TY - JOUR
T1 - Film properties of electropolymerized polypyrrole for a sulfur/ketjenblack cathode in lithium secondary batteries
AU - Nakamura, Natsuki
AU - Wu, Yunwen
AU - Yokoshima, Tokihiko
AU - Nara, Hiroki
AU - Momma, Toshiyuki
AU - Osaka, Tetsuya
N1 - Funding Information:
This work was partly supported by the “Advanced Low Carbon Technology Research and Development Program, Specially Promoted Research for Innovative Next Generation Batteries (ALCA Spring)” from the Japan Science and Technology Agency (JST), Japan.
Funding Information:
This work was partly supported by the ?Advanced Low Carbon Technology Research and Development Program, Specially Promoted Research for Innovative Next Generation Batteries (ALCA Spring)? from the Japan Science and Technology Agency (JST), Japan.
Publisher Copyright:
© The Author(s) 2016.
PY - 2016
Y1 - 2016
N2 - A novel polypyrrole (PPy) film was investigated to determine the optimal conditions for operation in a Li/S battery. The PPy film was prepared by oxidative electropolymerization to improve the Li/S battery performance, as reported in our previous paper. In such a system, the PPy film was coated directly on the S/Ketjenblack cathode to solve the problem of polysulfide dissolution. The optimum PPy film preparation conditions to prevent polysulfide dissolution and to promote Li+ permeability were determined by varying the PPy polymerization bath composition and polymerization potential. As a result, the inclusion of 1.0 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in the polymerization bath (0.1 M pyrrole in 1-methyl-1-butylpyrrolidinium bis(trifluoromethanesulfonyl)imide) was found to be the most important factor for producing a PPy film with a high Li+ transport number (tLi+ ≈ 1). A polymerization potential of 4.5 V versus Li/Li+ was shown to be optimum for the promotion of Li+ permeability. The mechanism by which the PPy film prevents polysulfide dissolution and increases Li+ permeability is discussed by analyzing the SEM, CV, XPS, and 13C solid-state NMR data.
AB - A novel polypyrrole (PPy) film was investigated to determine the optimal conditions for operation in a Li/S battery. The PPy film was prepared by oxidative electropolymerization to improve the Li/S battery performance, as reported in our previous paper. In such a system, the PPy film was coated directly on the S/Ketjenblack cathode to solve the problem of polysulfide dissolution. The optimum PPy film preparation conditions to prevent polysulfide dissolution and to promote Li+ permeability were determined by varying the PPy polymerization bath composition and polymerization potential. As a result, the inclusion of 1.0 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in the polymerization bath (0.1 M pyrrole in 1-methyl-1-butylpyrrolidinium bis(trifluoromethanesulfonyl)imide) was found to be the most important factor for producing a PPy film with a high Li+ transport number (tLi+ ≈ 1). A polymerization potential of 4.5 V versus Li/Li+ was shown to be optimum for the promotion of Li+ permeability. The mechanism by which the PPy film prevents polysulfide dissolution and increases Li+ permeability is discussed by analyzing the SEM, CV, XPS, and 13C solid-state NMR data.
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U2 - 10.1149/2.0731605jes
DO - 10.1149/2.0731605jes
M3 - Article
AN - SCOPUS:85019465779
SN - 0013-4651
VL - 163
SP - A683-A689
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 5
ER -
