Preparation and Properties of Phosphorus Doped Si@C Anode Material
With micron silicon powder as matrix,phosphorus-doped silicon-carbon composite material(Si-P@C)was synthesized by solid-state thermal diffusion and high-temperature pyrolysis,and then used as anode material of lithium-ion batteries.The results show that Si-P@C anode material demonstrates an initial discharge specific capacity up to 2164 mAh/g at a current density of 0.2 A/g.Compared with pure silicon,Si-P@C anode material presents greatly improved cycling performance.After 50 cycles at a current density of 0.5 A/g,it demonstrates a high reversible specific capacity of 1 176 mAh/g,with the capacity retention ratio of 73.5%.It is concluded that phosphorus-doping and carbon coating can effectively improve the electron transfer ability and reaction kinetics of silicon anode.
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