Abstract
An efficient, industry-accepted spray drying method was used to synthesize micro-spherical sulfur/graphene oxide (S/GO) composites as cathode materials within lithium sulfur batteries. The as-designed wrapping of the sulfur-nanoparticles, with wrinkled GO composites, was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The unique morphological design of this material enabled superior discharge capacity and cycling performance, demonstrating a high initial discharge capacity of 1400 mAh g−1 at 0.1 C. The discharge capacity remained at 828 mAh g−1 after 150 cycles. The superior electrochemical performance indicates that the S/GO composite improves electrical conductivity and alleviates the shuttle effect. This study represents the first time such a facile spray drying method has been adopted for lithium sulfur batteries and used in the fabrication of S/GO composites.
Highlights
Advanced power sources have been commonly employed in the mobile electronic device and hybrid electric vehicle markets [1,2,3,4,5]
The results indicated that the homogeneous distribution of wrinkled spherical sulfur micro-particles in the graphene oxide conductive network enhanced wrinkled spherical sulfur micro-particles in the oxide improving conductive the network enhanced effective effective electrolyte contact and increased thegraphene reaction area, discharge capacity and electrolyte contact and increased the reaction area, improving the discharge capacity and cycling cycling performance of the lithium sulfur batteries
GO was synthesized from natural graphene using the optimized Hummers method
Summary
Advanced power sources have been commonly employed in the mobile electronic device and hybrid electric vehicle markets [1,2,3,4,5]. Lithium sulfur batteries show great potential for large-scale application in various green energy fields, due to the ultra-high theoretical capacity of sulfur, reaching. Sulfur has the advantages of being inexpensive, environmentally benign, and naturally abundant, making it attractive for practical applications [10,11]. There are some intrinsic issues that have plagued sulfur cathodes. The low electronic conductivity of sulfur leads to poor electrochemical performance and low utilization during charging and discharging processes. The high dissolution of intermediate polysulfides in electrolyte solvents is another important issue to consider when designing long cycle-life sulfur composite electrodes [12]
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