正極活物質層および負極活物質層内に含浸され
て、電池反応において、多孔質セパレータ３の微小孔を
通して正極用極板１と負極用極板２との間のリチウムイ
オンの移動を担う。The electrolyte is composed of 30 vol% of ethylene carbonate, 50 vol% of diethyl carbonate and 20 vol% of methyl propionate.
1% LiPF 6 dissolved at a concentration of 1 mol / l. This electrolytic solution is accommodated in a battery case, impregnated in the positive electrode active material layer and the negative electrode active material layer, and passes through the fine holes of the porous separator 3 and the positive electrode plate 1 and the negative electrode plate 2 in the battery reaction. Responsible for the transfer of lithium ions to and from.
【００１５】前記正極用極板１を用いて電池を作成し、
そのサイクル特性を確認した。電池は、直径１７ｍｍ、
高さ５０ｍｍのサイズのものを作成した。A battery is prepared using the positive electrode plate 1,
The cycle characteristics were confirmed. The battery is 17mm in diameter,
A thing with a size of 50 mm in height was created.
【００１６】その比較例として、正極集電体表面にベー
マイト処理を行わず無処理である他は同様にして電池を
作成した。As a comparative example, a battery was prepared in the same manner except that the surface of the positive electrode current collector was not subjected to the boehmite treatment and was not treated.
【００１７】本発明の電池と比較例の電池について、充
電は４．１Ｖまで５００ｍＡの定電流で行い、４．１Ｖ
になった時点で４．１Ｖの定電圧充電に切り換え、充電
時間の合計を２時間とし、放電は、２０℃中で７２０ｍ
Ａで行い、放電電位が３．０Ｖになった時点で放電を終
了して１サイクルとし、次の充電を開始した。このよう
にして、充放電を繰り返したときの前記本発明の電池と
比較例の電池のサイクル寿命特性を縦軸に容量維持率、
横軸にサイクル数をとって図２に示した。図２より本発
明の電池は比較例の電池より充放電を繰り返しても容量
の劣化が少なくサイクル特性に優れていることがわかっ
た。For the battery of the present invention and the battery of the comparative example, charging was performed at a constant current of 500 mA up to 4.1 V.
At this point, the charging was switched to 4.1 V constant voltage charging, the total charging time was 2 hours, and the discharge was 720 m at 20 ° C.
At A, the discharge was terminated when the discharge potential reached 3.0 V to make one cycle, and the next charge was started. In this manner, the cycle retention characteristics of the battery of the present invention and the battery of the comparative example when the charge and discharge are repeated are plotted on the vertical axis as the capacity retention ratio,
FIG. 2 shows the number of cycles on the horizontal axis. From FIG. 2, it was found that the battery of the present invention had less capacity deterioration and excellent cycle characteristics even after repeated charging and discharging than the battery of the comparative example.
【００１８】これは、本発明の電池において、正極集電
体表面にベーマイト処理を行うことで集電体表面が針状
構造を有し、この部位に高分子であるＰＴＦＥが三次元
的にからまり、アンカー効果が発現することで集電体と
活物質を主成分とする合剤層との密着性が改良されるた
めと考えられる。これにより、充放電を繰り返して活物
質を含む合剤層が膨張収縮しても合剤層が集電体からは
がれにくくなる。This is because, in the battery of the present invention, by performing boehmite treatment on the surface of the positive electrode current collector, the surface of the current collector has a needle-like structure, and PTFE, which is a polymer, is three-dimensionally removed at this site. In other words, it is considered that the adhesion effect between the current collector and the mixture layer containing the active material as a main component is improved by expressing the anchor effect. This makes it difficult for the mixture layer to peel off from the current collector even if the mixture layer containing the active material expands and contracts due to repeated charge and discharge.
