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Structure and electrochemical properties of CNT-supported Li-Ti-O anode material for Li-ion battery
Freddy Baltazar Iniguez,정희민,Ahmed Yousef Mohamed,말도나도노잘레스폴,최환준,정순기,JONG BAE PARK,김양수,조덕용 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
We investigated the structural and electrochemical properties of Li-Ti-O (LTO) and carbon nanotube(CNT)-added LTO for anode material in secondary Li-ion batteries using various techniques. The studyfocused on elucidating the effects of the microstructural evolution in LTO and the CNT addition on batteryfunctionality. For all the tested compositions of LTO ([Li]/[Ti] = 0.9, 1.0 and 1.22), the system is fully oxidizedto comprise a mixed-phase having Li4+2dTi5O12+d (d’s are approximately 0.14, 0.25, and 0.65, respectively)and Li2TiO3 structures. The results of the half-cell tests show a decrease in charge/dischargecapacity with increasing [Li]/[Ti] ratio, and the detailed structural and chemical analyses unequivocallyreveal that the such degradation in the electrochemical property originates mainly from the increaseof Li content (d). Meanwhile, after adding CNT, the Li capacity becomes greatly increased while theLTO composition and the redox kinetics do not change significantly. The origin of the improved specificcapacity is associated with the formation of micron-sized structures at the surface of the LTO particles. Thereby we demonstrate that surface engineering via the CNT addition is a promising way to improvethe performance of the LTO-based anode material.