Acta Phys. -Chim. Sin. ›› 2026, Vol. 42 ›› Issue (5): 100199.doi: 10.1016/j.actphy.2025.100199

• ARTICLE • Previous Articles     Next Articles

Corn-distillers-derived hard carbon: a sustainable high-rate, long-life anode for sodium-ion batteries

Xue Zhang1, Zihan He1, Yingqi Wu1, Weilai Yu2,*(), Tao Liu1,*()   

  1. 1 Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, Hubei Proivince, China
    2 Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto ON, M5S3E5, Canada
  • Received:2025-08-29 Revised:2025-09-28 Accepted:2025-09-29 Published:2026-01-23
  • Contact: Email: weilai.yu@utoronto.ca (Weilai Yu)liutao54@cug.edu.cn (Tao Liu)

Abstract:

Hard carbon (HC) derived from corn-distillers is a sustainable, affordable anode candidate for sodium-ion batteries (SIBs), yet its practical deployment has been limited by insufficient reversible capacity. Here we report a temperature-gradient treatment that precisely tailors interlayer spacing, porosity, and graphitization in corn-distillers-derived hard carbon, unlocking exceptional electrochemical performance. The optimized material exhibits an interlayer spacing of 0.378 nm and a dominant pore size of 1.68 nm. It demonstrates outstanding high-rate behavior, achieving 289 and 198 mAh g-1 at 1.0 and 2.0 A g-1, respectively. Additionally, it retains 83% of its capacity after 700 cycles at 2.0 A g-1. Integrating in situ X-ray diffraction with ex situ Raman spectroscopy demonstrates a unique sodium-storage mechanism characterized by both "adsorption–intercalation and pore-filling". This approach helps elucidate the rapid kinetics and long-lasting performance. These results demonstrate that controlled structural tactics of biomass-derived HC can achieve the desired capacity, rate capability, and longevity required for practical SIB anodes—bringing an abundant, waste-derived feedstock dramatically closer to commercialization.

Key words: Corn distillers, Hard carbon, Ex situ Raman, In situ XRD, Rate performance