Impact of pitch fraction oxidation on the structure and sodium storage properties of derived carbon materials
Source abstract
Abstract
Pitch produced by the liquefaction of coal was divided into two fractions: soluble in toluene (TS) and insoluble in toluene but soluble in pyridine (TI-PS), and their differences in molecular structure and oxidation activity were studied. Several different carbon materials were produced from them by oxidation in air (350 °C, 300 mL/min) followed by carbonization (1000 °C in Ar), and the effect of the cross-linked structure on their structure and sodium storage properties was investigated. The results showed that the two pitch fractions were obviously different after the air oxidation. The TS fraction with a low degree of condensation and abundant side chains had a stronger oxidation activity and thus introduced more cross-linked oxygen-containing functional groups C(O)―O which prevented carbon layer rearrangement during the carbonization. As a result, a disordered hard carbon with more defects was formed, which improved the electrochemical performance. Therefore, the carbon materials derived from TS (O-TS-1000) had an obvious disordered structure and a larger layer spacing, giving them better sodium storage performance than those derived from the TI-PS fraction (O-TI-PS-1000). The specific capacity of O-TS-1000 was about 250 mAh/g at 20 mA/g, which was 1.67 times higher than that of O-TI-PS-1000 (150 mAh/g). Download: Download high-res image (107KB) Download: Download full-size image
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Research context
OpenAlex topics: Advancements in Battery Materials · Extraction and Separation Processes · Advanced ceramic materials synthesis
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