March 2023
Intermediate
240 pages
7h 3m
Japanese
Content preview from 図解まるわかり 電池のしくみ
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136
画期的な電池反応による充電
イオンの往復、電極の溶解・析出、ロッキングチェア型電池
4-4
インターカレーション反応による充電反応
リチウムイオン電池の充電時には、放電時と逆の反応が起こります（図
4-7）。正極活物質に吸蔵されていたリチウムは電子と一緒に放出され、
酸化されてリチウムイオンとなります（酸化反応）。電解質中を負極側に
移動してきたリチウムイオンは、負極活物質に吸蔵され、導線を移動して
きた電子を受け取り還元されます（還元反応）。
コバルト酸リチウム電池の充電反応
コバルト酸リチウムイオン電池の充電反応は次のようになります（図4-8）。
正極活物質コバルト酸リチウムに吸蔵されていた
n
個のリチウムイオン
と電子が放出されます（酸化反応）。
n
個のリチウムイオンを放出したコ
バルト酸リチウムには、（1-
n
）個のリチウムが残ります。電解質中を移
動してきた
n
個のリチウムイオンは、負極活物質の黒鉛に吸蔵され、導線
を移動してきた電子を受け取ります（還元反応）。
正極：LiCoO
2
→
n
e
+
n
Li
＋
+Li
（1
n
）
CoO
2
負極：6C+
n
Li
＋
+
n
e
→Li
n
C
6
反応全体：6C+LiCoO
2
→Li
n
C
6
+Li
（1
n
）
CoO
2
イオンの往復
リチウムイオンのインターカレーション反応では、イオンの往復だけ
で、金属リチウムは生じないのでデンドライトの問題（4-1）もなく、安
全性が高くなりました。電極の溶解・析出を伴わないので、充放電の効率
もよくなり、しかもメモリー効果 ...
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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.