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高度なMg電池の電解質溶液におけるAlとMgの異なった作用

Kimberly A See¹, Karena W Chapman², Lingyang Zhu¹

¹Department of Chemistry, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.

Journal of the American Chemical Society

|December 5, 2015

まとめ

マグネシウム電池は持続可能なエネルギー貯蔵を提供しますマグネシウムアルミニウム塩化物複合体 (MACC) のコンディショニングは,特定の複合体とフリー塩化イオンを形成することによって,マグネシウム沈殿を活性化します.

科学分野:

材料科学
電気化学
無機化学

背景:

マグネシウム電池はリチウムイオン電池の持続可能な代替品であり,より大きな容量を提供します.
マグネシウムアルミニウム塩化物複合体 (MACC) の電解質は,高堆積効率と安定性により,Mg電池にとって有望である.
精製されたMACC電解質は,Mgの堆積には無効であり,活性化プロセスが必要である.

研究の目的:

条件づけられたMACC電解質の電解を担当する活性マグネシウム複合体を特定する.
MACC電解質コンディショニング中のアルミニウムとマグネシウムの異種化との関係を解明する.
マグネシウム電解の強化における塩化イオンの役割を理解する.

主な方法:

振動分析のためのラマン光譜と表面強化ラマン光譜 (SERS).
(27) Alと (35) Clの核磁気共振 (NMR) スペクトロスコーピーは,元素の種化のために使用されます.
構造的な洞察のためのペア分布関数 (PDF) 分析.

主要な成果:

調製されたMACC電解質と調製されたMACC電解質の間で,大量種化の有意な変化が観察された.
条件づけられたMACCにおける活性Mg複合体は,おそらく[Mg2 ((μ-Cl) 3·6THF)) ((+)) 複合体である.
溶液中の塩素イオン (Cl-) を生成する.

結論:

コンディショニングはMACCの電解質を変化させ,効率的なMgの堆積を可能にします.
[Mg2 ((μ-Cl) 3·6THF)) 複合体は,Mg電位化のための主要な活性種として特定されています.
自由な塩化物イオンは,電極表面に吸収され,Mgの堆積を促進します.

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