In Situ TEM Observation of Local Phase Transformation in a Rechargeable LiMn2O4 Nanowire Battery

详细信息    查看全文

• 作者：Soyeon Lee ; Yoshifumi Oshima ; Eiji Hosono ; Haoshen Zhou ; Kyungsu Kim ; Hansen M. Chang ; Ryoji Kanno ; Kunio Takayanagi
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：November 21, 2013
• 年：2013
• 卷：117
• 期：46
• 页码：24236-24241
• 全文大小：303K
• 年卷期：v.117,no.46(November 21, 2013)
• ISSN：1932-7455

文摘

We developed a 鈥渘anobattery鈥?consisting of LiMn₂O₄ nanowires, ionic liquid electrolyte, and Li₄Ti₅O₁₂ crystals and performed in situ transmission electron microscope observation during charge and discharge cycles. The LiMn₂O₄ nanowire was found to be changed into the tetragonal phase at the interface region with electrolyte during the discharge process of the 4 V reaction (vs Li/Li⁺). This result is explained by the lithium accumulation due to the different local lithium diffusion rates: the lithium ions were inserted into the nanowire at a higher rate than they diffused toward the bulk side of the nanowire. We also found that the LiMn₂O₄ nanowire cathode was restored to be cubic phase without any fracture in the charge process. No fracture during the cubic-tetragonal transition is promising for the long-lifetime battery with LiMn₂O₄ nanowire cathode.