High-Performance Lithium-Ion-Based Dual-Ion Batteries Enabled by Few-Layer MoSe<sub>2</sub>/Nitrogen-Doped Carbon
Cheng Zheng, Junxiu Wu, Yafeng Li, Xingjiang Liu, Lingxing Zeng, Mingdeng Wei
Abstract
A hierarchically porous nanocomposite of few-layer MoSe2/nitrogen-doped carbon (MoSe2/NC) has been synthesized through an efficient route combining a sol–gel method and annealing techniques. Furthermore, a lithium-ion-based dual-ion battery configuration using the MoSe2/NC nanocomposite as the anode and commercial graphite as the cathode (MoSe2/NC-G Li-DIB) has been proposed for the first time and demonstrated a reversible discharge capacity of 86 mA h g–1 at 2C (1C = 100 mA g–1) after 150 cycles and a high rate capability up to 76 mA h g–1 even at 20C within an operating voltage region as high as 2.0–5.0 V. These remarkable electrochemical properties are mainly attributed to the unique composition and construction of the MoSe2/NC nanocomposite in which the hierarchically porous nitrogen-doped carbon matrix not only helps to homogeneously disperse the in situ-formed few-layer MoSe2 nanosheets, shortening the Li+ diffusion pathway and exposing more active sites for Li+ storage, but also enhances the electrical conductivity and alleviates the volume changes during the cycling process.