【００１９】また、これら本発明の電池と比較例の電池
を充電状態で６０℃中に２０日間保存した後、常温で数
回充放電を繰り返し、７２０ｍＡで放電し、電圧が３．
０Ｖに達するまでの容量を求め、その保存前の容量に対
する割合を（表１）に示した。After storing the battery of the present invention and the battery of the comparative example in a charged state at 60 ° C. for 20 days, the battery was repeatedly charged and discharged several times at room temperature, and discharged at 720 mA.
The capacity up to 0 V was determined, and the ratio to the capacity before storage is shown in (Table 1).
【００２０】[0020]
【表１】 [Table 1]
【００２１】（表１）に示すとおり、高温保存において
も本発明の電池は容量の劣化が少ないことがわかった。As shown in (Table 1), it was found that the battery of the present invention showed little deterioration in capacity even at high temperature storage.
【００２２】本実施例ではリチウム二次電池用の正極用
集電体にベーマイト処理を施した場合を示したが、ベー
マイト処理を施すのは負極用集電体でもよくまた、他の
電池系の極板に適用しても同様の効果が得られる。In this embodiment, the case where the current collector for the positive electrode for the lithium secondary battery is subjected to the boehmite treatment is shown. However, the current collector for the negative electrode may be subjected to the boehmite treatment. Similar effects can be obtained by applying the present invention to an electrode plate.
【００２３】（実施例２）正極用極板１の製造は実施例
１のベーマイト処理したアルミニウム箔の代わりに、あ
らかじめクロム酸化物層を表面に形成するクロメート処
理をしたアルミニウム箔を用いた以外は実施例１と同様
に行った。Example 2 A positive electrode plate 1 was manufactured in the same manner as in Example 1 except that a boehmite-treated aluminum foil was used instead of the boehmite-treated aluminum foil. Performed in the same manner as in Example 1.
【００２４】負極用極板２に用いる負極用ペーストの製
造は実施例１と同様に行った。得られた負極用ペースト
をダイコーターを用いて厚さ５０μｍの銅箔からなる負
極集電体の両面に塗布乾燥し、厚み０．２ｍｍに圧延
し、切断してシート状の負極用極板２を作製した。The production of the paste for the negative electrode used for the negative electrode plate 2 was carried out in the same manner as in Example 1. The obtained negative electrode paste was applied to both surfaces of a negative electrode current collector made of copper foil having a thickness of 50 μm using a die coater, dried, rolled to a thickness of 0.2 mm, cut, and cut into a sheet-shaped negative electrode plate 2. Was prepared.
【００２５】また、電解液は実施例１と同様のものを用
いた。The same electrolytic solution as in Example 1 was used.
【００２６】前記の正極用極板１を用いて実施例１と同
様に電池を作製し、そのサイクル特性を確認した。電池
は、直径１７ｍｍ，高さ５０ｍｍの寸法のものを作製し
た。Using the positive electrode plate 1 described above, a battery was fabricated in the same manner as in Example 1, and its cycle characteristics were confirmed. The battery had a size of 17 mm in diameter and 50 mm in height.
【００２７】また、比較例として、正極集電体の表面に
クロメート処理を行わず無処理である他は同じ製造方法
で作製した正極板を用いたリチウム二次電池と、本発明
の製造法により製造した正極板を備えたリチウム二次電
池のサイクル寿命特性を図３に示す。Also, as a comparative example, a lithium secondary battery using a positive electrode plate manufactured by the same manufacturing method except that the surface of the positive electrode current collector was not subjected to chromate treatment and was not treated, was prepared by the manufacturing method of the present invention. FIG. 3 shows the cycle life characteristics of the manufactured lithium secondary battery including the positive electrode plate.
