Photo-electrooxidiation of I- and Photo-assistant Rechargeable Secondary Li-ion Battery

doi:10.7503/cjcu20120572

Abstract

Abstract:

The structure, micro-morphology, particle size and photo-electrochemical behavior of TiO₂ powder in I^- contained PC electrolyte were investigated by XRD, SEM and micro-cavity electrode. The results indicate that the size of used TiO₂ sample is from 100 nm to 200 nm. The results indicate that the potential of oxidation of I^- on anatase-TiO₂ is 1 V at irradiation condition, lower than that of oxidation of I^- at dark condition. Furthermore, a type of photo-assistant rechargeable Li-ion battery was composed by anatase-TiO₂/ITO semi-conductor photo-anode, poly(vinylidene fluoride)(PVDF) membrane and Li₄Ti₅O₁₂ negative electrode. The charging voltage of such battery is 0.9 V at irradiation condition lower than that of the battery at dark condition. The results of UV-Vis spectroscopy indicate that the charging product of anode half-cell is I₂. At the same time, the Li-ion insertion reaction happens on Li₄Ti₅O₁₂ negative electrode. The total photo-assistant charging reaction of battery is listed as follows: 3LiI+Li₄Ti₅O₁₂+3hν(3/2)I₂+Li₇Ti₅O₁₂. The results suggest that such batteries can be used as model for the development of next generation photo-assistant rechargeable Li-ion battery.

Key words: Photo-electrooxidization, Micro-cavity electrode, Divided cell, Li-ion battery, Li₄Ti₅O₁₂

CLC Number:

O646
TM911

TrendMD:

WU Feng, XIE Xiao-Yi, ZHANG Cun-Zhong, MU Dao-Bin, WU Bo-Rong. Photo-electrooxidiation of I^- and Photo-assistant Rechargeable Secondary Li-ion Battery[J]. Chem. J. Chinese Universities, 2013, 34(4): 980.

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Photo-electrooxidiation of I^- and Photo-assistant Rechargeable Secondary Li-ion Battery

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