Tuning Pseudocapacitance via C–S Bonding in WS₂ Nanorods Anchored on N,S Codoped Graphene for High-Power Lithium Batteries

Abstract

Pseudocapacitance plays an important role in high-power lithium-ion batteries (LIBs). However, it is still lack of effective methods to tailor the pseudocapacitance contribution in electrode materials for LIBs. Herein, pseudocapacitance tuned by the strength of C-S bonding has been rendered in WS nanorods anchored on the N,S codoped three-dimensional graphene hybrid (WS@N,S-3DG) for the first time. The pseudocapacitive contributions in the charge storage can be enhanced effectively with the increased strength of C-S bonding. As expected, the enhanced extrinsic pseudocapacitance makes WS@N,S-3DG a fascinating electrode material for high-power LIBs, with a high reversible capacity of 509 mA h g over 500 cycles at a current density as high as 2 A g. These encouraging results of pseudocapacitance tailored by chemical bonding provide new opportunities for designing advanced electrode materials.

Double Morphology of Co9S8 Coated by N, S Co-doped Carbon as Efficient Anode Materials for Sodium-Ion Batteries

“…Carbon coating can not only enhance the conductivity of TMSs, but also remit the stress stemming from the volume expansion. In particular, with the heteroatom doping, the electronic structure of carbon can be modified to improve the physical and chemical properties by generating extrinsic defects, expanding the interlayer distance and offering additional electron transfer route when heteroatoms are bonded with carbon atoms [40][41][42][43][44].…”

Heterostructured Nanocube‐Shaped Binary Sulfide (SnCo)S2 Interlaced with S‐Doped Graphene as a High‐Performance Anode for Advanced Na+ Batteries

“…On the other hand, the C‐1s spectrum of (SnCo)S 2 /SG shown in Figure F exhibits four peaks at 284.1, 284.9, 285.6, and 288.0 eV, corresponding to CC/CC, CO, CS, and OCO bonds, respectively. In addition, the new peak at 164.1 eV in the S‐2p spectrum is ascribed to the C‐S bond (Figure S6C, Supporting Information), which is in good agreement with the C‐1s spectrum . It is important to know that the existence of CS bond is the evidence of S‐doping into rGO nanosheets as well as strong chemical bonding between (SnCo)S 2 and rGO nanosheets; this suggests that intimate heterostructures have also been formed between (SnCo)S 2 and rGO nanosheets, which may play a critical role in stabilizing (SnCo)S 2 structure and providing high electronic conductivity for long‐cycle operation …”

Few-layer WS2nanosheets with oxygen-incorporated defect-sulphur entrapped by a hierarchical N, S co-doped graphene network towards advanced long-term lithium storage performances

“…For the O-DS-WS 2 /NSG nanocomposites, the rst stage of weight loss below approximately 100 C is attributed to the removal of free water and physically adsorbed water, and the weight loss above 100 C corresponds to the oxidation of NSG and WS 2 . 22,40 According to calculation, the WS 2 content in the O-DS-WS 2 /NSG-650, O-DS-WS 2 /NSG-800, O-DS-WS 2 /NSG-950 is 53.4 wt%, 64.9 wt% and 79.6 wt%, respectively. Raman spectrum was performed to further characterize the structure of WS 2 and actual carbon.…”