Hard–Soft Carbon Composite Anodes with Synergistic Sodium Storage Performance
By Fei Xie, Zhen Xu, A. S. Jensen, Heather Au, Yaxiang Lu, V. Araullo-Peters, A. Drew, Yong‐Sheng Hu, M. Titirici. Advanced Functional Materials, 2019
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A series of hard–soft carbon composite materials is produced from biomass and oil waste and applied as low‐cost anodes for sodium‐ion batteries to study the fundamentals behind the dependence of Na storage on their structural features. A good reversible capacity of 282 mAh g−1 is obtained at a current density of 30 mA g−1 with a high initial Coulombic efficiency of 80% at a carbonization temperature of only 1000 °C by adjusting the ratio of hard to soft carbon. The performance is superior to the pure hard or soft carbon anodes produced at the same temperatures. This synergy between hard and soft carbon resulting in an excellent performance is due to the blockage of some open pores in hard carbon by the soft carbon, which suppresses the solid electrolyte interface formation and increases the reversible sodium storage capacity.
Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/732904ea67d34492b1189ac0285d19d68d4a1f9a
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Citations in the corpus
- Hard carbons for sodium-ion batteries and beyond (2020, methodology): “As electrode materials, although hard carbons do not have as high a specific capacity as chalcogen-based materials and alloys, their capacity can approach the commercial graphite anodes of LIBs, and their lower working voltage can be a good point for improving the energy density [9].”