JP2002075456A - Nonaqueous electrolyte cell - Google Patents
Nonaqueous electrolyte cellInfo
- Publication number
- JP2002075456A JP2002075456A JP2000261724A JP2000261724A JP2002075456A JP 2002075456 A JP2002075456 A JP 2002075456A JP 2000261724 A JP2000261724 A JP 2000261724A JP 2000261724 A JP2000261724 A JP 2000261724A JP 2002075456 A JP2002075456 A JP 2002075456A
- Authority
- JP
- Japan
- Prior art keywords
- current collector
- negative electrode
- positive electrode
- active material
- electrode active
- 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
- 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、正極活物質と負極
活物質とが、セパレータを介して巻回される構造の発電
要素を備えた非水電解質電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonaqueous electrolyte battery provided with a power generating element having a structure in which a positive electrode active material and a negative electrode active material are wound via a separator.
【０００２】[0002]
【従来の技術】近年、コバルト酸リチウム、マンガン酸
リチウム、ニッケル酸リチウム等を正極活物質とする一
方、リチウムイオンを吸蔵、放出し得る炭素材料等を負
極活物質とする非水電解質電池が、注目されている。2. Description of the Related Art In recent years, nonaqueous electrolyte batteries using lithium cobaltate, lithium manganate, lithium nickelate or the like as a positive electrode active material and a carbon material or the like capable of occluding and releasing lithium ions as a negative electrode active material have been developed. Attention has been paid.
【０００３】従来、上記非水電解質電池においては、ア
ルミニウム箔から成る正極集電体の両面に正極活物質を
塗着した正極と、銅箔から成る負極集電体の両面に負極
活物質を塗着した負極とを、セパレータを介して巻回し
た発電要素を外装体内に収納する構造が一般的である。
ここで、上記両集電体は両活物質から集電することを目
的としており、電池反応には直接寄与するものではない
ため、集電能力を十分に確保できる範囲で薄くし、体積
エネルギー密度や重量エネルギー密度の向上を図ること
が望ましい。Conventionally, in the above nonaqueous electrolyte battery, a positive electrode in which a positive electrode active material is coated on both surfaces of a positive electrode current collector made of aluminum foil, and a negative electrode active material is coated on both surfaces of a negative electrode current collector made of copper foil. In general, a structure in which the attached negative electrode and a power generation element wound around a separator are housed in an exterior body.
Here, the two current collectors are intended to collect current from both active materials, and do not directly contribute to the battery reaction. It is desirable to improve the weight and energy density.
【０００４】ところが、上記正負両極とセパレータとを
巻回する際には、ロール巻き取り方式により連続的に行
われるため、正極集電体と負極集電体とには十分な強度
（引っ張り強度、曲げ強度等）が要求され、このため、
強度面から両集電体を薄くすることが出来ないのが現状
である。この結果、体積エネルギー密度や重量エネルギ
ー密度を向上させることができないという課題を有して
いた。However, since the winding of the positive and negative electrodes and the separator is performed continuously by a roll winding method, the positive electrode current collector and the negative electrode current collector have sufficient strength (tensile strength, Bending strength).
At present, both current collectors cannot be made thin from the viewpoint of strength. As a result, there is a problem that the volume energy density and the weight energy density cannot be improved.
【０００５】また、非水電解質電池においては、リチウ
ムのデンドライド析出という問題があるが、この問題を
解決するには、正極活物質が存在する対向位置には必ず
負極活物質が存在しなければならず、このため、負極活
物質層の長さを正極活物質層の長さよりも大きくする必
要がある。この場合、図６に示すように、正極集電体５
０の両面に正極活物質５１・５２が塗着されているた
め、巻回時に、正極活物質５１とこの正極活物質５１に
対応する負極活物質５３との位置ずれ、及び、正極活物
質５２とこの正極活物質５２に対応する負極活物質５４
との位置ずれを考慮して、負極活物質５３・５４の過剰
分５５（正極活物質５１・５２からはみ出た部分）を長
くしなければならない。更に、正極活物質５１・５２と
負極活物質５３・５４との位置ずれを考慮して、セパレ
ータ５７の巻回方向の長さを大きくしなければならな
い。これらのことによっても、体積エネルギー密度や重
量エネルギー密度が低下するという課題を有していた。[0005] Further, in the nonaqueous electrolyte battery, there is a problem of dendritic deposition of lithium. To solve this problem, the negative electrode active material must be present at a position facing the positive electrode active material. Therefore, it is necessary to make the length of the negative electrode active material layer larger than the length of the positive electrode active material layer. In this case, as shown in FIG.
