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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158
バナジウム・リチウム二次電池、ニオブ・リチウム二次電池
4-15
リチウム合金を用いた
リチウム二次電池②
正極に五酸化バナジウムを活用
バナジウム・リチウム二次電池（VL）とは、負極活物質にリチウム・
アルミニウム合金、正極活物質に五酸化バナジウム（V
2
O
5
）を用いたコイ
ン形の二次電池です（図4-29）。層状構造を持つ五酸化バナジウムは、リ
チウムイオンとインターカレーション反応します。正極の化学反応は次の
ようになります。
正極：V
2
O
5
+xLi
＋
+xe
扌Li
x
V
2
O
5
公称電圧3V と高く、サイクル寿命も大きくて、自己放電も少ないため、
PCやスマートフォンなどの通信機器のメモリーバックアップ電源、火災
報知器などの電源に使われています。
正極に五酸化ニオブを活用
ニオブ・リチウム二次電池（NBL）とは、負極活物質にリチウム・アル
ミニウム合金、正極活物質に五酸化ニオブ（Nb
2
O
5
）を用いたコイン形の
二次電池です（図4-30）。五酸化ニオブもリチウムイオンとインターカレ
ーション反応します。
公称電圧2Vとなり、バナジウム・リチウム電池より低いのですが、自
己放電率が同じぐらいで、液漏れしにくいという利点があり、スマートフ
ォンの電源、各種電子機器の補助電源やメモリーバックアップ電源として
使用されています。
ニオブ系リチウム二次電池には、五酸化ニオブを負極活物質に用いた電
池もあります。例えば負極に五酸化ニオブ、正極活物質に五酸化バナジウ
ムを用いたバナジウム・ニオブ・リチウム二次電池が開発されています。 ...
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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.