Structural change and capacity loss mechanism in orthorhombic Li/LiFeO2 system during cycling
Structural change and capacity loss mechanism in orthorhombic Li/LiFeO2 system during cycling
复制标题
正交Li/LiFeO2体系循环过程中的结构变化和容量损失机制
DOI：
10.1016/s1388-2481(03)00118-8
复制
发表时间：
2003
影响因子：
5.4
通讯作者：
Yuichi Sato
中科院分区：
文献类型：
--
作者：
Y. S. Lee;S. Sato;M. Tabuchi;C. Yoon;Yang‐Kook Sun;K. Kobayakawa;Yuichi Sato
采用固相法在低温（150 °C）下合成了正交晶系LiFeO 2。Li/LiFeO 2电池不仅具有超过150 mAh/g的高初始容量，而且在1.5和4.5 V之间的电压范围内，50次循环后具有73%的相当好的循环保持率。特别是在首次充放电过程中，Li/LiFeO 2体系的结构发生了剧烈的变化，这可能是导致Li/LiFeO 2体系容量损失的主要原因。本文报道了正交晶系Li/LiFeO 2电池在循环过程中结构变化机理的原位XRD和TEM分析结果。
Orthorhombic LiFeO2was synthesized at low temperature (150 °C) using a solid-state method. The Li/LiFeO2cell presented not only a high initial capacity of over 150 mAh/g, but also fairly good cycle retention of 73% after 50 cycles within a voltage range between 1.5 and 4.5 V. It was found that the orthorhombic phase of the LiFeO2material underwent a structural change to the spinel phase during cycling. Especially it showed severe structural changes during the first charge/discharge process, which might be the main reason to induce the capacity loss of the Li/LiFeO2system. We reported a new observation about the structural change mechanism of the orthorhombic Li/LiFeO2cell during cycling using in situ XRD and TEM analyses.