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Additive-free thick graphene film as an anode material for flexible lithium-ion batteries.

Authors
  • 1
  • 1 School of Electrical and Electronic Engineering, Yonsei University, Seoul, 120-749, Korea. [email protected] , (North Korea)
Type
Published Article
Journal
Nanoscale
2040-3372
Publisher
The Royal Society of Chemistry
Publication Date
Volume
7
Issue
16
Pages
7065–7071
Identifiers
DOI: 10.1039/c4nr06082b
PMID: 25587843
Source
Medline
License
Unknown

Abstract

This work demonstrates a simple route to develop mechanically flexible electrodes for Li-ion batteries (LIBs) that are usable as lightweight effective conducting networks for both cathodes and anodes. Removing electrochemically dead elements, such as binders, conducting agents and metallic current collectors, from the battery components will allow remarkable progress in this area. To investigate the feasibility of using thick, additive-free graphene films as anodes for flexible LIBs, we have synthesized and tested thick, additive-free, freestanding graphene films as anodes, first in a coin cell and further in a flexible full cell. As an anode material in a half cell, it showed a discharge capacity of about 350 mA h g(-1) and maintained nearly this capacity over 50 cycles at various current rates. This film was also tested as an anode material in a full cell with a LiCoO2 cathode and showed good electrochemical performance. Because the graphene-based flexible film showed good performance in half- and full coin cells, we used this film as a flexible anode for flexible LIBs. No conducting agent or binder was used in the anode side, which helped in realizing the flexible LIBs. Using this, we demonstrate a thin, lightweight and flexible lithium ion battery with good electrochemical performance in both its flat and bent states.

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