Zn_4Si_2O_7(OH)_2纳米带的合成及其电化学性能研究

THE SYNTHESIS OF ZINC SILICATE HYDROXIDE NANOBELTS AND THEIR ELECTROCHEMICAL PROPERTIES

以介孔氧化硅SBA-15为硅源,Zn(NO3)2.6H2O为锌源,碱性条件下于220℃进行水热反应,合成了束状纳米带形貌的异极矿Zn4Si2O7(OH)2.H2O.产物经过500℃焙烧,对焙烧产物进行了XRD表征.结果表明得到了产物Zn4Si2O7(OH)2,且由SEM表征可得焙烧后产物形貌无明显变化,仍为束状纳米带,长度约为十几微米.以Zn4Si2O7(OH)2束状纳米带做为电极材料研究其电化学性能(锂电池组装材料为活性物质、乙炔黑、聚四氟乙烯,质量比为7∶2∶1),放电循环性能图表明在电流密度为0.1 A/g时,Zn4Si2O7(OH)2纳米带的首次放电比容量达到1 176mAh/g.但是,随着循环次数的增加,放电比容量逐渐衰减,可能在电化学反应过程中发生不可逆反应.

Zinc silicate hydroxide nanobelts were successfully synthesized via a hydrothermal route. These nanobe- Its were characterized by the X -ray diffraction, scanning electron microscopy. Furthermore, these nanobelts were used as the electrode materials for Li ions intercalation and their electrochemical properties were investigated. The initial discharge capacity was found to be 1 176 mAh/g at a current density of 0. 1 A/g.