Amorphous hierarchical porous GeO(x) as high-capacity anodes for Li ion batteries with very long cycling life |
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Authors: | Wang Xiao-Liang Han Wei-Qiang Chen Haiyan Bai Jianming Tyson Trevor A Yu Xi-Qian Wang Xiao-Jian Yang Xiao-Qing |
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Institution: | Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA. |
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Abstract: | Many researchers have focused in recent years on resolving the crucial problem of capacity fading in Li ion batteries when carbon anodes are replaced by other group-IV elements (Si, Ge, Sn) with much higher capacities. Some progress was achieved by using different nanostructures (mainly carbon coatings), with which the cycle numbers reached 100-200. However, obtaining longer stability via a simple process remains challenging. Here we demonstrate that a nanostructure of amorphous hierarchical porous GeO(x) whose primary particles are ~3.7 nm diameter has a very stable capacity of ~1250 mA h g(-1) for 600 cycles. Furthermore, we show that a full cell coupled with a Li(NiCoMn)(1/3)O(2) cathode exhibits high performance. |
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