JPH11204136A - Bipolar-type lithium-ion secondary battery and manufacture thereof - Google Patents
Bipolar-type lithium-ion secondary battery and manufacture thereofInfo
- Publication number
- JPH11204136A JPH11204136A JP10002545A JP254598A JPH11204136A JP H11204136 A JPH11204136 A JP H11204136A JP 10002545 A JP10002545 A JP 10002545A JP 254598 A JP254598 A JP 254598A JP H11204136 A JPH11204136 A JP H11204136A
- Authority
- JP
- Japan
- Prior art keywords
- secondary battery
- ion secondary
- battery
- negative electrode
- 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)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、バイポーラ型リチ
ウムイオン2次電池の構造の改良及びそのための製造方
法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the structure of a bipolar lithium ion secondary battery and an improvement in a manufacturing method therefor.
【0002】[0002]
【従来の技術】従来、バイポーラ型リチウムイオン2次
電池は、集電箔上の片面に負極を設け、他の片面に正極
を設けたものを電解質・セパレータを介して積層するこ
とにより製造していた。2. Description of the Related Art Hitherto, a bipolar type lithium ion secondary battery has been manufactured by providing a negative electrode on one side of a current collector foil and laminating a positive electrode on the other side via an electrolyte / separator. Was.
【0003】実開平4−54148号公報には、このよ
うな構造の電池が開示されている。図2には、本従来例
の電池の断面図が示される。図2において、銅板100
a,100bの間に、複数個の基板102が、電解質1
04を介して積層されている。この基板102は、ステ
ンレス薄板等よりなる導電性の基板本体106を隔壁と
して、その一側面側に正極活物質108を、他側面側に
負極活物質110をそれぞれ付着している。[0003] Japanese Utility Model Application Laid-Open No. 4-54148 discloses a battery having such a structure. FIG. 2 shows a cross-sectional view of the battery of the conventional example. In FIG. 2, the copper plate 100
a, 100b, a plurality of substrates 102
04 are interposed. The substrate 102 has a conductive substrate body 106 made of a stainless steel thin plate or the like as a partition wall, and a positive electrode active material 108 is adhered on one side and a negative electrode active material 110 is adhered on the other side.
【0004】[0004]
【発明が解決しようとする課題】しかし、上記従来例に
おいては、各電池の単位、すなわち電解質104を挟ん
だ正極活物質108、負極活物質110を独立して形成
することができない。このため、電池全体に電圧を印可
した場合の合計電圧しか測定できず、個々の電池単位ご
とに実際に加わる電圧が測定できない。従って、製造時
に不良な電池単位が存在してもチェックできず、使用中
その部分に電圧が集中し、破損の恐れが大きくなるとい
う問題があった。However, in the above conventional example, the unit of each battery, that is, the positive electrode active material 108 and the negative electrode active material 110 sandwiching the electrolyte 104 cannot be formed independently. Therefore, only the total voltage when the voltage is applied to the entire battery can be measured, and the voltage actually applied to each individual battery unit cannot be measured. Therefore, even if there is a defective battery unit at the time of manufacture, it cannot be checked, and there is a problem that the voltage is concentrated on that portion during use and the possibility of damage increases.
【0005】本発明は、上記従来の課題に鑑みなされた
ものであり、その目的は、各電池単位ごとに電圧チェッ
ク、容量チェックが行える構造のバイポーラ型リチウム
イオン2次電池及びその製造方法を提供することにあ
る。The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a bipolar lithium ion secondary battery having a structure in which a voltage check and a capacity check can be performed for each battery unit, and a method of manufacturing the same. Is to do.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、バイポーラ型リチウムイオン2次電池で
あって、ゲル電解質が含浸されたセパレータの両面にそ
れぞれ正極と負極とが形成された電池単位が複数個積層
された構造を有することを特徴とする。In order to achieve the above object, the present invention relates to a bipolar type lithium ion secondary battery in which a positive electrode and a negative electrode are formed on both surfaces of a separator impregnated with a gel electrolyte. Characterized in that it has a structure in which a plurality of battery units are stacked.
