Electrochemically Induced High Capacity Displacement Reaction of PEO/MoS2/Graphene Nanocomposites with Lithium

Journal Article · Tue Aug 09 04:00:00 EDT 2011 · Advanced Functional Materials, 21(15):2840-2846

DOI:https://doi.org/10.1002/adfm.201002752· OSTI ID:1025673

Xiao, Jie; Wang, Xaojian; Yang, Xiao-Qing; Xun, Shidi; Liu, Gao; Koech, Phillip K; Liu, Jun; Lemmon, John P

MoS2/PEO/graphene composite is successfully prepared and the discharge mechanism of MoS2 as an anode material for Li-ion batteries has been investigated systematically in this work. The simultaneous formation of Li2S and Mo at deep discharge depth has been shown for the first time. The deposition of Mo metal with Li residing on the defects after the first discharge increases the intrinsic electronic conductivity of the electrode leading to a superior cycling stability for over 185 cycles. After the first discharge the amorphous Mo matrix allows a large amount of Li+ ions to repeatedly deposit and being oxidized during cycling while the transition between Li2S and S contribute to the capacity above 2.0 V. The interactions between as-formed Mo and S prevents the dissolution of the intermediate polysulfide thus providing clues to immobilize the soluble species in a Li-S battery. Excellent rate performances are achieved in this MoS2/PEO/graphene composite indicating a fast diffusion path of Li+ ions existing not only in the bulk material but also in the interface between the electrode and the electrolyte.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1025673
• Report Number(s): PNNL-SA-76336
• Journal Information: Advanced Functional Materials, 21(15):2840-2846, Journal Name: Advanced Functional Materials, 21(15):2840-2846 Journal Issue: 15 Vol. 21; ISSN 1616-301X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANODES
CAPACITY
DEFECTS
DEPOSITION
DIFFUSION
DISSOLUTION
ELECTRODES
LITHIUM
MoS2
Exfoliation
graphene
Lithium ion batteries
energy storage
STABILITY
SULFIDES