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| | The average valence of manganese in the MnZn ferrite has been described.Based on the high content of iron in the MnZn ferrite, ferric sulfate was added into the standard potassium permanganate solution to draw calibration curve in the determination of total amounts of manganese by spectrophotometry. High valence manganese was measured by the back titration of sodium oxalate with the standard potassium permanganate solution. The reductive elec... | | 根据锰锌铁氧体含铁量高的特点,通过绘制按比例添加硫酸铁的高锰酸钾标准溶液的工作曲线,采用分光光度法测定锰锌铁氧体中的总锰含量。然后采用高锰酸钾标准溶液反滴草酸钠的方法测定其中高价锰含量,从而得到还原电子数,结合总锰含量得出其锰的平均价态。对测定总锰含量的条件,如pH值、草酸钠和过硫酸铵的用量等进行了详细的研究。 | | 文摘来源 | | The spinel Lithium manganese oxide was synthesized with solid reaction method. Synthesized atmosphere, synthesized temperature, heating time and ratio of the raw material were investigated. The content of the different manganese valence of the samples was determined by titration analysis. The results show that the contents of Mn2+, Mn3+ and Mn4+ of the samples synthesized at different conditions are different and as a result there are different average #... | | 采用固相法合成了锂锰氧化物。考察了合成气氛、合成温度、恒温时间以及原料配比因素的影响,采用滴定分析的方法测定了不同工艺条件下合成样品中锰的不同价态的含量。研究发现,不同工艺条件下合成的样品中,Mn2+、Mn3+和Mn4+含量不同,所得到的Mn的平均价态也不同。电化学性能测试表明,在优化工艺条件下所合成的样品,首次放电容量为120.5mAh·g-1,第5次放电容量保持在114.6mAh·g-1,容量保持率为95.1%,表现出良好的电化学性能。 | | 文摘来源 | |   |
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