Revealing the closed pore formation of waste wood-derived hard carbon for advanced sodium-ion battery

By Zheng Tang, Rui Zhang, Hong Wang, Siyu Zhou, Zhiyi Pan, Yuancheng Huang, Dan Sun, You-gen Tang, Xiaobo Ji, Khalil Amine and 1 more. Nature Communications, 2023

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Although the closed pore structure plays a key role in contributing low-voltage plateau capacity of hard carbon anode for sodium-ion batteries, the formation mechanism of closed pores is still under debate. Here, we employ waste wood-derived hard carbon as a template to systematically establish the formation mechanisms of closed pores and their effect on sodium storage performance. We find that the high crystallinity cellulose in nature wood decomposes to long-range carbon layers as the wall of closed pore, and the amorphous component can hinder the graphitization of carbon layer and induce the crispation of long-range carbon layers. The optimized sample demonstrates a high reversible capacity of 430 mAh g−1 at 20 mA g−1 (plateau capacity of 293 mAh g−1 for the second cycle), as well as good rate and stable cycling performances (85.4% after 400 cycles at 500 mA g−1). Deep insights into the closed pore formation will greatly forward the rational design of hard carbon anode with high capacity.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/14a231faa6e904f475b29e462a31ba376b1a84db