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MoS 2 /Graphene Nanosheets from Commercial Bulky MoS 2 and Graphite as Anode Materials for High Rate Sodium‐Ion Batteries
Author(s) -
Sun Dan,
Ye Delai,
Liu Ping,
Tang Yougen,
Guo Jun,
Wang Lianzhou,
Wang Haiyan
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201702383
Subject(s) - graphene , materials science , anode , graphite , heterojunction , chemical engineering , graphene oxide paper , nanotechnology , diffusion barrier , exfoliation joint , optoelectronics , composite material , electrode , layer (electronics) , chemistry , engineering
Tuning heterointerfaces between hybrid phases is a very promising strategy for designing advanced energy storage materials. Herein, a low‐cost, high‐yield, and scalable two‐step approach is reported to prepare a new type of hybrid material containing MoS 2 /graphene nanosheets prepared from ball‐milling and exfoliation of commercial bulky MoS 2 and graphite. When tested as an anode material for a sodium‐ion battery, the as‐prepared MoS 2 /graphene nanosheets exhibit remarkably high rate capability (284 mA h g −1 at 20 A g −1 (≈30C) and 201 mA h g −1 at 50 A g −1 (≈75C)) and excellent cycling stability (capacity retention of 95% after 250 cycles at 0.3 A g −1 ). Detailed experimental measurements and density functional theory calculation reveal that the functional groups in 2D MoS 2 /graphene heterostructures can be well tuned. The impressive rate capacity of the as‐prepared MoS 2 /graphene hybrids should be attributed to the heterostructures with a low degree of defects and residual oxygen containing groups in graphene, which subsequently improve the electronic conductivity of graphene and decrease the Na + diffusion barrier at the MoS 2 /graphene interfaces in comparison with the acid treated one.