A F-doped tree-like nanofiber structural poly-m-phenyleneisophthalamide separator for high-performance lithium-sulfur batteries
A F-doped tree-like nanofiber structural poly-m-phenyleneisophthalamide separator for high-performance lithium-sulfur batteries
复制标题
用于高性能锂硫电池的氟掺杂树状纳米纤维结构聚间苯二甲酰间苯二胺隔膜
DOI：
10.1016/j.jpowsour.2017.07.047
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发表时间：
2017-09-15
影响因子：
9.2
通讯作者：
Cheng, Bowen
中科院分区：
文献类型：
--
作者：
Deng, Nanping;Wang, Yan;Cheng, Bowen
本研究采用一步电纺法制备了F掺杂树状纳米纤维结构的聚间苯基间苯二甲酰胺(PMIA)膜，并对其作为锂硫电池隔膜的应用性能进行了研究。掺F的PMIA膜可以作为基质，形成凝胶聚合物电解质。F掺杂使PMIA膜具有极高的电解质吸收率、良好的保存液体电解液的能力和对多硫化物的化学吸附能力。树状结构通过物理约束有效地阻挡了多硫化物。采用F掺杂PMIA隔板的锂硫电池首次放电容量高达1222.5 mAHg(-1)，循环稳定性好，容量保持率高达745.7 mAHg(-1)，循环效率达97.97%。这种显著的性能可以归因于基于F掺杂PMIA膜基质的凝胶聚合物电解质对多硫化物的物理捕获和工作电池中的树状结构对多硫化物的抑制。(C)2017爱思唯尔B.V.保留所有权利。
In this study, F-doped tree-like nanofiber structural poly-m-phenyleneisophthalamide (PMIA) membranes are prepared via one-step electrospinning approach and their application performance as separators for lithium-sulfur batteries are discussed. The F-doped PMIA membrane can be regarded as matrix to form gel polymer electrolyte. The F doping endows the PMIA membranes with extraordinary high electrolyte uptake, excellent ability of preserving the liquid electrolyte and forceful chemisorption to polysulfides. And the tree-like structure effectively blocks polysulfides by the physical confinement. The lithium-sulfur cell with the F-doped PMIA separator exhibits high first-cycle discharge capacity of 1222.5 mAh g(-1) and excellent cycling stability with good capacity retention of 745.7 mAh g(-1), and coulombic efficiency of 97.97% after 800 cycles. The remarkable performance can be ascribed to the suppressed shuttle effects through both the physical trapping of polysulfides by the gel polymer electrolyte based on matrix with F-doped PMIA membrane and the tree-like structure in a working cell. (C) 2017 Elsevier B.V. All rights reserved.