Mechanism of the electrochemical insertion of lithium into LiMn2O4 spinels
Mechanism of the electrochemical insertion of lithium into LiMn2O4 spinels
复制标题
DOI：
10.1149/1.1838285
复制
发表时间：
1998-02-01
影响因子：
3.9
通讯作者：
Farrington, GC
中科院分区：
文献类型：
--
作者：
Liu, W;Kowal, K;Farrington, GC
LiMn 2 O 4基尖晶石作为锂离子电池正极材料得到了广泛的研究。我们的研究表明，通过使用Pechini工艺，可以通过选择性掺杂调整合成条件和组成来显着改善这些材料的性能。本文报道了中子和非原位X射线衍射研究的结果进行检查的结构变化，发生在锂离子插入到各种LixMn 2 O 4组合物。看来，锂离子的有序嵌入发生在锂浓度范围为0.15-0.35，其次是二级相变时，锂人口接近0.5，导致随机锂插入到一个单尖晶石相从x=0.5到1.0。
LiMn2O4-based spinels have been extensively studied as positive electrode materials for Lithium-ion batteries. Our investigations have shown that, by using the Pechini process, the performance of these materials can be improved significantly through adjustments to the synthesis conditions and composition by means of selective doping. This paper reports the results of neutron and ex situ X-ray diffraction studies performed to examine the structural changes that occur during lithium ion insertion into various LixMn2O4 compositions. It appears that an ordering intercalation of lithium ions occurs in the lithium concentration range of 0.15-0.35, followed by a second-order phase transformation when the lithium population is close to 0.5, leading to a random lithium insertion into a single-spinel phase from x=0.5 to 1.0.