Abstract
Potassium ion batteries (PIBs), an alternative to traditional lithium ion batteries to large-scale energy storage device, have attracted tremendous attention, due to abundant reserves of potassium resources and low cost. However, it still remains challenge to fabricate suitable anode materials with high K storage capabilities. In this work, facile S/N co-doped pitch based composite carbon nanofibers has been fabricated by electrospinning of coal tar pitch and polyacrylonitrile, and followed by carbonization under H2S/Ar atmosphere. The formation of -C-S-Cbond effectively increased S utilization, and enlarged carbon interlayer distance to some degree. As anode for PIBs, the S/N co-doped carbon displayed enhancement of capacity, rate capability and cycle stability. This work would shed a light on the fabrication of S/N co-doped materials for both battery, supercapacitor and electrocatalytic electrodes.
Highlights
Lithium ion batteries (LIBs) have been widely used in portable electronic equipment and electric vehicles
The large-scale utilization of lithium ion battery will inevitably push up the price of lithium resources, and the high production cost of lithium ion battery makes it unable to meet the requirements of large-scale energy storage devices in the future [1, 2]
General anode material used in LIBs, can form stage-one intercalation compounds of KC8, the narrowed interlayer distance leading to a relatively low theoretical capacity of only 279 mAh g-1
Summary
Lithium ion batteries (LIBs) have been widely used in portable electronic equipment and electric vehicles. General anode material used in LIBs, can form stage-one intercalation compounds of KC8, the narrowed interlayer distance leading to a relatively low theoretical capacity of only 279 mAh g-1. Though Non-carbon materials generally present high capacity, the violent volume expansion inevitably causes poor cycle stability.
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