March 2023
Intermediate
240 pages
7h 3m
Japanese
Content preview from 図解まるわかり 電池のしくみ
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
216
化学反応なしに電気をためて
活用する蓄電装置②
6-9
陽 イオン、 陰 イオン
電気二重層キャパシタの構造
電気二重層キャパシタは、1957 年にゼネラルエレクトリック社（米）で
開発され、1987 年に日本で世界に先駆けて実用化されました。電池構造
は、化学電池と同様に、2 つの電極と集電体、電解質、セパレータとなり
ます。電極には、2 つとも同じ材料が使われ、多孔質の活性炭素などを用
います。電解質は二次電池と同様に、有機溶媒や水溶液など用途によって
使い分けられます。円筒形、箱形、コイン形とさまざまな形状があります。
キャパシタの充放電のしくみ
電気二層キャパシタの2 つの電極に外部電源から電気を流すと、電極と
電解質の界面に電気がたまり、電気二重層が形成されます（6-8）。この
とき、キャパシタが充電された状態となります（図6-19）。
充電されたキャパシタの回路に電球をつなぐと、負極の電子が回路に流
れ、陽イオンが界面を離れて、電解質中に拡散します。正極では、負極か
ら電子が流れて来て、正孔がなくなり、陰イオンが界面を離れて、電解質
中に拡散します。これがキャパシタの放電した状態です。
小型電子機器の中で活躍中
電気二層キャパシタの充放電は、化学反応を起こさず、電解質のイオン
の移動のみです。充放電を繰り返しても性能劣化はほとんど起こらず、サ
イクル寿命も数百回に及びます。また充放電時間が短く、使用可能な温度
範囲も広いという利点があります。一方でエネルギー密度が小さい、自己
放電が比較的大きい、 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.