The possibility of manganese disorder in LiMnPO4 and its effect on the electrochemical activity
The possibility of manganese disorder in LiMnPO4 and its effect on the electrochemical activity
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LiMnPO4中锰无序的可能性及其对电化学活性的影响
DOI：
10.1016/j.elecom.2008.05.010
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发表时间：
2008-07-01
影响因子：
5.4
通讯作者：
Wei, Shiqiang
中科院分区：
文献类型：
--
作者：
Fang, Haisheng;Pan, Zhiyun;Wei, Shiqiang
采用水热法合成了正交结构的LiMnPO 4。利用X射线粉末衍射和X射线吸收精细结构分析研究了LiMnPO 4中锰无序化的可能性。提出了水热合成LiMnPO 4的富锰模型。结果表明，提高反应温度可以抑制Mn ~（2+）在Li ~+位上的无序程度，提高电化学活性。这些观察结果的基础上解释的富锰的模型，其中的无序Mn 2+的Li+网站可能作为一个障碍，在一维锂离子传输路径，从而降低了在低温下制备的LiMnPO 4的电化学活性。(C)2008 Elsevier B. V.保留所有权利。
Orthorhombic structured LiMnPO4 was synthesized by a hydrothermal method. The possibility of manganese disorder in LiMnPO4 was studied using powder X-ray diffraction and X-ray absorption fine structure analysis. A manganese-rich model was proposed for the hydrothermally synthesized LiMnPO4. It is found that the extent of Mn2+ disorder on the Li+ sites was suppressed by increasing the reaction temperature, which led to an enhanced electrochemical activity. These observations are explained on the basis of the manganese-rich model, in which the disordered Mn2+ on the Li+ sites may act as a blockage in one-dimensional lithium ion transport pathway, thus reducing the electrochemical activity of the LiMnPO4 prepared at low temperatures. (C) 2008 Elsevier B.V. All rights reserved.