2 research outputs found
Low-Temperature and High-Performance Vanadium-Based Aqueous Zinc-Ion Batteries
Aqueous
zinc-ion batteries have attracted attention due to their
low cost and high safety. Unfortunately, dendrite growth, hydrogen
evolution reactions, cathodic dissolution, and other problems are
more serious; not only that, but also the cathodic and anodic materials’
lattices contract when the temperature drops, and charge transfer
and solid phase diffusion become slow, seriously aggravating dendrite
growth. At present, there are few studies on the low-temperature system,
and studies on retaining high specific capacity are even more rare.
Herein, ethylene glycol (EG) and manganese sulfate (MSO) are selected
as additives, and the manganese vanadate (MVO) cathode is used to
find a high-performance solution at low temperature. MVO can provide
higher specific capacity and better structural stability than MnO2 to adapt to a low-temperature environment. At the same time,
Mn2+ in MSO can produce a cationic shield covering the
initial zinc tip at an appropriate concentration to avoid the tip
effect and inhibit the dissolution of MVO. EG can not only reduce
the freezing point of the electrolyte but also promote the desolvation
of [Zn(H2O)6]2+. The synergistic
effect of the three elements prevents the dissolution equilibrium
of Mn2+ in MVO from fluctuating greatly due to the change
of temperature. Therefore, when we use [email protected] M MnSO4 +
2 M ZnSO4 (EG + 0.2Mn/2ZSO) electrolyte at −30 °C,
the Zn||Zn batteries which used this type of electrolyte can remain
350 h at 1 mA cm–2 without failure. The Zn||Cu batteries
can retain 100% Coulombic efficiency after more than 2000 cycles at
0.2 mA cm–2. The Zn||MVO battery can reach 231.13
mA h g–1 at its first cycle, and the capacity retention
rate is still above 85% after 1000 cycles, which is higher than that
of the existing low-temperature research system
Low-Temperature and High-Performance Vanadium-Based Aqueous Zinc-Ion Batteries
Aqueous
zinc-ion batteries have attracted attention due to their
low cost and high safety. Unfortunately, dendrite growth, hydrogen
evolution reactions, cathodic dissolution, and other problems are
more serious; not only that, but also the cathodic and anodic materials’
lattices contract when the temperature drops, and charge transfer
and solid phase diffusion become slow, seriously aggravating dendrite
growth. At present, there are few studies on the low-temperature system,
and studies on retaining high specific capacity are even more rare.
Herein, ethylene glycol (EG) and manganese sulfate (MSO) are selected
as additives, and the manganese vanadate (MVO) cathode is used to
find a high-performance solution at low temperature. MVO can provide
higher specific capacity and better structural stability than MnO2 to adapt to a low-temperature environment. At the same time,
Mn2+ in MSO can produce a cationic shield covering the
initial zinc tip at an appropriate concentration to avoid the tip
effect and inhibit the dissolution of MVO. EG can not only reduce
the freezing point of the electrolyte but also promote the desolvation
of [Zn(H2O)6]2+. The synergistic
effect of the three elements prevents the dissolution equilibrium
of Mn2+ in MVO from fluctuating greatly due to the change
of temperature. Therefore, when we use [email protected] M MnSO4 +
2 M ZnSO4 (EG + 0.2Mn/2ZSO) electrolyte at −30 °C,
the Zn||Zn batteries which used this type of electrolyte can remain
350 h at 1 mA cm–2 without failure. The Zn||Cu batteries
can retain 100% Coulombic efficiency after more than 2000 cycles at
0.2 mA cm–2. The Zn||MVO battery can reach 231.13
mA h g–1 at its first cycle, and the capacity retention
rate is still above 85% after 1000 cycles, which is higher than that
of the existing low-temperature research system