Porous-layered GO@S/SFAC composites for suppressing shuttle effect in lithium-sulfur batteries

摘要

This study designed and synthesized porous-layered GO@S/SFAC composites to solve the capacity fading problem of lithium-sulfur batteries, which is caused by the shuttle effect. In the composites, the inner porous sisal fiber activated carbon (SFAC) provides a framework for accommodating active sulfur as a host; The outer layered graphene oxide (GO) restricts the dissolution and migration of polysulfides through physical confinement and chemical adsorption. As the cathode of the lithium-sulfur battery, the initial discharge specific capacity of the GO@S/SFAC composites is 1364 mAh g-1, and the discharge specific capacity is maintained at 658 mAh g-1 after 100 cycles at 0.1C. Compared with the sulfur cathode, the electrochemical performance is significantly improved and the shuttle effect is effectively suppressed.

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