Facile Synthesis of Rutile Phase Tinbo4 from 2d Tinbc Mxene for High-Rate Lithium-Ion Battery Anodes

Abstract

Rutile phase titanium niobate (TiNbO4) has garnered significant interest as a novel anode material for lithium-ion batteries (LIBs) due to its distinct crystal structure and intrinsic pseudocapacitance, which offer superior electrochemical performance. Nonetheless, the stringent preparation conditions for rutile TiNbO4 have hindered its further development. Herein, we propose an innovative approach to synthesize rutile phase TiNbO4, derived from a 2D TiNbC MXene precursor via one-step thermal treatment in air. This rutile phase TiNbO4 features intrinsic pseudocapacitive nature, storing lithium ions through an intercalation pseudocapacitive mechanism with no phase transition. The stable crystal structure and abundant oxygen vacancies facilitate electron transfer, resulting in robust cycle performance with a capacity retention rate of 89.1% after 1600 cycles at 10 C. This work not only simplifies the synthesis of rutile phase TiNbO4, but also provides a novel approach for preparing other niobium-based oxides from MXene phases.

Keywords: TiNbO4, MXene derivative, Intrinsic pseudocapacitance, Anode, Lithium-ion batteries