摘要
本文分别以柠檬酸(C6H8O7.H2O)和蔗糖(C12H22O11)为碳源,采用溶胶凝胶法合成了Li2MnSiO4/C材料。X射线衍射(XRD)结果显示合成出的Li2MnSiO4/C材料均属于正交晶系Pmn21空间群。扫描电子显微镜(SEM)结果表明合成出的Li2MnSiO4/C1(以C6H8O7.H2O为碳源)材料粒径均在500 nm左右,Li2MnSiO4/C2(以C12H22O11为碳源)材料粒径在1μm左右。充放电测试结果显示,Li2MnSiO4/C2较Li2MnSiO4/C1有较高的首次不可逆容量;两种电极材料经几周循环后均具有稳定的循环性能,所制得的Li2MnSiO4/C1较Li2MnSiO4/C2具有高的循环容量。
Li2MnSiO4/C cathode material was synthesized by sol-gel method with citric acid and sucrose as the carbon source respecively. Powder X-ray diffraction measurements confirmed the formation of both orthorhombic Li2MnSiO4/C with Pmn21 space group. Scanning electron microscopy showed Li2MnSiO4/ Cl （citric acid as the carbon source） were characterized by a large amount of particles with the size of 500 nm, while Li2MnSiO4/C2 （sucrose as the carbon source） was - 1μm. The electrochemical test results indicated that the initial irreversible capacity of Li2 MnSiO4/C2 was lager than the Li2 MnSiO4/Cl. Both Li2MnSiO4/C had stable discharge capacity after several cycles. Li2MnSiO4/Cl had a higher electrochemical discharge capacity than Li2MnSi04/C2
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第4期755-758,共4页
Bulletin of the Chinese Ceramic Society
基金
中央高校基本科研业务费专项资金(2010LKHX03
2010QNB04
2010QNB05)
中国矿业大学科技攀登计划(ON090237)资助项目
