Preferential Pyrolysis Construction of Carbon Anodes with 8400 h Lifespan for High-Energy-Density K-ion Batteries.

Abstract
Carbonaceous materials are promising anodes for practical potassium-ion batteries, but fail to meet the requirements for durability and high capacities at low potentials. Herein, we constructed a durable carbon anode for high-energy-density K-ion full cells by a preferential pyrolysis strategy. Utilizing S and N volatilization from a π-π stacked supermolecule, the preferential pyrolysis process introduces low-potential active sites of sp2 hybridized carbon and carbon vacancies, endowing a low-potential "vacancy-adsorption/intercalation" mechanism. The as-prepared carbon anode exhibits a high capacity of 384.2 mAh g-1 (90% capacity locates below 1 V vs. K/K+), which contributes to a high energy density of 163 Wh kg-1 of K-ion full battery. Moreover, abundant vacancies of carbon alleviate volume variation, boosting the cycling stability over 14,000 cycles (8,400 h). Our work provides a new synthesis approach for durable carbon anodes of K-ion full cells with high energy densities.

Citation
Yin, J., Jin, J., Chen, C., Lei, Y., Tian, Z., Wang, Y., Zhao, Z., Emwas, A.-H., Zhu, Y., Han, Y., Schwingenschlögl, U., Zhang, W., & Alshareef, H. N. (2023). Preferential Pyrolysis Construction of Carbon Anodes with 8400 h Lifespan for High-Energy-Density K-ion Batteries. Angewandte Chemie International Edition. Portico. https://doi.org/10.1002/anie.202301396

Acknowledgements
The research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST) ( BAS/1/1317-01-01).

Publisher
Wiley

Journal
Angewandte Chemie (International ed. in English)

DOI
10.1002/anie.202301396
10.1002/ange.202301396

PubMed ID
36856567

Additional Links
https://onlinelibrary.wiley.com/doi/10.1002/anie.202301396

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