JP2000228185A - Lithium ion secondary battery - Google Patents
Lithium ion secondary batteryInfo
- Publication number
- JP2000228185A JP2000228185A JP11029766A JP2976699A JP2000228185A JP 2000228185 A JP2000228185 A JP 2000228185A JP 11029766 A JP11029766 A JP 11029766A JP 2976699 A JP2976699 A JP 2976699A JP 2000228185 A JP2000228185 A JP 2000228185A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- current collector
- electrode current
- lithium ion
- secondary battery
- 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
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title abstract description 21
- 229910001416 lithium ion Inorganic materials 0.000 title abstract description 21
- 239000007774 positive electrode material Substances 0.000 claims abstract description 10
- 239000007773 negative electrode material Substances 0.000 abstract description 13
- 229910052744 lithium Inorganic materials 0.000 abstract description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 239000011889 copper foil Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000009831 deintercalation Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000009830 intercalation Methods 0.000 description 2
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 2
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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
(57)【要約】
【課題】 低コストのリチウムイオン２次電池を提供す
る。
【解決手段】 正極集電体１０の上に正極活物質層１２
が形成され、これがセパレータ１４を介して負極集電体
１６と対向配置されており、これらが気密保持用ガスケ
ット２０で外部と遮断された外装缶１８の内部に収容さ
れている。負極集電体１６上には負極活物質層が形成さ
れておらず、リチウムイオン２次電池の低コスト化を図
ることができる。また、負極集電体１６の表面には凹凸
構造が形成されており、ここに析出したリチウム金属の
脱落を抑制できる。
(57) [Problem] To provide a low-cost lithium ion secondary battery. SOLUTION: A positive electrode active material layer 12 is provided on a positive electrode current collector 10.
This is arranged to face the negative electrode current collector 16 with the separator 14 interposed therebetween, and these are housed inside the outer can 18 which is shielded from the outside by the gasket 20 for maintaining airtightness. Since the negative electrode active material layer is not formed on the negative electrode current collector 16, the cost of the lithium ion secondary battery can be reduced. In addition, a concave-convex structure is formed on the surface of the negative electrode current collector 16, so that the lithium metal deposited on the negative electrode current collector 16 can be prevented from falling off.
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
次電池の低コスト化技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a technology for reducing the cost of a 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、
正極及び負極集電体上に、それぞれ正極及び負極活物質
層が形成され、この正極及び負極活物質層を絶縁するた
めのセパレータが正極、負極の活物質層間に配置された
構造となっている。この正極活物質層には、たとえばコ
バルト酸リチウム等が使用され、負極活物質層にはカー
ボン等が使用されている。たとえば、特開平６−３２５
７５３号公報にも、このようなリチウムイオン２次電池
の例が開示されている。2. Description of the Related Art Conventionally, lithium ion secondary batteries have
A positive electrode and a negative electrode active material layer are formed on the positive electrode and the negative electrode current collector, respectively, and a separator for insulating the positive electrode and the negative electrode active material layer is arranged between the active material layers of the positive electrode and the negative electrode. . For this positive electrode active material layer, for example, lithium cobalt oxide or the like is used, and for the negative electrode active material layer, carbon or the like is used. For example, Japanese Patent Laid-Open No. 6-325
No. 753 also discloses an example of such a lithium ion secondary battery.
【０００３】以上のようなリチウムイオン２次電池で
は、カーボン等で構成された負極活物質に、リチウムイ
オンがインターカレーション、デインターカレーション
することにより充放電が行われている。In the above-described lithium ion secondary battery, charging and discharging are performed by intercalating and deintercalating lithium ions into a negative electrode active material made of carbon or the like.
【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、リチウムイオンのイ
ンターカレーション、デインターカレーションのため
に、負極には必ずカーボン等の負極活物質が使用されて
いた。このカーボン等の負極活物質は、そのコストが高
いため、リチウムイオン２次電池の製造コストが高くな
るという問題があった。However, in the above-mentioned conventional lithium ion secondary battery, a negative electrode active material such as carbon is always used for the negative electrode for lithium ion intercalation and deintercalation. I was Since the cost of the negative electrode active material such as carbon is high, there has been a problem that the manufacturing cost of the lithium ion secondary battery increases.
