Citation: Zeren Zhou, Yixiang Zhang, Qixian Zhang, Qiaoyan Lin, Yong Shuai, Zhijiang Wang, Lishuang Fan. Orbital hybridization states of carbon assisted robust inorganic-rich solid electrolyte interphase towards high initial coulombic efficiency hard carbon anode[J]. Chinese Chemical Letters, ;2026, 37(2): 111506. doi: 10.1016/j.cclet.2025.111506 shu

Orbital hybridization states of carbon assisted robust inorganic-rich solid electrolyte interphase towards high initial coulombic efficiency hard carbon anode

Zeren Zhou ^a ,
Yixiang Zhang ^a ,
Qixian Zhang ^{b, *,} ,
Qiaoyan Lin ^a ,
Yong Shuai ^c ,
Zhijiang Wang ^a ,
Lishuang Fan ^{a, *,}

a.
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
b.
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
c.
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

zqxciac@163.com

fanlsh@hit.edu.cn

Received Date: 6 May 2025
Revised Date: 18 June 2025
Accepted Date: 25 June 2025
Available Online: 25 June 2025

Figures(4)

Hard carbon is a vital anode material for sodium-ion batteries; however, the nonuniform growth of solid electrolyte interphase (SEI) film substantially diminishes its initial coulombic efficiency (ICE) and cycle life. The chemical and morphological properties of surface highly influence the electrode/electrolyte interfacial reactions. In this study, we have tuned orbital hybridization states forming an interface enriched with sp² hybridized carbon (sp²–C), which decreases the binding energy to solvent molecules and inhibits excessive solvent decomposition during SEI formation. Benefiting from successfully constructed inorganic-rich SEI, the ICE increased to 91% and sodium storage capacity reached 346 mAh/g. Besides, the capacity retention rate was 90.7% after 700 cycles at 1 A/g higher than pristine electrode (83.8%).
- Sodium-ion battery,
- Hard carbon,
- Orbital hybridization,
- Solid electrolyte interphase,
- Initial Coulombic efficiency
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