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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146
リン酸 鉄リチウムイオン電 池 、リン酸 鉄リチウム 、オリビン型 結 晶 構 造
4-9
世界的電気自動車メーカーに
選ばれたリチウムイオン電池
安全性の高いオリビン型
リン酸鉄リチウム電池（LFP）とは、負極活物質に黒鉛、正極活物質に
リン酸鉄リチウム（LiFePO
4
）を用いた電池です。
正極活物質のリン酸鉄リチウムの最大の利点は、酸素とリンが強く結合
した、オリビン型結晶構造であることです（図 4-17）。そのためリチウム
のインターカレーション反応による結晶の変形が起こらず、電気自動車に
必要不可欠な急速充放電が可能となり、自己放電が小さいため長期保存が
可能で、サイクル寿命も長めです。さらに発火原因となる酸素が放出され
ないので、含まれる酸素原子が容易に離れて燃焼・爆発を起こすマンガン
系（4-8）よりも、電池の熱的安定性がさらに高くなります。
何より主な原材料が鉄とリンであるため、マンガン系よりも安価に製造
でき、資源の枯渇や環境の問題がないことも魅力です。電池反応は次のよ
うになります。
負極：Li
x
C
6
扌6C+
x
Li
＋
+
x
e
正極：Li
1
x
FePO
4
+
x
Li
＋
+
x
e
扌LiFePO
4
反応全体：Li
x
C
6
+Li
1
x
FePO
4
扌6C+LiFePO
4
話題の企業の採用で大注目！
一方で、リン酸鉄リチウム電池には、電圧とエネルギー密度が低いとい
う欠点がありました。これはリン酸鉄リチウムの導電性が低いためで、瞬
間的に大きなパワーを必要とする電気自動車には不向きだと指摘されてい ...
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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.
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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.