Since the positive electrode active materials 51 and 52 are coated on both surfaces of the positive electrode active material 51, the position shift between the positive electrode active material 51 and the negative electrode active material 53 corresponding to the positive electrode active material 51 during winding and the positive electrode active material 52 And a negative electrode active material 54 corresponding to the positive electrode active material 52
In consideration of the misalignment, the excess amount 55 of the negative electrode active materials 53 and 54 (the portion protruding from the positive electrode active materials 51 and 52) must be lengthened. Further, the length of the separator 57 in the winding direction must be increased in consideration of the displacement between the positive electrode active materials 51 and 52 and the negative electrode active materials 53 and 54. These also have the problem that the volume energy density and the weight energy density decrease.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、以上の事情
に鑑みなされたものであって、両集電体の強度低下を防
止しつつ薄型化すると共に、負極活物質の過剰分を短く
し、且つセパレータの巻回方向の長さを小さくすること
により、体積エネルギー密度と重量エネルギー密度とを
飛躍的に向上させることができる非水電解質電池の提供
を目的とする。SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and has been made to reduce the thickness of both current collectors while preventing the strength from being reduced. Another object of the present invention is to provide a non-aqueous electrolyte battery capable of dramatically improving the volume energy density and the weight energy density by reducing the length in the winding direction of the separator.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明のうちで請求項１記載の発明は、正極活物質
と負極活物質とが、セパレータを介して巻回される構造
の発電要素を備えた非水電解質電池において、絶縁膜
と、この絶縁膜の一方の面に固着された正極集電体と、
上記絶縁膜の他方の面に固着された負極集電体とから成
る３層構造の両極集電部材を有し、且つ、上記正極集電
体には上記正極活物質が塗着され、上記負極集電体には
負極活物質が塗着されていることを特徴とする。Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 of the present invention has a structure in which a positive electrode active material and a negative electrode active material are wound via a separator. In a non-aqueous electrolyte battery including a power generation element, an insulating film, a positive electrode current collector fixed to one surface of the insulating film,
An anode current collector having a three-layer structure including a negative electrode current collector fixed to the other surface of the insulating film, and the positive electrode active material coated on the positive electrode current collector; The current collector is coated with a negative electrode active material.
【０００８】上記構成の如く、正極集電体と負極集電体
とがそれぞれ絶縁膜に固定される３層構造の両極集電部
材を用いれば、両集電体の厚みを小さくしても両集電体
の強度低下を防止することができる。また、３層構造の
両極集電部材に正負極両活物質が塗着されているので、
これら両極集電部材に塗着された正負極両活物質間での
位置ずれは考慮しなくても良い（即ち、セパレータを介
して存在する正極活物質又は負極活物質との位置ずれの
みを考慮すれば良い）。したがって、巻回時の位置ずれ
が小さくなるので、負極活物質の過剰分を短くすること
ができる。加えて、巻回時の位置ずれが小さくなること
により、セパレータの巻回方向の長さを小さくすること
もできる。これらのことから、体積エネルギー密度と重
量エネルギー密度とが飛躍的に向上する。As described above, if a bipolar current collector having a three-layer structure in which the positive electrode current collector and the negative electrode current collector are respectively fixed to an insulating film is used, even if the thickness of both current collectors is reduced, A decrease in the strength of the current collector can be prevented. In addition, since the positive electrode and the negative electrode active material are coated on the bipolar current collector having a three-layer structure,
It is not necessary to consider the positional deviation between the positive and negative electrode active materials applied to these bipolar current collecting members (that is, only the positional deviation with the positive electrode active material or the negative electrode active material existing via the separator). Just do it). Therefore, the displacement during winding is reduced, and the excess of the negative electrode active material can be shortened. In addition, by reducing the displacement during winding, the length of the separator in the winding direction can be reduced. From these, the volume energy density and the weight energy density are dramatically improved.
【０００９】また、請求項２記載の発明は、請求項１記
載の発明において、上記絶縁膜は樹脂から成ることを特
徴とする。絶縁膜として樹脂を用いると、樹脂は金属に
比べて強度が大きいということから、上記効果が一層発
揮される。Further, the invention according to claim 2 is characterized in that, in the invention according to claim 1, the insulating film is made of a resin. When a resin is used as the insulating film, the above effect is further exerted because the resin has a higher strength than a metal.
【００１０】また、請求項３記載の発明は、請求項１又
は２記載の発明において、上記正極集電体はアルミニウ
ム箔から成り、上記負極集電体は銅箔から成ることを特
徴とする。The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the positive electrode current collector is made of an aluminum foil, and the negative electrode current collector is made of a copper foil.
【００１１】また、請求項４記載の発明は、請求項１、
２又は３記載の発明において、上記３層構造の両極集電
部材の厚みが１０μｍ以上２５μｍ以下であることを特
徴とする。このように規制するのは、両極集電部材の厚
みが１０μｍ未満であると、両集電体の強度が不十分と
なる場合がある一方、両極集電部材の厚みが２５μｍを
越えると、体積エネルギー密度と重量エネルギー密度と
の向上効果を十分に発揮することができないからであ
る。[0011] The invention described in claim 4 is based on claim 1,
4. The invention according to item 2 or 3, wherein the bipolar current collector having a three-layer structure has a thickness of 10 μm or more and 25 μm or less. The reason for this restriction is that if the thickness of the bipolar current collector is less than 10 μm, the strength of the bipolar current collector may be insufficient, while if the thickness of the bipolar current collector exceeds 25 μm, the volume may be reduced. This is because the effect of improving the energy density and the weight energy density cannot be sufficiently exhibited.
【００１２】また、請求項５記載の発明は、請求項１、
２、３又は４記載の発明において、上記正極活物質がリ
チウム含有複合酸化物から成ることを特徴とする。ま
た、請求項６記載の発明は、請求項１、２、３、４又は
５記載の発明において、上記負極活物質がリチウムイオ
ンを吸蔵、放出し得る炭素材料から成ることを特徴とす
る。[0012] The invention according to claim 5 is based on claim 1,
The invention according to 2, 3, or 4, wherein the positive electrode active material is made of a lithium-containing composite oxide. According to a sixth aspect of the present invention, in the first, second, third, fourth or fifth aspect, the negative electrode active material is made of a carbon material capable of occluding and releasing lithium ions.
【００１３】[0013]
【発明の実施の形態】本発明の実施の形態を、以下に説
明する。図１は本発明に係る非水電解質電池の正面図、
図２は図１のＡ−Ａ線矢視断面図、図３は本発明に係る
非水電解質電池に用いられる正負極の説明図、図４は本
発明に係る非水電解質電池に用いられる発電要素の説明
図、図５はラミネート外装体の断面図である。Embodiments of the present invention will be described below. FIG. 1 is a front view of a nonaqueous electrolyte battery according to the present invention,
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, FIG. 3 is an explanatory view of a positive electrode and a negative electrode used in the nonaqueous electrolyte battery according to the present invention, and FIG. FIG. 5 is a cross-sectional view of a laminate exterior body.
