Effect of ZnO nanomaterials associated with Ca(OH)2 as anode material for Ni–Zn batteries
Effect of ZnO nanomaterials associated with Ca(OH)2 as anode material for Ni–Zn batteries
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DOI：
10.1016/j.jpowsour.2006.04.010
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发表时间：
2006-09
影响因子：
9.2
通讯作者：
Yongfeng Yuan;J. Tu;H. Wu;Yi Li;D. Shi;X. Zhao
中科院分区：
文献类型：
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作者：
Yongfeng Yuan;J. Tu;H. Wu;Yi Li;D. Shi;X. Zhao
采用直接沉淀法制备了Ca(OH)2包覆的棱柱形ZnO纳米材料。 TEM显微照片显示树枝状Ca(OH)2似乎附着在纳米ZnO的表面。 XRD图谱表明涂层为Ca(OH)2·2Zn(OH)2·2H2O。采用Ca(OH)2包覆纳米ZnO作为负极材料，通过充放电循环测试和EIS研究。 ZnO纳米材料和Ca(OH)2的结合防止了放电产物ZnO溶解在电解液中。因此，Ca(OH)2包覆的ZnO纳米材料表现出比纯纳米ZnO更高的电化学活性，包括高的放电容量和放电中间电压、低的充电中间充电电压。尽管Ca(OH)2导致更难活化，但EIS显示电荷转移电阻低于纯ZnO纳米材料。
Prism ZnO nanomaterials coated with Ca(OH)2were prepared by direct precipitation. TEM micrographs showed that dendritic Ca(OH)2seemed to attach on the surface of nanosized ZnO. The XRD patterns indicated that the coating was Ca(OH)2·2Zn(OH)2·2H2O. The nanosized ZnO coated with Ca(OH)2as the anode materials were investigated by the charge–discharge cycle measurement and EIS. The combination of ZnO nanomaterials and Ca(OH)2prevented the discharge product ZnO from dissolving in the electrolyte. Therefore, the Ca(OH)2-coated ZnO nanomaterials exhibited higher electrochemical activity than the pure nanosized ZnO, including high the discharge capacity and discharge middle voltage, low the charge middle charge voltage. Although Ca(OH)2resulted in more difficult activation, EIS showed that the charge-transfer resistance was lower than that of the pure ZnO nanomaterials.