Engineering the morphology/porosity of oxygen-doped carbon for sulfur host as lithium-sulfur batteries

• 作者: Limin Zhang Wenqing Zhao Shaohui Yuan Feng Jiang Xingqi Chen Yue Yang Peng Ge Wei Sun Xiaobo Ji
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 531-545
• 页数: 15页
• 语种: 英文

摘要

Despite the intriguing merits of lithium-sulfur(Li-S)systems,they still suffer from the notorious"shuttling-effect"of polysulfides.Herein,carbon materials with rational tailoring of morphology and pores were designed for strong loading/adsorption with the controlling of energy-storage ability.Through rational tailoring,it is strongly verified that such engineering of evolutions result in variational of sulfur immobilization in the obtained carbon.As expected,the targeted sample delivers a stable capac-ity of 925 mAh g-1 after 100 loops.Supporting by the"cutting-off'manners,it is disclosed that meso-pores in carbon possess more fascinated traits than micro/macropores in improving the utilization of sulfur and restraining Li2Sx(4≤x≤8).Moreover,the long-chain polysulfide could be further consoli-dated by auto-doping oxygen groups.Supported by in-depth kinetic analysis,it is confirmed that the kinetics of ion/e-transfer during charging and discharging could be accelerated by mesopores,especially in stages of the formation of solid S8 and Li2S,further improving the capacity of ion-storage in Li-S bat-tery.Given this,the elaborate study provide significant insights into the effect of pore structure on kinetic performance about Li-storage behaviors in Li-S battery,and give guidance for improving sulfur immobilization.