Sulfur-Grafted Hollow Carbon Spheres for Potassium-Ion Battery Anodes.

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ID: 54232
2019
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Abstract
Sulfur-rich carbons are minimally explored for potassium-ion batteries (KIBs). Here, a large amount of S (38 wt%) is chemically incorporated into a carbon host, creating sulfur-grafted hollow carbon spheres (SHCS) for KIB anodes. The SHCS architecture provides a combination of nanoscale (≈40 nm) diffusion distances and CS chemical bonding to minimize cycling capacity decay and Coulombic efficiency (CE) loss. The SHCS exhibit a reversible capacity of 581 mAh g (at 0.025 A g ), which is the highest reversible capacity reported for any carbon-based KIB anode. Electrochemical analysis of S-free carbon spheres baseline demonstrates that both the carbon matrix and the sulfur species are highly electrochemically active. SHCS also show excellent rate capability, achieving 202, 160, and 110 mAh g at 1.5, 3, and 5 A g , respectively. The electrode maintains 93% of the capacity from the 5th to 1000th cycle at 3 A g , with steady-state CE being near 100%. Raman analysis indicates reversible breakage of CS and SS bonds upon potassiation to 0.01 V versus K/K . The galvanostatic intermittent titration technique (GITT) analysis provides voltage-dependent K diffusion coefficients that range from 10 to 10 cm s upon potassiation and depotassiation, with approximately five times higher coefficient for the former.
Reference Key
ding2019sulfurgraftedadvanced Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ding, Jia;Zhang, Hanlei;Zhou, Hui;Feng, Jun;Zheng, Xuerong;Zhong, Cheng;Paek, Eunsu;Hu, Wenbin;Mitlin, David;
Journal advanced materials (deerfield beach, fla)
Year 2019
DOI
10.1002/adma.201900429
URL
Keywords
potassium-ion batteries kibs carbon anodes sulfur-doped carbons

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