The electrochemical properties of LiCr 0.1 Mn 1.9 O 4 as a cathode material in five electrolyte solutions , LiPF 6/EC+DEC, LiPF 6/EC+EMC, LiPF 6/EC+DME, LiPF 6/EC+DMC and LiBF 4/ EC+ DMC have been studied. The initial...The electrochemical properties of LiCr 0.1 Mn 1.9 O 4 as a cathode material in five electrolyte solutions , LiPF 6/EC+DEC, LiPF 6/EC+EMC, LiPF 6/EC+DME, LiPF 6/EC+DMC and LiBF 4/ EC+ DMC have been studied. The initial capacity values were very close each to other for the electrolyte solutions examined. However, the capacity fading and self discharge data obtained from the cells with above electrolyte solutions were different in the order of LiPF 6/EC+DME>LiPF 6/EC+EMCLiPF 6/EC+DMC≈LiPF 6/EC+DEC≈LiBF 4/EC+DMC. Decrease of the electrochemical properties was attributed mainly to the electrolyte decompositions on the surface of the electrodes. LiPF 6/EC+DEC, LiPF 6/EC+DMC and LiBF 4/EC+DMC appeared electrolytes well compatible with LiCr 0.1 Mn 1.9 O 4 electrode.展开更多
采用共沉淀和固相烧结工艺制备LiNi0.5Mn1.5O4和LiCr0.1Ni0.45Mn1.45O4正极材料,对其比表面积、振实密度、倍率性能、高低温循环性能等性能指标进行测试,并利用SEM、XRD对所制材料进行形貌观察及物相分析。结果表明:添加微量Cr元素可稳...采用共沉淀和固相烧结工艺制备LiNi0.5Mn1.5O4和LiCr0.1Ni0.45Mn1.45O4正极材料,对其比表面积、振实密度、倍率性能、高低温循环性能等性能指标进行测试,并利用SEM、XRD对所制材料进行形貌观察及物相分析。结果表明:添加微量Cr元素可稳定材料结构,降低比表面积,改善LiNi0.5Mn1.5O4材料电化学性能;LiCr0.1Ni0.45Mn1.45O4正极材料振实密度可达到2.32 g/cm3,比表面积可达到0.51 m2/g,25℃下1.5C充放电,最高容量达到127.2 m A·h/g,300次循环后容量保持率为94.9%;50℃下1.5C充放电,初始容量达到128.5 m A·h/g,200次循环后容量保持率为88.7%。经XRD分析,循环完成后材料尖晶石的结构没有变化。展开更多
本文采用溶胶凝胶法制备了x Ni Fe_(1.9)Mn_(0.1)O_4/(1-x)Ba Ti O_3(x=0.1、0.2、0.3、0.4、0.5、0.6)系列多铁复合材料,研究了复合材料的结构、形貌、介电性及铁磁性。结果表明:当x<0.3时,铁电相和铁磁相的衍射峰明显,并且没有杂...本文采用溶胶凝胶法制备了x Ni Fe_(1.9)Mn_(0.1)O_4/(1-x)Ba Ti O_3(x=0.1、0.2、0.3、0.4、0.5、0.6)系列多铁复合材料,研究了复合材料的结构、形貌、介电性及铁磁性。结果表明:当x<0.3时,铁电相和铁磁相的衍射峰明显,并且没有杂相生成。复合材料的晶粒尺寸随着Ni Fe_(1.9)Mn_(0.1)O_4的增加而增加,致密性随着Ni Fe_(1.9)Mn_(0.1)O_4含量的增加而下降。材料具有介电性,并且铁磁相对材料的介电性有影响,材料的介电常数随频率变化在低频下较为明显,高频下介电常数趋于定值,低频下的介电常数较未掺入Mn时有所提高。样品中存在有序的磁结构,并且样品的磁性来源于Ni Fe_(1.9)Mn_(0.1)O_4,Mn的引入有利于提高样品的磁性。展开更多
文摘The electrochemical properties of LiCr 0.1 Mn 1.9 O 4 as a cathode material in five electrolyte solutions , LiPF 6/EC+DEC, LiPF 6/EC+EMC, LiPF 6/EC+DME, LiPF 6/EC+DMC and LiBF 4/ EC+ DMC have been studied. The initial capacity values were very close each to other for the electrolyte solutions examined. However, the capacity fading and self discharge data obtained from the cells with above electrolyte solutions were different in the order of LiPF 6/EC+DME>LiPF 6/EC+EMCLiPF 6/EC+DMC≈LiPF 6/EC+DEC≈LiBF 4/EC+DMC. Decrease of the electrochemical properties was attributed mainly to the electrolyte decompositions on the surface of the electrodes. LiPF 6/EC+DEC, LiPF 6/EC+DMC and LiBF 4/EC+DMC appeared electrolytes well compatible with LiCr 0.1 Mn 1.9 O 4 electrode.
文摘采用共沉淀和固相烧结工艺制备LiNi0.5Mn1.5O4和LiCr0.1Ni0.45Mn1.45O4正极材料,对其比表面积、振实密度、倍率性能、高低温循环性能等性能指标进行测试,并利用SEM、XRD对所制材料进行形貌观察及物相分析。结果表明:添加微量Cr元素可稳定材料结构,降低比表面积,改善LiNi0.5Mn1.5O4材料电化学性能;LiCr0.1Ni0.45Mn1.45O4正极材料振实密度可达到2.32 g/cm3,比表面积可达到0.51 m2/g,25℃下1.5C充放电,最高容量达到127.2 m A·h/g,300次循环后容量保持率为94.9%;50℃下1.5C充放电,初始容量达到128.5 m A·h/g,200次循环后容量保持率为88.7%。经XRD分析,循环完成后材料尖晶石的结构没有变化。
文摘本文采用溶胶凝胶法制备了x Ni Fe_(1.9)Mn_(0.1)O_4/(1-x)Ba Ti O_3(x=0.1、0.2、0.3、0.4、0.5、0.6)系列多铁复合材料,研究了复合材料的结构、形貌、介电性及铁磁性。结果表明:当x<0.3时,铁电相和铁磁相的衍射峰明显,并且没有杂相生成。复合材料的晶粒尺寸随着Ni Fe_(1.9)Mn_(0.1)O_4的增加而增加,致密性随着Ni Fe_(1.9)Mn_(0.1)O_4含量的增加而下降。材料具有介电性,并且铁磁相对材料的介电性有影响,材料的介电常数随频率变化在低频下较为明显,高频下介电常数趋于定值,低频下的介电常数较未掺入Mn时有所提高。样品中存在有序的磁结构,并且样品的磁性来源于Ni Fe_(1.9)Mn_(0.1)O_4,Mn的引入有利于提高样品的磁性。
