A flexible and binder-free reduced graphene oxide/Na-2/3[Ni1/3Mn2/3]O-2 composite electrode for high-performance sodium ion batteries

A novel, flexible and binder-free reduced graphene oxide/Na-2/3[Ni1/3Mn2/3]O-2 composite electrode (GNNM) has been fabricated by a simple technique. Reduced graphene oxide (RGO) establishes stable electrically conductive structures in the GNNM electrode. The prepared GNNM electrode delivers 86 mA h g(-1) at 0.1 C rate, and the capacity retention reaches 68.4% at 10 C rate. The discharge capacity of the GNNM electrode at 1 C rate can reach 80 mA h g(-1) after 200 cycles.