Single-crystal H2V3O8 nanowires: a competitive anode with large capacity for aqueous lithium-ion batteries
Single-crystal H2V3O8 nanowires: a competitive anode with large capacity for aqueous lithium-ion batteries
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DOI：
10.1039/c0jm02788j
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发表时间：
2011-01-01
影响因子：
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通讯作者：
Zhou, Haoshen
中科院分区：
文献类型：
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作者：
Li, Huiqiao;Zhai, Tianyou;Zhou, Haoshen
采用简单的一步水热法制备了宽度约为50 nm的单晶H2 V3 O 8纳米线，并用SEM、TEM、TGA、XRD、XPS等手段对其形貌和结构进行了表征。首次研究了该材料作为水溶液锂离子电池负极候选材料的可能性。循环伏安和恒电流充放电测试表明，Li+在该材料中的嵌入/脱嵌在电解质溶液中是高度可逆的。合成的H2 V3 O 8纳米线在5 M LiNO 3和0.001M LiOH的水溶液中在0.1A g（-1）的电流密度下可获得234 mAh g（-1）的放电容量，远大于其他钒氧化物在水电解质中的可用容量（小于110 mAh g（-1））。此外，H2 V3 O 8纳米线可以在50次循环后充电/放电，在有机电解质中几乎没有容量损失，在水性电解质中的容量保持率超过70%，显示出比其他钒氧化物前驱物更好的循环稳定性用于水性锂离子电池。
Single-crystal H2V3O8 nanowires with a width of similar to 50 nm were fabricated by a facile one-step hydrothermal method and SEM, TEM, TGA, XRD, XPS were used to characterize their morphology and structure details. The possibility of using this material as an anode candidate for aqueous lithium-ion batteries was investigated for the first time. CV and galvanostatic charge/discharge measurements indicated that the intercalation/deintercalation of Li+ in this material in aqueous electrolyte is highly reversible. A discharge capacity of 234 mAh g(-1) can be obtained for the synthesized H2V3O8 nanowires at the current density of 0.1 A g(-1) in aqueous solution of 5 M LiNO3 and 0.001 M LiOH, much larger than the available capacities (less than 110 mAh g(-1)) of other vanadium oxides in aqueous electrolyte. Furthermore, the H2V3O8 nanowires can be charge/discharged upon 50 cycles with nearly no capacity loss in organic electrolyte and a capacity retention over 70% in aqueous electrolyte, showing better cycle stability than other vanadium oxide predecessors for aqueous lithium-ion batteries.