JP2000228184A - Lithium ion secondary battery - Google Patents
Lithium ion secondary batteryInfo
- Publication number
- JP2000228184A JP2000228184A JP11027005A JP2700599A JP2000228184A JP 2000228184 A JP2000228184 A JP 2000228184A JP 11027005 A JP11027005 A JP 11027005A JP 2700599 A JP2700599 A JP 2700599A JP 2000228184 A JP2000228184 A JP 2000228184A
- Authority
- JP
- Japan
- Prior art keywords
- active material
- electrode active
- material layer
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Physical Vapour Deposition (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はリチウムイオン２次
電池、特にリチウムイオン２次電池の高出力化のための
改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium ion secondary battery, and more particularly to an improvement for increasing the output of a lithium ion secondary battery.
【０００２】[0002]
【従来の技術】従来より、リチウムイオン２次電池は、
正極集電体上にコバルト酸リチウム（ＬｉＣｏＯ2）等
の活物質からなる正極活物質層が形成され、負極集電体
上に黒鉛等の負極活物質層が形成され、これら正、負極
の活物質がセパレータを介して対向配置される構成とな
っている。2. Description of the Related Art Conventionally, lithium ion secondary batteries have
A positive electrode active material layer made of an active material such as lithium cobalt oxide (LiCoO 2 ) is formed on the positive electrode current collector, and a negative electrode active material layer such as graphite is formed on the negative electrode current collector. The structure is such that the substances are arranged to face each other with the separator interposed therebetween.
【０００３】たとえば、特開平６−３２５７５３号公報
にも、上述のようなリチウムイオン２次電池において、
負極活物質である黒鉛に酸化銅を混合し、この酸化銅が
電気化学的に還元されたものに、可逆的に進行するリチ
ウムと銅の複合酸化物ができることを利用して高容量化
を図る技術が開示されている。For example, Japanese Patent Application Laid-Open No. 6-325753 discloses that a lithium ion secondary battery as described above includes:
Achieve high capacity by mixing copper oxide with graphite, which is the negative electrode active material, and utilizing the fact that this copper oxide is electrochemically reduced to form a composite oxide of lithium and copper that progresses reversibly. Techniques are disclosed.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記従来のリ
チウムイオン２次電池においては、正極及び負極の活物
質層の厚み方向に抵抗が存在するので、高出力化を図る
には一定の限界があった。これを解決するために、上述
した従来技術のように、活物質中に金属粒子を分散させ
ることにより抵抗を低下させることも考えられるが、こ
の場合は電極重量が重くなるので、高出力密度化には不
利であるという問題があった。However, in the above-mentioned conventional lithium ion secondary battery, resistance exists in the thickness direction of the active material layers of the positive electrode and the negative electrode. there were. In order to solve this, it is conceivable to lower the resistance by dispersing metal particles in the active material as in the above-described conventional technology. Had the disadvantage of being disadvantaged.
【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、電極活物質層の厚み方向の抵
抗が低減され、高出力化されたリチウムイオン２次電池
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 lithium ion secondary battery in which the resistance in the thickness direction of an electrode active material layer is reduced and the output is increased. It is in.
【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、正極集電体と、正極活物質層と、セパレ
ータと、負極活物質層と、負極集電体と、が順次積層さ
れたリチウムイオン２次電池であって、正極活物質層中
に、正極活物質層と略同じ厚さの導電体が分散されてい
ることを特徴とする。In order to achieve the above object, the present invention provides a positive electrode current collector, a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector in order. A stacked lithium ion secondary battery, wherein a conductor having substantially the same thickness as the positive electrode active material layer is dispersed in the positive electrode active material layer.
【０００７】また、正極集電体と、正極活物質層と、セ
パレータと、負極活物質層と、負極集電体と、が順次積
層されたリチウムイオン２次電池であって、負極活物質
層中に、負極活物質層と略同じ厚さの導電体が分散され
ていることを特徴とする。A lithium ion secondary battery in which a positive electrode current collector, a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector are sequentially laminated, wherein the negative electrode active material layer A conductive material having substantially the same thickness as the negative electrode active material layer is dispersed therein.