【０００５】このコストを低下させるためには、負極活
物質を使用せず、負極集電体上に直接リチウムを金属と
して析出させる構成の電池とすることも考えられる。し
かし、負極集電体上にリチウムを金属として析出させる
と、析出したリチウムが負極集電体から脱離し、充放電
のために有効に使用されるリチウムの量が減るという問
題があった。In order to reduce the cost, it is conceivable to use a battery having a structure in which lithium is directly deposited as a metal on a negative electrode current collector without using a negative electrode active material. However, when lithium is deposited as a metal on the negative electrode current collector, the deposited lithium is desorbed from the negative electrode current collector, and there is a problem that the amount of lithium effectively used for charging and discharging is reduced.
【０００６】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、低コストのリチウムイオン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 low-cost lithium ion 2
Another object is to provide a battery.
【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、本発明は、リチウムイオン２次電池であって、正極
集電体と、正極集電体の上に形成された正極活物質層
と、負極集電体と、正極活物質層と負極集電体との間に
介在されたセパレータと、を備え、負極集電体の少なく
ともセパレータに対向する面に凹凸構造が形成されてい
ることを特徴とする。To achieve the above object, the present invention relates to a lithium ion secondary battery, comprising: a positive electrode current collector; and a positive electrode active material layer formed on the positive electrode current collector. And a negative electrode current collector, and a separator interposed between the positive electrode active material layer and the negative electrode current collector, and an uneven structure is formed on at least a surface of the negative electrode current collector facing the separator. It is characterized by.
【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には本発明に係るリチウムイオン２次
電池の実施形態の断面図が示される。図１において、リ
チウムイオン２次電池は、正極集電体１０の上に正極活
物質層１２が形成されており、この正極活物質層１２が
セパレータ１４を介して負極集電体１６と対向配置され
ている。上記正極集電体１０としては、たとえばアルミ
ニウム箔等が使用でき、正極活物質層１２には、たとえ
ばコバルト酸リチウム（ＬｉＣｏＯ2）等を使用するこ
とができる。また、負極集電体１６としては、たとえば
銅箔等を使用することができる。またセパレータ１４と
しては、多孔性のポリマーが使用される。FIG. 1 is a sectional view of an embodiment of a lithium ion secondary battery according to the present invention. In FIG. 1, the lithium ion secondary battery has a positive electrode active material layer 12 formed on a positive electrode current collector 10, and this positive electrode active material layer 12 is arranged to face a negative electrode current collector 16 via a separator 14. Have been. As the positive electrode current collector 10, for example, an aluminum foil or the like can be used, and for the positive electrode active material layer 12, for example, lithium cobalt oxide (LiCoO 2 ) or the like can be used. Further, as the negative electrode current collector 16, for example, a copper foil or the like can be used. As the separator 14, a porous polymer is used.
【００１０】以上のようにして構成された正極及び負極
は、外装缶１８の中に収められ、気密保持用ガスケット
２０により外部と遮断されている。外装缶１８として
は、例えばステンレス鋼等が使用できる。The positive electrode and the negative electrode constructed as described above are housed in an outer can 18 and are shielded from the outside by a gasket 20 for maintaining airtightness. As the outer can 18, for example, stainless steel can be used.
【００１１】本実施形態において特徴的な点は、負極集
電体１６上になんら負極活物質層が形成されていない点
にある。このような構成のため、本実施形態に係るリチ
ウムイオン２次電池の充電時には、リチウムが金属とし
て負極集電体１６上に析出される。この場合、負極集電
体１６が単なる銅箔のままでは、この上に析出したリチ
ウム金属が脱落してしまうので、この脱落を防止するた
めに、負極集電体１６を構成する銅箔の少なくともセパ
レータ１４に対向する面に凹凸構造を形成しておく。こ
の凹凸構造としては、たとえば銅箔に孔をあけ、ポーラ
スな構造とすることにより実現できる。また、負極集電
体１６を不織布のような編み目状の構造とすることによ
っても、あるいは銅箔の表面を所定の方法により荒らす
ことによっても凹凸構造を形成することができる。The feature of this embodiment is that no negative electrode active material layer is formed on the negative electrode current collector 16. Due to such a configuration, at the time of charging the lithium ion secondary battery according to the present embodiment, lithium is deposited on the negative electrode current collector 16 as a metal. In this case, if the negative electrode current collector 16 is a mere copper foil, the lithium metal deposited on the negative electrode current collector 16 will fall off. An uneven structure is formed on a surface facing the separator 14. This concavo-convex structure can be realized, for example, by making a hole in a copper foil to form a porous structure. Further, the uneven structure can be formed by forming the negative electrode current collector 16 into a knitted structure such as a nonwoven fabric, or by roughening the surface of the copper foil by a predetermined method.
