Ultrafast
Zinc-Ion Diffusion Ability Observed in 6.0-Nanometer
Spinel Nanodots
Posted on 2019-08-07 - 14:38
Rechargeable
aqueous Zn-ion batteries (ZIBs) have recently attracted
much attention due to their low cost and superior safety. Unfortunately,
their low capacity and poor cycle life still hinder their practical
application. Here, we have developed a general synthesis strategy
for ultrasmall spinel oxide nanodots (Mn3O4,
CoMn2O4, MnCo2O4.5, Co3O4, and ZnMn2O4) with abundant
oxygen vacancies and highly active surface. Among them, 6.0-nanometer-sized
Mn3O4 nanodots deliver the best Zn-ion storage
ability with a high reversible capacity of 386.7 mA h g–1 at 0.1 A g–1, excellent rate performance, and
a long-term stability of 500 cycles at 0.5 A g–1. Taking advantage of the highly activated surficial atoms, shortened
transfer pathway, and introduction of numerous oxygen vacancies, an
ultrahigh Zn2+ diffusion coefficient of 2.4 × 10–10 cm2 s–1 has been detected
during the discharge process. This value is more than 2 orders of
magnitude higher than that of other spinel oxide nanostructures in
previous reports and also the highest one in all of the as-reported
ZIB cathode materials to date. Our finding offers promising opportunities
for the development of ZIB cathode materials with high energy density,
long-term cycling stability, excellent flexibility, and wearability.
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Jiang, Le; Wu, Zeyi; Wang, Yanan; Tian, Wenchao; Yi, Zhiying; Cai, Cailing; et al. (2019). Ultrafast
Zinc-Ion Diffusion Ability Observed in 6.0-Nanometer
Spinel Nanodots. ACS Publications. Collection. https://doi.org/10.1021/acsnano.9b04165
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AUTHORS (8)
LJ
Le Jiang
ZW
Zeyi Wu
YW
Yanan Wang
WT
Wenchao Tian
ZY
Zhiying Yi
CC
Cailing Cai
YJ
Yingchang Jiang
LH
Linfeng Hu
KEYWORDS
vacancyZn-ion storage abilityUltrafast Zinc-Ion Diffusion Ability ObservedMn 3 O 4stabilityas-reported ZIB cathode materialsZIB cathode materialsCoMn 2 O 46.0- Nanometer Spinel Nanodots RechargeableCo 3 O 4capacityZnMn 2 O 46.0- nanometer-sized Mn 3 O 4 nanodotsMnCo 2 O 4.5oxygen vacanciesultrasmall spinel oxide nanodotsspinel oxide nanostructures