Revealing the anion intercalation behavior and surface evolution of graphite in dual-ion batteries via in situ AFM
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Graphite as a positive electrode material of dual ion batteries (DIBs) has attracted tremendous attentions for its advantages including low lost, high working voltage and high energy density. However, very few literatures regarding to the real-time observation of anion intercalation behavior and surface evolution of graphite in DIBs have been reported. Herein, we use in situ atomic force microscope (AFM) to directly observe the intercalation/de-intercalation processes of PF6− in graphite in real time. First, by measuring the change in the distance between graphene layers during intercalation, we found that PF6− intercalates in one of every three graphite layers and the intercalation speed is measured to be 2 µm·min−1. Second, graphite will wrinkle and suffer structural damages at high voltages, along with severe electrolyte decomposition on the surface. These findings provide useful information for further optimizing the capacity and the stability of graphite anode in DIBs.
Date Issued
2020-01-13
Date Acceptance
2019-12-22
Citation
Nano Research, 2020, 13, pp.412-418
ISSN
1998-0124
Publisher
Springer Science and Business Media LLC
Start Page
412
End Page
418
Journal / Book Title
Nano Research
Volume
13
Copyright Statement
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Identifier
https://link.springer.com/article/10.1007%2Fs12274-020-2623-1
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
dual ion battery
in situ atomic force microscope (AFM)
graphite positive electrode
hierarchical anion intercalation
structure evolution
surface reaction
ORIENTED PYROLYTIC-GRAPHITE
ATOMIC-FORCE MICROSCOPY
X-RAY-DIFFRACTION
ELECTROCHEMICAL INTERCALATION
HIGH-VOLTAGE
ELECTROLYTE
PF6
OXIDATION
Nanoscience & Nanotechnology
Publication Status
Published
Date Publish Online
2020-01-13