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deliver a reversible capacity of 250 mAh g -1 with excellent cycling stability. The
capacity of Sb/C nanocomposite can achieve 420 mAh g -1 based on the material
including Sb and carbon. The electrochemical performance of these anode mate-
rials is close or superior to graphite commercially used in Li-ion batteries. If we
use the above-mentioned materials to construct practical Na-ion batteries, the
energy density of the batteries would be close to the commercial graphite/LiFePO 4
system. Although some achievements are obtained in Na intercalation materials,
they are still far from realizing the real utility of Na-ion batteries. Some work
should be further pursued, such as the industrial mass production of materials,
balance and interaction of the cathode and anode, special design of the cell con-
figuration, and safety protection of batteries. All in all, the development of Na-ion
batteries is facing great chances as well as challenges, we believe that through the
unremitting efforts of scientists, this newly emerging energy storage system will
finally realize its application.
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