Dual Functions of Potassium Antimony(III)‐Tartrate in Tuning Antimony/Carbon Composites for Long‐Life Na‐Ion Batteries

材料科学 阳极 碳化 碳纤维 金属 电极 化学工程 无机化学 复合数 复合材料 冶金 扫描电子显微镜 物理化学 化学 工程类
作者
Tianjing Wu,Chenyang Zhang,Hongshuai Hou,Peng Ge,Guoqiang Zou,Wei Xu,Simin Li,Zhaodong Huang,Tianxiao Guo,Mingjun Jing,Xiaobo Ji
出处
期刊:Advanced Functional Materials [Wiley]
卷期号:28 (10) 被引量:52
标识
DOI:10.1002/adfm.201705744
摘要

Abstract 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 (C 8 H 10 O 15 Sb 2 K 2 ) 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: C 8 H 10 O 15 Sb 2 K 2 → Sb 2 O 3 /C → Sb 2 O 3 /Sb/C → Sb/C rods. Notably, organic ligands in C 8 H 10 O 15 Sb 2 K 2 can be gradually turned into amorphous carbon with simultaneous reduction of Sb 3+ 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 SbOC/C is formed, exhibiting a unique dual‐carbon‐modified structure and extensive SbOC 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.
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