Hydrothermal synthesis of a three-dimensional nitrogen-doped graphene cathode for lithium–sulfur batteries

• Main Authors: KANG, JIA-HAO, 康家豪
• Other Authors: CHEN, JENN-SHING
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/ct9j8c

碩士 === 國立高雄大學 === 應用化學系碩士班 === 106 === Lithium-sulfur batteries with a high theoretical energy density are regarded as promising energy storage devices for electric vehicles and large-scale electricity storage. But their practical use is still hindered by several issues including dissolution of lithium polysulfides(LiPSS) in the electrolyte, large volume change between the sulfur (S) and lithiated phase(Li2S), low electronic conductivity of sulfur. In this work, three-dimensional nitrogen-doped graphene by hydrothermal synthesis, as a chemical immobilizer, was designed to bind LiPSS and stabilize sulfur in the cathode for high performance Li-S batteries. The incorporated ni-trogen dopants in the graphene network were found to have a strong binding effect on the LiPSs to improve electrochemical stability and promote fast electrochemical reaction kinetics. Here we report the three-dimensional N-doped graphene as cathode for lithium-sulfur batteries, and the initial discharge capacity is 1253 mAh/g, after 50 cycles, the capacity retention is 80.1%