【００２８】実施例１と同様に、充電は５００ｍＡの定
電流で行い４．１Ｖになった時点で４．１Ｖの定電圧充
電に切り換え、合計２時間充電を行った。放電は２０℃
７２０ｍＡで行い、放電電位が３．０Ｖになった時点で
放電を終了し次の充電を開始した。この図より本発明の
製造方法によるリチウム二次電池の正極用極板を備えた
電池は、従来の方法により製造したリチウム二次電池の
正極用極板を有する電池と比較して、充放電を繰り返し
ても容量の劣化が少なくサイクル特性に優れていること
がわかる。As in Example 1, charging was performed at a constant current of 500 mA, and when the voltage reached 4.1 V, switching to 4.1 V constant voltage charging was performed, and charging was performed for a total of 2 hours. Discharge is 20 ° C
The discharge was terminated at 720 mA, and the discharge was terminated when the discharge potential reached 3.0 V, and the next charge was started. From this figure, the battery provided with the positive electrode plate of the lithium secondary battery according to the manufacturing method of the present invention has a higher charge / discharge rate than the battery having the positive electrode plate of the lithium secondary battery manufactured by the conventional method. It can be seen that the capacity is less deteriorated even when repeated, and the cycle characteristics are excellent.
【００２９】これは、本発明の製造方法により得たリチ
ウム二次電池の正極用極板を備えた電池は、正極集電体
表面をクロメート処理を行うことで、クロメート処理し
た集電体表面の被膜は腐食するものの活物質を主成分と
する合剤層が集電体に直接には接しないため合剤層によ
る集電体の腐食を低減し、腐食反応時に界面付近で発生
する水素ガスの生成を抑制することができるので正極合
剤層と集電体との密着性が改良されたためで、これによ
り、充放電での正極合剤層の膨脹収縮によっても正極合
剤層が集電体から剥れ難くなったことが原因である。This is because the lithium secondary battery obtained by the production method of the present invention, provided with the positive electrode plate, performs the chromate treatment on the surface of the positive electrode current collector to obtain the surface of the chromate-treated current collector. Although the coating corrodes, the mixture layer mainly composed of the active material does not come into direct contact with the current collector, so that corrosion of the current collector by the mixture layer is reduced, and hydrogen gas generated near the interface during the corrosion reaction is reduced. Because the generation can be suppressed, the adhesiveness between the positive electrode mixture layer and the current collector has been improved, and thus, the positive electrode mixture layer can also be formed by the expansion and contraction of the positive electrode mixture layer during charging and discharging. This is due to the fact that it has become harder to peel off.
【００３０】また、正極集電体にアルミニウム箔を用い
るとクロメート処理により、表面が適度に腐食されるた
め、その結果、表面にアンカー効果を生じ正極合剤層と
の密着が格段に改良される。他方、集電体に鉄箔を用い
た場合にはクロメート処理によるアンカー効果は小さ
い。When an aluminum foil is used for the positive electrode current collector, the surface is appropriately corroded by the chromate treatment. As a result, an anchor effect is produced on the surface, and the adhesion to the positive electrode mixture layer is remarkably improved. . On the other hand, when an iron foil is used for the current collector, the anchor effect by the chromate treatment is small.
【００３１】これらの正極用極板を備えたリチウム二次
電池を充電状態で６０℃２０日間保存し、その後常温に
て数回充放電を行った後、７２０ｍＡで放電を行い電圧
が３．０Ｖに達するまでの容量を求め、その保存前の容
量に対する割合を（表２）に示した。The lithium secondary battery provided with these positive electrode plates was stored in a charged state at 60 ° C. for 20 days, and then charged and discharged several times at room temperature, and then discharged at 720 mA to obtain a voltage of 3.0 V. And the ratio to the capacity before storage is shown in (Table 2).
【００３２】[0032]
【表２】 [Table 2]
【００３３】（表２）に示すとおり、高温保存において
も本発明の製造方法により製造した正極用極板を備えた
リチウム二次電池は容量の劣化が少なくなることが明ら
かとなった。As shown in Table 2, it was found that the capacity of the lithium secondary battery provided with the positive electrode plate manufactured by the manufacturing method of the present invention was reduced even in high-temperature storage.
