JPH11339855A - Manufacture of nonaqueous electrolyte secondary battery - Google Patents
Manufacture of nonaqueous electrolyte secondary batteryInfo
- Publication number
- JPH11339855A JPH11339855A JP10148596A JP14859698A JPH11339855A JP H11339855 A JPH11339855 A JP H11339855A JP 10148596 A JP10148596 A JP 10148596A JP 14859698 A JP14859698 A JP 14859698A JP H11339855 A JPH11339855 A JP H11339855A
- Authority
- JP
- Japan
- Prior art keywords
- separator
- battery
- electrolyte
- wound
- positive electrode
- 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.)
- Pending
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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えばポータブル
機器の電源または大型大容量の電源として好適な非水電
解液二次電池の製造方法に関するものであり、詳しく
は、負極と正極とがセパレータを介して対向配置される
非水電解液二次電池の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a non-aqueous electrolyte secondary battery suitable for use as a power source for portable equipment or a large-capacity power source, for example. The present invention relates to a method for manufacturing a non-aqueous electrolyte secondary battery that is arranged to face the battery.
【０００２】[0002]
【従来の技術】近年、電子機器のポータブル化、コード
レス化が急速に進んでおり、これらの駆動用電源として
の小型・軽量で、高エネルギー密度を有する二次電池に
対する要望が高く、このような状況下では、非水電解液
二次電池、特にリチウム二次電池が、高電圧・高エネル
ギー密度を有する電池として期待が大きい。2. Description of the Related Art In recent years, portable and cordless electronic devices have been rapidly advancing, and there has been a high demand for a small and lightweight secondary battery having a high energy density as a power source for driving such electronic devices. Under these circumstances, non-aqueous electrolyte secondary batteries, especially lithium secondary batteries, are highly expected as batteries having high voltage and high energy density.
【０００３】そこで、最近ではリチウムやリチウム合
金、もしくは炭素材料のようなリチウムイオンをドープ
且つ脱ドープが可能な物質を負極として用い、また、正
極にリチウムコバルト酸化物等のリチウム複合酸化物を
使用する非水電解液二次電池であるリチウム二次電池の
研究、開発が盛んに行われている。該電池は電池電圧が
高く、高エネルギー密度を有し、自己放電も少なく、且
つ、サイクル特性にも優れている。Therefore, recently, a material capable of doping and undoping lithium ions such as lithium, a lithium alloy, or a carbon material is used as a negative electrode, and a lithium composite oxide such as lithium cobalt oxide is used as a positive electrode. Research and development of lithium secondary batteries, which are non-aqueous electrolyte secondary batteries, have been actively conducted. The battery has a high battery voltage, high energy density, low self-discharge, and excellent cycle characteristics.
【０００４】従来、該電池の工業的製造方法としては、
通常、負極活物質を含有する負極合剤が集電体表面に塗
布されてなる帯状負極と、正極活物質を含有する正極合
剤が集電体表面に塗布されてなる帯状正極とがセパレー
タを介して積層され、この積層体が渦巻状に捲回されて
なる捲回電極体を、電池缶に収納した後、非水電解液を
注入する方法が用いられている。[0004] Conventionally, the industrial production method of the battery includes:
Normally, a band-shaped negative electrode in which a negative electrode mixture containing a negative electrode active material is applied to the surface of a current collector, and a band-shaped positive electrode in which a positive electrode mixture containing a positive electrode active material is applied to the surface of a current collector form a separator. A method is used in which a wound electrode body formed by spirally winding the laminated body is housed in a battery can, and then a non-aqueous electrolyte is injected.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
製造方法では緻密に捲回された捲回電極体に対し、電解
液を注入する必要があるため、電解液注入時に吸引、加
圧、振動等の余分な操作が必要となったり、あるいは注
入に時間を要するため生産速度が上げられない、等の問
題がある。更に、上記操作により慎重に電解液注入を行
っても、電池内部への電解液の拡散が均一でない場合が
あり、これが電池の製造歩留を低下させる原因の一つと
なっている。However, in the conventional manufacturing method, it is necessary to inject an electrolytic solution into a densely wound electrode body. There is a problem that an extra operation is required, or the production speed cannot be increased due to the time required for injection. Furthermore, even if the electrolyte is carefully injected by the above operation, the diffusion of the electrolyte into the battery may not be uniform, which is one of the causes of lowering the production yield of the battery.
