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Chemical Activated Hollow Carbon Nanospheres as a High-Performance Anode Material for Potassium Ion Batteries

Abstract

Potassium-ion batteries (KIBs) are considered as a promising competitor of other metal-ion battery systems for low-cost and large-scale energy storage, but their development is hindered by poor intercalation property of K ions in electrodes due to the heavier weight and larger size of K ion than Li ion. Therefore, achieving an ultra-long cycle life with high capacity and excellent rate capability remains a significant challenge for KIB electrodes. Herein, activated hollow carbon nanospheres (AHCSs) with enlarged interlayer spacing, oxygen-containing functional groups (OCFGs) on surface and high specific surface area are proposed as a new anode electrode for high-performance KIBs. Ex-situ XRD and TEM demonstrate that the enlarged interlayer spacing allow more reversible K ions intercalation into the carbon layer and readily accommodate large (de)potassiation strain without fracture, while OCFGs on AHCSs enhance pseudocapacitance type behavior and specific capacity. As a synergistic effect of these structural features, the AHCSs served as anode for KIBs exhibit impressive electrochemical properties with high initial charge capacity of 370.2 mAh g-1 at 0.2 A g-1, ultra-long cycling life for 5000 cycles at a high current density of 2.0 A g-1, as well as prominent rate capability of 137.0 mAh g-1 at 4.0 A g-1. This work highlights the significant role of interlayer spacing, surface oxygen functionalization and hierarchical porosity of carbon-based anodes in potassium storage.

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Publication details

The article was received on 10 Oct 2018, accepted on 06 Nov 2018 and first published on 06 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA09751H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Chemical Activated Hollow Carbon Nanospheres as a High-Performance Anode Material for Potassium Ion Batteries

    G. wang, X. Xiong, D. Xie, Z. Lin, J. Zheng, Z. Fenghua, Y. Li, Y. Liu, C. Yang and M. Liu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA09751H

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