JPH10106627A - Lithium battery - Google Patents
Lithium batteryInfo
- Publication number
- JPH10106627A JPH10106627A JP8256389A JP25638996A JPH10106627A JP H10106627 A JPH10106627 A JP H10106627A JP 8256389 A JP8256389 A JP 8256389A JP 25638996 A JP25638996 A JP 25638996A JP H10106627 A JPH10106627 A JP H10106627A
- Authority
- JP
- Japan
- Prior art keywords
- separator
- holes
- positive electrode
- negative electrode
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、セパレータに固体
電解質を用いたリチウム電池に関するものである。The present invention relates to a lithium battery using a solid electrolyte as a separator.
【０００２】[0002]
【従来の技術】固体電解質を用いたリチウム電池は、 電
解質が固体であり漏液の問題がないことから、 ポータブ
ル用途などに期待されている。 しかし、 出力密度がリチ
ウムイオン電池に比べて劣るために、 電極や電解質を薄
型化し高出力化に工夫をこらしている。 極板を薄型化と
同時に大型化して大容量化するには、 次のような問題が
ある。2. Description of the Related Art Lithium batteries using solid electrolytes are expected to be used in portable applications because the electrolyte is solid and there is no problem of liquid leakage. However, since the output density is inferior to that of lithium-ion batteries, efforts have been made to make the electrodes and electrolyte thinner and increase the output. In order to increase the capacity by increasing the size of the electrode plate while reducing its thickness, there are the following problems.
【０００３】すなわち、図５の従来構造の電池を参照し
て説明すると、正極または負極を作製する時、薄い集電
体のシート１６または１７に均一の厚みで活物質１８ま
たは１９を塗布する必要があるが、この作業が困難であ
った。また、この薄いシート１６または１７の厚みは
０．１ｍｍ程度で、 取扱いが困難であり、更に、 大きな
面積にすると、薄いシート１６または１７自体に強度が
なく、 作業中に変形が生じ、 活物質１８または１９とセ
パレータ２０が一様に密着しなかった。また、活物質１
８または１９とセパレータ２０である電解質がもともと
接着性が劣るため、さらに電池性能を低下させるという
問題点を有していた。なお、２１は封口体である。More specifically, referring to the battery having the conventional structure shown in FIG. 5, when producing a positive electrode or a negative electrode, it is necessary to apply an active material 18 or 19 with a uniform thickness to a thin current collector sheet 16 or 17. However, this was difficult. In addition, the thickness of the thin sheet 16 or 17 is about 0.1 mm, which is difficult to handle. Further, if the area is large, the thin sheet 16 or 17 itself has no strength and is deformed during work, and the active material 18 or 19 and the separator 20 did not adhere uniformly. Active material 1
Since the electrolyte of 8 or 19 and the electrolyte as the separator 20 originally had poor adhesion, there was a problem that the battery performance was further reduced. In addition, 21 is a sealing body.
【０００４】[0004]
【発明が解決しようする課題】本発明は上記問題点を解
決するものであって、その目的とするところは製作およ
び使用時の電極の変形を抑制して、 大型化および長寿命
化を可能とする高出力のリチウム電池を提供することに
ある。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to suppress deformation of an electrode during manufacture and use, thereby enabling an increase in size and a longer life. To provide a high-power lithium battery.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、正極と負極の間にセパレータが積層され
ているリチウム電池において、前記正極および負極は、
電気絶縁性シートと集電体と活物質とを有するものであ
り、前記電気絶縁性シートは、複数の貫通孔が形成され
たものであり、前記活物質は、前記貫通孔に充填されて
おり、前記電気絶縁性シートと前記集電体とは積層され
ており、前記セパレータは、固体電解質からなることを
特徴とするものである。また、前記セパレータは、電気
絶縁性シートに複数の貫通孔が形成され、該貫通孔に電
解質が充填されたものであり、前記正極と前記セパレー
タと前記負極は、それぞれの貫通孔が連なって、該貫通
孔を除く部分同士が接着されていることが強度を増す上
で好ましい。Means for Solving the Problems To solve the above problems, the present invention provides a lithium battery in which a separator is laminated between a positive electrode and a negative electrode, wherein the positive electrode and the negative electrode are:
An electric insulating sheet, a current collector, and an active material, wherein the electric insulating sheet has a plurality of through holes formed therein, and the active material is filled in the through holes. The electric insulating sheet and the current collector are laminated, and the separator is made of a solid electrolyte. The separator has a plurality of through holes formed in an electrically insulating sheet, and the through holes are filled with an electrolyte.The through holes of the positive electrode, the separator, and the negative electrode are continuous, It is preferable that parts other than the through holes are bonded to each other in order to increase strength.