【００１２】このように、負極集電体１６の少なくとも
セパレータ１４に対向する面に凹凸構造を形成すること
により、リチウムイオン２次電池の充電時に負極集電体
１６上に析出するリチウム金属の脱落を抑制することが
できる。これにより、充放電に寄与できるリチウムの量
が減ることを抑制できる。As described above, by forming an uneven structure on at least the surface of the negative electrode current collector 16 facing the separator 14, the lithium metal deposited on the negative electrode current collector 16 during the charging of the lithium ion secondary battery is dropped. Can be suppressed. This can suppress a decrease in the amount of lithium that can contribute to charging and discharging.
【００１３】なお、以上に述べた実施形態においては、
負極集電体１６として銅箔等が使用されているが、リチ
ウム箔を使用する場合に比べ、デンドライト（樹脂状結
晶）の生成も抑制でき、正極及び負極間の短絡を抑制す
ることもできる。In the above-described embodiment,
Although a copper foil or the like is used as the negative electrode current collector 16, generation of dendrites (resin-like crystals) can be suppressed and a short circuit between the positive electrode and the negative electrode can be suppressed as compared with the case where a lithium foil is used.
【００１４】更に、負極については、負極集電体１６を
使用せず、負極側の外装缶１８の内側表面に凹凸構造を
形成することによっても上記と同様にリチウムイオン２
次電池として機能させることができる。この場合には、
凹凸構造が形成された外装缶１８の表面にリチウム金属
が析出することになる。Further, as for the negative electrode, the concave / convex structure is formed on the inner surface of the outer can 18 on the negative electrode side without using the negative electrode current collector 16, and the lithium ion 2
It can function as a secondary battery. In this case,
Lithium metal is deposited on the surface of the outer can 18 having the uneven structure.
【００１５】以上に述べた本実施形態においては、少な
くとも負極集電体１６上の負極活物質を省略することが
できるので、リチウムイオン２次電池のコストを低減で
きるとともに、負極活物質分の重量も低減できるので、
リチウムイオン２次電池の軽量化、高出力密度化も可能
となる。また、負極活物質がないぶん、負極の抵抗を低
減できるので、高出力化も可能となる。さらに、負極集
電体１６もなくせれば、上記効果をより大きくできる。In the embodiment described above, at least the negative electrode active material on the negative electrode current collector 16 can be omitted, so that the cost of the lithium ion secondary battery can be reduced and the weight of the negative electrode active material can be reduced. Can also be reduced,
It is also possible to reduce the weight and increase the output density of the lithium ion secondary battery. Further, since there is no negative electrode active material, the resistance of the negative electrode can be reduced, so that high output can be achieved. Further, if the negative electrode current collector 16 is not provided, the above effect can be further enhanced.
【００１６】[0016]
【発明の効果】以上説明したように、本発明によれば、
負極活物質層をなくすことにより、リチウムイオン２次
電池の低コスト化を図ることができる。また、負極集電
体表面に凹凸構造を形成することにより、ここに析出し
たリチウム金属が脱落することを抑制することができ
る。As described above, according to the present invention,
By eliminating the negative electrode active material layer, the cost of the lithium ion secondary battery can be reduced. In addition, by forming the concavo-convex structure on the surface of the negative electrode current collector, it is possible to prevent the lithium metal deposited here from falling off.
【図１】 本発明に係るリチウムイオン２次電池の実施
形態の断面図である。FIG. 1 is a sectional view of an embodiment of a lithium ion secondary battery according to the present invention.
１０ 正極集電体、１２ 正極活物質層、１４ セパレ
ータ、１６ 負極集電体、１８ 外装缶、２０ 気密保
持用ガスケット。Reference Signs List 10 positive electrode current collector, 12 positive electrode active material layer, 14 separator, 16 negative electrode current collector, 18 outer can, 20 airtight gasket.
