▎ 摘　　要

Nowadays, metal oxalates with high discharge/charge capacities were chosen as new anode materials for batteries. Here, novel nickel oxalates microtubes with manganese doping and graphene Oxide (Ni0.8Mn0.2C2O4.2 H2O/GO) are synthesized at low temperature through a facile microwave-assisted sol-vothermal method. The X-ray diffraction confirmed a formation of a pure binary compound of Ni0.8Mn0.2C2O4.2 H2O/GO without contamination by other compounds of Nickel or Manganese. Furthermore, the formed product shows a good crystallinity and has a high surface area of 24.3 m2 g-1. With the assistance of graphene, the material delivers a high discharge capacity of 1781 mA h g-1. Even at high current densities of 5.0 and 10.0 A g-1, discharge capacities of 1138.1 and 891.0 mA h g-1 can be obtained. Encouraged by the superior rate performance, the long-term cycling performance at 10 A g-1 and 20 A g-1 was tested showing a discharge of 676.6 mA h g-1 after 300 cycles and 346.4 mA h g-1 after 1000 cycles. The remarkable electrochemical performance can be attributed to the doping of Mn in the structure of NiC2O4 .2 H2O and the contribution of graphene. (c) 2023 Elsevier B.V. All rights reserved.