The microwave coprecipitation method was used to synthesize α-Ni0.8Co0.2(OH)2 precursor for preparing LiNi0.8Co0.2O2 cathode material.The precursor α-Ni0.8Co0.2(OH)2 was mixed with LiOH·H2O and then calcined in...The microwave coprecipitation method was used to synthesize α-Ni0.8Co0.2(OH)2 precursor for preparing LiNi0.8Co0.2O2 cathode material.The precursor α-Ni0.8Co0.2(OH)2 was mixed with LiOH·H2O and then calcined in O2 for 10 h at different temperatures(700℃,800℃,900℃).XRD,SEM analyses and electrochemical tests were used to study the physical and electrochemical performance of the cathode material.With increasing calcination temperature,the characteristic peaks of the cathode materials became stronger and sharper,corresponding to a perfect crystalization.The results of electrochemical tests indicate that the sample LiNi0.8Co0.2O2 (900℃)showed excellent electrochemical properties,with an initial discharge capacity of 189.1 mA·h·g-1 and an initial discharge efficiency of 92.5%.After 30 cycles,the discharge capacity was still 148 mA·h·g-1,showing good cyclic stability.展开更多
采用共淀法合成前驱体 Ni 0.8 Co 0.2（OH）2,再通过高温焙烧制备了锂离子二次电池正极材料LiNi 0.8 Co 0.2 O2。对材料进行了SEM测试，结果表明材料形貌近似为球形。XRD测试结果表明材料具有较好的层状结构。在2.8~4.3V（vs Li/Li＋）...采用共淀法合成前驱体 Ni 0.8 Co 0.2（OH）2,再通过高温焙烧制备了锂离子二次电池正极材料LiNi 0.8 Co 0.2 O2。对材料进行了SEM测试，结果表明材料形貌近似为球形。XRD测试结果表明材料具有较好的层状结构。在2.8~4.3V（vs Li/Li＋）条件下进行充放电测试，结果表明材料具有较好的电化学性能。展开更多
以共沉淀法合成了锂离子电池正极材料L iN i0.8Co0.2-xA lxO2(x=0,0.03,0.05)。对合成的层状材料采用X射线衍射(XRD)、扫描电镜(SEM)和差示扫描量热分析-热重分析(DSC-TG)进行了结构、形貌和热分析,对L iN i0.8Co0.2-xA lxO2材料以0.2 ...以共沉淀法合成了锂离子电池正极材料L iN i0.8Co0.2-xA lxO2(x=0,0.03,0.05)。对合成的层状材料采用X射线衍射(XRD)、扫描电镜(SEM)和差示扫描量热分析-热重分析(DSC-TG)进行了结构、形貌和热分析,对L iN i0.8Co0.2-xA lxO2材料以0.2 C倍率进行充放电测试,用循环伏安法分析充放电过程中的相变。实验结果表明,掺杂A l后材料的放电容量下降15 mAh/g,但相变得到抑制,材料的稳定性和循环性能提高。展开更多
文摘The microwave coprecipitation method was used to synthesize α-Ni0.8Co0.2(OH)2 precursor for preparing LiNi0.8Co0.2O2 cathode material.The precursor α-Ni0.8Co0.2(OH)2 was mixed with LiOH·H2O and then calcined in O2 for 10 h at different temperatures(700℃,800℃,900℃).XRD,SEM analyses and electrochemical tests were used to study the physical and electrochemical performance of the cathode material.With increasing calcination temperature,the characteristic peaks of the cathode materials became stronger and sharper,corresponding to a perfect crystalization.The results of electrochemical tests indicate that the sample LiNi0.8Co0.2O2 (900℃)showed excellent electrochemical properties,with an initial discharge capacity of 189.1 mA·h·g-1 and an initial discharge efficiency of 92.5%.After 30 cycles,the discharge capacity was still 148 mA·h·g-1,showing good cyclic stability.
文摘采用共淀法合成前驱体 Ni 0.8 Co 0.2（OH）2,再通过高温焙烧制备了锂离子二次电池正极材料LiNi 0.8 Co 0.2 O2。对材料进行了SEM测试，结果表明材料形貌近似为球形。XRD测试结果表明材料具有较好的层状结构。在2.8~4.3V（vs Li/Li＋）条件下进行充放电测试，结果表明材料具有较好的电化学性能。
文摘以共沉淀法合成了锂离子电池正极材料L iN i0.8Co0.2-xA lxO2(x=0,0.03,0.05)。对合成的层状材料采用X射线衍射(XRD)、扫描电镜(SEM)和差示扫描量热分析-热重分析(DSC-TG)进行了结构、形貌和热分析,对L iN i0.8Co0.2-xA lxO2材料以0.2 C倍率进行充放电测试,用循环伏安法分析充放电过程中的相变。实验结果表明,掺杂A l后材料的放电容量下降15 mAh/g,但相变得到抑制,材料的稳定性和循环性能提高。
