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In-situ carbon encapsulation of vertical MoS2 arrays with SnO2 for durable high rate lithium storage: dominated pseudocapacitive

Abstract

Boosted conductivity and charge-transfer kinetics are favorable to the innovation of sustainable energy devices to metal oxide/sulfide-based electrodes. Herein, with intercalation pseudocapacitance effect, an in-situ polymerization-carbonization process for novel carbon sealed vertical MoS$_{2}$-SnO$_{2}$ anchoring on graphene aerogel (C@MoS$_{2}$-SnO$_{2}$@Gr) has manifested the excellent rate performance and durability anode of lithium ion batteries. The integrated carbon layer and graphene matrix provide a bicontinuous conductive network for efficient electron/ion diffusion pathways. The charge transfer kinetics could be enhanced by the synergistic effects between vertical MoS$_{2}$ nanosheets and well-dispersed SnO$_{2}$ particles. Based on the crystal surface matching, the ameliorated electric contact between MoS$_{2}$ and SnO$_{2}$ can promote the extraction of Li$^{+}$ from Li$_{2}$O and restrained the serious aggregation of Li$_{x}$Sn. As a result, the improved reversibility enables a higher initial Coulombic efficiency (ICE) of 80\% (0.1 A g$^{-1}$ current density) among others. Specially, with the dominated surface capacitive process, C@MoS$_{2}$-SnO$_{2}$@Gr electrode delivers a stable capacity of 680 mA h g$^{-1}$ at 2.5 A g$^{-1}$ for 2000 cycles. Quantitative insight into the origin of its boosted kinetics demonstrated the high pseudocapacitance contribution (above 90\%), which endows the durable high rate li-ion storage.

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Publication details

The article was received on 03 Oct 2017, accepted on 27 Nov 2017 and first published on 28 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR07359C
Citation: Nanoscale, 2017, Accepted Manuscript
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    In-situ carbon encapsulation of vertical MoS2 arrays with SnO2 for durable high rate lithium storage: dominated pseudocapacitive

    M. Li, Q. Deng, J. Wang, K. Jiang, Z. Hu and J. Chu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR07359C

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