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Sulfur-doped biomass carbon as anode for high temperature potassium ion full cells

Authors :
Guiling Wang
Ke Ye
Jun Yan
Kai Zhu
Zhe Gong
Dianxue Cao
Yinyi Gao
Pengfei Wang
Source :
Electrochimica Acta. 374:137920
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

Potassium-ion batteries (PIBs) have huge advantages in terms of price and resource abundance, and are ideal substitutes for lithium-ion batteries (LIBs), but there is currently little research on their high-temperature fields. In this work, the sulfur-doped biomass carbon (CHP/S) is synthesized from biomass hemp stalks as the carbon source and sulfur powder as the sulfur source, with a high sulfur content of 18.6%. Sulfur mainly exist in the form of bonded sulfur (S-C, S-O) and have quite favorable stability. As a PIBs anode, it exhibits a specific capacity of 589 mAh g−1 (30 mA g−1) at 60 °C, which is 1.5 times the capacity at 25 °C. Electrochemical analysis and kinetic analysis indicate that the increased capacity mainly comes from the “arousal effect” of sulfur under high temperature conditions, and an increased temperature has a positive effect on the absorption and desorption performance of the material. In addition, the full cell assembled with Perylene-3, 4, 9, 10-tetracarboxylic dianhydride (PTCDA) cathode shows greater capacity (~80 mAh g−1) at 60 °C than at 25 °C. Unfortunately, the electrolyte decomposition problem caused by high temperature is easily dangerous. The result is of great significance to the research of high-temperature PIBs.

Details

ISSN :
00134686
Volume :
374
Database :
OpenAIRE
Journal :
Electrochimica Acta
Accession number :
edsair.doi...........faee2773199f823f3aa8d5060d6ea198
Full Text :
https://doi.org/10.1016/j.electacta.2021.137920