Replacing “Alkyl” with “Aryl” for inducing accessible channels to closed pores as plateau‐dominated sodium‐ion battery anode
Wenlong Shao,
Qi Cao,
Siyang Liu,
Tianpeng Zhang,
Zihui Song,
Ce Song,
Zhihuan Weng,
Xigao Jian,
Fangyuan Hu
Affiliations
Wenlong Shao
State Key Laboratory of Fine Chemicals Department of Polymer Materials & Engineering Liaoning Province Engineering Research Centre of High Performance Resins Dalian University of Technology Dalian P. R. China
Qi Cao
State Key Laboratory of Fine Chemicals Department of Polymer Materials & Engineering Liaoning Province Engineering Research Centre of High Performance Resins Dalian University of Technology Dalian P. R. China
Siyang Liu
School of Materials Science and Engineering Key Laboratory of Energy Materials and Devices (Liaoning Province) State Key Laboratory of Fine Chemicals Liaoning Province Engineering Centre of High Performance Resins Dalian University of Technology Dalian P. R. China
Tianpeng Zhang
School of Materials Science and Engineering Key Laboratory of Energy Materials and Devices (Liaoning Province) State Key Laboratory of Fine Chemicals Liaoning Province Engineering Centre of High Performance Resins Dalian University of Technology Dalian P. R. China
Zihui Song
School of Materials Science and Engineering Key Laboratory of Energy Materials and Devices (Liaoning Province) State Key Laboratory of Fine Chemicals Liaoning Province Engineering Centre of High Performance Resins Dalian University of Technology Dalian P. R. China
Ce Song
School of Materials Science and Engineering Key Laboratory of Energy Materials and Devices (Liaoning Province) State Key Laboratory of Fine Chemicals Liaoning Province Engineering Centre of High Performance Resins Dalian University of Technology Dalian P. R. China
Zhihuan Weng
State Key Laboratory of Fine Chemicals Department of Polymer Materials & Engineering Liaoning Province Engineering Research Centre of High Performance Resins Dalian University of Technology Dalian P. R. China
Xigao Jian
State Key Laboratory of Fine Chemicals Department of Polymer Materials & Engineering Liaoning Province Engineering Research Centre of High Performance Resins Dalian University of Technology Dalian P. R. China
Fangyuan Hu
School of Materials Science and Engineering Key Laboratory of Energy Materials and Devices (Liaoning Province) State Key Laboratory of Fine Chemicals Liaoning Province Engineering Centre of High Performance Resins Dalian University of Technology Dalian P. R. China
Abstract Hard carbons are promising anodes for sodium‐ion batteries. However, there is still considerable controversy regarding the sodium storage behaviors in hard carbons, which are mainly attributed to the varied precursors, confused pyrolysis mechanism, and different characterization methods. Herein, benefiting from the flexible molecular structure of polymers, a series of hard carbons with carefully tuned microstructures are fabricated by adjusting the ratio of aryl and alkyl groups in the epoxy resins. The results of dynamic mechanical analysis, in‐situ Fourier transform infrared spectra, and synchronous thermal gravimetric‐infrared spectrum‐gas chromatography/mass spectrometry reveal that replacing the alkyl with aryl groups in the resin can enhance the crosslink density, inhibit the degradation and rearrangement process, and further lead to a more disordered microstructure. In addition, it is suggested that accessible channels provided by sufficiently wide interlayer spacing are necessary for closed pore filling. The optimized anode delivers a high capacity of 375 mAh/g in half cell with an initial Coulombic efficiency of 80.61%, and an energy density of 252 Wh/kg is attained in full cell. Finally, a reliable relationship among precursor–pyrolysis mechanism–structure–performance is established, and the sodium storage mechanism of “adsorption–insertion–pore filling” is well proved.