【０００６】[0006]
【課題を解決するための手段】上記課題に鑑み、本発明
者らは非水電解液二次電池の製造方法の改良を行った結
果、意外にも、比較的簡便な操作で上記課題が解決でき
電池の生産性が著しく向上できることを見いだし、本願
発明に到達した。即ち、本発明は、正極板、負極板とセ
パレータを捲回する際、予め電解液で含浸されたセパレ
ータを使用することを特徴とする非水電解液二次電池の
製造方法に存する。In view of the above problems, the present inventors have improved a method of manufacturing a non-aqueous electrolyte secondary battery. As a result, the present inventors have surprisingly solved the above problems with a relatively simple operation. It has been found that the productivity of the battery can be significantly improved, and the present invention has been achieved. That is, the present invention resides in a method for manufacturing a non-aqueous electrolyte secondary battery, wherein a separator pre-impregnated with an electrolytic solution is used when winding a positive electrode plate, a negative electrode plate and a separator.
【０００７】[0007]
【発明の実施の形態】以下本発明について詳細に説明す
る。本発明で用いる非水電解液や正極活物質、負極活物
質およびセパレータは電池の要求性能に応じて適宜選択
することが可能であり、以下、リチウム電池の場合を中
心として詳述する。本発明で用い得る非水電解液として
は、非水溶媒に電解質を溶解することにより調製され
る。この非水溶媒は、一般的にリチウム二次電池等に用
いられる有機溶媒を単独、または数種類を組み合わせた
ものであればよく、例えば、エチレンカーボネート（Ｅ
Ｃ）、プロピレンカーボネート（ＰＣ）、ブチレンカー
ボネート（ＢＣ）等の環状カーボネート類、ジメチルカ
ーボネート（ＤＭＣ）、ジエチルカーボネート（ＤＥ
Ｃ）、エチルメチルカーボネート（ＥＭＣ）等の鎖状カ
ーボネート類、プロピオン酸メチル、プロピオン酸エチ
ル等の脂肪族カルボン酸類が好適であり、環状カーボネ
ートと鎖状カーボネートとの混合系または環状カーボネ
ートと鎖状カーボネートおよび脂肪族カルボン酸エステ
ルとの混合系が特に好適である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The non-aqueous electrolyte, the positive electrode active material, the negative electrode active material, and the separator used in the present invention can be appropriately selected according to the required performance of the battery. Hereinafter, the lithium battery will be described in detail. The non-aqueous electrolyte that can be used in the present invention is prepared by dissolving an electrolyte in a non-aqueous solvent. The non-aqueous solvent may be an organic solvent generally used for a lithium secondary battery or the like, or may be a combination of several organic solvents. For example, ethylene carbonate (E
C), cyclic carbonates such as propylene carbonate (PC) and butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DE)
C), chain carbonates such as ethyl methyl carbonate (EMC), and aliphatic carboxylic acids such as methyl propionate and ethyl propionate are preferable, and a mixed system of a cyclic carbonate and a chain carbonate or a mixture of a cyclic carbonate and a chain Mixed systems with carbonates and aliphatic carboxylic esters are particularly preferred.
【０００８】上記の非水溶媒に溶解させる電解質として
は、例えば、過塩素酸リチウム（ＬｉＣｌＯ4）、六フ
ッ化燐酸リチウム（ＬｉＰＦ6）、ホウフッ化リチウム
（ＬｉＢＦ4）、六フッ化砒素リチウム（ＬｉＡｓ
Ｆ6）、トリフルオロメタンスルホン酸リチウム（Ｌｉ
ＣＦ3ＳＯ3）、ビストリフルオロメチルスルホニルイミ
ドリチウム〔ＬｉＮ（ＣＦ3ＳＯ2）2〕等のリチウム塩
を単独で、またはその数種類を組み合わせたものであれ
ばよく、六フッ化燐酸リチウム（ＬｉＰＦ6）が特に好
適である。かかる電解質の非水溶媒に対する溶解量は、
通常０．２〜２．０ｍｏｌ／ｌ、好ましくは０．５〜
１．５ｍｏｌ／ｌである。Examples of the electrolyte dissolved in the above non-aqueous solvent include lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ), lithium borofluoride (LiBF 4 ), and lithium arsenide hexafluoride (LiBF 4 ). LiAs
F 6 ), lithium trifluoromethanesulfonate (Li
Lithium salts such as CF 3 SO 3 ) and lithium bistrifluoromethylsulfonylimide [LiN (CF 3 SO 2 ) 2 ] may be used alone or in combination of several kinds thereof, and lithium hexafluorophosphate (LiPF 6 ) Are particularly preferred. The amount of such an electrolyte dissolved in a non-aqueous solvent is
Usually 0.2 to 2.0 mol / l, preferably 0.5 to 2.0 mol / l
1.5 mol / l.
