Herein, a graphene oxide (GO)-wired manganese silicate (MS) hollow sphere (MS/GO) composite is successfully synthesized. Such an architecture possesses multiple advantages in lithium and sodium storage. The hollow MS structure provides a sufficient free space for volume variation accommodation; the porous and low-crystalline features facilitate the diffusion of lithium ions; meanwhile, the flexible GO sheets enhance the electronic conductivity of the composite to a certain degree. When applied as the anode material for lithium-ion batteries (LIBs), the as-obtained MS/GO composite exhibits a high reversible capacity, ultrastable cyclability, and good rate performance. Particularly, the MS/GO composite delivers a high capacity of 699 mA h g even after 1000 cycles at 1 A g. The sodium-storage performance of MS/GO has been studied for the first time, and it delivers a stable capacity of 268 mA h g after 300 cycles at 0.2 A g. This study suggests that the rational design of metal silicates would render them promising anode materials for LIBs and SIBs.
Anode materials with high capacity are urgently required to substitute graphite. The theoretical gravimetric and volumetric capacities of Bi 2 S 3 are much higher than those of graphite, but the cycling performance of Bi 2 S 3 is poor due to its large volumetric expansion. Amorphous SiO 2 is mechanically rigid, which can buffer the volume change. A novel Bi 2 S 3 @SiO 2 core-shell microwire is firstly designed and synthesized in this work. The composite exhibits excellent electrochemical performances. The discharge capacity is 379 mA h g −1 after 4000 cycles at the current density of 1 A g −1 .
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