【００１４】図３に示すように、本発明の非水電解質電
池は、ポリエステルから成る絶縁膜（厚み：４μｍ）１
３と、この絶縁膜１３の一方の面にウレタン系接着剤
（厚みは絶縁膜１３等に比べて無視できる程小さい）に
より固着されアルミニウム箔から成る正極集電体（厚
み：４μｍ）１２と、上記絶縁膜１３の他方の面にウレ
タン系接着剤により固着され銅から成る負極集電体（厚
み：４μｍ）１４とから成る３層構造の両極集電部材１
１を有している。上記正極集電体１２にはＬｉＣｏＯ2
を主体とする正極活物質１５が塗着される一方、上記負
極集電体１４には炭素材料を主体とする負極活物質１６
が塗着されている。図４に示すように、上記両活物質１
５（図４では１５ａ又は１５ｂ）・１６（図４では１６
ａ又は１６ｂ）が塗着された両極集電部材１１は、ポリ
エチレン製のセパレータ１７を介して偏平渦巻き状に巻
回され、これによって図２に示す発電要素４を構成す
る。As shown in FIG. 3, the nonaqueous electrolyte battery of the present invention has an insulating film (thickness: 4 μm) 1 made of polyester.
3, a positive electrode current collector (thickness: 4 μm) 12 made of an aluminum foil and fixed to one surface of the insulating film 13 with a urethane-based adhesive (the thickness is negligibly small compared to the insulating film 13 and the like); An anode current collector 1 having a three-layer structure comprising a negative electrode current collector (thickness: 4 μm) 14 made of copper and fixed to the other surface of the insulating film 13 with a urethane adhesive.
One. LiCoO 2 is used as the positive electrode current collector 12.
A negative electrode active material 16 mainly composed of a carbon material is coated on the negative electrode current collector 14 while a positive electrode active material 15 mainly composed of
Is painted. As shown in FIG.
5 (15a or 15b in FIG. 4) and 16 (16 in FIG. 4)
The bipolar current collecting member 11 coated with a or 16b) is wound in a flat spiral shape through a separator 17 made of polyethylene, thereby constituting the power generating element 4 shown in FIG.
【００１５】また、図１に示すように、前記正極集電体
１２にはアルミニウムから成る正極タブ８が、上記負極
集電体１４にはニッケルから成る負極タブ９がそれぞれ
接続されている。As shown in FIG. 1, a positive electrode tab 8 made of aluminum is connected to the positive electrode current collector 12, and a negative electrode tab 9 made of nickel is connected to the negative electrode current collector 14, respectively.
【００１６】上記発電要素４は、収納空間５内に配置さ
れており、この収納空間５は、ラミネート外装体６の上
下端と中央部とをそれぞれ封止部７ａ・７ｂ・７ｃで封
口することにより形成される。また、収納空間５には、
エチレンカーボネート（ＥＣ）とジエチルカーボネート
（ＤＥＣ）とが体積比で３：７の割合で混合された混合
溶媒にＬｉＰＦ6 が１ｍｏｌ／ｌの割合で溶解された電
解液が注入されている。The power generating element 4 is disposed in a storage space 5, and the storage space 5 is configured such that upper and lower ends and a central portion of the laminate exterior body 6 are sealed by sealing portions 7 a, 7 b, and 7 c, respectively. Formed by In the storage space 5,
An electrolyte in which LiPF 6 is dissolved at a ratio of 1 mol / l is injected into a mixed solvent in which ethylene carbonate (EC) and diethyl carbonate (DEC) are mixed at a volume ratio of 3: 7.
【００１７】上記ラミネート外装体６の具体的な構造
は、図５に示すように、アルミニウム層（厚み：３０μ
ｍ）２１の一方の面に、ウレタン系接着剤から成る接着
剤層（厚み：２μｍ）２５を介してナイロン層（厚み：
２５μｍ）２２が接着され、このナイロン層２２にウレ
タン系接着剤から成る接着剤層（厚み：２μｍ）２６を
介してポリエチレンテレフタレート層（厚み：１２μ
ｍ）２３が接着される一方、アルミニウム層２１の他方
の面には、変性ポリプロピレンから成る接着剤層（厚
み：２μｍ）２７を介してポリプロピレン層（厚み：４
０μｍ）２４が接着される構造である。As shown in FIG. 5, the specific structure of the laminate exterior body 6 is an aluminum layer (thickness: 30 μm).
m) A nylon layer (thickness: 2 μm) on one side of 21 via an adhesive layer (thickness: 2 μm) 25 made of a urethane-based adhesive.
25 μm) 22 is adhered, and a polyethylene terephthalate layer (thickness: 12 μm) is bonded to the nylon layer 22 via an adhesive layer (thickness: 2 μm) 26 made of a urethane-based adhesive.
m) 23 is adhered, and on the other surface of the aluminum layer 21 is a polypropylene layer (thickness: 4) via an adhesive layer (thickness: 2 μm) 27 made of modified polypropylene.
0 μm) 24 is bonded.
【００１８】前記正極タブ８と前記負極タブ９とは、上
記ラミネート外装体６の封止部７ａから突出している。
正極タブ８は正極側の外部端子を兼用する一方、負極タ
ブ９は負極側の外部端子を兼用している。尚、上記構造
の電池の容量は６００ｍＡである。The positive electrode tab 8 and the negative electrode tab 9 protrude from the sealing portion 7a of the laminate case 6.
