Co0.85Se@C/Ti3C2Tx MXene hybrids as anode materials for lithium-ion batteries

Abstract

The volumetric capacity plays a critical role in lithium-ion batteries (LIBs) on account of the restrictive electrode material. Herein we report a novel electrode material of Co0.85Se@C/Ti3C2Tx MXene hybrids (CSTCs) with high volumetric capacities are prepared by ultrasonication of Ti3C2Tx MXene and Co0.85Se@C nanoparticles. These samples are systematically characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, and energy dispersive spectroscopy. The electrochemical performance of these samples as anode materials for LIBs are also studied. Owing to the opened two-dimensional structure, good electrochemical property, and weak Li+ diffusion resistance, these materials exhibit good electrochemical properties. The CSTC3 sample delivers the maximum reversible capacity, up to 700 mA h g−1 at 0.1 A g−1, corresponding to a very high volumetric capacity of 2044 mA h cm−3 due to its high compact density. This hybrid is considered to be a promising anode material in small-size wearable or portable electronic devices.