State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology , Wuhan 430070, Hubei, P. R. China.
Department of Mathematics and Physics, Luoyang Institute of Science and Technology , Luoyang 471023, P. R. China.
ACS Appl Mater Interfaces. 2017 Jul 26;9(29):24584-24590. doi: 10.1021/acsami.7b06088. Epub 2017 Jul 14.
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.
在此，成功合成了一种氧化石墨烯（GO）连接的硅酸锰（MS）空心球（MS/GO）复合材料。这种结构在锂和钠存储方面具有多种优势。空心 MS 结构为体积变化提供了充足的自由空间；多孔和低结晶特性有利于锂离子的扩散；同时，柔性 GO 片在一定程度上提高了复合材料的电子导电性。当用作锂离子电池（LIBs）的阳极材料时，所获得的 MS/GO 复合材料表现出高可逆容量、超稳定的循环性和良好的倍率性能。特别是，MS/GO 复合材料在 1 A g 的电流密度下循环 1000 次后，仍能提供高达 699 mA h g 的高容量。这是首次研究 MS/GO 的储钠性能，其在 0.2 A g 的电流密度下循环 300 次后，仍能提供稳定的 268 mA h g 的容量。这项研究表明，合理设计金属硅酸盐将使它们成为锂离子电池和钠离子电池有前途的阳极材料。