The positive electrode tab 8 also functions as an external terminal on the positive electrode side, while the negative electrode tab 9 also functions as an external terminal on the negative electrode side. The capacity of the battery having the above structure is 600 mA.
【００１９】ここで、上記構成の如く、正極集電体１２
と負極集電体１４とがそれぞれ絶縁膜１３に固定される
３層構造の両極集電部材１１を用いれば、両集電体１２
・１４の厚みを小さくしても両集電体１２・１４の強度
低下を防止することができる。また、図４に示すよう
に、３層構造の両極集電部材１１に正負極両活物質１５
ａ又は１５ｂ・１６ａ又は１６ｂが塗着されているの
で、これら両極集電部材１１に塗着された正負極両活物
質間（正極活物質１５ａと負極活物質１６ａとの間、又
は正極活物質１５ｂと負極活物質１６ｂとの間）での位
置ずれは考慮しなくても良い（即ち、セパレータ１７を
介して存在する正極活物質１５ａと負極活物質１６ｂと
の位置ずれのみを考慮すれば良い）。したがって、巻回
時の位置ずれが小さくなるので、負極活物質の過剰分１
８を短くすることができる。加えて、巻回時の位置ずれ
が小さくなることにより、セパレータ１７の巻回方向の
長さを小さくすることもできる。これらのことから、体
積エネルギー密度と重量エネルギー密度とが向上する。Here, as described above, the positive electrode current collector 12
When the bipolar current collector 11 having a three-layer structure in which the negative electrode current collector 14 and the negative electrode current collector 14 are respectively fixed to the insulating film 13 is used,
-Even if the thickness of 14 is reduced, the strength of both current collectors 12 and 14 can be prevented from decreasing. Further, as shown in FIG. 4, a positive / negative electrode active material 15 is provided on the bipolar current collector 11 having a three-layer structure.
a or 15b, 16a or 16b is applied between the positive and negative electrode active materials (between the positive electrode active material 15a and the negative electrode active material 16a or the positive electrode active material It is not necessary to consider the displacement between the cathode active material 15b and the anode active material 16b (that is, it is sufficient to consider only the displacement between the cathode active material 15a and the anode active material 16b that exist via the separator 17). ). Therefore, the displacement during winding is reduced, and the excess amount of the negative electrode active material is 1%.
8 can be shortened. In addition, by reducing the displacement during winding, the length of the separator 17 in the winding direction can be reduced. From these, the volume energy density and the weight energy density are improved.
【００２０】上記構造の電池を、以下のようにして作製
した。先ず、絶縁膜１３の一方の面に接着剤により正極
集電体１２を固着する一方、絶縁膜１３の他方の面に接
着剤により負極集電体１４を固着して、３層構造の両極
集電部材１１を作製した。次に、正極活物質としてのＬ
ｉＣｏＯ2 と炭素導電剤とグラファイトとフッ素樹脂系
結着剤とを質量比で、９２：３：２：３の割合で混合し
て正極合剤を作製した後、この正極合剤を両極集電部材
１１の正極集電体１２の表面に塗着、乾燥させた。次い
で、負極活物質としての炭素材料とスチレン系結着剤と
を質量比で、９８：２の割合で混合して負極合剤を作製
した後、この負極合剤を両極集電部材１１の負極集電体
１４の表面に塗着、乾燥し、更に圧延することにより正
負兼用電極を作製した。A battery having the above structure was manufactured as follows. First, the positive electrode current collector 12 is fixed on one surface of the insulating film 13 with an adhesive, and the negative electrode current collector 14 is fixed on the other surface of the insulating film 13 with an adhesive. The electrical member 11 was produced. Next, L as a positive electrode active material
A positive electrode mixture was prepared by mixing iCoO 2 , a carbon conductive agent, graphite and a fluororesin binder at a mass ratio of 92: 3: 2: 3, and then collecting the positive electrode mixture with both electrodes. The coating was applied to the surface of the positive electrode current collector 12 of the member 11 and dried. Next, a carbon material as a negative electrode active material and a styrene-based binder were mixed at a mass ratio of 98: 2 to prepare a negative electrode mixture, and then this negative electrode mixture was mixed with the negative electrode of the bipolar current collector 11. A positive / negative electrode was prepared by applying the coating on the surface of the current collector 14, drying, and rolling.
【００２１】この後、上記正極集電体１２及び負極集電
体１４に、それぞれ正極タブ８と負極タブ９とを取り付
けた後、正負兼用電極をセパレータ１７を介して配置す
る。しかる後、正負兼用電極及びセパレータ１７を偏平
渦巻状に巻回して発電要素４を作製した。Thereafter, the positive electrode tab 8 and the negative electrode tab 9 are attached to the positive electrode current collector 12 and the negative electrode current collector 14, respectively, and then the positive / negative electrode is disposed via the separator 17. Thereafter, the positive / negative electrode and the separator 17 were wound in a flat spiral shape to produce the power generating element 4.
【００２２】次いで、７層構造のラミネート材を用意し
た後、このラミネート材における両端のポリプロピレン
同士を重ね合わせ、更に、重ね合わせ部をインパルス加
熱法により溶着して、封止部７ｃを形成した。次に、こ
の筒状のラミネート材の収納空間５内に発電要素４を挿
入した。この際、筒状のラミネート材の一方の開口部か
ら両タブ８・９が突出するように発電要素４を配置し
た。次に、この状態で、両タブ８・９が突出している開
口部のラミネート材を溶着して封止し、封止部７ａを形
成した。この際、溶着は高周波誘導加熱装置を用いて行
った。Next, after preparing a laminated material having a seven-layer structure, the polypropylenes at both ends of the laminated material were overlapped with each other, and the overlapped portion was welded by an impulse heating method to form a sealing portion 7c. Next, the power generating element 4 was inserted into the storage space 5 of the cylindrical laminate material. At this time, the power generating element 4 was arranged so that the tabs 8 and 9 protruded from one opening of the cylindrical laminate. Next, in this state, the laminated material in the opening from which both tabs 8 and 9 protrude was welded and sealed to form a sealed portion 7a. At this time, welding was performed using a high-frequency induction heating device.
