合成Si/C複合材料

Abstract

此研究主要重點放在於合成Si/C複合材料，其最終應用在鋰離子電池做為陽極材料，從文獻得知矽有較大之電容量，但矽在充放電時，往往體積膨脹太大，而破壞原本結構而造成結構上的破裂（crack），此原因為此研究之起源，為了改善矽體積變化大太，在合成方面定出三個合成目標如下： 1.在矽表面成長一層碳管。 2.合成出球形矽且顆粒大小約為30~60nm。 3.碳管包覆奈米矽。 上面合成主要針對矽體積變化太大進而改善此問題而設立，用此合成出新的Si/C結構來改善矽體積膨脹問題並提升其電容量做為往後鋰離子電池之陽極材料。

關鍵字：Si/C複合材料、電容量、碳管

The major goal of this research is to synthesize Si/C composite materials using chemical vapor deposition method.The material serves as an anode material in the fabrication of Lithium-ion battery. Silicon possesses a large amount of capacity according to the literature,but it also exhibits the problem of dramatic volume expansion and shrinkage during charging and discharging. In order to slove the problem of volume expansion and shrinkage,three approaches are adopted to synthesize Si/C composite materials as follow: 1. Growing up the carbon nanotubes on the silicon surface。 2. Synthesizing nanosilicon of particle size in the range of 30~60nm。 3. Covering the nanosilicons with the carbon nanotubes。 We are used to improve the volume expansion problem and raise the capacity. The new Si/C composite materials produced with the above approaches.

Keyword: Si/C composite materials , carbon nanotubes , capacity