Lithium insertion in lithium iron molybdate

详细信息	查看全文 | 推荐本文 |

• 作者：M. Devi ; U.V. Varadaraju ; ^{varada@iitm.ac.in}
• 关键词：Lithium insertion ; Iron redox couple ; Double molybdate ; Channel structure
• 刊名：Electrochemistry Communications
• 出版年：2012
• 期刊代码：29_13882481
• 类别：ch
• 出版时间：2012
• 卷：18
• 期：Complete
• 页码：112-115
• 文件大小：844 K

摘要

We report here, for the first time, facile and reversible insertion/extraction of lithium in LiFe(MoO₄)₂. A biphasic reaction is observed in the compositional range 0 < x < 0.9 in Li_1 + xFe(MoO₄)₂ with a remarkably flat plateau at an average voltage of 2.68 V due to the redox couple Fe^3 +/Fe^2 +. An irreversible structural change was associated with lithium insertion. The plateau behavior is reversible with negligible hysteresis (螖dQ/dV = 0.05 V) and 100%Faradaic efficiency. A reversible capacity of 63 mAh/g is obtained in the voltage window 3.0-2.5 V. When reduction of Mo^6 + is also accessed by cycling in the voltage window 3.0-1.0 V, a reversible capacity of ~ 180 mAh/g was obtained at the end of 20 cycles at C/5 rate.