Growth and morphology of neodymium or ytterbium doped calcium gadolinium yttrium oxoborate (Re∶Ca 4Gd x Y 1- x O(BO 3) 3(Re∶GdYCOB)Re =Nd,Yb; x =0-1)were systematically studied. Polycrystalline materials used for Re...Growth and morphology of neodymium or ytterbium doped calcium gadolinium yttrium oxoborate (Re∶Ca 4Gd x Y 1- x O(BO 3) 3(Re∶GdYCOB)Re =Nd,Yb; x =0-1)were systematically studied. Polycrystalline materials used for Re∶GdYCOB single crystals growth were synthesized by multistage solid phase reaction method.Re∶GdYCOB single crystals were grown by Czochralski technique.The pulling rates are 0.5-2mm/h and the rotation rates are 10-30r/min.Usually 65-75% polycrystalline materials can be transformed into good quality single crystals under our growth conditions. The structures of some as grown Re∶GdYCOB single crystals were measured by using a four circle diffractometer.The results measured show that the space group of the crystals is C 3 s Cm.The determined lattice constants of 8 at% Nd doped Ca 4YO(BO 3) 3 single crystal are a =0.8076nm, b =1.6020nm, c =0.3527nm , β =101.23°.展开更多
研究了不同烧结温度及恒温保持时间对富锂锰基正极材料Li1＋x[Ni0.35Mn0.65]O2＋y形貌、结构及电化学性能的影响。XRD及SEM研究结果表明：所合成的Li1＋x[Ni0.35Mn0.65]O2＋y正极材料为层状α-NaFeO2结构,类球形,单颗粒大小均匀。扣式...研究了不同烧结温度及恒温保持时间对富锂锰基正极材料Li1＋x[Ni0.35Mn0.65]O2＋y形貌、结构及电化学性能的影响。XRD及SEM研究结果表明：所合成的Li1＋x[Ni0.35Mn0.65]O2＋y正极材料为层状α-NaFeO2结构,类球形,单颗粒大小均匀。扣式电池测试结果表明：当电流密度为12.5 m A/g,测试电压在2.04.8 V时,Li1＋x[Ni0.35Mn0.65]O2＋y材料最高初始放电比容量为213.3 m A·h/g,首次放电效率为71.0%。扣电进行EIS测试,结果表明材料具有较小的电荷转移阻抗。展开更多
匣钵在煅烧制备三元正极材料LiNi x Co y Mn z O 2(LNCM)过程中易遭受电池正极材料中Li 2O等的渗透侵蚀,而镁铝尖晶石具有良好的高温性能和抗碱侵蚀性能。通过实验室混合反应法研究了镁铝尖晶石与LNCM正极材料前驱体混合试样在800~1100...匣钵在煅烧制备三元正极材料LiNi x Co y Mn z O 2(LNCM)过程中易遭受电池正极材料中Li 2O等的渗透侵蚀,而镁铝尖晶石具有良好的高温性能和抗碱侵蚀性能。通过实验室混合反应法研究了镁铝尖晶石与LNCM正极材料前驱体混合试样在800~1100℃的反应,对不同温度煅烧后混合试样的物相组成和微观结构进行了分析。探究了镁铝尖晶石作为匣钵基质的可能性。研究了加入不同质量分数(3%、6%和9%)镁铝尖晶石细粉对匣钵材料强度及抗热震性能的影响。结果表明:含镁铝尖晶石细粉的匣钵适用煅烧温度低于1000℃的LNCM正极材料的制备,加入量为6%(w)时,能够提高莫来石质匣钵材料的抗热震性能。展开更多
文摘Growth and morphology of neodymium or ytterbium doped calcium gadolinium yttrium oxoborate (Re∶Ca 4Gd x Y 1- x O(BO 3) 3(Re∶GdYCOB)Re =Nd,Yb; x =0-1)were systematically studied. Polycrystalline materials used for Re∶GdYCOB single crystals growth were synthesized by multistage solid phase reaction method.Re∶GdYCOB single crystals were grown by Czochralski technique.The pulling rates are 0.5-2mm/h and the rotation rates are 10-30r/min.Usually 65-75% polycrystalline materials can be transformed into good quality single crystals under our growth conditions. The structures of some as grown Re∶GdYCOB single crystals were measured by using a four circle diffractometer.The results measured show that the space group of the crystals is C 3 s Cm.The determined lattice constants of 8 at% Nd doped Ca 4YO(BO 3) 3 single crystal are a =0.8076nm, b =1.6020nm, c =0.3527nm , β =101.23°.
文摘研究了不同烧结温度及恒温保持时间对富锂锰基正极材料Li1＋x[Ni0.35Mn0.65]O2＋y形貌、结构及电化学性能的影响。XRD及SEM研究结果表明：所合成的Li1＋x[Ni0.35Mn0.65]O2＋y正极材料为层状α-NaFeO2结构,类球形,单颗粒大小均匀。扣式电池测试结果表明：当电流密度为12.5 m A/g,测试电压在2.04.8 V时,Li1＋x[Ni0.35Mn0.65]O2＋y材料最高初始放电比容量为213.3 m A·h/g,首次放电效率为71.0%。扣电进行EIS测试,结果表明材料具有较小的电荷转移阻抗。
文摘匣钵在煅烧制备三元正极材料LiNi x Co y Mn z O 2(LNCM)过程中易遭受电池正极材料中Li 2O等的渗透侵蚀,而镁铝尖晶石具有良好的高温性能和抗碱侵蚀性能。通过实验室混合反应法研究了镁铝尖晶石与LNCM正极材料前驱体混合试样在800~1100℃的反应,对不同温度煅烧后混合试样的物相组成和微观结构进行了分析。探究了镁铝尖晶石作为匣钵基质的可能性。研究了加入不同质量分数(3%、6%和9%)镁铝尖晶石细粉对匣钵材料强度及抗热震性能的影响。结果表明:含镁铝尖晶石细粉的匣钵适用煅烧温度低于1000℃的LNCM正极材料的制备,加入量为6%(w)时,能够提高莫来石质匣钵材料的抗热震性能。
