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Recently, Zhang Yuegang's research group at the Suzhou Institute of Nano Sciences, Chinese Academy of Sciences, used polyaniline to improve graphene oxide nano-sulfur composites, reduce the charge transfer resistance of lithium-sulfur battery electrode materials, inhibit the dissolution of lithium polysulfide, and improve the discharge specific capacity, coulombic efficiency and cycle stability
of the composites.
It is understood that in order to improve the conductivity of composite sulfur graphene nanomaterials and inhibit the shuttle effect of lithium polysulfide, the members of the research group used ammonia gas to nitride graphene oxide and wrapped S nanoparticles in nitrogen-doped graphene sheets (S@NG).
The lithium-sulfur battery assembled by the composite material shows high specific capacity and stability at different rates, and the battery has a long cycle life, and the average capacity decay rate per cycle obtained by 2000 charge and discharge tests is only 0.
028%.
The excellent performance of the material is attributed to the excellent adsorption of N functional groups in nitrogen-doped graphene sheets to lithium polysulfide and the excellent conductivity of nitrogen-doped graphene, and the results also confirm that lithium-sulfur batteries based on S@NG composite materials have great application prospects
in energy storage fields such as portable electronics and new power energy.
(Book)
S@NGS@NG
