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Effect of Sulfur Modification on Structural and Electrochemical Performance of Pitch-Based Carbon Materials for
Zihui Ma1, Zhe Wen1,2, Yan Song1,3
1CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
Abstract:
Coal tar pitch (CTP) has become an ideal choice in the preparation of anode precursors for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) because of its abundant carbon content, competitive pricing and adjustable structure properties. In this paper, sulfurized pitch-based carbon (SPC-800) was obtained by allowing CTP to react with sulfur at 350 °C and subsequently achieve carbonization at 800 °C. SPC-800 was more disordered and had a larger layer spacing than carbonized CTP (PC-800). Upon utilization as an anode for LIBs, SPC-800 possessed a higher reversible specific capacity (478.1 mAh g-1 at 0.1 A g-1), while utilization in SIBs displayed a capacity of 220.9 mAh g-1 at 20 mA g-1. This work is an important guide to the design of high-performance anodes suitable for use with both LIBs and SIBs.
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