Controllable solvo-hydrothermal electrodeposition of lithium vanadate uniform carnation-like nanostructure and their electrochemical performance |
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Authors: | Xueliang Li Peipei Li Mei Luo Xiangying Chen Jiejie Chen |
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Institution: | (1) Anhui Key Laboratory of Controllable Chemistry Reaction and Material Chemical Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China |
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Abstract: | In this paper, we successfully developed a novel method to synthesize uniform carnation-like lithium vanadate nanostructures
by combining electrochemical deposition and solvo-hydrothermal method. The samples were characterized by field emission scanning
electron microscopy, power X-ray diffraction, and thermogravimetric analysis. The results show that the LiV3O8·H2O carnation-like nanostructure is 2–3 μm in diameter and assembled from nanosheets with thickness of 10–20 nm. Based on a
series of experiments, we proposed a possible growth mechanism, in which the supersaturation derived from electric field and
high conductivity under solvo-hydrothermal conditions due to the successive growth of lithium vanadate. In our work, we have
discussed three different solvo-hydrothermal systems. It is proved that the morphology of coating materials could be conveniently
controlled by selecting alcohols with different chain of alkyl. Compared with short-chain alcohol, CH3–(CH2)6–CH2–OH was beneficial to promote the oriented growth of nanosheets. Electrochemical performances of lithium vanadate cathode
materials were characterized by galvanostatic charge–discharge, and LiV3O8 synthesized in n-octanol aqueous solution exhibits the highest capacity of 357 mAh g−1 and best cycle stability. Furthermore, the influence of solvo-hydrothermal conditions on the morphology and electrochemical
performance of products has also been studied. |
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