プルシアンブルー類似体（Prussian blue analogs）

筑波大学の守友教授は、最速１秒で放電できるリチウムイオン電池の正極材料を開発した。一度にたくさんの電子を流せる「プルシアンブルー類似体」を電極に応用した。原料が安価で劣化しにくいため、低価格なリチウムイオン電池の実現が見込める。最適な負極材やデバイスの開発が進めば、携帯端末や電気自動車（ＥＶ）の高速・大容量充電が期待できる。成果は応用物理学会誌「アプライド・フィジックス・エクスプレス」に１５日掲載される。
　従来の正極材にはリチウムコバルト酸化物といった酸化物系材料が使われているが、一度に放出できる電流量が小さく、充放電の速度に限界がある点が課題。
　インジウム・スズ酸化物（ＩＴＯ）の透明電極表面に、メッキの要領でマンガン鉄シアノ錯体を析出させた。結晶構造が３次元で電子の通るすき間が大きく、多くの電流を流せる。今後、高速・大容量充電が必要条件になっていくことですから最適な負電極を特定し実用化に近づけてほしいですね。


Moritomo professor at the University of Tsukuba has developed a cathode material for lithium-ion batteries can be discharged in one second fastest. Electrons can flow was applied to the electrode at the same time a lot of "Prussian blue analogues". Hardly degraded because inexpensive raw materials, the realization of low-cost lithium-ion battery can be expected. The program develops the negative electrode material and device optimal charging of high-speed, high-capacity (EV) and electric vehicles can be expected the mobile terminal. Results will be published 15 days, "Applied Physics Express," Journal of Applied Physics.
To the conventional cathode material has been used oxide materials such as lithium cobalt oxide system, the amount of current can be discharged at a time is small, the challenge is there is a limit point on the speed of charging and discharging.
On the surface of the transparent electrode of indium tin oxide (ITO), was precipitated manganese iron cyano complexes in the manner of plating. Crystal structure of the electron passing through a gap in three dimensions is large enough to carry a lot of current. Future, I want as close to commercialization to identify optimal from the negative electrode is high-speed, high-capacity charging will become a requirement.