Construction of MoO2 Quantum Dot-Graphene and MoS2 Nanoparticle-Graphene Nanoarchitectures toward Ultrahigh Lithium Storage Capability

Chundong Wang; Jianjun Jiang; Yunjun Ruan; Xiang Ao; Kostya Ostrikov; Wenjun Zhang; Jian Lu; Yang Yang Li

doi:10.1021/acsami.7b07100

Construction of MoO₂ Quantum Dot-Graphene and MoS₂ Nanoparticle-Graphene Nanoarchitectures toward Ultrahigh Lithium Storage Capability

ACS Appl Mater Interfaces. 2017 Aug 30;9(34):28441-28450. doi: 10.1021/acsami.7b07100. Epub 2017 Aug 18.

Authors

Chundong Wang¹, Jianjun Jiang¹, Yunjun Ruan¹, Xiang Ao¹, Kostya Ostrikov^{2

3}, Wenjun Zhang, Jian Lu, Yang Yang Li

Affiliations

¹ School of Optical and Electronic Information, Huazhong University of Science and Technology , Wuhan 430074, China.
² School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology , Brisbane, Queensland 4000, Australia.
³ Commonwealth Scientific and Industrial Research Organization , P.O. Box 218, Lindfield, New South Wales 2070, Australia.

PMID: 28805374
DOI: 10.1021/acsami.7b07100

Abstract

Herein, MoO₂ quantum dots (QDs; <5 nm) are synthesized through a one-step solvothermal process. MoO₂ QD-bonded graphene sheets (MoO₂-QDs@RGO) are facilely produced and can be further converted through sulfidation into MoS₂ nanoparticle-bonded graphene sheets (MoS₂-NPs@RGO). The novel MoO₂-QDs@RGO electrodes demonstrate exceptionally attractive lithium storage capability (e.g., 1257 mA h g^-1 at 100 mA g^-1, being close to the highest values ever reported for a MoO₂-based lithium ion battery electrode), rate capability, and cycle stability. Moreover, the MoS₂-NPs@RGO delivered a superior capacity (1497 mA h g^-1 at 100 mA g^-1) with outstanding rate retention and cycling stability. The superior lithium storage capabilities are ascribed to the synergetic effects of the high-surface-area graphene sheets, the well-dispersed MoS₂ nanoparticles, and their strong bonding with each other, which effectively prevents aggregation of MoS₂ while the composite architecture allows fast transport of electrons and ions.

Keywords: MoO2 quantum dots; MoS2 nanoparticles; graphene; lithium ion batteries; monoclinic.