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Hard Carbon have become the most promising anode candidates for sodium‐ion batteries, but the poor rate performance and cycle life remain key issues. In this work, N‐doped hard carbon with abundant defects and expanded interlayer spacing is constructed by using carboxymethyl cellulose sodium as precursor with the assistance of graphitic carbon nitride. The formation of N‐doped nanosheet structure...
Na3V2(PO4)2F3 has attracted wide attention due to its high voltage platform, and stable crystal structure. However, its application is limited by the low electronic conductivity and the ease formation of impurity. In this paper, the spherical Br‐doped Na3V2(PO4)2F3/C is successfully obtained by a one‐step spray drying technology. The hard template polytetrafluoroethylene (PTFE) supplements the loss...
Sodium‐ion batteries (SIBs) are considered a prospective candidate for large‐scale energy storage due to the merits of abundant sodium resources and low cost. However, a lack of suitable advanced anode materials has hindered further applications. Herein, metal–semiconductor mixed phase twinned hierarchical (MPTH) MoS2 nanowires with an expanded interlayer (9.63 Å) are engineered and prepared using...
SnP2O7 attached to reduced graphene oxide (rGO) is synthesized by a solvothermal reaction, followed by a mild annealing in Ar/H2. As an anode material for sodium‐ion batteries, this composite is associated with the conversion reaction between Sn and SnP2O7 and the alloy reaction between Sn and NaxSn, as evidenced by ex situ techniques, such as high‐resolution transmission electron microscope images,...
For alkali metal ion batteries, probing the ion storage mechanism (intercalation‐ or conversion‐type) and concomitant phase evolution during sodiation–desodiation cycling is critical to gain insights into understanding how the electrode functions and thus how it can be improved. Here, by using in situ transmission electron microscopy, the whole sodiation–desodiation process of spinel NiCo2O4 nanorods...
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