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

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 hightemperature 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 degrees C, which is 1.5 times the capacity at 25 degrees 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 (similar to 80 mAh g-1) at 60 degrees C than at 25 degrees 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. (c) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This study investigates the performance of potassium-ion batteries under high-temperature conditions using sulfur-doped biomass carbon, showing that sulfur can enhance the specific capacity of the material at high temperatures but also cause electrolyte decomposition issues. Overall, the research sheds light on the potential of high-temperature PIBs but highlights the challenges of maintaining stability under such conditions.