Improvement of cycle behavior of Si/Sn anode composite supported by stable Si–O–C skeleton  

作　　者：Jian-Tao Wang Shi-Gang Lu Yao Wang Bin Huang Juan-Yu Yang Ao Tan 

机构地区：[1]R&D Center for Vehicle Battery and Energy Storage,General Research Institute for Nonferrous Metals,Beijing 100088,China

出　　处：《Rare Metals》2022年第5期1647-1651,共5页稀有金属（英文版）

基　　金：the National High Technology Research and Development Program of China(Nos.2011AA11A256,2013AA050903,and 2013AA050906)。

摘　　要：A Si/Sn/SiOC/graphite(SSSG) composite with high efficiency and long-term cycling stability was synthesized by a cost-effective and scalable method, including the processes of mechanical milling and pyrolysis. The composite was characterized by X-ray diffraction(XRD),scanning electron microscope(SEM) and energy dispersive X-ray spectrometry(EDX). The electrochemical properties were investigated until the 25th cycle. As a result, the SSSG composite anode exhibits excellent long-term cycling stability and capacity. Such SSSG composite anode shows excellent cycling stability with a specific capacity of 568.2 mAh·g^(-1) and ~80% capacity retention over 25 cycles at 0.3C rate. The reasons for good electrochemical characteristics are considered that the SiOC net with favorable chemical stability acts as a skeleton to support and segregate Si/Sn nanostructures, and the graphitic mixing in the composite is used as conductive material to enhance the electrical conductivity in this composite. The results suggest that the design of this new structure has the potential to provide a way for the other functional composite materials.

关 键 词：Si/Sn/SiOC/G Composite Li-ion battery ANODE Cycling stability 

分 类 号：TB332[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]