【００２３】次に、この状態で、真空加熱乾燥（温度：
１０５℃）を２時間行い、ラミネート材及び発電要素４
の水分を除去した。この後、エチレンカーボネート（Ｅ
Ｃ）とジエチルカーボネート（ＤＥＣ）とが体積比で
３：７の割合で混合された混合溶媒に、ＬｉＰＦ6 が１
ｍｏｌ／ｌの割合で溶解された電解液を注入した。しか
る後、上記封止部７ａとは反対側のラミネート材の端部
を高周波誘導溶着装置を用いて溶着し、封止部７ｂを形
成することにより、非水電解質電池を作製した。Next, in this state, drying by heating under vacuum (temperature:
105 ° C.) for 2 hours, and the laminate material and the power generation element 4
Of water was removed. Thereafter, ethylene carbonate (E
C) and diethyl carbonate (DEC) in a mixed solvent of 3: 7 in volume ratio, and LiPF 6 in an amount of 1: 1.
The dissolved electrolytic solution was injected at a rate of mol / l. Thereafter, the end of the laminate material opposite to the sealing portion 7a was welded using a high-frequency induction welding device to form a sealing portion 7b, thereby producing a non-aqueous electrolyte battery.
【００２４】なお、絶縁膜１３に用いられる樹脂として
は上記ポリエステルに限定するものではなく、ポリプロ
ピレン、ポリイミド、ポリオレフィン、ポリエーテル、
エーテルケトン等を用いることができる。The resin used for the insulating film 13 is not limited to the above polyester, but may be polypropylene, polyimide, polyolefin, polyether, or the like.
Ether ketone or the like can be used.
【００２５】また、接着剤としては、上記ウレタン系接
着剤に限定するものではなく、エチレン−ブタジエン共
重合体接着剤等を用いることができる。更に、３層構造
の両極集電部材１１の構造としては、上記のように両集
電体をそれぞれ絶縁膜の一方の面に接着するような方法
に限定するものではなく、絶縁膜の一方の面にアルミニ
ウムを他方の面に銅を蒸着するような構造であっても良
い。このように、蒸着法で作製すると、三者間の接着強
度が大きくなるという利点もある。The adhesive is not limited to the urethane-based adhesive, but may be an ethylene-butadiene copolymer adhesive or the like. Further, the structure of the bipolar current collecting member 11 having a three-layer structure is not limited to the method in which the current collectors are bonded to one surface of the insulating film as described above, but may be one of the insulating films. A structure in which aluminum is deposited on one surface and copper is deposited on the other surface may be used. As described above, the production by the vapor deposition method has an advantage that the adhesive strength between the three members is increased.
【００２６】加えて、正極集電体１２、負極集電体１
４、及び絶縁膜１３の厚みは上記の厚みに限定されるも
のではない。但し、両集電体１２・１４においては、正
極タブ８と負極タブ９とをそれぞれ超音波溶接する際
に、両集電体１２・１４に破れが発生するのを防止する
必要がある。したがって、正極集電体１２は４μｍ以
上、負極集電体１４は３μｍ以上であることが望まし
い。一方、両集電体１２・１４を余り厚くすると体積エ
ネルギー密度や重量エネルギー密度の向上を図れない。
したがって、両集電体１２・１４の厚みは５μｍ以下で
あることが望ましい。尚、正極集電体１２の厚みの下限
が負極集電体１４の厚みの下限よりも大きくなっている
のは、正極集電体１２はアルミニウムから成るため強度
が小さく、それに対応して厚くする必要があるというこ
と、及びアルミニウムは比重が小さいため、厚くしても
重量エネルギー密度が余り低下しないという理由による
ものである。一方、絶縁膜１３を余り薄くすると、両集
電体１２・１４間でショートが発生したり、絶縁膜１３
の引っ張り強度が弱くなるという問題が発生する一方、
余り厚くすると体積エネルギー密度や重量エネルギー密
度の向上を図れない。したがって、絶縁膜１３の厚みは
３〜１５μｍであることが望ましい。In addition, the positive electrode current collector 12 and the negative electrode current collector 1
4, and the thickness of the insulating film 13 is not limited to the above-described thickness. However, in the current collectors 12 and 14, when the positive electrode tab 8 and the negative electrode tab 9 are each ultrasonically welded, it is necessary to prevent the current collectors 12 and 14 from being broken. Therefore, it is desirable that the positive electrode current collector 12 be 4 μm or more, and the negative electrode current collector 14 be 3 μm or more. On the other hand, if the current collectors 12 and 14 are too thick, the volume energy density and the weight energy density cannot be improved.
Therefore, it is desirable that the thickness of both current collectors 12 and 14 be 5 μm or less. In addition, the reason why the lower limit of the thickness of the positive electrode current collector 12 is larger than the lower limit of the thickness of the negative electrode current collector 14 is that the positive electrode current collector 12 is made of aluminum, so that the strength is small and the thickness is correspondingly increased. This is because aluminum has a low specific gravity, so that even if it is made thicker, the weight energy density does not decrease so much. On the other hand, if the insulating film 13 is too thin, a short circuit may occur between the current collectors 12 and 14 or the insulating film 13
While the problem that the tensile strength of
If the thickness is too large, the volume energy density and the weight energy density cannot be improved. Therefore, it is desirable that the thickness of the insulating film 13 is 3 to 15 μm.
