Sulfur-deficient MoS2 grown inside hollow mesoporous carbon as a functional polysulfide mediator

Wang, Hong-En1; Li, Xuecheng1; Qin, Ning3; Zhao, Xu4; Cheng, Hua3; Cao, Guozhong5; Zhang, Wenjun2

2019-05-21

10.1039/c9ta01722d

Journal of Materials Chemistry A   影响因子和分区

2050-7488

2050-7496

Lithium-sulfur (Li-S) batteries are regarded as one of the most promising next-generation electrochemical cells. However, shuttling of lithium polysulfide intermediates and sluggish kinetics in random deposition of lithium sulfide (Li2S) have significantly degraded their capacity, rate and cycling performance. Herein, few-layered MoS2 nanosheets enriched with sulfur vacancies are anchored inside hollow mesoporous carbon (MoS2-x/HMC) via S-C bonding and proposed as a novel functional mediator for Li-S batteries. Ultrathin MoS2 sheets with abundant sulfur vacancies have strong chemical affinity to polysulfides and in the meantime catalyze their fast redox conversion with enhanced reaction kinetics as proved by experimental observations and first-principles density functional theory (DFT) calculations. At a current density of 1C, the MoS2-x/HMC-S composite cathode exhibits a high initial capacity of 945 mA h g(-1) with a high retained capacity of 526 mA h g(-1) and a coulombic efficiency of nearly 100% after 500 cycles. The present work sheds light on the design of novel functional electrodes for next-generation electrochemical cells based on a simple yet effective vacancy engineering strategy.

SCI ; EI

英语

其他

National Science Foundation[1803256]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000472465300043

ROYAL SOC CHEMISTRY

20192206987283

Calculations ; Cathodes ; Cell engineering ; Chemical bonds ; Density functional theory ; Design for testability ; Electrochemical cells ; Layered semiconductors ; Lithium batteries ; Lithium sulfur batteries ; Molybdenum compounds ; Polysulfides ; Reaction kinetics ; Sulfur compounds

Biomedical Engineering:461.1 ; Electric Batteries:702.1 ; Primary Batteries:702.1.1 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Organic Polymers:815.1.1 ; Mathematics:921 ; Probability Theory:922.1

Web of Science

1.Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
2.City Univ Hong Kong, Ctr Super Diamond & Adv Films COSDAF, Dept Mat Sci & Engn, Hong Kong, Peoples R China
3.Southern Univ Sci & Technol, Dept Mat Sci & Technol, Shenzhen 518055, Peoples R China
4.China Acad Engn Phys, Inst Chem Mat, Mianyang 621900, Sichuan, Peoples R China
5.Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA

Wang, Hong-En,Li, Xuecheng,Qin, Ning,et al. Sulfur-deficient MoS2 grown inside hollow mesoporous carbon as a functional polysulfide mediator[J]. Journal of Materials Chemistry A,2019,7(19):12068-12074.

Wang, Hong-En.,Li, Xuecheng.,Qin, Ning.,Zhao, Xu.,Cheng, Hua.,...&Zhang, Wenjun.(2019).Sulfur-deficient MoS2 grown inside hollow mesoporous carbon as a functional polysulfide mediator.Journal of Materials Chemistry A,7(19),12068-12074.

Wang, Hong-En,et al."Sulfur-deficient MoS2 grown inside hollow mesoporous carbon as a functional polysulfide mediator".Journal of Materials Chemistry A 7.19(2019):12068-12074.