【０００６】[0006]
【作用】複数の貫通孔を有する電気絶縁性シートを集電
体に接着することにより、集電体の強度が増し、活物質
を塗布するときに集電体が変形することがない。従っ
て、貫通孔に均一に活物質を塗布できる。また、電極が
電気絶縁性シートで強度が増すので、電極とセパレータ
の接着が均一にできる。さらに、セパレータも電気絶縁
シートで強度を増すと電極とセパレータの組立作業が簡
単になる。また、電極とセパレータの貫通孔を除く部
分、すなわちこれらの電気絶縁性シート同士を接着する
と接着強度が増し、電極とセパレータの密着性が優れ
る。By bonding an electrically insulating sheet having a plurality of through holes to the current collector, the strength of the current collector is increased, and the current collector is not deformed when the active material is applied. Therefore, the active material can be uniformly applied to the through holes. In addition, since the strength of the electrode is increased by the electrically insulating sheet, the adhesion between the electrode and the separator can be made uniform. Further, when the strength of the separator is increased by the electric insulating sheet, the assembling work of the electrode and the separator is simplified. Further, when the portions of the electrode and the separator other than the through holes, that is, these electrically insulating sheets are bonded to each other, the bonding strength is increased, and the adhesion between the electrode and the separator is excellent.
【０００７】[0007]
【発明の実施の形態】以下、発明の実施形態を図面に基
づいて説明する。 （実施形態１）図１は本発明の一実施形態を示す断面
図、図２は図１の正極を活物質側からみた平面図であ
り、１は正極、２は負極、３はセパレータ、４と５は電
気絶縁性シート、６は正極集電体、７は正極活物質、８
は負極集電体、９は負極活物質、１０と１１は貫通孔、
１２は封口材である。Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of the positive electrode of FIG. 1 as viewed from the active material side, 1 is a positive electrode, 2 is a negative electrode, 3 is a separator, And 5 are an electrically insulating sheet, 6 is a positive electrode current collector, 7 is a positive electrode active material, 8
Is a negative electrode current collector, 9 is a negative electrode active material, 10 and 11 are through holes,
12 is a sealing material.
【０００８】図のように、正極１は、厚さ５０μｍのア
ルミニウム箔からなる正極集電体６に厚さ１００μｍの
電気絶縁性シート４を積層したものである。該シート４
は、変性ポリエチレンからなり、空孔率が８０％になる
ように直径２ｍｍの貫通孔１０が多数形成されており、
該貫通孔１０にコバルト酸リチウムからなる正極活物質
７が充填されている。負極２は、厚さ５０μｍの銅箔か
らなる負極集電体８に厚さ１００μｍの電気絶縁性シー
ト５を積層したものである。該シート５は正極のシート
４と同じ材質、形状であり、貫通孔１１には、カーボン
からなる負極活物質９が充填されている。セパレータ３
は、ポリプロピレン製の不織布にリチウム塩を混合した
ポリエチレンオキシドを主成分としたポリマーを含浸さ
せた電解質である。前記正極１と負極２とセパレータ３
は図１のように積層され、正極１と負極２の外周部の間
を封口材１２で封口し、電池内を密閉化している。As shown in the figure, a positive electrode 1 is obtained by laminating a 100 μm-thick electrically insulating sheet 4 on a positive electrode current collector 6 made of a 50 μm-thick aluminum foil. The sheet 4
Is made of modified polyethylene, and a large number of through holes 10 having a diameter of 2 mm are formed so that the porosity is 80%.
The through holes 10 are filled with a positive electrode active material 7 made of lithium cobalt oxide. The negative electrode 2 is obtained by laminating a 100 μm-thick electrically insulating sheet 5 on a negative electrode current collector 8 made of a 50 μm-thick copper foil. The sheet 5 has the same material and shape as the sheet 4 of the positive electrode, and the through holes 11 are filled with the negative electrode active material 9 made of carbon. Separator 3
Is an electrolyte obtained by impregnating a polypropylene-based nonwoven fabric with a polymer mainly composed of polyethylene oxide in which a lithium salt is mixed. The positive electrode 1, the negative electrode 2, and the separator 3
Are laminated as shown in FIG. 1 and the space between the outer peripheral portions of the positive electrode 1 and the negative electrode 2 is sealed with a sealing material 12 to hermetically seal the inside of the battery.
