TY - JOUR
T1 - Advanced Hybrid Electrolyte Li-O2 Battery Realized by Dual Superlyophobic Membrane
AU - Qiao, Yu
AU - Wang, Qifei
AU - Mu, Xiaowei
AU - Deng, Han
AU - He, Ping
AU - Yu, Jihong
AU - Zhou, Haoshen
N1 - Publisher Copyright:
© 2019 Elsevier Inc.
PY - 2019/12/18
Y1 - 2019/12/18
N2 - Although water-in-salt (WiS) electrolyte has triggered a relatively clean Li2O2 redox reaction, the practical stored energy density and energy efficiency of current Li-O2 battery systems remains incomparable with that of the state-of-the-art Li-ion batteries. Besides, the awkward position of the cathodic stability limit of WiS further squeezes the practical output voltage. Herein, we make a breakthrough in this “output-voltage limitation” by adopting hybrid-electrolyte design into a dual-compartment cell architecture, in which the WiS catholyte and ionic liquid anolyte are segregated by a flexible under-liquid dual superlyophobic polymer membrane. Moreover, the boosted capacity and restrained overpotential are systematically ascribed to a solution-based Li2O2 accumulation-hydrolysis mechanism. Controlling with 3.6 V charging cut-off voltage, Li-O2 cell performs high areametric capacity (2.5 mAh/cm2), remarkable energy efficiency (∼0.47 V overpotential), and impressive long-term reversibility (Coulombic efficiency, 99.5%) over 250 cycles, which makes the Li-O2 battery technology really competitive.
AB - Although water-in-salt (WiS) electrolyte has triggered a relatively clean Li2O2 redox reaction, the practical stored energy density and energy efficiency of current Li-O2 battery systems remains incomparable with that of the state-of-the-art Li-ion batteries. Besides, the awkward position of the cathodic stability limit of WiS further squeezes the practical output voltage. Herein, we make a breakthrough in this “output-voltage limitation” by adopting hybrid-electrolyte design into a dual-compartment cell architecture, in which the WiS catholyte and ionic liquid anolyte are segregated by a flexible under-liquid dual superlyophobic polymer membrane. Moreover, the boosted capacity and restrained overpotential are systematically ascribed to a solution-based Li2O2 accumulation-hydrolysis mechanism. Controlling with 3.6 V charging cut-off voltage, Li-O2 cell performs high areametric capacity (2.5 mAh/cm2), remarkable energy efficiency (∼0.47 V overpotential), and impressive long-term reversibility (Coulombic efficiency, 99.5%) over 250 cycles, which makes the Li-O2 battery technology really competitive.
KW - Li-O battery
KW - hybrid-electrolyte strategy
KW - under-liquid dual superlyophobic membrane
KW - water-in-salt electrolyte
UR - http://www.scopus.com/inward/record.url?scp=85076249063&partnerID=8YFLogxK
U2 - 10.1016/j.joule.2019.09.002
DO - 10.1016/j.joule.2019.09.002
M3 - Article
AN - SCOPUS:85076249063
SN - 2542-4351
VL - 3
SP - 2986
EP - 3001
JO - Joule
JF - Joule
IS - 12
ER -
