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首页> 外文期刊>Journal of power sources >Anomalous step at x=0.7 in potential―composition profiles of Li_xCr_yMn_(2-y)O_4 spinels at low temperature
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Anomalous step at x=0.7 in potential―composition profiles of Li_xCr_yMn_(2-y)O_4 spinels at low temperature

机译：Li_xCr_yMn_（2-y）O_4尖晶石的低温势构图中x = 0.7处的异常台阶

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摘要

In order to investigate the relation between spinel type structure and anomaly in potential-composition profile of stoichiometric LiMn_2O_4 spinel at low temperature (T≤278 K), several LiCr_yMn_(2-y)O_4 type spinels (y = 0.01-0.25) have been synthesized by conventional solid-state reaction and their potential-composition (φ-x; Li_xCr_yMn_(2-y),O_4) profiles at 273 K have been recorded. The φ-x profiles of the specimens (y = 0.01-0.03) show an anomalous stepwise feature as one that stoichiometric LiMn_2O_4 shows at low temperature. However, the step at x=0.7 becomes weak with increase of the value y, and finally disappears. In the specimens, Mn and Cr are considered to occupy only 16d sites of spinel type structure. As compared with the ?-x profiles of lithium-excess type spinels Li_(1+δ)Mn_(2-δ)O_4 and lithium-deficient type spinels Li_(1-δ)Mn_2O_4, the gradual result suggests that state of Mn lattice strongly affects the appearance of anomalous step at x=0.7.
机译：为了研究低温（T≤278K）的化学计量LiMn_2O_4尖晶石的电位组成分布中的尖晶石类型结构与异常之间的关系，已经研究了几种LiCr_yMn_（2-y）O_4型尖晶石（y = 0.01-0.25）。记录了通过常规固态反应合成的化合物及其在273 K时的电势组成（φ-x; Li_xCr_yMn_（2-y），O_4）分布图。样品的φ-x轮廓（y = 0.01-0.03）显示出异常的逐步特征，如化学计量LiMn_2O_4在低温下显示的特征。但是，随着值y的增加，x = 0.7处的阶跃变弱，最终消失。在样品中，Mn和Cr被认为仅占据尖晶石型结构的16d位点。与锂过量型尖晶石Li_（1 +δ）Mn_（2-δ）O_4和锂缺乏型尖晶石Li_（1-δ）Mn_2O_4的α-x分布图相比，渐进结果表明锰的状态x = 0.7时，晶格强烈影响异常台阶的出现。

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