TY - JOUR
T1 - Ultrafast Charge/Discharge by a 99.9% Conventional Lithium Iron Phosphate Electrode Containing 0.1% Redox-Active Fluoflavin Polymer
AU - Hatakeyama-Sato, Kan
AU - Akahane, Tomoki
AU - Go, Choitsu
AU - Kaseyama, Takahiro
AU - Yoshimoto, Takuji
AU - Oyaizu, Kenichi
N1 - Funding Information:
This work was partially supported by Grants-in-Aid for Scientific Research (Nos. 17H03072, 18K19120, 18H05515, and 19K15638) from MEXT, Japan. The work was also partially supported by the Research Institute for Science and Engineering and its Grant-in-Aid for Young Scientists, Waseda University.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/5/8
Y1 - 2020/5/8
N2 - Exceptionally large output (current density over 20 mA/cm2) is achieved by a 99.9 wt % conventional LiFePO4 cathode for lithium ion batteries. Adding just 0.1 wt % redox-active fluoflavin polymer to the electrode improves the electrochemical performance dramatically. The polymer's redox potentials of 3.3 and 3.7 V vs Li/Li+, sandwiching that of LiFePO4 (3.4 V), are critical in accelerating the charge and discharge processes by electrochemical mediation. The lower overvoltage also helps to suppress electrode degradation and improve the cycle life of the cell (over 1000 cycles). The DC pulse technique reveals the transient, dynamic electrochemical mediation, which cannot be observed by conventional steady-state impedance spectroscopy. These dramatic improvements in material properties achieved by the catalytic amount of the organic additive (0.1 wt %) give new insights into organic/inorganic hybrid chemistry and may lead to the development of energy-related materials with improved properties.
AB - Exceptionally large output (current density over 20 mA/cm2) is achieved by a 99.9 wt % conventional LiFePO4 cathode for lithium ion batteries. Adding just 0.1 wt % redox-active fluoflavin polymer to the electrode improves the electrochemical performance dramatically. The polymer's redox potentials of 3.3 and 3.7 V vs Li/Li+, sandwiching that of LiFePO4 (3.4 V), are critical in accelerating the charge and discharge processes by electrochemical mediation. The lower overvoltage also helps to suppress electrode degradation and improve the cycle life of the cell (over 1000 cycles). The DC pulse technique reveals the transient, dynamic electrochemical mediation, which cannot be observed by conventional steady-state impedance spectroscopy. These dramatic improvements in material properties achieved by the catalytic amount of the organic additive (0.1 wt %) give new insights into organic/inorganic hybrid chemistry and may lead to the development of energy-related materials with improved properties.
UR - http://www.scopus.com/inward/record.url?scp=85090336530&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85090336530&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.0c00622
DO - 10.1021/acsenergylett.0c00622
M3 - Article
AN - SCOPUS:85090336530
VL - 5
SP - 1712
EP - 1717
JO - ACS Energy Letters
JF - ACS Energy Letters
SN - 2380-8195
IS - 5
ER -