Nano Graphene Shell for Silicon Nanoparticles: A Novel Strategy for a High Stability Rechargeable Battery Anode
CHEMISTRYSELECT(2018)
摘要
Many strategies have been adapted to improve the stability of silicon (Si) based anodes, one of the widely studied methods is to make Si-graphene (Si-Gr) materials, all have adapted the sandwiched structure of Si-Gr or Si-graphene oxide (Si-GO) where Si nanoparticles (NP) are sandwiched between Gr based materials. Herein, we report a simple strategy to achieve Si-Gr based anode with a different structure than that of the intercalated structure, which is expected to provide better stability to the Si-Gr based anode, i.e. a core-shell structure. This core-shell structure based on a Si-nanographene oxide (Si-nGO) delivers an initial reversible specific capacity of similar to 2000 mAhg(-1) and stability of >= 250 cycles with 80% capacity retention at an active material (AM) AM mass loading of 1.5 mg cm(-2), and at similar to 2.0 mg cm(-2), similar to 160 cycles stability was achieved, which is one of the best reported values, meanwhile, intercalated Si-graphene oxide (Si-GO) exhibited only < 50 cycles stability at similar to 2.0 mg cm 2 mass loading. Higher current rate performance of Si-nGO was similar to 70% retention of the initial capacity at 5 C, whereas Si-GO retention was < 25% at 5 C. Thus a change in the structure of Si-Gr based anode has improved the stability remarkably and shows that it is a promising strategy towards achieving electrode material for advanced lithium-ion batteries (LIBs).
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关键词
Anode material,Core-shell,Lithium ion battery,Mass loading,Silicon-graphene
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