Mg ((PF6) 2) ベースの電解質システム:Mgイオン電池の開発のための電解質-電極相互作用の理解

Evan N Keyzer¹, Hugh F J Glass^1,2, Zigeng Liu¹

¹Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, U.K.

Journal of the American Chemical Society

|July 1, 2016

まとめ

マグネシウムイオン電池の研究は,Mg (PF6) 2 (CH3CN) 6電解質の合成によって進展しています. これらの新しい電解質は,高伝導性と安定性を示し,マグネシウムイオン電池におけるMg (PF6) 2に関する以前の仮定に異議を唱える.

科学分野:

電気化学
材料科学
エネルギー貯蔵

背景:

マグネシウムイオン電池はリチウムイオン電池の代替品です
Mg ((PF6) 2) ベースの電解質は,Mg電極の被動化が認識されているため,あまり研究されていません.
Mg ((PF6) 2) の塩溶液の合成や電気化学の研究は存在しなかった.

研究の目的:

Mg ((PF6) 2) ベースの電解質を合成し,特徴づけること.
Mg(PF6) 2溶液の電気化学的振る舞いを調査する.
これらの電解質の性能をMgイオン電池で評価する.

主な方法:

複合体Mg{\ PF6}2{\ CH3CN}6の合成
アセトニトリルとアセトニトリル/THF混合物におけるMg ((PF6) 2 ((CH3CN)) 6の電気化学的研究.
チェヴレル相電極によるMg電極と原型Mg電池のサイクル

主要な成果:

Mg ((PF6) 2 ((CH3CN)) 6の合成と溶液の電気化学を成功させた.
高伝導度 (最大28mS·cm−1) と電気化学的安定性 (最大4V対Mg) が達成された.
Mg電極はフッ化物形成なしに活性化され,Al電極は無活性化され,ステンレス鋼は腐食した.

結論:

前述の考えに反して,Mg−イオン電池にはMg−PF6−ベースの電解質が有効である.
合成された電解質は,Mgイオン電池のアプリケーションに高い性能と安定性を提供します.
異なる電極材料 (Al,ステンレス鋼,Mg) との電解質の互換性を明らかにした.

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