硅氧烷用量对SiO_x@C纳米复合材料储锂性能影响

Influence of siloxane dosage on lithium storage properties of synthesized SiO_x@C nanocomposites

以间苯二酚、甲醛和三乙氧基乙基硅烷为原料,通过共组装、聚合反应和热解合成了SiO_x@C纳米复合材料,重点研究了硅氧烷用量对合成的SiO_x@C复合材料储锂性能的影响。分别用X射线衍射(XRD)、拉曼光谱、元素分析(EA)和扫描电镜(SEM)表征了材料的组成、结构和形貌。用恒流充放电技术测试了材料的储锂性能。结果表明:合成材料的组成和储锂性能与硅氧烷用量密切相关。其中,由64.1%SiO_x和35.9%C组成的SiO_x@C纳米复合材料表现出了最好的储锂特性,经过200个循环后放电比容量仍然高达763 m Ah/g。

SiOx@C nanocomposites were synthesized by co-assembly, polymerization reaction and pyrolysis using resorcinol, formaldehyde and triethoxyethylsilanes as starting materials. Main attention was placed on influence of siloxane dosage on lithium storage properties of the synthesized SiOx@C nanocomposites. The composition, structure and morphology of the as-prepared SiOx@C nanocomposites were examined by X-ray diffraction （XRD）, Raman spectroscopy, elemental analysis （EA） and scanning electron microscope （SEM）, respectively. Constant current charge-discharge technology was used to investigate the lithium storage properties of the synthesized nanocomposites. The results show that the composition and lithium storage properties of the synthesized SiOx@C nanocomposites are closely related with siloxane dosage. Among them, the SiOx@C nanocomposite composed of 64.1% SiOxand 35.9% C exhibited the best lithium storage property. After 200 cycles, the discharge capacity was still as high as 763 mAh/g.