【０００９】（実施形態２）図３は本発明の他の実施形
態を示す断面図であり、図１と同一符号は同一名称を示
す。 本実施形態における正極１と負極２は、実施形態
１と同様な構成である。セパレータ３は、貫通孔１３を
有する電気絶縁性シート１４からなり、該貫通孔１３が
直径２ｍｍで、シート１４の空孔率が８０％になるよう
に多数形成されている。また、該貫通孔１４には固体電
解質１５が充填されている。その他の構成は、実施形態
１と同じである。ただし、正極１とセパレータ３と負極
２は、それぞれの貫通孔１０，１３，１１が連なるよう
に配置され、貫通孔を除く部分（電気絶縁性シート４，
１４，５の部分）が接着されている。(Embodiment 2) FIG. 3 is a sectional view showing another embodiment of the present invention, and the same reference numerals as those in FIG. 1 denote the same names. The positive electrode 1 and the negative electrode 2 in the present embodiment have the same configuration as in the first embodiment. The separator 3 is formed of an electrically insulating sheet 14 having a through hole 13, and a large number of the through holes 13 are formed to have a diameter of 2 mm and a porosity of the sheet 14 of 80%. The through hole 14 is filled with a solid electrolyte 15. Other configurations are the same as in the first embodiment. However, the positive electrode 1, the separator 3 and the negative electrode 2 are arranged so that the respective through holes 10, 13, 11 are connected to each other, and the portion excluding the through holes (the electric insulating sheet 4,
14 and 5) are adhered.
【００１０】[0010]
【実施例】次に、本発明の実施形態１の製造方法につい
て説明する。先ず、正極集電体６上に多数の貫通孔１０
を有する電気絶縁性シート４を熱接着し、コバルト酸リ
チウムの粉末と有機溶剤を混合しペースト状とした正極
活物質を前記シート４の貫通孔１０に充填して乾燥させ
た。同様に、負極集電体８上に多数の貫通孔１１を有す
る電気絶縁性シート５を熱接着し、カーボン粉末と有機
溶剤を混合しペースト状とした負極活物質９を前記シー
ト５の貫通孔１１に充填して乾燥させた。また、ポリプ
ロピレン製不織布にリチウム塩を混合したポリエチレン
オキシドを主成分としたポリマーを含浸させて電解質で
あるセパレータ３を作製した。Next, a manufacturing method according to the first embodiment of the present invention will be described. First, a large number of through holes 10 are formed on the positive electrode current collector 6.
Was electrically bonded, and a paste of a positive electrode active material obtained by mixing lithium cobalt oxide powder and an organic solvent was filled in the through holes 10 of the sheet 4 and dried. Similarly, an electrically insulating sheet 5 having a large number of through-holes 11 is heat-bonded on the negative electrode current collector 8, and a carbon powder and an organic solvent are mixed to form a paste-like negative electrode active material 9. 11 and dried. Separator 3 as an electrolyte was prepared by impregnating a polypropylene nonwoven fabric with a polymer mainly composed of polyethylene oxide mixed with a lithium salt.
【００１１】次に、これら正極１と負極２とセパレータ
３を正極／セパレータ／負極の順に積層し、電解質（セ
パレータ３）を包み込むように正極１と負極２の間の外
周囲に封口材１２を取り付け、縦１５０ｍｍ、横２００
ｍｍ、高さ５００μｍの本発明の電池Ａを作製した。Next, the positive electrode 1, the negative electrode 2, and the separator 3 are laminated in the order of positive electrode / separator / negative electrode, and a sealing material 12 is wrapped around the outer periphery between the positive electrode 1 and the negative electrode 2 so as to enclose the electrolyte (separator 3). Mounting, length 150mm, width 200
The battery A of the present invention having a height of 500 mm and a height of 500 μm was prepared.
【００１２】次に、本発明の実施形態２の製造方法につ
いて説明する。正極１と負極２は実施形態１と同様にし
て作製する。セパレータ３は、リチウム塩を混合したポ
リエチレンオキサイドを主成分とするポリマー１５を多
数の貫通孔１３を有する電気絶縁シート１４に充填して
作製した。そして、電池Ａと同様に正極／セパレータ／
負極の順に積層し、本発明の電池Ｂを作製した。また、
比較のために、図５のような従来電池Ｃを作製した。Next, a manufacturing method according to a second embodiment of the present invention will be described. The positive electrode 1 and the negative electrode 2 are manufactured in the same manner as in the first embodiment. The separator 3 was prepared by filling a polymer 15 containing polyethylene oxide containing lithium salt as a main component into an electric insulating sheet 14 having a large number of through holes 13. Then, similarly to the battery A, the positive electrode / separator /
The batteries were laminated in the order of the negative electrode to produce a battery B of the present invention. Also,
For comparison, a conventional battery C as shown in FIG. 5 was manufactured.
