التفاصيل البيبلوغرافية
| العنوان: |
The High Performance of Crystal Water Containing ManganeseBirnessite Cathodes for Magnesium Batteries. |
| المؤلفون: |
Kwan Woo Nam1, Sangryun Kim1, Soyeon Lee1, Michael Salama1, Ivgeni Shterenberg1, Yossi Gofer1, Joo-Seong Kim1, Eunjeong Yang1, Chan Sun Park1, Ju-Sik Kim1, Seok-Soo Lee1, Won-Seok Chang1, Seok-Gwang Doo1, YongNam Jo1, Yousung Jung1, Doron Aurbach1, Jang Wook Choi1 |
| المصدر: |
Nano Letters. Jun2015, Vol. 15 Issue 6, p4071-4079. 9p. |
| مصطلحات موضوعية: |
*MANGANESE, *ELECTROCHEMICAL electrodes, *MAGNESIUM, *STORAGE batteries, *ENERGY storage |
| مستخلص: |
Rechargeable magnesium batterieshave lately received great attentionfor large-scale energy storage systems due to their high volumetriccapacities, low materials cost, and safe characteristic. However,the bivalency of Mg2+ions has made it challenging to findcathode materials operating at high voltages with decent (de)intercalationkinetics. In an effort to overcome this challenge, we adopt an unconventionalapproach of engaging crystal water in the layered structure of BirnessiteMnO2because the crystal water caneffectively screen electrostatic interactions between Mg2+ions and the host anions. The crucial role of the crystal waterwas revealed by directly visualizing its presence and dynamic rearrangementusing scanning transmission electron microscopy (STEM). Moreover,the importance of lowering desolvation energy penalty at the cathode–electrolyteinterface was elucidated by working with water containing nonaqueouselectrolytes. In aqueous electrolytes, the decreased interfacial energypenalty by hydration of Mg2+allows BirnessiteMnO2to achieve a large reversible capacity (231.1 mAhg–1) at high operating voltage (2.8 V vs Mg/Mg2+) with excellent cycle life (62.5% retention after 10000 cycles), unveiling the importance of effectivecharge shielding in the host and facile Mg2+ions transferthrough the cathode’s interface. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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