【０００９】次に、本発明において用い得る正極活物質
としては、充電・放電時にリチウムを脱離・吸藏しうる
種々のリチウム含有遷移金属酸化物（例えば、ＬｉＭｎ
2Ｏ4等のリチウムマンガン複合酸化物、ＬｉＮｉＯ2等
のリチウム含有ニッケル酸化物、ＬｉＣｏＯ2等のリチ
ウム含有コバルト酸化物およびこれら酸化物のマンガ
ン、ニッケル、コバルトの一部を他の遷移金属などで置
換したもの、またはリチウムを含む酸化バナジウムな
ど）や、カルコゲン化合物（たとえば二酸化マンガン、
二硫化チタン、二硫化モリブデンなど）等を挙げること
ができるが、中でもリチウム含有遷移金属酸化物を用い
ることが好ましい。また、正極には人造黒鉛、カーボン
ブラック（たとえばアセチレンブラックなど）またはニ
ッケル粉末等を導電性材料として用いることができる。Next, as the positive electrode active material that can be used in the present invention, various lithium-containing transition metal oxides (for example, LiMn) capable of desorbing and occluding lithium during charging and discharging are used.
Lithium-manganese composite oxides such as 2 O 4 , lithium-containing nickel oxides such as LiNiO 2 , lithium-containing cobalt oxides such as LiCoO 2, and part of manganese, nickel, and cobalt in these oxides are replaced with other transition metals Or chalcogen compounds (such as manganese dioxide,
Titanium disulfide, molybdenum disulfide, and the like), and among them, a transition metal oxide containing lithium is preferably used. For the positive electrode, artificial graphite, carbon black (eg, acetylene black), nickel powder, or the like can be used as a conductive material.
【００１０】本発明において用い得る負極活物質として
は、リチウムやリチウム合金、もしくは炭素材料のよう
なリチウムイオンをドープ且つ脱ドープが可能な物質が
挙げられ、例えば、人造黒鉛、天然黒鉛などの黒鉛材
料、ハードカーボン等が好適である。本発明において用
い得るセパレータ材料としては、非水電解液二次電池用
セパレータとして公知の材料を用いることが可能であ
る。中でもポリオレフィン微多孔フィルム、特にポリエ
チレン製微多孔フィルムが好適である。Examples of the negative electrode active material that can be used in the present invention include materials that can be doped and de-doped with lithium ions such as lithium, lithium alloys, and carbon materials. Examples thereof include graphite such as artificial graphite and natural graphite. Materials, hard carbon and the like are preferred. As a separator material that can be used in the present invention, a material known as a separator for a non-aqueous electrolyte secondary battery can be used. Among them, a polyolefin microporous film, particularly a polyethylene microporous film is preferable.
【００１１】本発明の製造方法を適用し得る非水電解液
二次電池の形状としては、負極と正極とがセパレータを
介して対向配置し、かつ、捲回電極体を形成するもので
あれば、いずれの形状の電池にも適用可能である。捲回
電極体を形成する電池の例としては、円筒形電池は言う
までもなく、角形電池に代表される、楕円状あるいは扁
平の捲回電極体電池も含まれる。また、本発明の製造方
法は、電池の大きさによらず適用可能であり、例えば、
ポータブル機器の電源に用いるような小型電池、または
電気自動車の電源に用いるような大型電池、いずれに対
しても効果的である。The shape of the nonaqueous electrolyte secondary battery to which the manufacturing method of the present invention can be applied is such that the negative electrode and the positive electrode are opposed to each other with a separator therebetween and form a wound electrode body. The present invention is applicable to batteries of any shape. Examples of the battery forming the wound electrode body include not only a cylindrical battery but also an elliptical or flat wound electrode body battery typified by a square battery. Further, the manufacturing method of the present invention is applicable regardless of the size of the battery, for example,
It is effective for a small battery used for a power source of a portable device or a large battery used for a power source of an electric vehicle.