【００２７】また、本発明に用いられる電解液の溶媒と
しては上記のものに限らず、例えばエチレンカーボネー
トとジメチルカーボネート、エチルメチルカーボネー
ト、テトラヒドロフラン、１，２−ジメトキシエタン、
１，３−ジオキソラン、２−メトキシテトラヒドロフラ
ン、ジエチルエーテル等の低粘度低沸点溶媒とを適度な
比率で混合した溶媒を用いることができる。The solvent of the electrolytic solution used in the present invention is not limited to the above-mentioned ones. For example, ethylene carbonate and dimethyl carbonate, ethyl methyl carbonate, tetrahydrofuran, 1,2-dimethoxyethane,
A solvent obtained by mixing a low-viscosity, low-boiling solvent such as 1,3-dioxolan, 2-methoxytetrahydrofuran, diethyl ether or the like at an appropriate ratio can be used.
【００２８】更に、電解液の溶質としては、上記ＬｉＰ
Ｆ6 に限定するものではなく、ＬｉＢＦ4 、ＬｉＣｌＯ
4 、ＬｉＮ（ＳＯ2 Ｃ2 Ｆ5 ）2 、ＬｉＰＦ3 （Ｃ2 Ｆ
5 ） 3 、等を用いることができ、また、その量も１ｍｏ
ｌ／ｌに限定するものではない。Further, as the solute of the electrolytic solution, the above-mentioned LiP
F6Is not limited to LiBFFour, LiClO
Four, LiN (SOTwoCTwoFFive)Two, LiPFThree(CTwoF
Five) Three, Etc. can be used, and the amount thereof is 1 mo.
It is not limited to 1 / l.
【００２９】加えて、正極活物質としては、上記ＬｉＣ
ｏＯ2 に限定するものではなく、ＬｉＭｎ2 Ｏ4 、Ｌｉ
ＮｉＯ2 等であっても良い。また、外装体としてはアル
ミラミネート外装体に限定するものではなく、ＳＵＳか
ら成る外装缶、或いはアルミニウム又はアルミニウム合
金から成る外装缶でも良いことは勿論である。In addition, the above-mentioned LiC
It is not limited to oO 2 , but LiMn 2 O 4 , Li
NiO 2 or the like may be used. Further, the exterior body is not limited to the aluminum laminate exterior body, but may be an exterior can made of SUS or an exterior can made of aluminum or an aluminum alloy.
【００３０】[0030]
【実施例】（第１実施例） 〔実施例１〕実施例１としては、上記第１の形態に示す
両極集電部材を用いた。このような構造の両極集電部材
を、以下、本発明例Ａ１と称する。EXAMPLES (First Example) [Example 1] In Example 1, the bipolar current collector shown in the first embodiment was used. The bipolar current collector having such a structure is hereinafter referred to as Invention Example A1.
【００３１】〔実施例２〜７〕両極集電部材１１の厚み
を、それぞれ、６μｍ、８μｍ、１０μｍ、１５μｍ、
２０μｍ、及び２５μｍとする他は、上記実施例１と同
様にして両極集電部材を作製した。このようにして作製
した両極集電部材を、以下、それぞれ本発明例Ａ２〜Ａ
６と称する。[Embodiments 2 to 7] The thickness of the bipolar current collecting member 11 was 6 μm, 8 μm, 10 μm, 15 μm,
A bipolar current collector was produced in the same manner as in Example 1 except that the thickness was set to 20 μm and 25 μm. The bipolar current collectors thus produced are hereinafter referred to as Examples A2 to A of the present invention, respectively.
No. 6.
【００３２】〔比較例１〜７〕両極集電部材の代わり
に、アルミニウムから成り、厚みがそれぞれ、５μｍ、
６μｍ、８μｍ、１０μｍ、１２μｍ、１５μｍ、２０
μｍの正極集電体を用いた。このような正極集電体を、
以下、それぞれ比較例Ｘ１〜Ｘ７と称する。[Comparative Examples 1 to 7] Instead of the bipolar current collecting members, each was made of aluminum and had a thickness of 5 μm.
6 μm, 8 μm, 10 μm, 12 μm, 15 μm, 20
A μm positive electrode current collector was used. Such a positive electrode current collector,
Hereinafter, these are referred to as Comparative Examples X1 to X7, respectively.
【００３３】〔比較例８〜１４〕両極集電部材の代わり
に、銅から成り、厚みがそれぞれ、５μｍ、６μｍ、８
μｍ、１０μｍ、１２μｍ、１５μｍ、２０μｍの負極
集電体を用いた。このような負極集電体を、以下、それ
ぞれ比較例Ｘ８〜Ｘ１４と称する。[Comparative Examples 8 to 14] Instead of the bipolar current collecting members, they were made of copper and had thicknesses of 5 μm, 6 μm and 8 μm, respectively.
A negative electrode current collector of μm, 10 μm, 12 μm, 15 μm, and 20 μm was used. Such negative electrode current collectors are hereinafter referred to as Comparative Examples X8 to X14, respectively.
