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Mechanism of Capacity Fade in Sodium Storage and the Strategies of Improvement for FeS2 Anode
journal contribution
posted on 2016-12-23, 00:00 authored by Kongyao Chen, Wuxing Zhang, Lihong Xue, Weilun Chen, Xinghua Xiang, Min Wan, Yunhui HuangPyrite
FeS2 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 FeS2 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 FeS2 through voltage control (0.5–3
V), binder choice, and graphene coating. The FeS2 electrode
with the synergistic approach exhibits high specific capacity (524
mA h g–1), long cycle life (87.8% capacity retention
after 800 cycles), and excellent rate capability (323 mA h g–1 at 5 A g–1). The results prove that a synergistic
approach can be applied in the micron-sized sulfides to achieve high
electrochemical performance.