【0007】また、上記バイポーラ型リチウムイオン2
次電池の製造方法であって、通気性を有するセパレータ
を正極材と負極材とで挟む工程と、この挟まれたセパレ
ータに電解質が溶解した電解液と樹脂との混合液を含浸
する工程と、このセパレータを加熱し、その後冷却する
ことにより、含浸された混合液をゲル化する工程と、に
より電池単位を形成し、これを積層することを特徴とす
る。The bipolar type lithium ion 2
The following method for producing a battery, a step of sandwiching a separator having air permeability between a positive electrode material and a negative electrode material, and a step of impregnating a mixed solution of an electrolyte solution and a resin in which the electrolyte is dissolved in the sandwiched separator, By heating the separator and then cooling it, a step of gelling the impregnated mixed solution is performed, thereby forming a battery unit and laminating the battery units.
【0008】[0008]
【発明の実施の形態】以下、本発明の実施の形態(以下
実施形態という)を、図面に従って説明する。Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.
【0009】図1には、本発明に係るバイポーラ型リチ
ウムイオン2次電池の構成図が示される。図1におい
て、ゲル電解質が含浸されたセパレータ10の両面にそ
れぞれ正極12及び負極14が形成された電池単位が、
集電箔16を介して複数個積層されている。このような
積層体が、正極側及び負極側の集電箔18、20によっ
て挟まれ、バイポーラ型リチウムイオン2次電池が構成
されている。FIG. 1 shows a configuration diagram of a bipolar type lithium ion secondary battery according to the present invention. In FIG. 1, a battery unit in which a positive electrode 12 and a negative electrode 14 are formed on both surfaces of a separator 10 impregnated with a gel electrolyte,
Plural pieces are laminated via the current collector foil 16. Such a laminated body is sandwiched between the current collector foils 18 and 20 on the positive electrode side and the negative electrode side, thereby forming a bipolar lithium ion secondary battery.
【0010】上述の正極12は、例えばアルミニウム箔
上に、LiMn2O4のような活物質をその片面のみに塗
布し乾燥させたものである。また負極14は、例えば銅
上に黒鉛のような活物質をその片面のみに塗布し乾燥さ
せたものである。上記電池単位は、正極12の活物質側
と負極14の活物質側とを対向させ、セパレータ10を
挟んで形成されている。The above-described positive electrode 12 is obtained by applying an active material such as LiMn 2 O 4 on only one surface thereof on an aluminum foil and drying it. The negative electrode 14 is obtained by, for example, applying an active material such as graphite on copper only on one side thereof and drying it. The above-mentioned battery unit is formed with the active material side of the positive electrode 12 and the active material side of the negative electrode 14 facing each other, with the separator 10 interposed therebetween.
【0011】また、集電箔16としては、例えばニッケ
ル(Ni)、アルミニウム(Al)、銅(Cu)、ステ
ンレス(SUS)等が使用される。この集電箔16は、
その周囲は例えばポリエチレン(PE)、ポリプロピレ
ン(PP)、ポリテトラフルオラエチレン(PTFE)
のような絶縁物22によって覆われている。これによ
り、厚さの極めて薄い電池単位を、集電箔16を介して
積層していく場合の、各電極間の短絡を防止することが
できる。As the current collecting foil 16, for example, nickel (Ni), aluminum (Al), copper (Cu), stainless steel (SUS), or the like is used. This current collector foil 16
The surrounding area is, for example, polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE)
Is covered with an insulator 22 as shown in FIG. Thereby, a short circuit between the electrodes can be prevented when the battery units having an extremely small thickness are stacked via the current collector foil 16.
【0012】また、正極側集電箔18としてはアルミニ
ウム等が使用され、負極側集電箔20としては銅等が使
用されている。正極側集電箔18と負極側集電箔20と
の間に、複数の電池単位が積層されているので、電池の
直列接続となり、各電池単位の電位の合計分だけの起電
力を有するバイポーラ型リチウムイオン2次電池を構成
することができる。Aluminum or the like is used for the positive electrode side current collector foil 18, and copper or the like is used for the negative electrode side current collector foil 20. Since a plurality of battery units are stacked between the positive electrode side current collector foil 18 and the negative electrode side current collector foil 20, the batteries are connected in series, and the bipolar unit has an electromotive force corresponding to the total potential of each battery unit. Type lithium ion secondary battery.
