Ion-assisted construction of Sb/N-doped graphene as an anode for Li/Na ion batteries

摘要

Although secondary batteries are common in many fields, new electrode materials with a reasonable structure are desired for high battery performance. Herein, Sb/N-doped graphene nanosheets (NGNS-Q) were constructed with the help of 7,7,8,8-tetracyanoquinodimethane anions (TCNQ center dot(-)). TCNQ center dot(-) were used to anchor Sb3+ into the graphene layer by electrostatic interaction, which improves the distribution of Sb nanoparticles. Meanwhile, TCNQ center dot(-) act as a N source to form N-doped graphene, enhancing the electron conductivity of the composite. Benefiting from the stable structure and good conductivity, the Sb/NGNS-Q composite achieved good electrochemical battery performance for Li/Na ion batteries (LIBs/SIBs). At a current density of 0.1 A g(-1), Sb/NGNS-Q exhibited a capacity of 615 mAh g(-1) after cycling 200 times and 240 mAh g(-1) after 100 cycles for LIBs and SIBs, respectively.