Lithium-ion batteries have the advantages of high energy density,long service life,green environment protection and good safety performance.Silica is one of the most promising anode materials for lithium-ion batteries because of its high theoretical specific capacity,abundant reserves,and pollution-free characteristics.However,the volume effect of silica in the process of lithiation/delithiation makes the performance of lithium-ion batteries greatly reduced.To improve the electrochemical performance of lithium-ion batteries,silica/carbon(SiO2@C)composites were prepared in this paper and used as anode materials for lithium-ion batteries.The hollow structure effectively alleviates the volume expansion of silica during charging and discharging,and improves the structural stability of composites during lithiation/delithiation process.The carbon layer can be used as a buffer layer to mitigate the volume expansion of silica,and carbon has good electrical conductivity,which can improve the electrical conductivity of composites.After 50 cycles at 0.1 A·g-1 current density,the discharge capacity of SiO2@C is 766.2 mAh·g-1,which exhibits good electrochemical performance.
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维普
