TY - JOUR
T1 - Characterization of PEDOT-Quinone conducting redox polymers in water-in-salt electrolytes for safe and high-energy Li-ion batteries
AU - Oka, K.
AU - Strietzel, Christian
AU - Emanuelsson, Rikard
AU - Nishide, Hiroyuki
AU - Oyaizu, Kenichi
AU - Strømme, M.
AU - Sjödin, Martin
N1 - Funding Information:
This work was funded through SweGRIDS - by the Swedish Energy Agency , the Carl Trygger Foundation , the Swedish Research Council (VR), the Olle Engqvist Byggmästare Foundation and the Research Council Formas . K. Oka, H. Nishide, and K. Oyaizu acknowledge the financial support by Grants-in-Aids for Scientific Research ( 17H03072 , 18K19120 , 18H03921 , 18H05515 , 19J21527 ) from MEXT, Japan. The collaboration is the direct result of the Top Global University Project from MEXT, Japan. K. Oka acknowledges the Leading Graduate Program in Science and Engineering, Waseda University from MEXT, Japan and Yoshida Foundation for Science and Technology, Japan.
Publisher Copyright:
© 2019 The Authors
PY - 2019/8
Y1 - 2019/8
N2 - Li-ion batteries (LIBs) raise safety and environmental concerns, which mostly arise from their toxic and flammable electrolytes and the extraction of limited material resources by mining. Recently, water-in-salt electrolytes (WiSEs), in which a large amount of lithium salt is dissolved in water, have been proposed to allow for assembling safe and high-voltage (>3.0 V) aqueous LIBs. In addition, organic materials derived from abundant building blocks and their tunable properties could provide safe and sustainable replacements for inorganic cathode materials. In the current work, the electrochemical properties of a conducting redox polymer based on poly(3,4-ethylenedioxythiophene) (PEDOT) with hydroquinone (HQ) pendant groups have been characterized in WiSEs. The quinone redox reaction occurs within the potential region where the polymer is conducting, and fast redox conversion that involves lithium cycling during pendant group redox conversion was observed. These properties make conducting redox polymers promising candidates as cathode-active materials for safe and high-energy aqueous LIBs. An organic-based aqueous LIB, with a HQ-PEDOT as a cathode, Li4Ti5O12 (LTO) as an anode, and ca. 15 m lithium bis(trifluoromethanesulfonyl)imide water/dimethyl carbonate (DMC) as electrolyte, yielded an output voltage of 1.35 V and high rate capabilities up to 500C.
AB - Li-ion batteries (LIBs) raise safety and environmental concerns, which mostly arise from their toxic and flammable electrolytes and the extraction of limited material resources by mining. Recently, water-in-salt electrolytes (WiSEs), in which a large amount of lithium salt is dissolved in water, have been proposed to allow for assembling safe and high-voltage (>3.0 V) aqueous LIBs. In addition, organic materials derived from abundant building blocks and their tunable properties could provide safe and sustainable replacements for inorganic cathode materials. In the current work, the electrochemical properties of a conducting redox polymer based on poly(3,4-ethylenedioxythiophene) (PEDOT) with hydroquinone (HQ) pendant groups have been characterized in WiSEs. The quinone redox reaction occurs within the potential region where the polymer is conducting, and fast redox conversion that involves lithium cycling during pendant group redox conversion was observed. These properties make conducting redox polymers promising candidates as cathode-active materials for safe and high-energy aqueous LIBs. An organic-based aqueous LIB, with a HQ-PEDOT as a cathode, Li4Ti5O12 (LTO) as an anode, and ca. 15 m lithium bis(trifluoromethanesulfonyl)imide water/dimethyl carbonate (DMC) as electrolyte, yielded an output voltage of 1.35 V and high rate capabilities up to 500C.
KW - Conducting redox polymer
KW - Lithium ion battery
KW - Organic electronics
KW - Quinone
KW - Renewable energy storage
KW - Water-in-salt electrolyte
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U2 - 10.1016/j.elecom.2019.106489
DO - 10.1016/j.elecom.2019.106489
M3 - Article
AN - SCOPUS:85068463468
SN - 1388-2481
VL - 105
JO - Electrochemistry Communications
JF - Electrochemistry Communications
M1 - 106489
ER -