Frontiers in Energy Research (Feb 2020)
Tubular Graphene Nano-Scroll Coated Silicon for High Rate Performance Lithium-Ion Battery
Abstract
Owing to its high specific capacity and abundant reserves, silicon has been considered as a promising anode material for future lithium storage. However, its cycle life is seriously hindered by the huge volume variation and low conductivity. Therefore, it is crucial to effectively and easily prepare silicon anode with excellent performance. Herein, we introduce a simple method to prepare graphene nano-scroll coated silicon nanoparticles (Si@rGONSs) on a large scale. With the open tubular structure and the high conductivity of graphene, the obtained Si@rGONSs-2 electrode delivers a superior rate capacity of 866 mAh g−1 at 5 A g−1 and a capacity retention of 89.4% after 300 cycles. Furthermore, the Si@rGONSs//Li[Ni1/3Co1/3Mn1/3]O2 (NCM 111) full cell was successfully demonstrated, which achieves a stable capacity of 128.5 mAh g−1 at 0.5 C (1 C = 185 mAh g−1) and a high energy density of 406 Wh kg−1.
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