Room-temperature synthesis of a cobalt 2,3,5,6-tetrafluoroterephthalic coordination polymer with enhanced capacity and cycling stability for lithium batteries

A novel cobalt 2,3,5,6-tetrafluoroterephthalic coordination polymer has been synthesized at room temperature. With a nanosphere and lamination secondary structure, the as-prepared Co-TFBTC displayed a high capacity of 1074.6 mA h g⁻¹ after 50 cycles in the voltage range of 0.01-3 V versus Li/Li⁺. The ex situ sXAS results show that Co²⁺ was not involved in the lithiation reaction, which suggests the redox participation of the TFBDC ligand. The present results show promise for Co-TFBDC to be applied as high performance lithium-ion battery anodes.