Nanocrystalline SnS₂coated onto reduced graphene oxide: demonstrating the feasibility of a non-graphitic anode with sulfide chemistry for potassium-ion batteries

Abstract

An anode material incorporating a sulfide is reported. SnS nanoparticles anchored onto reduced graphene oxide are produced via a chemical route and demonstrate an impressive capacity of 350 mA h g, exceeding the capacity of graphite. These results open the door for a new class of high capacity anode materials (based on sulfide chemistry) for potassium-ion batteries.

Interlayer Expanded SnS2 Anchored on Nitrogen‐Doped Graphene Nanosheets with Enhanced Potassium Storage

“…The formation of C=N bond indicates that the chemical bond has formed by heteroatoms doping into graphene. Moreover, as depicted in Figure f, the N 1s spectrum is also carried out and the spectrum can divide into several peaks at 402.1, 400.3 and 398.8 eV, which can be matched well with graphitic‐N, pyrrolic‐N and pyridinic‐N, respectively ,. The XPS results imply that the intense coupling effect at the heterointerface produced by electron cloud migration via heteroatoms doping will effectively increase the reactive sites for K + storage and extremely accelerate charge transfer.…”

“…Gao has prepared CoS nanoclusters anchored on graphene ultrathin sheets to provide a sturdy structure and alleviate the electrochemical deteriorate, these composite could deliver an excellent capacity of 310.8 mAh g −1 after 100 cycles . Moreover, Lakshmi has reported a nanocrystalline SnS 2 decorated on graphene nanosheets, achieving a reverse capacity of 350 mAh g −1 in storage K + ions . Nevertheless, the application of transition metal sulfides in PIBs is faced with two primary challenges which have also encountered in LIB and SIB: (1) The narrow interlayer spacing of transition metal sulfide will immensely hinder the transfer of larger radius of K + ions, causing inferior electrochemical kinetics and unsatisfied long‐term cyclic stability ,.…”

Rechargeable potassium-ion batteries with honeycomb-layered tellurates as high voltage cathodes and fast potassium-ion conductors

“…Whilst major breakthroughs have been reported in the use of graphite 24 , phosphorus 25 , oxides (such as K 2 Ti 8 O 17 26 , K 2 Ti 4 O 9 27 , Co 3 O 4 -Fe 2 O 3 composites 28 , etc.) and sulphides (namely, MoS 2 29 and SnS 2 30 ) as anode materials, identifying cathode frameworks that can facilitate reversible K-ion insertion is a daunting challenge. This can be attributed to the huge stress imparted in the host structures during K-ion reinsertion leading to structural collapse, as well as the difficulties in the preparation and handling of these materials due to hygroscopicity, thus debilitating the choice of cathode materials.…”

Surface‐Confined SnS2@C@rGO as High‐Performance Anode Materials for Sodium‐ and Potassium‐Ion Batteries

“…Considering its high electrochemical performance in LIBs and SIBs, SnS 2 ‐based electrode is expected to exhibit superior K + storage capability. However, reports on SnS 2 ‐based anode materials for PIBs are scarce and the reported reversible capacity is still relatively low and unsatisfactory in view of its excellent electrochemical performance in LIBs and SIBs. Moreover, the structure evolution and phase transformation during the potassiation/de‐potassiation process is still unclear, which motivated us to get deeper insight into the K + ‐storage mechanisms of SnS 2 ‐based electrode, and further construct a relationship between its microstructure and K + ‐storage capabilities.…”