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) 1/3O 2 cathode exhibits high performance.
All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry