Graphene oxide coated nanosheet‐like γ‐MnS@KB‐S fabricated by spray drying for high energy density Li‐S batteries

Summary In order to prohibit the shuttle influence of lithium polysulfides in lithium sulfur battery, a kind of graphene oxide (GO) coated γ‐MnS@KB‐S (GO@MKB‐S) composite cathode material was successfully fabricated. First of all, the γ‐MnS@KB (MKB) composite powders were prepared via a solvothermal reaction, then a spray drying method was used to obtain GO@MKB‐S composites, which displays core/shell nanostructure. SEM, TEM, XRD as well as Raman spectrum are implemented to look into the microstructures and the functions of the 2D nanosheet‐like γ‐MnS in setting in KB on the battery performance were carefully analyzed. It is demonstrated that electrochemical discharge capacity and rate performance are clearly improved by using GO@MKB‐S composites compared to the cathode electrode of the GO coated KB‐S (GO@KB‐S). With a sulfur loading of 5 mg cm−2, the cathode electrode of GO@MKB‐S shows a considerable discharge capacity of 749.9 mAh g−1 at 0.36 C. Additionally, the Li‐S battery cycle retention of GO@MKB‐S sample maintains 97.36% after 100 cycles and 78.69% after 200 cycles. Graphene Oxide (GO) coated γ‐MnS@KB‐S is successfully fabricated via a spray drying method. The 2D nanosheet‐like γ‐MnS owns strong chemical affinity for lithium polysulfides and high catalytic activity to promote the redox process.GO@MKB‐S cathode shows a considerable discharge capacity and cycle stability at a high sulfur area loading of 5 mg cm−2