Mechanism
of Capacity Fade in Sodium Storage and the
Strategies of Improvement for FeS<sub>2</sub> Anode
Kongyao Chen
Wuxing Zhang
Lihong Xue
Weilun Chen
Xinghua Xiang
Min Wan
Yunhui Huang
10.1021/acsami.6b13421.s001
https://acs.figshare.com/articles/journal_contribution/Mechanism_of_Capacity_Fade_in_Sodium_Storage_and_the_Strategies_of_Improvement_for_FeS_sub_2_sub_Anode/4524683
Pyrite
FeS<sub>2</sub> has attracted extensive interest as anode
material for sodium-ion batteries due to its high capacity, low cost,
and abundant resource. However, the micron-sized FeS<sub>2</sub> usually
suffers from poor cyclability, which stems from structure collapse,
exfoliation of active materials, and sulfur dissolution. Here, we
use a synergistic approach to enhance the sodium storage performance
of the micron-sized FeS<sub>2</sub> through voltage control (0.5–3
V), binder choice, and graphene coating. The FeS<sub>2</sub> electrode
with the synergistic approach exhibits high specific capacity (524
mA h g<sup>–1</sup>), long cycle life (87.8% capacity retention
after 800 cycles), and excellent rate capability (323 mA h g<sup>–1</sup> at 5 A g<sup>–1</sup>). The results prove that a synergistic
approach can be applied in the micron-sized sulfides to achieve high
electrochemical performance.
2016-12-23 00:00:00
mA
FeS 2 Anode Pyrite FeS 2
structure collapse
capacity
sodium storage performance
graphene coating
anode material
sodium-ion batteries
FeS 2 electrode
approach exhibits
Sodium Storage
micron-sized sulfides
Capacity Fade
micron-sized FeS 2
sulfur dissolution
electrochemical performance