Carbon-Coated Si Nanoparticles Anchored between Reduced Graphene Oxides as an Extremely Reversible Anode Material for High Energy-Density Li-Ion Battery. This new proposed method provides a new research idea for preparing lithium ion battery anode materials with excellent electrochemical performance.Īgyeman D A,Song K,Lee G H, et al. Compared with the one-step carbon-coated silicon(Si/C) material, Si/C/C material not only effectively improves the conductivity but inhibits the volume expansion of Si particles during lithiation and de-lithiation. The cycle efficiency retention of the product is 76.61% after 100 cycling times at the current density of 2 A/g, which also demonstrates its high stability. h/g at a current density of 0.1 A/g at a current density of 3 A/g, the composite has a specific discharge capacity of 582 mA.In addition, the Si/C/C-27% composite has a specific discharge capacity of 1281 mA The Si nanoparticles coated with C are bonded to each other to form a C-Si-C network structure, in which the silicon(27% mass fraction)/carbon composite (Si/C/C-27%) exhibits good lithium storage performance as a lithium battery electrode material. The results show that the obtained composite has a particle size in the range of 300 to 350 nm. The electrochemical properties of the as-obtained composites as the negative electrode of the lithium ion batteries were systematically investigated. Commercially available nano-silicon and coal pitch with low softening point, high carbon ratio and low price were used as the silicon and carbon sources, respectively. Silicon/carbon (Si/C/C) composites based on the coal pitch was successfully prepared by a two-step method.
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