层状双氢氧化物
材料科学
电化学
煅烧
循环伏安法
介电谱
锂(药物)
电容
化学工程
超级电容器
溶剂热合成
水溶液
纳米技术
无机化学
电极
氢氧化物
化学
有机化学
物理化学
医学
工程类
内分泌学
催化作用
作者
Jinbo Wei,Zan Gao,Yifan Song,Wanlu Yang,Jun Wang,Zhanshuang Li,Tom Mann,Milin Zhang,Lianhe Liu
标识
DOI:10.1016/j.matchemphys.2012.12.005
摘要
In this paper, for the first time, Li/Al layered double hydroxides (LDHs) were synthesized by a facile and environment-friendly solvothermal approach. X-ray diffraction patterns show that the as-prepared products belong to the hexagonal phase. Well-defined LDHs particles with spiral-shape (1–2 μm), hexagonal (2–3 μm) and petal-like structures (10–15 μm) have been successfully fabricated by adjusting the content of water/ethanol in the synthesis process. A possible growth mechanism was proposed for the formation of these structures. Their electrochemical performances were investigated by cyclic voltammetry, galvanostatic charge/discharge test and electrochemical impedance spectroscopy. The hexagonal Li/Al LDHs calcined at 450 °C exhibit the specific capacitance of 848 F g−1 at a current density of 1.25 A g−1. The high specific capacitance and remarkable rate capacity of Li/Al LDHs are promising for applications in capacitors and low-cost aqueous lithium ion batteries.
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