【００１３】（試験）電池Ａ〜Ｃを、６０℃で５０μＡ
／ｃｍ2 の定電流充放電サイクル試験を行った。なお、
充電終止電圧４．１Ｖ、放電終止電圧２．７Ｖの条件と
した。その結果を図４に示す。集電体に電気絶縁性シー
トを接着をせしめた本発明の電池Ａは、従来形電池Ｃよ
り電池寿命が向上した。また、電極とセパレータに電気
絶縁性シートを用い、セパレータのシートを電極のシー
トと接着して一体化させた本発明の電池Ｂは電池Ａより
更に長寿命であった。劣化した電池を調査すると電池Ｃ
は集電体が活物質と剥離しており本発明電池Ａ，Ｂは正
負活物質と電解質層の接着が改善されたため長寿命とな
ったものである。(Test) Batteries A to C were subjected to 50 μA at 60 ° C.
/ Cm 2 constant current charge / discharge cycle test. In addition,
The conditions were a charge end voltage of 4.1 V and a discharge end voltage of 2.7 V. FIG. 4 shows the results. Battery A of the present invention in which an electrical insulating sheet was bonded to a current collector had a longer battery life than conventional battery C. Further, the battery B of the present invention, in which an electrically insulating sheet was used for the electrode and the separator and the separator sheet was bonded to and integrated with the electrode sheet, had a longer life than the battery A. Investigation of the deteriorated battery shows that battery C
Indicates that the current collector has peeled off from the active material, and the batteries A and B of the present invention have a long life due to improved adhesion between the positive and negative active materials and the electrolyte layer.
【００１４】なお、本実施形態では、電極に電気絶縁性
シートを用いて電極強度を増しているが、単に電池強度
を増すだけであれば、セパレータに電気絶縁性シートを
用い、電極は従来形とした積層電池としてもよい。この
場合は、電極の作製時に集電体に活物質を一様に塗布す
ることが困難で、電池性能を低下させるという問題点が
解決されない。In this embodiment, the electrode strength is increased by using an electrically insulating sheet for the electrode. However, if only the battery strength is to be increased, the electric insulating sheet is used for the separator and the electrode is made of a conventional type. A stacked battery may be used. In this case, it is difficult to uniformly apply the active material to the current collector at the time of manufacturing the electrode, and the problem of lowering the battery performance cannot be solved.
【００１５】[0015]
【発明の効果】以上の説明から明らかなように、本発明
の電池の組立作業が簡単であり、充放電を繰り返しても
正負活物質とセパレータの密着が保たれており、長寿命
化することができ、極めて工業的に有効である。As is clear from the above description, the battery of the present invention is easy to assemble, maintains the close contact between the positive and negative active materials and the separator even after repeated charging and discharging, and extends the life. And is extremely industrially effective.
【図１】本発明の実施形態１を示す断面図である。FIG. 1 is a sectional view showing Embodiment 1 of the present invention.
【図２】実施形態１の電極を示す平面図である。FIG. 2 is a plan view showing an electrode according to the first embodiment.
【図３】本発明の実施形態２を示す断面図である。FIG. 3 is a sectional view showing Embodiment 2 of the present invention.
【図４】本発明の電池と従来の電池の充放電サイクル数
と電池容量との関係を示すグラフである。FIG. 4 is a graph showing the relationship between the number of charge / discharge cycles and the battery capacity of the battery of the present invention and a conventional battery.
【図５】従来の電池（比較形態）を示す断面図である。FIG. 5 is a cross-sectional view showing a conventional battery (comparative embodiment).
１ 正極 ２ 負極 ３ セパレータ ４，５，１４ 電気絶縁性シート ６ 正極集電体 ７ 正極活物質 ８ 負極集電体 ９ 負極活物質 １０，１１，１３ 貫通孔 １５ 固体電解質 DESCRIPTION OF SYMBOLS 1 Positive electrode 2 Negative electrode 3 Separator 4,5,14 Electrically insulating sheet 6 Positive electrode collector 7 Positive electrode active material 8 Negative electrode collector 9 Negative electrode active material 10,11,13 Through hole 15 Solid electrolyte
Claims (2)
ているリチウム電池であって、 前記正極および負極
は、電気絶縁性シートと集電体と活物質とを有するもの
であり、 前記シートは、複数の貫通孔が形成されたものであり、 前記活物質は、前記貫通孔に充填されており、 前記シートと前記集電体とは積層されており、 前記セパレータは、固体電解質からなることを特徴とす
る、 リチウム電池。1. A lithium battery in which a separator is stacked between a positive electrode and a negative electrode, wherein the positive electrode and the negative electrode have an electrically insulating sheet, a current collector, and an active material. A plurality of through holes are formed, the active material is filled in the through holes, the sheet and the current collector are stacked, and the separator is made of a solid electrolyte. A lithium battery.
