Nguyen Tuan Loi, Kim Ji Hyeon, Kim Il Tae
Department of Chemical and Biological Engineering, Gachon University, Seongnam-si, Gyeonggi-do, 13120, Republic of Korea.
J Nanosci Nanotechnol. 2019 Feb 1;19(2):1001-1005. doi: 10.1166/jnn.2019.15956.
We have synthesized a novel composite material Sn/SnO/Ni₃Sn via galvanic replacement reaction between Sn and Ni ions in triethylene glycol medium and at high temperature. The reaction time affected structure, particle size, and composition of Sn/SnO/Ni₃Sn composites, which were analyzed by high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The active component (Sn) reacts with Li ions while inactive component (Ni) acts as a metal framework to support the electrochemically active Sn, a buffer to reduce volume change during cycling, and the electron conductor. Among electrodes, the Sn/SnO/Ni₃Sn-6h electrode demonstrated stable cycling and reversible capacity of 246 mAh g even after 300 cycles owing to the advantages from the unique hybrid structure.
我们通过在三甘醇介质中高温下Sn与Ni离子之间的置换反应合成了一种新型复合材料Sn/SnO/Ni₃Sn。反应时间影响了Sn/SnO/Ni₃Sn复合材料的结构、粒径和组成，通过高分辨率透射电子显微镜、能量色散X射线光谱和X射线衍射对其进行了分析。活性成分（Sn）与锂离子反应，而非活性成分（Ni）作为金属框架来支撑电化学活性Sn，作为减少循环过程中体积变化的缓冲剂以及电子导体。在电极中，Sn/SnO/Ni₃Sn-6h电极由于独特的混合结构优势，即使在300次循环后仍表现出稳定的循环性能和246 mAh g的可逆容量。
