37
Cathode morphologies/preparative methods Electrolyte + additive
Potential
window
Current density (mA g
−1
)
Cyclability (mAh g
−1
)
Ref.
α-MnO 2 -graphene / hydrothermal followed
by freeze-drying process
2 M ZnSO
4 + 0.1 M MnSO
4
0.9–1.8
3C (1C = 240 mAh g
−1
)
160 after 300 cycles
[57]
α-MnO 2 @PPy core–shell nanorods /
co-precipitation followed by in situ
polymerization
1 M ZnSO
4 + 0.1 M MnSO
4
1.0–1.8
100 mA g
−1
85 after 100 cycles
[58]
Recent Developments of Zinc-Ion Batteries
Cathode morphologies/preparative methods Electrolyte + additive
Potential
window
Current density (mA g
−1
)
Cyclability (mAh g
−1
)
Ref.
α-MnO 2 -graphene / hydrothermal followed
by freeze-drying process
2 M ZnSO
4 + 0.1 M MnSO
4
0.9–1.8
3C (1C = 240 mAh g
−1
)
160 after 300 cycles
[57]
α-MnO 2 @PPy core–shell nanorods /
co-precipitation followed by in situ
polymerization
1 M ZnSO
4 + 0.1 M MnSO
4
1.0–1.8
100 mA g
−1
85 after 100 cycles
[58]
Recent Developments of Zinc-Ion Batteries