Preparation of Ultra-High Capacity Anode C/SnO₂@NC@CC for Lithium-Ion Batteries

Abstract

SnO₂-based anodes for lithium-ion batteries(LIBs)experience volume expansion,leading to rapid capacity decay and low conductivity. To address this problem,a composite consists of C/SnO₂with a core-shell structure and a carbonized nitrogen-doped Co-metal organic framework(Co-MOF)(NC)supported on carbon cloth(CC)was designed and prepared,which was denoted as C/SnO₂@NC@CC. C/SnO₂@NC@CC could be used directly as a flexible anode for LIBs. The combination of core-shell structure centered on carbon spheres,carbonized nitrogendoped Co-MOF,and CC not only restricts the volume expansion but also functions as conductive networks to improve the electrical conductivity. C/SnO₂@NC@CC exhibits excellent electrochemical performance with charge and discharge specific capacities of 2 066. 0 and2 077. 1 mAh/g,respectively,after 120 cycles at a current density of 0. 5 A/g.

Keywords

lithium-ion battery(LIB) / SnO₂ anode / core-shell structure / electrode kinetics

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Funding

National Natural Science Foundation of China(61376017)