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以硝酸镍为原料通过化学氧化法先制备出NiOOH,然后与LiOH.H2O、La2O3按一定比例混合均匀,并在空气气氛中低温焙烧制备球形La掺杂LiNiO2正极材料。用TG-DTA、XRD、SEM等手段对材料结构及形貌进行了表征,结果表明600℃焙烧的材料具有更加完整的层状结构,材料由边界长350nm的不规则颗粒组成,且团聚成直径5μm的球形颗粒。电化学性能测试表明相比纯LiNiO2,LiNi1-xLaxO2具有更高的放电比容量和容量保持率、较好的倍率性能和较小的交流阻抗,说明微量La掺杂增强了LiNiO2的电化学性能。 相似文献
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Xianjun ZHU Pingchu CHEN Hui ZHAN Yunhong ZHOU 《材料科学技术学报》2006,22(1):35-39
LiNi0.85CO0.15-xAlxO2 samples (x=0.025, 0.05 and 0.10) were prepared by solid state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, Co2O3 and Al(OH)3 under oxygen flow. Layered LiNiO2 simultaneously doped by Co-Al has been tried to improve the cathode performance. The results showed that substitution of optimum amount Al and Co for the Ni in LiNiO2 definitely had some beneficial effect on increasing the capacity and cycling behavior. When increasing x in LiNio.85CO0.15-xAlxO2, the initial discharge capacity decreased and its cyclability increased. Compromising high specific capacity and good cyclability, the optimum x in LiNi0.85Co0.15-xAlxO2 was x=0.05. As a consequence, LiNi0.85Co0.15-xAlxO2 had the first discharge capacity of 186.2 mAh/g and a capacity of 180.1 mAh/g after 10 cycles. Differential capacity vs voltage curves indicated that the co-doped LiNiO2 showed suppression of the phase transitions as compared with LiNiO2. 相似文献
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