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离子交换法制备层状LixNi0.3Mn0.7O2正极材料及其离子交换规律的研究 总被引:5,自引:0,他引:5
通过共沉淀法高温固相反应在空气气氛中合成出具有P2型结构特征的碱青铜前驱体Na0.66Ni0.3Mn0.7O2,研究了在4种不同离子交换条件下进行离子交换反应得到目标正极材料LixNi0.3Mn0.7O2的离子交换规律,并用XRD、SEM、粒度分析和电性能测试考察了目标正极材料及其前驱体的结构、形貌和电化学性能。结果表明,以熔融LiNO3为介质于300 ℃离子交换4h反应进行得最为完全,离子交换率达98 %,且目标正极材料具有较完善的O2型层状结构,在2.6~2.9 V存在唯一的充放电平台,循环过程中未发现向尖晶石相转变;而离子交换时间过长,目标正极材料将出现尖晶石相而影响其放电容量和循环稳定性。 相似文献
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乌榄中矿质元素含量的测定 总被引:1,自引:0,他引:1
采用原子吸收分光光度法,对新鲜乌榄及腌制乌榄的果实和果仁中的钙、铁、镁、锰、钼、钠、镍、钴8种矿质元素的含量进行了测定,为乌榄的开发利用提供依据。结果表明,乌榄中含有丰富的钠、钙、镁、铁、锰、钼等人体必需的元素,有害元素钴、镍的含量较少。 相似文献
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掺镍型层状LixNiyMn1-yO2正极材料的合成与电性能研究 总被引:6,自引:0,他引:6
A kind of cathode material of layered LixNiyMn1-yO2 characterized with the O2 type has been synthesized by a simple method. Its precursor NaxNiyMn1-yO2 has been prepared from manganese dioxide, nickel hydroxide and sodium carbonate at high temperature in air and quickly cooled in cold water, then it has been exchanged by the melted LiNO3 at 300~400℃ in air. The effects of calcine-temperature for the precursors and its compositions (the content of Na and Ni) on the electrochemical properties of the material LixNiyMn1-yO2 have been investingated by XRD and electrochemical tests. The results show that the sample Li0.7Ni0.3Mn0.7O2, has the best electrochemical properties which shows only one charge-discharge potential stage of 2.8~3.0V and has a high specific capacity over 180mAh·g-1 cycled between 2.0~4.20V. A significant structure transformation to the spinal-type phase has not been found in the charge-discharge cycling and the discharge specific capacity around 165mAh·g-1 has re-mained after the 20th cyclings for the material. 相似文献
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