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首页> 外文期刊>Physica, B. Condensed Matter >On the observation of a huge lattice contraction and crystal habit modifications in LiMn2O4 prepared by a fuel assisted solution combustion
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On the observation of a huge lattice contraction and crystal habit modifications in LiMn2O4 prepared by a fuel assisted solution combustion

机译：在燃料辅助溶液燃烧制备的LiMn2O4中观察到巨大的晶格收缩和晶体习性改变

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Two batches of poly-crystalline lithium manganate were prepared by a fuel assisted solution combustion method. LiMn2O4(S) was prepared using starch as the fuel and LiMn2O4(P) was prepared using poly vinyl alcohol (PVA) as the fuel. XRD studies indicated a significant and consistent shift in the 20 values of all the hkl peaks to higher values in LiMn2O4(P) compared to LiMn2O4(S) indicating a lattice contraction in the former. TG/DTA studies indicated a higher formation temperature (similar to 25 degrees C higher) for LiMn2O4(P). The higher formation temperature most likely promotes the oxidation of some Mn3+ to Mn4+ with a lower ionic radius causing a lattice contraction. This hypothesis is confirmed through XPS studies which indicated the presence of a higher fraction of Mn4+ in LiMn2O4(P) than that present in LiMn2O4(S). A crystal shape algorithm was used to generate the crystal habits of lithium manganate from their XRD data leading to an understanding on the exposed hkl planes in these materials. From the atomic arrangement on the exposed hkl planes it is predicted that LiMn2O4(P) would be less prone to manganese dissolution and hence would possess a higher cycle life when compared to LiMn2O4(S)
机译：通过燃料辅助溶液燃烧法制备了两批多晶锰酸锂。使用淀粉作为燃料制备LiMn2O4（S），使用聚乙烯醇（PVA）作为燃料制备LiMn2O4（P）。 XRD研究表明，与LiMn2O4（S）相比，LiMn2O4（P）中所有hkl峰的20个值均向较高值显着且一致的变化，表明前者晶格收缩。 TG / DTA研究表明LiMn2O4（P）的形成温度更高（约高25摄氏度）。较高的形成温度最有可能促进某些Mn3 +氧化为Mn4 +，且离子半径较低，从而引起晶格收缩。 XPS研究证实了这一假设，该研究表明LiMn2O4（P）中存在的Mn4 +比例高于LiMn2O4（S）中存在的比例。使用晶体形状算法从XRD数据生成锰酸锂的晶体习性，从而了解这些材料中暴露的hkl平面。根据暴露的hkl平面上的原子排列，可以预测LiMn2O4（P）较不易溶于锰，因此与LiMn2O4（S）相比具有较高的循环寿命。

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