【００３４】[0034]
【発明の効果】以上説明したように本発明によれば、充
放電を繰り返して使用する際、充放電容量の劣化や保存
特性の劣化を極めて小さく抑えることができる。また、
高温下に長期間放置するような厳しい条件下においても
充放電容量の劣化を小さく抑えることができる。また、
電池組立工程中の極板の集電体からの活物質を主成分と
する合剤層の剥離が抑えられ、作業性を改善することが
できる。As described above, according to the present invention, when charge and discharge are repeatedly used, deterioration of charge and discharge capacity and deterioration of storage characteristics can be extremely suppressed. Also,
Even under severe conditions such as being left for a long time at a high temperature, deterioration of the charge / discharge capacity can be suppressed to a small level. Also,
During the battery assembly process, peeling of the mixture layer containing the active material as a main component from the current collector of the electrode plate is suppressed, and workability can be improved.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の一実施例による電池の断面図FIG. 1 is a cross-sectional view of a battery according to an embodiment of the present invention.
【図２】サイクル寿命特性を比較した図FIG. 2 is a diagram comparing cycle life characteristics.
【図３】サイクル寿命特性を比較した図FIG. 3 is a diagram comparing cycle life characteristics.
１ 正極用極板 ２ 負極用極板 ３ セパレータ ４ 電池ケース ５ 封口板 ６ ガスケット ７ 正極リード ８ 負極リード ９ 上部絶縁板 １０ 下部絶縁板 DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 Separator 4 Battery case 5 Sealing plate 6 Gasket 7 Positive electrode lead 8 Negative electrode lead 9 Upper insulating plate 10 Lower insulating plate
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浅野 英也 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 村井 祐之 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 松野 博 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 ──────────────────────────────────────────────────の Continued from the front page (72) Inventor Hideya Asano 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiroshi Matsuno 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (4)
面にベーマイト処理を施した集電体を用いたリチウム二
次電池。1. A lithium secondary battery in which at least one of a positive electrode plate and a negative electrode plate is provided with a current collector whose surface is subjected to boehmite treatment.
した被膜の厚みが０．５〜５μｍである請求項１記載の
リチウム二次電池。2. The lithium secondary battery according to claim 1, wherein the thickness of the coating formed on the surface of the current collector by the boehmite treatment is 0.5 to 5 μm.
た集電体を用いたリチウム二次電池。3. A lithium secondary battery using a current collector whose surface has been subjected to chromate treatment on a positive electrode plate.
んだペーストを塗布した後に乾燥して製造するリチウム
二次電池用正極板の製造方法において、前記するペース
トの塗布に先行して前記集電体の表面にあらかじめクロ
ム酸化物層を形成するクロメート処理をすることを特徴
とするリチウム二次電池用正極板の製造方法。4. A method for producing a positive electrode plate for a lithium secondary battery, comprising applying a paste containing an electrode active material to a current collector made of a metal foil and then drying the paste. A method for producing a positive electrode plate for a lithium secondary battery, wherein a chromate treatment for forming a chromium oxide layer on the surface of the current collector is performed in advance.
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| JP14991699A JP4250809B2 (en) | 1998-05-28 | 1999-05-28 | Lithium secondary battery and method of manufacturing positive electrode plate thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14711798 | 1998-05-28 | ||
| JP10-147117 | 1998-05-28 | ||
| JP14991699A JP4250809B2 (en) | 1998-05-28 | 1999-05-28 | Lithium secondary battery and method of manufacturing positive electrode plate thereof |
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| Publication Number | Publication Date |
|---|---|
| JP2000048822A true JP2000048822A (en) | 2000-02-18 |
| JP4250809B2 JP4250809B2 (en) | 2009-04-08 |
Family
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|---|---|---|---|
| JP14991699A Expired - Fee Related JP4250809B2 (en) | 1998-05-28 | 1999-05-28 | Lithium secondary battery and method of manufacturing positive electrode plate thereof |
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| Country | Link |
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| JP (1) | JP4250809B2 (en) |
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