화학공학소재연구정보센터
Journal of Power Sources, Vol.275, 458-467, 2015
Nano/micro structure ammonium cerium nitrate tetrahydrate/carbon nanotube as high performance lithium storage material
Using carbon nanotube (CNT) as conductive additive, (NH4)(2)Ce(NO3)(5).4H(2)O/CNT is prepared from (NH4)(2)Ce(NO3)(6) by a facile solution method and used as high capacity anode material for the first time. Morphology and structure investigation shows that (NH4)(2)Ce(NO3)(5).4H(2)O/CNT exhibits high purity phase with particle size of 0.11.0 mu m. In the composite, CNT provides a three-dimensional conductive network for electron transportation and can maintain the whole structure upon electrochemical cycles. For comparison, (NH4)(2)Ce(NO3)(5).4H(2)O and (NH4)(2)Ce(NO3)(5).4H(2)O/carbon black ((NH4)(2)Ce(NO3)(5).4H(2)O/CB) are also prepared by the same method. Impurity phase of (NH4)(3)Ce-2(NO3)(9) can be detected in both (NH4)(2)Ce(NO3)(5).4H(2)O and (NH4)(2)Ce(NO3)(5).4H(2)O/CB. Electrochemical testing results reveals that (NH4)(2)Ce(NO3)(5).4H(2)O/CNT shows lower initial discharge capacity (1683.6 mAh g(-1)) than (NH4)(2)Ce(NO3)(5).4H(2)O (1972.8 mAh g(-1)) in the first cycle. However, (NH4)(2)Ce(NO3)(5).4H(2)O/CNT shows the highest reversible capacity among all the three samples. After 30 cycles, it can deliver a reversible capacity of 818.5 mAh g(-1), which is much higher than that of (NH4)(2)Ce(NO3)(5).4H(2)O (50.6 mAh g(-1)) and (NH4)(2)Ce(NO3)(5).4H(2)O/CB (208.8 mAh g(-1)). It suggests that the enhanced electrochemical properties are attributed to the introduction of CNT, which improves the electronic conductivity and structural stability during repeated cycles. (C) 2014 Elsevier B.V. All rights reserved.