A lightweight nitrogen/oxygen dual-doping carbon nanofiber interlayer with meso-/micropores for high-performance lithium-sulfur batteries

• 作者: Fangyuan Hu Hao Peng Tianpeng Zhang Wenlong Shao Siyang Liu Jinyan Wang Chenghao Wang Xigao Jian
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（7）
• 页码范围: 115-123
• 页数: 9页
• 语种: 英文

摘要

Lithium-sulfur (Li-S) batteries are promising energy-storage devices for future generations of portable electronics and electric vehicles because of the outstanding energy density,low cost,and nontoxic nature of S.In the past decades,various novel electrodes and electrolytes have been studied to improve the performance of Li-S batteries.However,the very limited lifespan and rate performance of Li-S batteries originating from the dissolution and diffusion of long-chain polysulfides in liquid electrolytes,and the intrinsic poor conductivity of S severely hinder their practical application.Herein,an electrospinning method was developed to fabricate a thin conductive interlayer consisting of meso-/microporous N/O dual-doping carbon nanofiber (CNF).The freestanding 3D interwoven structure with conductive pathways for electrons and ions can enhance the contact between polysulfides and N/O atoms to realize the highly robust trapping of polysulfides via the extremely polar interaction.Consequently,combining the meso-microporous N/O dual-doping CNF interlayer with a monodispersed S nanoparticle cathode results in a superior electrochemical performance of 862.5 mAh/g after 200 cycles at 0.2 C and a cycle decay as low as 0.08％ per cycle.An area specific capacity of 5.22 mAh/cm2 can be obtained after 100 cycles at 0.1 C with a high S loading of 7.5 mg/cm2.