【0013】なお、図1に示された例では、各電極及び
集電箔が矩形状をなしているが、これを円筒形状とする
ことも好適である。In the example shown in FIG. 1, each of the electrodes and the current collector foil has a rectangular shape. However, it is also preferable that the electrodes and the current collector foil have a cylindrical shape.
【0014】次に、上記バイポーラ型リチウムイオン2
次電池の製造方法について説明する。Next, the bipolar type lithium ion 2
Next, a method for manufacturing a secondary battery will be described.
【0015】正極12及び負極14については、前述し
たように、アルミニウム箔上(正極)あるいは銅上(負
極)に各活物質を塗布し乾燥させることにより製造す
る。As described above, the positive electrode 12 and the negative electrode 14 are manufactured by applying and drying each active material on aluminum foil (positive electrode) or copper (negative electrode).
【0016】また、この正極12及び負極14の各活物
質側を対向配置し、ゲル電解質が含浸されたセパレータ
10を挟み込んで電池単位とするが、これは以下の工程
により製造する。すなわち、正極12及び負極14の各
活物質を対向させ、通気性を有するセパレータとして不
織布をその間に挟み込む。これを、LiPF6電解質を
含むEC:DEC=1:1の電解液に、PVDF−HF
P樹脂を15%分散させた混合液の中に浸漬する。この
PVDF−HFPの代わりに、アクリルやPAN等の樹
脂を使用することもできる。また、電解質としては、L
iPF6のほかにLiBF4等も使用することができる。
また、電解質を溶解する溶液としては、PC等も使用す
ることができる。上記電解質が溶解した電解液と樹脂と
の混合液は、まだゲル状になっていないので、この工程
により、不織布中に浸透していく。The active material sides of the positive electrode 12 and the negative electrode 14 are arranged to face each other, and the separator 10 impregnated with the gel electrolyte is interposed therebetween to form a battery unit. This is manufactured by the following steps. That is, the respective active materials of the positive electrode 12 and the negative electrode 14 are opposed to each other, and a nonwoven fabric is interposed therebetween as a gas-permeable separator. This was mixed with an electrolyte solution of EC: DEC = 1: 1 containing LiPF 6 electrolyte by PVDF-HF.
The resin is immersed in a mixture in which 15% of the P resin is dispersed. Instead of the PVDF-HFP, a resin such as acrylic or PAN can be used. As the electrolyte, L
LiBF 4 and the like can be used in addition to iPF 6 .
In addition, as the solution for dissolving the electrolyte, PC or the like can also be used. Since the mixed solution of the electrolyte solution in which the electrolyte is dissolved and the resin is not yet in a gel state, this process permeates the nonwoven fabric.
【0017】以上のように、上記混合液中に上述した電
池単位を浸漬した後、120℃の温度に加熱する。加熱
後、混合液中から電池単位を取り出し、室温に冷却し、
不織布中に含浸された混合液をゲル化する。この工程に
より、ゲル電解質が含浸されたセパレータ10の両面に
正極12及び負極14が形成された電池単位を得ること
ができる。As described above, after the above-mentioned battery unit is immersed in the above-mentioned mixed solution, it is heated to a temperature of 120 ° C. After heating, remove the battery unit from the mixture, cool to room temperature,
The mixed solution impregnated in the nonwoven fabric is gelled. According to this step, a battery unit in which the positive electrode 12 and the negative electrode 14 are formed on both surfaces of the separator 10 impregnated with the gel electrolyte can be obtained.