【００１２】以上のような電池材料を組み合わせて電池
を製造する場合における本発明の特徴は、正極板、負極
板とセパレータを捲回する際、予め電解液で含浸された
セパレータを用いることにある。セパレータに対し電解
液を予め含浸しておく方法としては、第一には、単体の
セパレータフィルムに対し、電解液を含浸させ、その
後、正極板、負極板とともに捲回する方法が考えられ
る。また、大量生産に適した方法としては、捲回装置を
用いて正極板、負極板とセパレータを捲回する方法が適
しているが、この際、該捲回装置の捲回部の手前に電解
液槽を設け、セパレータを予め電解液に連続的に含浸さ
せて捲回していく方法は効率的であり、特に好ましい方
法である。なお、捲回された電極体を電池缶に収納した
後に、補助的に電池缶に更に電解液を注入することも可
能である。しかしながら、本発明の目的達成のために
は、電極体を電池缶に収納した後に追加される電解液の
補充量は、最終的な電池中の電解液総量の通常半分以下
とすることが好ましい。A feature of the present invention when a battery is manufactured by combining the above battery materials is that a separator pre-impregnated with an electrolytic solution is used when the positive electrode plate, the negative electrode plate and the separator are wound. . As a method of previously impregnating the separator with the electrolytic solution, first, a method of impregnating the electrolytic solution into a single separator film and then winding the separator film together with the positive electrode plate and the negative electrode plate can be considered. Further, as a method suitable for mass production, a method of winding a positive electrode plate, a negative electrode plate and a separator using a winding device is suitable. In this case, an electrolytic solution is provided before the winding portion of the winding device. A method in which a liquid tank is provided and the separator is continuously impregnated with the electrolytic solution in advance and wound is an efficient and particularly preferable method. After the wound electrode body is stored in the battery can, it is also possible to additionally inject an electrolytic solution into the battery can. However, in order to achieve the object of the present invention, it is preferable that the replenishment amount of the electrolyte solution added after the electrode body is housed in the battery can be usually half or less of the total electrolyte solution in the final battery.
【００１３】[0013]
【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明するが、本発明はその要旨を超えない限
り以下の実施例に限定をされるものではない。 実施例 ＬｉＣｏＯ2を活物質として、これに導電剤としてアセ
チレンブラックを混合した後、結着剤としてポリ四フッ
化エチレン樹脂の水性ディスパージョンを練合してペー
スト状とした合剤を、アルミニウム箔に塗布し、プレス
加工した正極と、グラファイトを活物質とし、結着剤と
してスチレンブタジエンゴムを混合した後、カルボキシ
メチルセルロース水溶液に懸濁させてペースト状とした
合剤を、銅箔に塗布し、プレス加工した負極とをセパレ
ータであるポリエチレン製多孔質膜を介して捲回、捲回
電極体を作成した。このとき、捲回装置の捲回部直前に
電解液槽を設け、セパレータに非水電解液を含浸させな
がら捲回を行った。電解液にはエチレンカーボネート
（ＥＣ）とジメチルカーボネート（ＤＭＣ）を体積比で
１：１で混合し、１ｍｏｌ／ｌの六フッ化リン酸リチウ
ム（ＬｉＰＦ6）を溶解させたものを用いた。得られた
捲回電極体を電池缶に収納、正極および負極を接続した
後、電池缶を封止し、１００個の電池を製作した。得ら
れた電池の放電容量を測定し、容量値が平均容量よりも
１０％以上低いものを不良とし、検査したところ、不良
は認められなかった。 比較例 公知の常法に基づき、正極、負極と電解液が含浸されて
いないセパレータの捲回電極体を電池缶に収納した後、
電解液を注入した以外は、実施例と同様にして、電池１
００個を製作した。実施例と同様の方法により、電池の
品質検査をしたところ、１０個の不良が認められた。EXAMPLES The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the following examples unless it exceeds the gist. Example After mixing LiCoO 2 as an active material, acetylene black as a conductive agent and kneading an aqueous dispersion of a polytetrafluoroethylene resin as a binder, the mixture was formed into an aluminum foil. The positive electrode pressed and pressed, graphite was used as the active material, and styrene-butadiene rubber was mixed as a binder, and then the mixture was suspended in an aqueous solution of carboxymethylcellulose and applied as a paste to a copper foil. The pressed negative electrode was wound through a polyethylene porous membrane serving as a separator to form a wound electrode body. At this time, an electrolytic solution tank was provided immediately before the winding section of the winding device, and the winding was performed while the separator was impregnated with the nonaqueous electrolytic solution. The electrolytic