High Performance Lithium‐Ion Batteries Using Layered 2H‐MoTe₂ as Anode

Abstract

The major challenges faced by candidate electrode materials in lithium‐ion batteries (LIBs) include their low electronic and ionic conductivities. 2D van der Waals materials with good electronic conductivity and weak interlayer interaction have been intensively studied in the electrochemical processes involving ion migrations. In particular, molybdenum ditelluride (MoTe2) has emerged as a new material for energy storage applications. Though 2H‐MoTe2 with hexagonal semiconducting phase is expected to facilitate more efficient ion insertion/deinsertion than the monoclinic semi‐metallic phase, its application as an anode in LIB has been elusive. Here, 2H‐MoTe2, prepared by a solid‐state synthesis route, has been employed as an efficient anode with remarkable Li+ storage capacity. The as‐prepared 2H‐MoTe2 electrodes exhibit an initial specific capacity of 432 mAh g−1 and retain a high reversible specific capacity of 291 mAh g−1 after 260 cycles at 1.0 A g−1. Further, a full‐cell prototype is demonstrated by using 2H‐MoTe2 anode with lithium cobalt oxide cathode, showing a high energy density of 454 Wh kg−1 (based on the MoTe2 mass) and capacity retention of 80% over 100 cycles. Synchrotron‐based in situ X‐ray absorption near‐edge structures have revealed the unique lithium reaction pathway and storage mechanism, which is supported by density functional theory based calculations.

Zirconium‐Doped Vanadium Oxide and Ammonium Linked Layered Cathode to Construct a Full‐Cell Magnesium‐Ion Battery: A Realization and Structural, Electrochemical Study

“…Here, at the fully discharged state, the Zr‐NVO electrode showed a ∼0.03–0.33 eV energy shift to a lower value than the pristine state (@OCV) (Table S8). The obtained energy shift compared with the existing literature, [13,52–59] further confirmed the reduction of V 5+ and V 4+ for the pristine electrode @ OCV, reduced to their corresponding lower charge states of vanadium during the discharge process, which are consistent with the XPS and obtained electrochemical results.…”

“…the pre‐edge due to dipole forbidden 1s–3d transition, which appears because of the distortion in the octahedral symmetry due to the mixing of V‐3d states with oxygen‐2p states [52] . The main absorption edge corresponds to 1s–4s monopole transition and the white line refers to the dipole 1s–4p transition [13,50,51,53] …”

A Review on the Current Progress and Challenges of 2D Layered Transition Metal Dichalcogenides as Li/Na‐ion Battery Anodes

“…Very recently, Panda et al . reported 2H MoTe 2 which exhibited very high performance when employed as LIB anode [117a] . The 2H MoTe 2 was synthesized via solid‐state synthesis routes where Molybdenum and Tellurium were used as the precursors and the sintering was carried out at 800 °C temperature in inert condition.…”

Sodium‐Ion Battery Full‐Cell Study with a Pseudocapacitive MoSe2‐Porous N‐Doped Carbon Composite Anode and Intercalated Sodium Vanadium Fluorophosphate Cathode

“…The ex‐situ X‐ray absorption near the edge (XANES) and Extended X‐ray absorption fine structure (EXAFS) experiments were performed in fluorescence mode at the Energy Scanning EXAFS beamline (BL‐9) at Indus‐2 Synchrotron source, Raja Ramanna Centre for Advanced Technology (RRCAT), Indore. The detailed beamline specifications are discussed in the supporting information and our earlier publications [50–52] …”