【００３４】〔実験１〕上記本発明例Ａ１〜Ａ７及び比
較例Ｘ１〜Ｘ１４における引っ張り強度を測定したの
で、その結果を表１〜表３に示す。尚、引っ張り強度の
試験は、正負極活物質塗布時或いは圧延時において、ロ
ール状のものを連続的に機械で処理する際に、最低限必
要とされる強度（具体的には、３．５ｋｇｆ／ｃｍ）を
限界点とし、当該強度における箔切れの有無及びシワの
有無について調べた。[Experiment 1] The tensile strengths of the inventive examples A1 to A7 and comparative examples X1 to X14 were measured, and the results are shown in Tables 1 to 3. The test of the tensile strength is the minimum required strength (specifically, 3.5 kgf) when the rolled material is continuously processed by a machine at the time of coating or rolling the positive and negative electrode active materials. / Cm) as a limit point, the presence or absence of foil breakage and the presence or absence of wrinkles at the strength were examined.
【００３５】[0035]
【表１】 [Table 1]
【００３６】[0036]
【表２】 [Table 2]
【００３７】[0037]
【表３】 [Table 3]
【００３８】表１〜表３から明らかなように、アルミニ
ウムから成る正極集電体と銅から成る負極集電体を用い
た従来の電池においては、正極集電体（比較例Ｘ１〜Ｘ
７）の厚みが１５μｍ未満であると箔切れやシワが生
じ、また負極集電体（比較例Ｘ８〜Ｘ１４）の厚みが１
２μｍ未満であると箔切れやシワが生じる。したがっ
て、従来の電池では、両集電体の厚みの合計が２７μｍ
以上必要となる。これに対して、３層構造の両極集電部
材を用いた本発明の電池では、両極集電部材の厚みが６
μｍでも箔切れやシワが生じないことが認められる。As is clear from Tables 1 to 3, in a conventional battery using a positive electrode current collector made of aluminum and a negative electrode current collector made of copper, a positive electrode current collector (Comparative Examples X1 to X
If the thickness of 7) is less than 15 μm, foil breakage or wrinkling occurs, and the thickness of the negative electrode current collector (Comparative Examples X8 to X14) is 1
If it is less than 2 μm, the foil may be broken or wrinkled. Therefore, in the conventional battery, the total thickness of both current collectors is 27 μm
This is necessary. On the other hand, in the battery of the present invention using the bipolar current collector having a three-layer structure, the thickness of the bipolar current collector is 6 mm.
It is recognized that foil breakage and wrinkles do not occur even at μm.
【００３９】〔実験２〕上記本発明例Ａ１〜Ａ７及び比
較例Ｘ１〜Ｘ１４の集電体（両極集電部材）に、実際に
正極活物質、負極活物質を塗布し、更にロール式圧縮機
を用いて圧延し、シワの有無及び箔切れの有無について
調べたので、その結果を表４〜表６に示す。[Experiment 2] A positive electrode active material and a negative electrode active material were actually applied to the current collectors (bipolar current collectors) of Examples A1 to A7 of the present invention and Comparative Examples X1 to X14. And the presence or absence of wrinkles and the presence or absence of foil breakage were examined. The results are shown in Tables 4 to 6.
【００４０】[0040]
【表４】 [Table 4]
【００４１】[0041]
【表５】 [Table 5]
【００４２】[0042]
【表６】 [Table 6]
【００４３】表４〜表６から明らかなように、正極集電
体（比較例Ｘ１〜Ｘ７）の厚みが１５μｍ未満であると
箔切れやシワが生じ、また負極集電体（比較例Ｘ８〜Ｘ
１４）の厚みが１２μｍ未満であると箔切れやシワが生
じる。したがって、従来の電池では、両集電体の厚みの
合計が２７μｍ以上必要となる。As is clear from Tables 4 to 6, when the thickness of the positive electrode current collector (Comparative Examples X1 to X7) is less than 15 μm, the foil is cut or wrinkled, and the negative electrode current collector (Comparative Examples X8 to X7). X
If the thickness of 14) is less than 12 μm, foil breaks and wrinkles occur. Therefore, in the conventional battery, the total thickness of both current collectors needs to be 27 μm or more.
【００４４】これに対して、３層構造の両極集電部材を
用いた本発明の電池では、両極集電部材の厚みが６μｍ
（本発明例Ａ２）では箔切れが生じたりシワが生じるこ
とがあり、また両極集電部材の厚みが８μｍ（本発明例
Ａ３）ではシワが生じることが時々あるが、両極集電部
材の厚みが１０μｍ以上（本発明例Ａ１、本発明例Ａ４
〜Ａ７）では箔切れが生じたりシワが生じることがな
い。On the other hand, in the battery of the present invention using the bipolar current collector having a three-layer structure, the thickness of the bipolar current collector is 6 μm.
(Example A2 of the present invention) may cause foil breakage or wrinkles. If the thickness of the bipolar current collecting member is 8 μm (example A3 of the present invention), wrinkles may occasionally occur. Is 10 μm or more (Example A1 of the invention, Example A4 of the invention)
In ~ A7), foil breakage or wrinkling does not occur.
【００４５】上記実験１及び実験２から明らかなよう
に、本発明の電池では、引っ張り強度を維持しつつ、電
池反応には直接寄与しない両集電体の厚みを小さくする
ことができるので、体積エネルギー密度や重量エネルギ
ー密度の向上を図ることができる。As is clear from the above Experiments 1 and 2, in the battery of the present invention, while maintaining the tensile strength, the thickness of both current collectors that do not directly contribute to the battery reaction can be reduced, so that the volume of the battery can be reduced. Energy density and weight energy density can be improved.
【００４６】[0046]
【発明の効果】以上説明したように、本発明によれば、
両集電体の強度低下を防止しつつ薄型化すると共に、負
極活物質の過剰分を短くし、且つセパレータの巻回方向
の長さを小さくすることができるので、体積エネルギー
密度と重量エネルギー密度とを飛躍的に向上することが
できるといった優れた効果を奏する。As described above, according to the present invention,
Both the current collectors can be made thin while preventing the strength from decreasing, and the excess amount of the negative electrode active material can be shortened, and the length in the winding direction of the separator can be reduced. And an excellent effect that it can be dramatically improved.