ているリチウム電池であって、 前記正極および負極
は、電気絶縁性シートと集電体と活物質とを有するもの
であり、 前記シートは、複数の貫通孔が形成されたものであり、 前記活物質は、前記貫通孔に充填されており、 前記シートと前記集電体とは積層されており、 前記セパレータは、電気絶縁性シートに複数の貫通孔が
形成され、該貫通孔に電解質が充填されたものであり、 前記正極と前記セパレータと前記負極の貫通孔同士が連
なって、該貫通孔を除く部分同士が接着していることを
特徴とする、 リチウム電池。2. A lithium battery in which a separator is stacked between a positive electrode and a negative electrode, wherein the positive electrode and the negative electrode have an electrically insulating sheet, a current collector, and an active material. A plurality of through holes are formed; the active material is filled in the through holes; the sheet and the current collector are stacked; and the separator is an electrically insulating sheet. A plurality of through holes are formed, and the through holes are filled with an electrolyte. The through holes of the positive electrode, the separator, and the negative electrode are connected to each other, and the portions except for the through holes are bonded to each other. A lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8256389A JPH10106627A (en) | 1996-09-27 | 1996-09-27 | Lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8256389A JPH10106627A (en) | 1996-09-27 | 1996-09-27 | Lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10106627A true JPH10106627A (en) | 1998-04-24 |
Family
ID=17292004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8256389A Pending JPH10106627A (en) | 1996-09-27 | 1996-09-27 | Lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10106627A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030060324A (en) * | 2002-01-08 | 2003-07-16 | 삼성에스디아이 주식회사 | Lithium polymer secondary battery and manufacturing method thereof |
| US6737196B2 (en) | 1998-10-13 | 2004-05-18 | Samsung Display Devices Co., Ltd. | Method of making a lithium polymer battery and battery made by the method |
| JP2006054119A (en) * | 2004-08-12 | 2006-02-23 | Nissan Motor Co Ltd | Bipolar battery and battery pack |
| KR100702031B1 (en) | 2006-02-22 | 2007-03-30 | 삼성전자주식회사 | Semiconductor device with battery |
| US9257718B2 (en) | 2006-08-31 | 2016-02-09 | Seiko Epson Corporation | Secondary battery |
| US9548497B2 (en) | 2011-06-10 | 2017-01-17 | Eaglepicher Technologies, Llc | Layered composite current collector with plurality of openings, methods of manufacture thereof, and articles including the same |
| US10840548B2 (en) | 2018-04-03 | 2020-11-17 | Toyota Jidosha Kabushiki Kaisha | Solid electrolyte laminate and all-solid-state battery using the same |
-
1996
- 1996-09-27 JP JP8256389A patent/JPH10106627A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6737196B2 (en) | 1998-10-13 | 2004-05-18 | Samsung Display Devices Co., Ltd. | Method of making a lithium polymer battery and battery made by the method |
| KR20030060324A (en) * | 2002-01-08 | 2003-07-16 | 삼성에스디아이 주식회사 | Lithium polymer secondary battery and manufacturing method thereof |
| JP2006054119A (en) * | 2004-08-12 | 2006-02-23 | Nissan Motor Co Ltd | Bipolar battery and battery pack |
| JP4670275B2 (en) * | 2004-08-12 | 2011-04-13 | 日産自動車株式会社 | Bipolar battery and battery pack |
| KR100702031B1 (en) | 2006-02-22 | 2007-03-30 | 삼성전자주식회사 | Semiconductor device with battery |
| US9257718B2 (en) | 2006-08-31 | 2016-02-09 | Seiko Epson Corporation | Secondary battery |
| US9548497B2 (en) | 2011-06-10 | 2017-01-17 | Eaglepicher Technologies, Llc | Layered composite current collector with plurality of openings, methods of manufacture thereof, and articles including the same |
| US10840548B2 (en) | 2018-04-03 | 2020-11-17 | Toyota Jidosha Kabushiki Kaisha | Solid electrolyte laminate and all-solid-state battery using the same |
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