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Dual Functions of Potassium Antimony(III)‐Tartrate in Tuning Antimony/Carbon Composites for Long‐Life Na‐Ion Batteries
Advanced Functional Materials ( IF 19.0 ) Pub Date : 2018-01-10 , DOI: 10.1002/adfm.201705744
Tianjing Wu 1 , Chenyang Zhang 2 , Hongshuai Hou 1 , Peng Ge 1 , Guoqiang Zou 1 , Wei Xu 1 , Simin Li 1 , Zhaodong Huang 1 , Tianxiao Guo 1 , Mingjun Jing 3 , Xiaobo Ji 1
Affiliation  

Antimony holds a high‐specific capacity as a promising anode material for Na‐ion batteries (SIBs) and much research is focused on solving the poor cycling stability issue associated with its large volume expansion during alloying/dealloying processes. Here, self‐thermal‐reduction method is successfully applied to prepare antimony/carbon rods (Sb/C rods) utilizing potassium antimony(III)‐tartrate (C8H10O15Sb2K2) as a dual source of carbon matrix and metallic antimony. According to theory calculations and experiment results, the formation process is explicitly explored as follows: C8H10O15Sb2K2 → Sb2O3/C → Sb2O3/Sb/C → Sb/C rods. Notably, organic ligands in C8H10O15Sb2K2 can be gradually turned into amorphous carbon with simultaneous reduction of Sb3+ to metal Sb. Moreover, potassium chloride acts as an activator and a template during the course of carbonization, and synchronous reduction is introduced. Consequently, an antimony/carbon electrode material denoted as SbOC/C is formed, exhibiting a unique dual‐carbon‐modified structure and extensive SbOC bridge bonds that give rise to outstanding cycling performance and rate capacity. Specifically, the capacity is maintained at 404 mA h g−1 with 89% retention after 700 cycles at 500 mA g−1. The low‐cost, self‐thermal‐reduction method and excellent electrode performances of electrode material make it attractive for large‐scale energy storage systems.

中文翻译:

酒石酸钾锑(III)的双重功能可调节长寿命钠离子电池的锑/碳复合材料

锑作为钠离子电池(SIB)的有希望的负极材料具有很高的比容量,许多研究都集中在解决与合金化/脱合金过程中其大体积膨胀相关的较差的循环稳定性问题。在此,成功地采用自热还原法,以酒石酸锑锑(C 8 H 10 O 15 Sb 2 K 2)作为碳基质的双重来源,制备了锑/碳棒(Sb / C棒)。和金属锑。根据理论计算和实验结果,明确探讨了其形成过程:C 8 H 10 O 15 Sb 2 K 2→Sb 2 O 3 / C→Sb 2 O 3 / Sb / C→Sb / C棒。值得注意的是,C 8 H 10 O 15 Sb 2 K 2中的有机配体可以逐渐转变为无定形碳,同时将Sb 3+还原为金属Sb。此外,氯化钾在碳化过程中充当活化剂和模板,并引入了同步还原。因此,表示为Sb的锑/碳电极材料 ö C / C形成,表现出独特的双碳改性的结构和广泛的Sb Ò C桥键可产生出色的循环性能和倍率容量。具体地,在500mA g -1下700次循环之后,容量保持在404mA hg -1下并保持89%。低成本,自热还原的方法以及极好的电极材料的电极性能使其对于大规模储能系统具有吸引力。
更新日期:2018-01-10
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