Preparation and Characteristics of Core-Shell Structure with Nano Si/Graphite Nanosheets Hybrid Layers Coated on Spherical Natural Graphite as Anode Material for Lithium-ion Batteries

Silicon (Si) is recognized as a promising anode material for high-energy-density lithium-ion batteries. However, under condition of electrode comparable to commercial graphite anodes with low binder content and high density, the practical use Si limited due huge volume change associated Si-Li alloying/de-alloying. Here, we report novel core-shell composite, having reversible capacity ~ 500 mAh g−1, by forming shell composed mixture nano-Si, nanosheets pitch carbon on spherical natural particle. The electrochemical measurements are performed using electrodes 2 wt % styrene butadiene rubber (SBR) wt.% carboxymethyl cellulose (CMC) in an density 1.6 g cm−3. composites 478 g−1 shows outstanding retention 99% after 100 cycles initial coulombic efficiency 90%. heterostructure appears be very effective buffering during cycling. Keywords: Core-Shell Composites, Si-Graphite Composite Anode, Electrochemical Performance, Anode Material, Lithium-Ion Battery