N-doped pinecone-based carbon with a hierarchical porous pie-like structure: a long-cycle-life anode material for potassium-ion batteries. Issue 31 (13th July 2022)

• Record Type: Journal Article
• Authors: Lu, Jian-Fang; Li, Ke-Chun; Lv, Xiao-Yan; Lei, Fu-Hou; Mi, Yan; Wen, Yan-Xuan
• Is Part Of: RSC advances. Volume 12:Issue 31(2022)
• Page Start: 20305
• Page End: 20318
• Publication Date: 2022-07-13
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra03205h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Pinecone-based biomass carbon (PC) is a potential anode material for potassium-ion batteries because it is abundant, cheap, renewable, and easy to obtain. Abstract : Pinecone-based biomass carbon (PC) is a potential anode material for potassium-ion batteries because it is abundant, cheap, renewable, and easy to obtain. However, because of inferior kinetics and the effects of volume expansion due to the large radius of the K + ion, it does not meet commercial performance requirements. In this study, nitrogen-doped PC (NPC) was prepared by carbonization in molten ZnCl2 with urea as a nitrogen source. A strategy based on synergistic effects between N doping and ZnCl2 molten salt was used to produce a hierarchically porous pie-like NPC with abundant defects and active sites and an enlarged interlayer distance—properties that enhance K + adsorption, promote K + intercalation/diffusion, and reduce the effects of volume expansion. This NPC exhibited a high reversible capacity (283 mA h g −1 at 50 mA g −1 ) and superior rate performance and cyclic stability (110 mA h g −1 after 1000 cycles at 5 A g −1 ), demonstrating its potential for use in potassium-ion batteries.