The synthesis of one copper-sodium complex and electrochemical performance as the anode for lithium-ion batteries

Porous structure and abundant lithium storage sites give complexes superior redox activity. In this work, one copper-sodium complex is successfully synthesized, named as Na2Cu(C2O4)2.2H2O. While applied as the anode for lithium-ion batteries (LIBs), it presents high reversible capacity (400 mAh/g) and cycling stability. Even after experiencing an increased discharge/charging rate, the electrode still exhibits good lithium storage performance at 2 A/g. The exceptional performance of energy-storage is mainly dependent on the synergistic effect of copper and sodium metal ions, abundant lithium storage sites and the porous structure of Na2Cu(C2O4)2.2H2O. Due to the low cost and simple synthetic process, this work would offer a practical approach for the development of commercially available negative materials in LIBs.