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Predicting Capacity of Hard Carbon Anodes in Sodium-Ion Batteries Using Porosity Measurements

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  • We report an inverse relationship between measurable porosity values and reversible capacity from sucrose-derived hard carbon as an anode for sodium-ion batteries (SIBs). Materials with low measureable pore volumes and surface areas obtained through N₂ sorption yield higher reversible capacities. Conversely, increasing measurable porosity and specific surface area leads to sharp decreases in reversible capacity. Utilizing a low porosity material, we thus are able to obtain a reversible capacity of 335 mAh g⁻¹. These findings suggest that sodium-ion storage is highly dependent on the absence of pores detectable through N₂ sorption in sucrose-derived carbon.
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  • Bommier, C., Luo, W., Gao, W. Y., Greaney, A., Ma, S., & Ji, X. (2014). Predicting capacity of hard carbon anodes in sodium-ion batteries using porosity measurements. Carbon, 76, 165-174. doi:10.1016/j.carbon.2014.04.064
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  • 76
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  • X. J. gratefully acknowledges the financial support from Advanced Research Projects Agency-Energy (ARPA-E), Department of Energy of the United States, Award Number: DE-AR0000297TDD. The authors would like to thank Dr. Peter Eschbach and Ms. Teresa Sawyer for the SEM measurements in OSU EM Facility funded by National Science Foundation, the Murdock Charitable Trust and the Oregon Nanoscience and Microtechnology Institute.
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