Abstract
S-doped carbon is investigated as a high-performance anode material for sodium-ion batteries. Due to the introduction of a high-content of S atoms, the as-obtained S-doped carbon shows an enlarged interlayer distance. As an anode, a high specific capacity of up to 303 mAh g-1 is achieved, even after 700 cycles at 0.5 A g-1.
Highlights
The increasing demand on lithium-ion batteries (LIBs) has led to potential insufficiency of lithium resource
Since Na+ ion has larger ionic radius and inappropriate insertion/extraction potential as compared with Li+ ion, many electrode materials used for LIBs show very limited activity or even fail when being tested as hosts for Na+ ions, which greatly hinders the development of sodium-ion batteries (SIBs)
The results show that the as-obtained bulk-sized sulfur-doped carbon (SC) possesses larger interlayer distance (≈0.39 nm) but lower specific surface area (39.8 m2 g−1) than those of N-doped carbon (NC) with nanosheet structure (≈0.36 nm and 139.7 m2 g−1)
Summary
The increasing demand on lithium-ion batteries (LIBs) has led to potential insufficiency of lithium resource. Carbons with various nanostructures such as hollow nanospheres,[5] nanosheets,[6] nanofibers,[7] hollow nanowires,[8] graphene,[9] and porous carbons [10] have been investigated, and reversible capacities of ≈300 mAh g−1 have been achieved.[11] the reduced particle sizes or porous structures always cause enlarged specific surface area of the carbons, leading to low initial Coulombic efficiency, and greatly reduce the energy density of the battery and result in poor cycling performance
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