材料科学
微观结构
阳极
电池(电)
钠离子电池
碳纤维
钠
冶金
作文(语言)
纳米技术
复合材料
化学工程
电极
复合数
功率(物理)
化学
物理
语言学
哲学
物理化学
量子力学
法拉第效率
工程类
作者
Wei Wu,Aoxuan Wang,Dehua Xu,Chengde Huang,Xingjiang Liu,Zhenglin Hu,Jiayan Luo
出处
期刊:Nano Energy
[Elsevier]
日期:2024-09-01
卷期号:128: 109880-109880
标识
DOI:10.1016/j.nanoen.2024.109880
摘要
Sodium-ion batteries (SIBs) have advantages in high sodium resources, providing powerful supplement to the current energy storage system. However, the lack of low-cost and high-performance anode materials still limits its practical application. Herein, a soft carbon anode derived from petroleum coke was successfully synthesized by engineering its composition and microstructure through resin and sodium phosphate compositing with optimal heat treatment process, delivering significant merits over existing composite anode in term of price density, initial Coulombic efficiency (ICE) and carbon yield. Resin helps to increase micropores and inhibit graphitization. Na3PO4 contributes to expand layer spacing and increase reversible groups, meanwhile facilitates the cross-linking of graphite microcrystalline and provides additional sodium supplement with improved ICE and conductivity. Through the synergistic effect by the additives, the optimized sample (P-ONH-1200) exhibits a superior reversible charge specific capacity of 311.9 mAh g−1 with high cycling stability, ICE (90.7 %) in SIBs, and high carbon yield (70 %). It also gains rate performance of 209.7 mAh g−1 at 4 C with 98 % retention after 1000 cycles. The full cell with Na3V2(PO4)3 (NVP) cathode at 1.05 N/P ratio exhibits an excellent stability with a capacity retention of 70 % after 500 cycles at 1 C. It provides a model reference for the microstructure regulation of petroleum coke and a revenue for preparation high-performance soft carbon anode for SIBs.
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