【0018】以上のように構成した電池単位の短絡や容
量及び電圧のチェックをした後、この電池単位を、P
E、PP、PTFE等の絶縁体で周囲を囲んだステンレ
ス箔等の集電箔16を介して積層し、バイポーラ電池を
得ることができる。なお、積層物を固定するため、P
E、PPが溶解する温度でホットプレスすることも好適
である。あるいは、全体をモールディングすることも好
適である。After checking the short circuit and the capacity and voltage of the battery unit configured as described above, this battery unit is
A bipolar battery can be obtained by laminating via a current collector foil 16 such as a stainless steel foil surrounded by an insulator such as E, PP, or PTFE. In order to fix the laminate, P
It is also preferable to perform hot pressing at a temperature at which E and PP dissolve. Alternatively, it is also preferable to mold the whole.
【0019】上述したように電解質が溶解した電解液の
中に、PVDF−HFP等の樹脂を混合するのは、電解
液のみでは、不織布中に電解液を保持するのが難しく、
また充放電によりLiデンドライトが発生しやすいため
である。これに対し、樹脂を混合しゲル化させると、粒
界の発生を防止でき、抵抗の増加を抑制できる。As described above, when a resin such as PVDF-HFP is mixed with the electrolyte in which the electrolyte is dissolved, it is difficult to hold the electrolyte in the nonwoven fabric by using only the electrolyte.
Another reason is that Li dendrite is easily generated by charge and discharge. On the other hand, when the resin is mixed and gelled, generation of grain boundaries can be prevented, and an increase in resistance can be suppressed.
【0020】本発明においては、バイポーラ型リチウム
イオン2次電池を製造する際に、各電池単位すなわち正
極12、負極14及びセパレータ10からなる電池単位
を形成し、この電池単位を積層していくという手順とな
る。従って、製造時にこの電池単位毎にその電圧チェッ
ク及び容量チェックを行うことができる。このため、製
造時に不良な電池単位が存在した場合には、これを取り
除くことができる。この結果、使用中にその不良な電池
単位部分に電圧が集中し、破損することを防止すること
ができる。In the present invention, when manufacturing a bipolar type lithium ion secondary battery, each battery unit, that is, a battery unit including the positive electrode 12, the negative electrode 14, and the separator 10 is formed, and the battery units are laminated. Procedure. Therefore, the voltage check and the capacity check can be performed for each battery unit during manufacturing. Therefore, if a defective battery unit is present during manufacturing, it can be removed. As a result, it is possible to prevent the voltage from being concentrated on the defective battery unit during use and from being damaged.
【0021】以上のようにして構成した本発明に係るバ
イポーラ型リチウムイオン2次電池の充放電試験を実施
したところ、電池単位を2層積層した場合に、0.5m
A/cm2の充放電電流で、3.2時間充電し、2.6
時間放電した場合に(6−8.5V間)、100サイク
ル後も初期の85%の容量を得ることができた。これに
より耐久性のよいバイポーラ型リチウムイオン2次電池
が得られていることが確認された。A charge / discharge test of the bipolar lithium-ion secondary battery according to the present invention constructed as described above was carried out.
Charged for 3.2 hours at a charge / discharge current of A / cm 2 , 2.6
When the battery was discharged for a period of time (between 6 and 8.5 V), 85% of the initial capacity was obtained after 100 cycles. As a result, it was confirmed that a bipolar lithium ion secondary battery having good durability was obtained.
【0022】[0022]
【発明の効果】以上説明したように、本発明によれば、
ゲル電解質が含浸されたセパレータの両面に正極と負極
とが形成された電池単位を製造し、これを積層するの
で、製造時に電池単位毎に電圧チェック及び容量チェッ
クを行うことができる。この結果、バイポーラ型リチウ
ムイオン2次電池の製造時に不良な電池単位を排除する
ことができ、不良な電池単位に電圧が集中して破損する
ことを防止することができる。As described above, according to the present invention,
Since a battery unit in which a positive electrode and a negative electrode are formed on both surfaces of a separator impregnated with a gel electrolyte is manufactured and laminated, a voltage check and a capacity check can be performed for each battery unit during manufacturing. As a result, defective battery units can be eliminated during the manufacture of the bipolar lithium-ion secondary battery, and it is possible to prevent voltage from being concentrated on the defective battery units and causing damage.
【図1】 本発明に係るバイポーラ型リチウムイオン2
次電池の構成図である。FIG. 1 shows a bipolar lithium ion 2 according to the present invention.
