2026-10-13T06:04:21Z https://www.scidb.cn/oai

10.57760/sciencedb.32249 2026-04-14T10:50:54Z

2026-04-14 Structural Regulation and Potassium Storage Performance of B, N Co-doped Hard Carbon Derived from Toluene-Insoluble Fractions of Coal Tar Pitch doi:10.57760/sciencedb.32249 en Toluene-insoluble (TI) fraction from coal tar pitch is a heavy polycyclic aromatic hydrocarbon component with high carbon content and carbonization yield, which makes it a promising precursor for carbon-based anode materials. In this work, high-temperature coal tar pitch was modified with pyridine borane as a boron–nitrogen co-dopant, and the modified TI precursor was obtained by toluene extraction, followed by carbonization at 800 °C to prepare a series of B, N-codoped TI-derived hard carbons. The effects of pyridine borane content on the chemical structure and pyrolysis behavior of TI precursors were systematically investigated, and the microstructure, pore characteristics, heteroatom speciation and potassium storage performance of the as-prepared hard carbons were characterized. The sample with 1 wt.% pyridine borane showed a carbon interlayer spacing of 0.375 nm and the highest doping levels of active B–C–O, pyridinic N and pyrrolic N. It delivered a reversible capacity of 206.52 mAh g-1 at 0.05 A g-1, and maintained 100.92 mAh g-1 after 300 cycles at 1 A g-1. This study clarifies the structure–performance regulation mechanism of pyridine borane modified TI-derived hard carbons, providing experimental and theoretical support for low-cost hard carbon anodes for potassium-ion batteries. Coal tar pitch; Pyridine borane; Toluene-Insoluble Fractions; B/N co-doping; Potassium-ion battery anode 武皓阳 武世杰 宋燕 杨桃 郝俊杰 刘占军 PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank