木质素
阳极
电化学
电池(电)
材料科学
钠
微晶
碳化
化学工程
锂(药物)
微晶纤维素
酚醛树脂
化学
纤维素
甲醛
冶金
复合材料
有机化学
电极
工程类
功率(物理)
物理化学
内分泌学
物理
医学
量子力学
扫描电子显微镜
结晶学
作者
Yang Zhang,Youyu Zhu,Jizong Zhang,Shuai Sun,Chengyang Wang,Mingming Chen,Jingxuan Zeng
标识
DOI:10.1002/ente.201900694
摘要
Sodium‐ion batteries are expected to be an alternative to lithium‐ion batteries because of the inexpensive raw materials. However, the anode materials still face problems of low capacity and initial coulomb efficiency, even for hard carbons that are expected to have commercial applications. Herein, a resin nanosphere derived from lignin through double solvent evaporation and resinification is reported. Benefiting from the phenol–formaldehyde condensation to form linear polymers, the samples possess a large microcrystalline size, moderate interlayer distance, and defect sites in the turbostratic structure, which enhance the sodium‐storage capacity. The carbonized lignin‐based resin spheres (CLRSs) exhibit promising electrochemical performance with a comparable reversible capacity of 347 mAh g −1 and high initial columbic efficiency (ICE) of 74%. Furthermore, the sodium‐storage mechanism for the obtained samples is also investigated by analyzing the relationship between the structure optimization and electrochemical performance.
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