文献类型：期刊文献

英文题名：Grafting polyethyleneimine on electrospun nanofiber separator to stabilize lithium metal anode for lithium sulfur batteries

作者：Hu, Mengfei[1];Ma, Qingyan[1];Yuan, Yuan[1];Pan, Yankai[1];Chen, Mingqi[1];Zhang, Yayun[1];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China

年份：2020

卷号：388

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20200708156131);WOS:【SCI-EXPANDED(收录号:WOS:000533524900006)】；

基金：This work was partly supported by National Natural Science Foundation of China (No. 21878091 and No. 21576090), China, and Fundamental Research Funds for the Central Universities (222201718002), China.

语种：英文

外文关键词：Lithium dendrites; Polysulfides shuttle; Lithium-sulfur batteries; Electrospinning; Nanofiber separator

摘要：High-energy-density lithium sulfur (Li-S) batteries are suffering several seemingly insurmountable barriers, including lithium dendrite formation and polysulfides shuttling. Functional separator, which bridges anode, electrolyte and cathode together, has the potential to offer a perfect solution to these concerns. Herein, we develop a functional ammoniated polyacrylonitrile (PAN) nanofiber separator (APANF) which can simultaneously inhibit Li dendrite formation and polysulfides shuttling. Branched polyethyleneimine (PEI) are fixed on the electrospun PAN nanofiber mat via a chemical grafting to provide amino groups. Such strongly polar separator can well regulate the uniform Li ions distribution and induce the formation of the Li3N-rich SEI layer, resulting in an interesting 3D spherical and dendrite-free Li deposit pattern. The coulombic efficiency of resulting Li anode can be improved up to 98.8% with a low overpotential of 15 mV. Meanwhile, the separator can also serve as a block for polysulfides shutting due to the strong chemical adsorption capability of PEI, thus facilitating the capacity retention of sulfur cathode. This work provides an easy and scalable alternative to conventional polyolefin separators for solving problems in both anode and cathode of Li-S battery.