【０００８】また、上記リチウムイオン２次電池におい
て、導電体は、表面に金属メッキが施されたポリマービ
ーズであることを特徴とする。[0008] In the above-mentioned lithium ion secondary battery, the conductor is a polymer bead whose surface is plated with metal.
【０００９】[0009]
【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.
【００１０】図１には、本発明に係るリチウムイオン２
次電池の断面図が示される。図１において、リチウムイ
オン２次電池１０は、正極集電体１２の上にコバルト酸
リチウム等の正極活物質層１４が結着剤によって結着さ
れている。また、負極集電体１６の上には、カーボン等
の負極活物質層１８が結着剤によって結着されている。
このように形成された正極活物質層１４と負極活物質層
１８とは、セパレータ２０を介して対向配置されてい
る。すなわち、正極集電体１２と正極活物質層１４とセ
パレータ２０と負極活物質層１８と負極集電体１６とが
順次積層された構造となっている。FIG. 1 shows a lithium ion 2 according to the present invention.
A sectional view of the secondary battery is shown. In FIG. 1, a lithium ion secondary battery 10 has a positive electrode active material layer 14 such as lithium cobalt oxide bound on a positive electrode current collector 12 with a binder. Further, on the negative electrode current collector 16, a negative electrode active material layer 18 such as carbon is bound by a binder.
The positive electrode active material layer 14 and the negative electrode active material layer 18 thus formed are arranged to face each other with the separator 20 interposed therebetween. That is, the positive electrode current collector 12, the positive electrode active material layer 14, the separator 20, the negative electrode active material layer 18, and the negative electrode current collector 16 are sequentially laminated.
【００１１】本発明において特徴的な点は、正極活物質
層１４と負極活物質層１８の中に、これらの膜厚とほぼ
同等の粒径を持ち、表面に金属めっき２２が施されたポ
リマービーズ２４が分散されている点にある。この場合
の金属めっき２２には、たとえばニッケル等を使用する
ことができる。このように、金属めっき２２を施したポ
リマービーズ２４を分散させることにより、正極活物質
層１４及び負極活物質層１８の膜厚方向の抵抗を大幅に
低減することができる。このため、リチウムイオン２次
電池の高出力化を図ることができる。A characteristic feature of the present invention is that the positive electrode active material layer 14 and the negative electrode active material layer 18 have a polymer particle having a particle size substantially equal to the film thickness and a metal plating 22 applied to the surface. The point is that the beads 24 are dispersed. For the metal plating 22 in this case, for example, nickel or the like can be used. In this way, by dispersing the polymer beads 24 on which the metal plating 22 has been applied, the resistance in the thickness direction of the positive electrode active material layer 14 and the negative electrode active material layer 18 can be significantly reduced. Therefore, it is possible to increase the output of the lithium ion secondary battery.
【００１２】また、正極及び負極を製造する際には、プ
レスにより電極の活物質の密度を調整する必要がある
が、ポリマービーズ２４が存在すると、プレス圧力のば
らつきを吸収でき、正極活物質層１４及び負極活物質層
１８の膜厚と密度のばらつきが出にくくなるという利点
もある。Further, when manufacturing the positive electrode and the negative electrode, it is necessary to adjust the density of the active material of the electrode by pressing. However, when the polymer beads 24 are present, the dispersion of the pressing pressure can be absorbed, and the positive electrode active material layer There is also an advantage that variations in film thickness and density of the negative electrode active material layer 14 and the negative electrode active material layer 18 hardly occur.
【００１３】なお、以上の説明では、正極活物質層１４
及び負極活物質層１８の中にポリマービーズ２４を分散
する構成としているが、このポリマービーズ２４は必ず
しも球形である必要はない。正極活物質層１４及び負極
活物質層１８と略同じ厚さのもので、電極の厚さ方向の
抵抗を低減できるものであればよい。In the above description, the positive electrode active material layer 14
In addition, the polymer beads 24 are dispersed in the negative electrode active material layer 18, but the polymer beads 24 do not necessarily have to be spherical. Any material may be used as long as it has substantially the same thickness as the positive electrode active material layer 14 and the negative electrode active material layer 18 and can reduce the resistance in the thickness direction of the electrode.
【００１４】[0014]
【発明の効果】以上説明したように、本発明によれば、
正極及び負極の活物質層の厚み方向の抵抗を低減でき、
リチウムイオン２次電池の高出力化を図ることができ
る。As described above, according to the present invention,
The resistance in the thickness direction of the active material layers of the positive electrode and the negative electrode can be reduced,
High output of the lithium ion secondary battery can be achieved.
【図１】 本発明に係るリチウムイオン２次電池の断面
図である。FIG. 1 is a sectional view of a lithium ion secondary battery according to the present invention.
１０ リチウムイオン２次電池、１２ 正極集電体、１
４ 正極活物質層、１６ 負極集電体、１８ 負極活物
質層、２０ セパレータ、２２ 金属めっき、２４ ポ
リマービーズ。10 Lithium ion secondary battery, 12 Positive electrode current collector, 1
4 positive electrode active material layer, 16 negative electrode current collector, 18 negative electrode active material layer, 20 separator, 22 metal plating, 24 polymer beads.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4F006 AA11 AA31 AB73 BA07 CA08 EA01 4K029 AA11 BA12 BC03 5H003 AA01 BA07 BB14 BC05 5H014 AA02 AA06 CC01 CC07 EE03 EE05 5H029 AJ06 AK03 AL06 AM03 AM04 AM06 AM07 BJ04 BJ13 CJ24 DJ07 DJ08 EJ01 EJ12 HJ12 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4F006 AA11 AA31 AB73 BA07 CA08 EA01 4K029 AA11 BA12 BC03 5H003 AA01 BA07 BB14 BC05 5H014 AA02 AA06 CC01 CC07 EE03 EE05 5H029 AJ06 AK03 AL06 AM03 AM04 AM06 DJ07 BJ04 DJ06 HJ12
Claims (3)
ータと、負極活物質層と、負極集電体と、が順次積層さ
れたリチウムイオン２次電池であって、前記正極活物質
層中に、前記正極活物質層と略同じ厚さの導電体が分散
されていることを特徴とするリチウムイオン２次電池。1. A lithium ion secondary battery in which a positive electrode current collector, a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector are sequentially laminated, wherein the positive electrode active material A lithium ion secondary battery, wherein a conductor having substantially the same thickness as the positive electrode active material layer is dispersed in the layer.
ータと、負極活物質層と、負極集電体と、が順次積層さ
れたリチウムイオン２次電池であって、前記負極活物質
層中に、前記負極活物質層と略同じ厚さの導電体が分散
されていることを特徴とするリチウムイオン２次電池。2. A lithium ion secondary battery in which a positive electrode current collector, a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector are sequentially laminated, wherein the negative electrode active material A lithium ion secondary battery, wherein a conductor having substantially the same thickness as the negative electrode active material layer is dispersed in the layer.
イオン２次電池において、前記導電体は、表面に金属メ
ッキが施されたポリマービーズであることを特徴とする
リチウムイオン２次電池。3. The lithium ion secondary battery according to claim 1, wherein the conductor is a polymer bead having a surface plated with metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02700599A JP3632482B2 (en) | 1999-02-04 | 1999-02-04 | Lithium ion secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02700599A JP3632482B2 (en) | 1999-02-04 | 1999-02-04 | Lithium ion secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000228184A true JP2000228184A (en) | 2000-08-15 |
| JP3632482B2 JP3632482B2 (en) | 2005-03-23 |
Family
ID=12209016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02700599A Expired - Fee Related JP3632482B2 (en) | 1999-02-04 | 1999-02-04 | Lithium ion secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3632482B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6942824B1 (en) | 2002-05-22 | 2005-09-13 | Western Digital (Fremont), Inc. | UV curable and electrically conductive adhesive for bonding magnetic disk drive components |
-
1999
- 1999-02-04 JP JP02700599A patent/JP3632482B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6942824B1 (en) | 2002-05-22 | 2005-09-13 | Western Digital (Fremont), Inc. | UV curable and electrically conductive adhesive for bonding magnetic disk drive components |
| US6947258B1 (en) * | 2002-05-22 | 2005-09-20 | Western Digital (Fremont), Inc. | UV curable and electrically conductive adhesive for bonding magnetic disk drive components |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3632482B2 (en) | 2005-03-23 |
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