ACS Applied Materials & Interfaces 2015-08-05

Interfacial Adsorption and Redox Coupling of Li4Ti5O12 with Nanographene for High-Rate Lithium Storage.

Seongjun Bae, Inho Nam, Soomin Park, Young Geun Yoo, Sungju Yu, Jong Min Lee, Jeong Woo Han, Jongheop Yi

Index: ACS Appl. Mater. Interfaces 7 , 16565-72, (2015)

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Abstract

Despite the many efforts to solve the problem associated with lithium storage at high rates, it is rarely achieved up until now. The design with experimental proof is reported here for the high rate of lithium storage via a core-shell structure composite comprised of a Li4Ti5O12 (LTO) core and a nanographene (NG) shell. The LTO-NG core-shell was synthesized via a first-principles understanding of the adsorption properties between LTO and NG. Interfacial reactions are considered between the two materials by a redox coupling effect. The large interfacial area between the LTO core and the NG shell resulted in a high electron-conducting path. It allowed rapid kinetics to be achieved for lithium storage and also resulted in a stable contact between LTO and NG, affording cyclic performance stability.