【図１】本発明に係る非水電解質電池の正面図。FIG. 1 is a front view of a nonaqueous electrolyte battery according to the present invention.
【図２】図１のＡ−Ａ線矢視断面図。FIG. 2 is a sectional view taken along line AA of FIG. 1;
【図３】本発明に係る非水電解質電池に用いられる正負
極の説明図。FIG. 3 is an explanatory diagram of positive and negative electrodes used in the nonaqueous electrolyte battery according to the present invention.
【図４】本発明に係る非水電解質電池に用いられる発電
要素の説明図。FIG. 4 is an explanatory diagram of a power generation element used in the nonaqueous electrolyte battery according to the present invention.
【図５】ラミネート外装体の断面図。FIG. 5 is a cross-sectional view of a laminate exterior body.
【図６】従来例に係る非水電解質電池に用いられる発電
要素の説明図。FIG. 6 is an explanatory diagram of a power generation element used in a nonaqueous electrolyte battery according to a conventional example.
１１：両極集電部材 １２：正極集電体 １３：絶縁膜 １４：負極集電体 １５：正極活物質 １６：負極活物質 11: Bipolar current collector 12: Positive current collector 13: Insulating film 14: Negative current collector 15: Positive active material 16: Negative active material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 生川 訓 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 Ｆターム(参考） 5H017 AA03 AS01 CC01 EE01 EE05 5H029 AJ03 AK03 AL06 AM03 AM04 AM05 AM07 BJ02 BJ14 DJ07 HJ04 HJ12 5H050 AA08 BA17 CA08 CA09 CB07 EA09 EA24 EA25 FA02 FA03 HA04 HA12 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Nori Ikukawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 5H017 AA03 AS01 CC01 EE01 EE05 5H029 AJ03 AK03 AL06 AM03 AM04 AM05 AM07 BJ02 BJ14 DJ07 HJ04 HJ12 5H050 AA08 BA17 CA08 CA09 CB07 EA09 EA24 EA25 FA02 FA03 HA04 HA12
Claims (6)
タを介して巻回される構造の発電要素を備えた非水電解
質電池において、 絶縁膜と、この絶縁膜の一方の面に固着された正極集電
体と、上記絶縁膜の他方の面に固着された負極集電体と
から成る３層構造の両極集電部材を有し、且つ、上記正
極集電体には上記正極活物質が塗着され、上記負極集電
体には負極活物質が塗着されていることを特徴とする非
水電解質電池。1. A non-aqueous electrolyte battery provided with a power generating element having a structure in which a positive electrode active material and a negative electrode active material are wound via a separator, wherein the non-aqueous electrolyte is fixed to one surface of the insulating film. And a negative electrode current collector fixed to the other surface of the insulating film. The positive electrode current collector has a three-layer structure, and the positive electrode current collector includes , And a negative electrode active material is coated on the negative electrode current collector.
載の非水電解質電池。2. The non-aqueous electrolyte battery according to claim 1, wherein said insulating film is made of a resin.
り、上記負極集電体は銅箔から成る、請求項１又は２記
載の非水電解質電池。3. The non-aqueous electrolyte battery according to claim 1, wherein the positive electrode current collector is made of an aluminum foil, and the negative electrode current collector is made of a copper foil.
０μｍ以上２５μｍ以下である、請求項１、２又は３記
載の非水電解質電池。4. The thickness of the bipolar current collecting member having a three-layer structure is 1
The non-aqueous electrolyte battery according to claim 1, 2 or 3, wherein the thickness is from 0 µm to 25 µm.
物から成る、請求項１、２、３又は４記載の非水電解質
電池。5. The non-aqueous electrolyte battery according to claim 1, wherein the positive electrode active material comprises a lithium-containing composite oxide.
蔵、放出し得る炭素材料から成る、請求項１、２、３、
４又は５記載の非水電解質電池。6. The method according to claim 1, wherein the negative electrode active material comprises a carbon material capable of occluding and releasing lithium ions.
6. The non-aqueous electrolyte battery according to 4 or 5.
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| JP2000261724A JP2002075456A (en) | 2000-08-30 | 2000-08-30 | Nonaqueous electrolyte cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000261724A JP2002075456A (en) | 2000-08-30 | 2000-08-30 | Nonaqueous electrolyte cell |
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|---|---|
| JP2002075456A true JP2002075456A (en) | 2002-03-15 |
Family
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104662723A (en) * | 2012-07-06 | 2015-05-27 | 橙力电池株式会社 | Electrode assembly, battery comprising same, and method for manufacturing same |
| WO2021192256A1 (en) * | 2020-03-27 | 2021-09-30 | Tdk株式会社 | Electrode body, electricity storage element, and electricity storage module |
-
2000
- 2000-08-30 JP JP2000261724A patent/JP2002075456A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104662723A (en) * | 2012-07-06 | 2015-05-27 | 橙力电池株式会社 | Electrode assembly, battery comprising same, and method for manufacturing same |
| JP2015528180A (en) * | 2012-07-06 | 2015-09-24 | オレンジ パワー リミテッド | Electrode assembly, battery including the same, and manufacturing method thereof |
| WO2021192256A1 (en) * | 2020-03-27 | 2021-09-30 | Tdk株式会社 | Electrode body, electricity storage element, and electricity storage module |
| JPWO2021192256A1 (en) * | 2020-03-27 | 2021-09-30 | ||
| JP7332034B2 (en) | 2020-03-27 | 2023-08-23 | Tdk株式会社 | Electrode body, power storage element and power storage module |
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