Carbon shell coated hollow NiCoSex composite as high-performance anode for lithium storage

Hollow NiCoSex (H-NiCoSex) nanospheres encapsulated with carbon shell were prepared via one-step easy solvothermal method followed by the carbon coating process. H-NiCoSex@C has large interior void with the uniform dimension around 350 nm and the thickness of carbon shell around 20-30 nm. Coupling with the large interior void as well as robust protective carbon shell, H-NiCoSex@C can retain the reversible capacity of 805.6 mAh center dot g(-1) after 100 cycles at 200 mA center dot g(-1). In particular, H-NiCoSex@C delivers large reversible capacity of 1532.2 mAh center dot g(-1) upon cycling for 1000 loops at 1000 mA center dot g(-1) with the capacity retention as high as 128.2% upon long period of activation. Even at the high rate of 3000 mA center dot g(-1), its specific capacity still retains up to 659.3 mAh center dot g(-1). The superior lithium storage performances for H-NiCoSex@C profit from its robust hollow core-shell structure as well as enhanced electrical conductivity and ion transport.

Automated summary

H-NiCoSex@C hollow NiCoSex nanospheres with carbon shell show superior lithium storage performance, maintaining large reversible capacity and high capacity retention due to its robust hollow core-shell structure and enhanced electrical conductivity and ion transport.