Claims (1)
レータと、を備え、 前記負極集電体の少なくとも前記セパレータに対向する
面に凹凸構造が形成されていることを特徴とするリチウ
ムイオン２次電池。A positive electrode current collector; a positive electrode active material layer formed on the positive electrode current collector; a negative electrode current collector; and a positive electrode current collector interposed between the positive electrode active material layer and the negative electrode current collector. A negative electrode current collector, wherein a concave-convex structure is formed on at least a surface of the negative electrode current collector facing the separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11029766A JP2000228185A (en) | 1999-02-08 | 1999-02-08 | Lithium ion secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11029766A JP2000228185A (en) | 1999-02-08 | 1999-02-08 | Lithium ion secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000228185A true JP2000228185A (en) | 2000-08-15 |
Family
ID=12285181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11029766A Pending JP2000228185A (en) | 1999-02-08 | 1999-02-08 | Lithium ion secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000228185A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100462781B1 (en) * | 2002-06-12 | 2004-12-20 | 삼성에스디아이 주식회사 | Lithium battery without anode active material and process for preparing the same |
| WO2008059717A1 (en) * | 2006-11-15 | 2008-05-22 | Toyota Jidosha Kabushiki Kaisha | Method for manufacturing lithium rechargeable battery, and lithium rechargeable battery |
| KR101934544B1 (en) * | 2016-07-01 | 2019-01-02 | 주식회사 유뱃 | Electrochemical energy device with high energy density and method of fabricating the same |
| WO2019050356A1 (en) * | 2017-09-11 | 2019-03-14 | 주식회사 유뱃 | Electrochemical element and manufacturing method therefor |
| CN110556512A (en) * | 2018-05-31 | 2019-12-10 | 松下知识产权经营株式会社 | Lithium secondary battery |
| US11349148B2 (en) | 2018-01-05 | 2022-05-31 | Samsung Electronics Co., Ltd. | Anodeless lithium metal battery and method of manufacturing the same |
| US11355778B2 (en) | 2018-01-05 | 2022-06-07 | Samsung Electronics Co., Ltd. | Anodeless lithium metal battery and method of manufacturing the same |
-
1999
- 1999-02-08 JP JP11029766A patent/JP2000228185A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100462781B1 (en) * | 2002-06-12 | 2004-12-20 | 삼성에스디아이 주식회사 | Lithium battery without anode active material and process for preparing the same |
| WO2008059717A1 (en) * | 2006-11-15 | 2008-05-22 | Toyota Jidosha Kabushiki Kaisha | Method for manufacturing lithium rechargeable battery, and lithium rechargeable battery |
| DE112007002732T5 (en) | 2006-11-15 | 2009-09-24 | Toyota Jidosha Kabushiki Kaisha, Toyota-shi | Process for producing a lithium battery and lithium battery |
| US8404386B2 (en) | 2006-11-15 | 2013-03-26 | Toyota Jidosha Kabushiki Kaisha | Method of manufacturing lithium secondary battery and lithium secondary battery |
| DE112007002732B4 (en) * | 2006-11-15 | 2016-09-15 | Toyota Jidosha Kabushiki Kaisha | Process for producing a lithium battery and lithium battery |
| KR101934544B1 (en) * | 2016-07-01 | 2019-01-02 | 주식회사 유뱃 | Electrochemical energy device with high energy density and method of fabricating the same |
| WO2019050356A1 (en) * | 2017-09-11 | 2019-03-14 | 주식회사 유뱃 | Electrochemical element and manufacturing method therefor |
| US11349148B2 (en) | 2018-01-05 | 2022-05-31 | Samsung Electronics Co., Ltd. | Anodeless lithium metal battery and method of manufacturing the same |
| US11355778B2 (en) | 2018-01-05 | 2022-06-07 | Samsung Electronics Co., Ltd. | Anodeless lithium metal battery and method of manufacturing the same |
| US12334548B2 (en) | 2018-01-05 | 2025-06-17 | Samsung Electronics Co., Ltd. | Anodeless lithium metal battery and method of manufacturing the same |
| CN110556512A (en) * | 2018-05-31 | 2019-12-10 | 松下知识产权经营株式会社 | Lithium secondary battery |
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