3 years ago

Porous and Low-Crystalline Manganese Silicate Hollow Spheres Wired by Graphene Oxide for High-Performance Lithium and Sodium Storage

Porous and Low-Crystalline Manganese Silicate Hollow Spheres Wired by Graphene Oxide for High-Performance Lithium and Sodium Storage
Liang Zhou, Narui Li, Changwei Shi, Chunjuan Tang, Jiexin Zhu, Zechao Zhuang, Liqiang Mai
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–1 even after 1000 cycles at 1 A g–1. 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–1 after 300 cycles at 0.2 A g–1. This study suggests that the rational design of metal silicates would render them promising anode materials for LIBs and SIBs.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b06088

DOI: 10.1021/acsami.7b06088

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