标题: 矽奈米结构之合成及其在锂离子电池上之应用
Synthesis of Silicon Nanostructures for Lithium-Ion Battery Application
作者: 刘得涌
裘性天
Liu, Te-Yung
Chiu, Hsin-Tien
应用化学系硕博士班
关键字: 矽;气固相反应;锂离子电池;Silicon;Vapor-solid reaction growth;Lithium-ion battery
公开日期: 2016
摘要: 在众多的电池能源技术中,锂离子电池因有高能量密度的特性,因此被广泛的研究。在其中,矽材由于他在地球上的含量多且具有相当高的理论电容值 (3579 mAh g-1),因此被视为锂离子电池中最有潜力的阳极材料之一。 在本研究中,我们利用气固相反应在较低温的环境下合成出高结晶性的纯矽材料。接着将其作为阳极活性材料以应用于锂离子电池上。当应用于锂离子电池之阳极时,似奈米线状结构的阳极活性材料,在420 mA g-1的充放电速度下经过50次循环充放电后有391 mAh g-1 (以EC/DEC作为电解液)及561 mAh g-1 (以EC/DMC/EMC作为电解液)的电容表现。相较于使用商业用的矽粉以及其它以发表的纯矽材料文献,有较高的电容表现以及稳定性。结果显示此纯矽材料是有潜力做为锂离子电池之阳极活性材料。此外,我们使用两种不同电解液配方,得到显着不同的电化学性能结果,以显示电解液于锂电上的重要性。
Among the various battery technologies, lithium ion batteries stand out because of the facilitating design of storage systems with high energy density. Silicon is a promising candidate for electrodes in lithium ion batteries due to its high theoretical lithium storage capability (3579 mAh g-1) and the numerous natural abundance. Here, we report that via a simple vapor-solid reaction growth (VSRG) method, highly crystalline silicon materials can be synthesized at relatively low temperatures. The as-fabricated Si samples were applied for lithium-ion battery anodes. The half cells consisted of Si nanowire-like (NW) structures demonstrated a reversible capacity 391 and 561 mAh g-1 in EC/DEC and EC/DMC/EMC electrolytes, respectively, after 50 discharge/charge cycles at a current density of 420 mA/g. In contrast to commercial Si particles, the results showed that the Si nanowire-like (NW) structures exhibited much higher reversible capacity and better cyclic stability, promising candidates for anode of lithium-ion battery. Furthermore, we compared two electrolytes which exhibit dramatically different electrochemical performance to show the important role of the electrolytes.
URI: http://etd.lib.nctu.edu.tw/cdrfb3/record/nctu/#GT070252544
http://hdl.handle.net/11536/141428
显示于类别:Thesis