solution used was a mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC) at a volume ratio of 1: 1 and 1 mol / l of lithium hexafluorophosphate (LiPF 6 ) dissolved therein. After storing the obtained wound electrode body in a battery can and connecting the positive electrode and the negative electrode, the battery can was sealed and 100 batteries were manufactured. The discharge capacity of the obtained battery was measured, and a battery having a capacity value lower than the average capacity by 10% or more was determined to be defective. As a result, no defect was recognized. Comparative Example Based on a well-known conventional method, the positive electrode, the negative electrode and the wound electrode body of the separator not impregnated with the electrolytic solution were stored in the battery can,
Battery 1 was prepared in the same manner as in Example except that the electrolyte was injected.
00 pieces were produced. When the quality of the battery was inspected by the same method as in the example, ten defects were found.
【００１４】[0014]
【発明の効果】本発明によれば、電池の生産速度を向上
させることができる。また、製造された製品の均質性が
向上できる。従って、生産性および歩留の優れた非水電
解液二次電池を大量生産が可能となる。According to the present invention, the production speed of a battery can be improved. Further, the homogeneity of the manufactured product can be improved. Therefore, it is possible to mass-produce non-aqueous electrolyte secondary batteries having excellent productivity and yield.
Claims (3)
際、予め電解液で含浸されたセパレータを使用すること
を特徴とする非水電解液二次電池の製造方法。1. A method for producing a non-aqueous electrolyte secondary battery, comprising: using a separator pre-impregnated with an electrolyte when winding the positive electrode plate, the negative electrode plate and the separator.
レータを捲回する際、該捲回装置の捲回部の手前に電解
液槽を設け、セパレータを予め電解液に連続的に含浸さ
せて捲回することを特徴とする請求項１に記載の非水電
解液二次電池の製造方法。2. When winding a positive electrode plate, a negative electrode plate and a separator using a winding device, an electrolytic solution tank is provided in front of a winding portion of the winding device, and the separator is continuously immersed in the electrolytic solution in advance. The method for producing a non-aqueous electrolyte secondary battery according to claim 1, wherein the non-aqueous electrolyte secondary battery is impregnated and wound.
する請求項１又は２に記載の非水電解液二次電池の製造
方法。3. The method for producing a non-aqueous electrolyte secondary battery according to claim 1, wherein the battery is a lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10148596A JPH11339855A (en) | 1998-05-29 | 1998-05-29 | Manufacture of nonaqueous electrolyte secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10148596A JPH11339855A (en) | 1998-05-29 | 1998-05-29 | Manufacture of nonaqueous electrolyte secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11339855A true JPH11339855A (en) | 1999-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10148596A Pending JPH11339855A (en) | 1998-05-29 | 1998-05-29 | Manufacture of nonaqueous electrolyte secondary battery |
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| Country | Link |
|---|---|
| JP (1) | JPH11339855A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4002535A1 (en) | 2020-11-16 | 2022-05-25 | Prime Planet Energy & Solutions, Inc. | Method for producing nonaqueous electrolyte secondary battery |
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1998
- 1998-05-29 JP JP10148596A patent/JPH11339855A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4002535A1 (en) | 2020-11-16 | 2022-05-25 | Prime Planet Energy & Solutions, Inc. | Method for producing nonaqueous electrolyte secondary battery |
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