Do transition metal carbonates have greater lithium storage capability than oxides? A case study of monodisperse CoCO3 and CoO microspindles.
Do transition metal carbonates have greater lithium storage capability than oxides? A case study of monodisperse CoCO3 and CoO microspindles.
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DOI：
10.1021/am5021233
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发表时间：
2014-07
影响因子：
9.5
通讯作者：
Lianbang Wang;Weijie Tang;Yu Jing;Liwei Su;Zhen Zhou
中科院分区：
文献类型：
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作者：
Lianbang Wang;Weijie Tang;Yu Jing;Liwei Su;Zhen Zhou
近年来，过渡金属碳酸盐（MCO3）作为过渡金属氧化物（MOs）的替代品，因其储锂能力而受到越来越多的关注。MCO3是否比MOs更适合锂存储？为了回答这个问题，我们合成了具有相似结构的单分散CoCO3和CoO微纺锤体，并对其进行了研究。除去结构效应，我们发现CoCO3仍然具有比CoO更高的可逆容量和速率能力。10次循环后，CoCO3的可逆容量为1065 mAh g(-1)，比CoO的（~ 720 mAh g(-1)）高48.2%。此外，通过对充放电曲线、循环伏安曲线和奈奎斯特图的深入分析，研究了两种材料的电化学行为差异。这项工作可以提高我们对MCO3相对于MOs的锂存储优势的认识，并对我们开发具有良好结构的高性能MCO3有启发。
As substitutions for transition metal oxides (MOs), transition metal carbonates (MCO3) have been attracting more and more attention because of their lithium storage ability in recent years. Is MCO3 better than MOs for lithium storage? To answer this question, monodisperse CoCO3 and CoO microspindles with comparable structures were synthesized and investigated as a case study. Excluding its structural effect, we found CoCO3 still exhibited reversible capacities and rate capabilities much higher than those of CoO. The reversible capacity of CoCO3 after 10 cycles was 1065 mAh g(-1), 48.2% higher than that (∼720 mAh g(-1)) of CoO. Furthermore, the greatly different electrochemical behaviors were investigated by analyzing the discharge-charge profiles, cyclic voltammetry curves, and Nyquist plots in depth. This work can improve our understanding of the lithium storage advantages of MCO3 against MOs and enlighten us in terms of developing high-performance MCO3 with favorable structures.