Three-Dimensional Hierarchical MoSe₂/N, F Co-Doped Carbon Heterostructure Assembled by Ultrathin Nanosheets for Advanced Lithium-Ion Batteries

Abstract

MoSe2 has attracted great interest as an anode material for lithium-ion batteries (LIBs) thanks to its high capacity. Nevertheless, the poor cycle performance caused by the huge volume change during the lithiation/delithiation process seriously limits its practical application in LIBs. Herein, a 3D hierarchical MoSe2/N, F co-doped carbon (MoSe2/NFC) heterostructure is prepared via a simple method. Notably, the N, F co-doped heterostructure can expand the (002) plane of MoSe2, which contributes in facilitating Li+ insertion/extraction. Furthermore, N, F co-doped carbon confined MoSe2 nanosheets to form a 3D hierarchical heterostructure, leading to fast electron/ion transfer, buffering of the volume change, and prevention of the aggregation of MoSe2 nanosheets during the repeated discharge/charge process. Therefore, the MoSe2/NFC composite exhibits good rate performance and ultra-long cycling life when applied in LIBs. A high capacity of 452.9 mAh g–1 is maintained at 5 A g–1, and a high capacity of 598.3 mAh g–1 is obtained after 1000 cycles at 2 A g–1.

A Composite of Two Dimensional GeSe2/Nitrogen‐Doped Reduced Graphene Oxide for Enhanced Capacitive Lithium‐Ion Storage

“…In recent years, substantial efforts have been made to develop the new anodes with high power/energy density and superior cycling life for LIBs. Metal selenides, such as MoSe 2 , [1][2] CoSe x , [3][4] WSe 2 , [5] SnSe 2 [6][7] and GeSe 2 , [8][9] have received much attention owing to their rich redox chemistry, high specific capacities and better electrical conductivity compared to their oxide counterparts. On the other hand, the weaker bonding of metal-selenium improves the reversibility of the conversion reaction during the charge and discharge process.…”

Enhancing Mg2+ and Mg2+/Li+ Storage by Introducing Active Defect Sites and Edge Surfaces in MoSe2

“…In Li or Na ion batteries, it has been reported that the energy storage mechanism of MoSe 2 electrode is the mixed reaction of intercalation reaction and conversion reaction [20,35] . During the discharge process, Li x MoSe 2 is formed by the intercalation of Li ions into MoSe 2 , and then Li x MoSe 2 is reduced to Mo and Li 2 Se with the progress of discharge.…”

“…Hence, such features give the MoSe 2 great potential as cathode material for metal‐ion batteries, which enable fast charge and ion transfer during charge/discharge process [17,18] . So far, there have been a number of works with regard to the MoSe 2 based electrode materials for metal‐ion batteries, such as carbon‐stabilized MoSe 2 nanosheets for the sodium ion batteries (SIBs), [19] hierarchical MoSe 2 /N, F co‐doped carbon heterostructure for the lithium ion batteries (LIBs), [20] hierarchical MoSe 2 hollow spheres for the LIBs [21] . However, there are few reports on the MoSe 2 based electrodes for Mg or Mg/Li ion batteries.…”

Recent Developments of Two-Dimensional Anode Materials and Their Composites in Lithium-Ion Batteries

“…The strategy takes the advantage of the unchanged material crystal structure, and the original excellent properties can be reflected in the recombination process. Hybridization process consists of a variety of materials, mainly carbon-based materials such as graphene and CNTs, as well as some monocrystalline silicon, oxides, and sulfides. − Li et al reported the SN-G/Si composite material synthesized by S–N co-doped graphene and nanosilicon particles (Figure a–c). The SN-G/Si for LIBs could provide a high capacity of 2020 mAh g –1 , and the Coulombic efficiency was close to 97% (Figure d).…”