TY - JOUR
T1 - Non-alloy Mg anode for Ni-MH batteries
T2 - Multiple approaches towards a stable cycling performance
AU - Xu, Yaolin
AU - Mulder, Fokko M.
PY - 2021
Y1 - 2021
N2 - Mg attracts much research interest as anode material for Ni-MH batteries thanks to its lightweight, cost-effectiveness and high theoretical capacity (2200 mA h g−1). However, its practical application is tremendously challenged by the poor hydrogen sorption kinetics, passivation from aggressive aqueous electrolytes, and insulating nature of MgH2. Mg-based alloys exhibit enhanced hydrogen sorption kinetics and electrical conductivity, but significant amount of costly transition metal elements are required. In this work, we have, for the first time, utilized non-alloyed but catalyzed Mg as anode for Ni-MH batteries. 5 mol.% TiF3 was added to nanosized Mg for accelerating the hydrogen sorption kinetics. Several strategies for preventing the problematic passivation of Mg have been studied, including protective encapsulation of the electrode and utilizing room-temperature/high-temperature ionic liquids and an alkaline polymer membrane as working electrolyte. Promising electrochemical performance has been achieved in this Mg–TiF3 composite anode based Ni-MH batteries with room for further improvements.
AB - Mg attracts much research interest as anode material for Ni-MH batteries thanks to its lightweight, cost-effectiveness and high theoretical capacity (2200 mA h g−1). However, its practical application is tremendously challenged by the poor hydrogen sorption kinetics, passivation from aggressive aqueous electrolytes, and insulating nature of MgH2. Mg-based alloys exhibit enhanced hydrogen sorption kinetics and electrical conductivity, but significant amount of costly transition metal elements are required. In this work, we have, for the first time, utilized non-alloyed but catalyzed Mg as anode for Ni-MH batteries. 5 mol.% TiF3 was added to nanosized Mg for accelerating the hydrogen sorption kinetics. Several strategies for preventing the problematic passivation of Mg have been studied, including protective encapsulation of the electrode and utilizing room-temperature/high-temperature ionic liquids and an alkaline polymer membrane as working electrolyte. Promising electrochemical performance has been achieved in this Mg–TiF3 composite anode based Ni-MH batteries with room for further improvements.
KW - Alkaline polymer membrane
KW - Electrochemical hydrogen storage
KW - Encapsulation
KW - Ionic liquid
KW - MgH
KW - Ni-MH batteries
UR - http://www.scopus.com/inward/record.url?scp=85106248230&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2021.03.073
DO - 10.1016/j.ijhydene.2021.03.073
M3 - Article
AN - SCOPUS:85106248230
SN - 0360-3199
VL - 46
SP - 19542
EP - 19553
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 37
ER -