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Directly Coating a Multifunctional Interlayer on the Cathode via Electrospinning for Advanced Lithium–Sulfur Batteries
journal contribution
posted on 2017-08-16, 00:00 authored by Yueying Peng, Yiyong Zhang, Yunhui Wang, Xiu Shen, Feng Wang, He Li, Bing-Joe Hwang, Jinbao ZhaoThe lithium–sulfur
battery is considered as a prospective candidate for a high-energy-storage
system because of its high theoretical specific capacity and energy.
However, the dissolution and shutter of polysulfides lead to low active
material utilization and fast capacity fading. Electrospinning technology
is employed to directly coat an interlayer composed of polyacrylonitrile
(PAN) and nitrogen-doped carbon black (NC) fibers on the cathode.
Benefiting from electrospinning technology, the PAN-NC fibers possess
good electrolyte infiltration for fast lithium-ion transport and great
flexibility for adhering on the cathode. The NC particles provide
good affinity for polysufides and great conductivity. Thus, the polysulfides
can be trapped on the cathode and reutilized well. As a result, the
PAN-NC-coated sulfur cathode (PAN-NC@cathode) exhibits the initial
discharge capacity of 1279 mAh g–1 and maintains
the reversible capacity of 1030 mAh g–1 with capacity
fading of 0.05% per cycle at 200 mA g–1 after 100
cycles. Adopting electrospinning to directly form fibers on the cathode
shows a promising application.