以废旧NiCoMn三元材料为原材料,采用溶胶-凝胶自蔓延燃烧法制备出优良的LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2锂离子电池正极三元复合材料,用XRD、SEM和充放电测试等方法对材料的结构、形貌和电化学性能进行了表征,并研究了煅烧温度的影响。...以废旧NiCoMn三元材料为原材料,采用溶胶-凝胶自蔓延燃烧法制备出优良的LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2锂离子电池正极三元复合材料,用XRD、SEM和充放电测试等方法对材料的结构、形貌和电化学性能进行了表征,并研究了煅烧温度的影响。结果表明,制备的LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2不仅具有较好的层状结构,还具有多孔的特性;在2.75~4.30 V测试条件下,900℃合成的样品的首次放电容量为169.4 m Ah/g,库伦效率约为88.6%,经过30次循环后,0.2 C倍率下的容量保持率为95.5%,具有最高的比容量和较好的循环性能。展开更多
以废旧NiCoMn三元材料为原料,采用溶胶-凝胶自蔓延燃烧法制备了LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2锂离子电池正极三元复合材料。通过XRD、SEM、蓝电测试仪对其结构、形貌和电化学性能进行了表征。结果表明,该材料不仅具有较好的层状结构,...以废旧NiCoMn三元材料为原料,采用溶胶-凝胶自蔓延燃烧法制备了LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2锂离子电池正极三元复合材料。通过XRD、SEM、蓝电测试仪对其结构、形貌和电化学性能进行了表征。结果表明,该材料不仅具有较好的层状结构,还具有多孔特性。在2.75~4.30 V、0.2C测试条件下,800℃煅烧8 h的样品具有相对较好的电化学性能,其首次放电容量为165.8 m Ah/g,库伦效率约86.8%,经过50次循环后,容量保持率约为93.3%。展开更多
Nanocrystalline MTiO3 （M = St, Pb, Co） were prepared by a general self-pro- pagating combustion method. The samples were characterized by X-ray diffraction （XRD） analysis, scanning electron microscopy （SEM）, tra...Nanocrystalline MTiO3 （M = St, Pb, Co） were prepared by a general self-pro- pagating combustion method. The samples were characterized by X-ray diffraction （XRD） analysis, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, N2 adsorption and UV-vis diffuse reflectance spectra （DRS）. The photocatalytic activity of MTiO3 （M = Sr, Pb, Co） was evaluated by the photocatalytic degradation of methyl orange （MO）. MTiO3 （M = Sr, Pb, Co） having the same core element showed distinctly different photocatalytic activity due to the different coordinating atoms. Factors affecting the photocatalytic activity of MTiO3 （M = Sr, Pb, Co） were discussed. It was suggested that the structures of TiO6 octahedra and the electronic property were the predominant factors of the photocatalytic behavior for MTiO3 （M = Sr, Pb, Co）.展开更多
文摘以废旧NiCoMn三元材料为原材料,采用溶胶-凝胶自蔓延燃烧法制备出优良的LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2锂离子电池正极三元复合材料,用XRD、SEM和充放电测试等方法对材料的结构、形貌和电化学性能进行了表征,并研究了煅烧温度的影响。结果表明,制备的LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2不仅具有较好的层状结构,还具有多孔的特性;在2.75~4.30 V测试条件下,900℃合成的样品的首次放电容量为169.4 m Ah/g,库伦效率约为88.6%,经过30次循环后,0.2 C倍率下的容量保持率为95.5%,具有最高的比容量和较好的循环性能。
文摘以废旧NiCoMn三元材料为原料,采用溶胶-凝胶自蔓延燃烧法制备了LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2锂离子电池正极三元复合材料。通过XRD、SEM、蓝电测试仪对其结构、形貌和电化学性能进行了表征。结果表明,该材料不仅具有较好的层状结构,还具有多孔特性。在2.75~4.30 V、0.2C测试条件下,800℃煅烧8 h的样品具有相对较好的电化学性能,其首次放电容量为165.8 m Ah/g,库伦效率约86.8%,经过50次循环后,容量保持率约为93.3%。
基金financially supported by the Educational Commission of Fujian Province(No. JB11005)Fund for Fostering Excellent Young Key Teachers of Fujian Normal University (fjsdjk2012067)
文摘Nanocrystalline MTiO3 （M = St, Pb, Co） were prepared by a general self-pro- pagating combustion method. The samples were characterized by X-ray diffraction （XRD） analysis, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, N2 adsorption and UV-vis diffuse reflectance spectra （DRS）. The photocatalytic activity of MTiO3 （M = Sr, Pb, Co） was evaluated by the photocatalytic degradation of methyl orange （MO）. MTiO3 （M = Sr, Pb, Co） having the same core element showed distinctly different photocatalytic activity due to the different coordinating atoms. Factors affecting the photocatalytic activity of MTiO3 （M = Sr, Pb, Co） were discussed. It was suggested that the structures of TiO6 octahedra and the electronic property were the predominant factors of the photocatalytic behavior for MTiO3 （M = Sr, Pb, Co）.
