Xianjun ZHU
,
Pingchu CHEN
,
Hui ZHAN
,
Yunhong ZHOU
,
null
材料科学技术（英文）
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 LiNi0.85Co0.15-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, LiNi0.85Co0.15Al0.05O2 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.
关键词:
Cathode materials
,
共掺杂
,
LiNi0.85Co0.15-xAlxO2
,
锂
段萍
,
罗玉萍
,
刘健梅
,
朱忠其
,
柳清菊
功能材料
doi:10.3969/j.issn.1001-9731.2014.12.014
采用溶胶-凝胶法制备了Co掺杂TiO2粉体(Co-TiO2),采用 XRD、FT-Raman、UV-Vis、PL 等方法对其进行表征和分析。结果表明,Co 掺杂降低了TiO2的相转变温度,拓展了 TiO2对可见光的吸收范围,有效地抑制了光生电子-空穴对的复合。光催化降解亚甲基蓝(MB)的实验表明,n (Co)∶n (Ti)=0.002,400℃烧结的 Co-TiO2粉体具有最佳光催化性能,在普通日光灯下对亚甲基蓝的降解率达90.56%,明显优于德国 Degussa 公司生产的 P25纯TiO2光催化剂对亚甲基蓝的降解率44.95%。
关键词:
纳米TiO2
,
Co掺杂
,
光催化