It is a block diagram of a secondary battery.
【図2】 従来におけるバイポーラ型リチウムイオン2
次電池の構成の断面図である。FIG. 2 shows a conventional bipolar type lithium ion 2
It is sectional drawing of a structure of a secondary battery.
10 セパレータ、12 正極、14 負極、16 集
電箔、18 正極側集電箔、20 負極側集電箔、22
絶縁物、100a,100b 銅板、102基板、1
04 電解質、106 基板本体、108 正極活物
質、110 負極活物質。Reference Signs List 10 separator, 12 positive electrode, 14 negative electrode, 16 current collector foil, 18 positive electrode side current collector foil, 20 negative electrode side current collector foil, 22
Insulator, 100a, 100b Copper plate, 102 substrate, 1
04 electrolyte, 106 substrate body, 108 positive electrode active material, 110 negative electrode active material.
Claims (2)
面にそれぞれ正極と負極とが形成された電池単位が複数
個積層された構造を有することを特徴とするバイポーラ
型リチウムイオン2次電池。1. A bipolar lithium ion secondary battery having a structure in which a plurality of battery units each having a positive electrode and a negative electrode formed on both surfaces of a separator impregnated with a gel electrolyte are stacked.
オン2次電池の製造方法であって、 通気性を有するセパレータを正極材と負極材とで挟む工
程と、前記挟まれたセパレータに電解質が溶解した電解
液と樹脂との混合液を含浸する工程と、このセパレータ
を加熱し、その後冷却することにより、前記含浸された
混合液をゲル化する工程と、により前記セルを形成し、
これを積層することを特徴とするバイポーラ型リチウム
イオン2次電池の製造方法。2. The method for manufacturing a bipolar lithium ion secondary battery according to claim 1, wherein a separator having air permeability is sandwiched between a positive electrode material and a negative electrode material, and an electrolyte is dissolved in the sandwiched separator. Step of impregnating the mixed solution of the electrolyte solution and the resin, and heating the separator, and then cooling, by gelling the impregnated mixed solution, the cells are formed,
A method for manufacturing a bipolar lithium-ion secondary battery, comprising laminating them.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10002545A JPH11204136A (en) | 1998-01-08 | 1998-01-08 | Bipolar-type lithium-ion secondary battery and manufacture thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10002545A JPH11204136A (en) | 1998-01-08 | 1998-01-08 | Bipolar-type lithium-ion secondary battery and manufacture thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11204136A true JPH11204136A (en) | 1999-07-30 |
Family
ID=11532362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10002545A Pending JPH11204136A (en) | 1998-01-08 | 1998-01-08 | Bipolar-type lithium-ion secondary battery and manufacture thereof |
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JP (1) | JPH11204136A (en) |
Cited By (34)
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JP2000030747A (en) * | 1998-07-10 | 2000-01-28 | Mitsubishi Chemicals Corp | Manufacture of stacked type secondary battery |
JP2001052745A (en) * | 1999-08-04 | 2001-02-23 | Sony Corp | Nonaqueous gel secondary battery and its manufacture |
JP2001068165A (en) * | 1999-08-26 | 2001-03-16 | Sony Corp | Nonaqueous system polymer secondary battery |
JP2001283914A (en) * | 2000-03-30 | 2001-10-12 | Matsushita Electric Ind Co Ltd | Manufacturing method of lithium polymer battery |
JP2004503913A (en) * | 2000-06-15 | 2004-02-05 | エイイーエイ テクノロジー バッテリー システムズ リミテッド | Battery incorporating a porous membrane |
JP2004134116A (en) * | 2002-10-08 | 2004-04-30 | Nissan Motor Co Ltd | Bipolar battery |
EP1418638A2 (en) * | 2002-11-07 | 2004-05-12 | Nissan Motor Co., Ltd. | Bipolar battery |
JP2004143363A (en) * | 2002-10-28 | 2004-05-20 | Nitto Denko Corp | Porous film supporting adhesive/gelling agent and use thereof |
JP2004158307A (en) * | 2002-11-06 | 2004-06-03 | Nissan Motor Co Ltd | Bipolar battery |
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