Synthesis of hollow GeO2 nanostructures, transformation into Ge@C, and lithium storage properties
Synthesis of hollow GeO2 nanostructures, transformation into Ge@C, and lithium storage properties
复制标题
DOI：
10.1039/c3ta11381g
复制
发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Guo, Zaiping
中科院分区：
文献类型：
--
作者：
Li, Li;Seng, Kuok Hau;Guo, Zaiping
在这项工作中，我们通过同时碳包覆和还原空心椭球GeO2前驱体的方法合成了中孔和中空的Ge@碳纳米结构。研究了以Ge4+/Sn4+为起始原料的GeO2椭球的形成机理。与实心椭球Ge@C-3相比，空心椭球Ge@C-1样品由于其独特的中空结构，表现出更好的循环稳定性(在0.2C倍率下200次循环后容量保持100%)和更高的倍率性能(20C下805 mA h g(-1))，因此这种空心椭球Ge@C-1样品可以被认为是一种潜在的锂离子电池负极材料。
In this work, we synthesize mesoporous and hollow germanium@carbon nanostructures through simultaneous carbon coating and reduction of a hollow ellipsoidal GeO2 precursor. The formation mechanism of GeO2 ellipsoids and the ratio of Ge4+ to Sn4+ as the starting materials are also investigated. Compared to the solid ellipsoidal Ge@carbon (Ge@C-3), the hollow ellipsoidal Ge@C-1 sample exhibits better cycling stability (100% capacity retention after 200 cycles at the 0.2 C rate) and higher rate capability (805 mA h g(-1) at 20 C) compared to Ge@C-3 due to its unique hollow structure; therefore, this hollow ellipsoidal Ge@carbon can be considered as a potential anode material for lithium ion batteries.