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Nature of Novel 2D van der Waals Heterostructures for Superior Potassium Ion Batteries
Author(s) -
Wang Jue,
Wang Bin,
Lu Bingan
Publication year - 2020
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.202000884
Subject(s) - van der waals force , materials science , heterojunction , graphene , anode , chemical engineering , electrochemistry , potassium , nanotechnology , ion , intercalation (chemistry) , inorganic chemistry , electrode , optoelectronics , molecule , chemistry , organic chemistry , metallurgy , engineering
Novel 2D van der Waals heterostructures with innovative bimetallic oxychloride (Bi‐ and Sb‐based oxychloride) nanosheets that are well dispersed on reduced graphene oxide nanosheets, are established through element engineering for superior potassium ion battery (PIBs) anodes. This material displays an exceptional electrochemical performance, obtaining a discharge capacity as high as 360 mAh g −1 at 100 mA g −1 after running 1000 cycles for over 9 months with a capacity preservation percentage of 88.5% and achieving a discharge capacity as high as 319 mAh g −1 at 1000 mA g −1 , in addition to the low charge/discharge plateaus for anodes and promising full cell performance. More significantly, the nature of such 2D van der Waals heterostructures, including the element engineering for morphology control, the function of each component of heterostructures, the mechanism of potassium ion storage, and the process of K + intercalation accompanied with the lattice distortion and chemical bond breakages, is explored in depth. This study is critical for not only paving the way for the practical application of PIBs but also shedding light on fundamentals of potassium ion storage in 2D van der Waals heterostructures.