氧化钒晶体是锂离子电池材料之一,为提升氧化钒的锂离子电池容量和性能,通过水热法,分别用正硅酸四乙酯(TEOS)和聚乙烯吡咯烷酮(PVP)还原V2O5,制备低价钒氧化物,采用X射线衍射仪(XRD)确定低价钒氧化物的物相组成,通过扫描电子显微镜(SEM)对样品的微观形貌进行表征。结果表明:制得的TEOS还原V2O5的产物主体为多种低价钒氧化物的混合物,电池容量约为400mAh/g;先用PVP还原再经过TEOS共水热包覆得到的产物为二氧化钒,测得电池容量约为140mAh/g。
Vanadium oxide crystal is one of Li-ion battery materials.In order to improve the capacity and performance of vanadium oxide Li-ion battery,vanadium oxide with low valence state was reduced by hydrothermal method with tetraethyl orthosilicate (TEOS) and polyvinylpyrrolidone(PVP).X-ray diffractometer (XRD) was used to determine the phase composition of low-valent vanadium oxide.Scanning electron microscope (SEM) was used to characterize the microscopic morphology of the sample.The main product of the obtained TEOS reduction V2O5 was mixture by various low-valent vanadium oxide,and its capacity was 400mAh/g.The product obtained by reducing with PVP and then co-hydrothermally coated with TEOS was vanadium dioxide,which had high battery capacity of 140mAh/g.
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基金资助
国家自然科学基金(51776143);湖北淡雅香生物科技股份有限公司科技合作项目(2020KH00957)
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