材料科学
涂层
化学工程
吸附
锂(药物)
氮化硼
电化学
催化作用
兴奋剂
储能
纳米技术
杂原子
电极
有机化学
化学
物理化学
内分泌学
工程类
功率(物理)
物理
医学
量子力学
光电子学
戒指(化学)
作者
Jingwen Yang,Wei Qiao,Jiaxiao Qiao,Hejun Gao,Zexia Li,Peng Wang,Chaochao Cao,Chengchun Tang,Yanming Xue
标识
DOI:10.1021/acsami.2c11087
摘要
Lithium–sulfur (Li–S) batteries with high theoretical energy density are considered as the most promising devices for rechargeable energy-storage systems. However, their actual applications are rather limited by the shuttle effect of lithium polysulfides (LiPSs) and the sluggish redox kinetics. Here, the boron nitride nanosheets are homodispersedly embedded into N-doping porous carbon fibers (BNNSs/CHFs) by an electrospinning technique and a subsequent in situ pyrolysis process. The hybridized BNNSs/CHFs can be smartly designed as a multifunctional separation coating onto the commercial PP membrane to enhance the electrochemical performance of Li–S batteries. As a result, the Li–S batteries with extra BNNSs/CHF modification deliver a highly reversible discharge capacity of 830.4 mA h g–1 at a current density of 1 C. Even under 4 C, the discharge specific capacity can reach up to 609.9 mA h g–1 and maintain at 553.9 mA h g–1 after 500 cycles, showing a low capacity decay of 0.01836% per cycle. It is considered that the excellent performance is attributed to the synergistic effect of adsorption and catalysis of the BNNSs/CHF coating used. First, this coating can efficiently reduce the charge transfer resistance and enhance Li-ion diffusion, due to increased catalytic activity from strong electronic interactions between BNNSs and N-doping CHFs. Second, the combination of polar BNNSs and abundant pore structures within the hybridized BNNSs/CHF networks can highly facilitate an adsorption for LiPSs. Here, we believed that this work would provide a promising strategy to increase the Li–S batteries’ performance by introducing hybridized BNNSs/N-doping carbon networks, which could efficiently suppress the LiPSs’ shuttle effect and improve the electrochemical kinetics of Li–S batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI