Ultrahigh-rate lithium-ion batteries with 3D fungus-structured carbon/CuC2O4 electrodes
Herein, an excellent anode material, which comprises the 3D fungus-structured carbon (3DFC) and the CuC2O4 nanocrystal, was demonstrated for lithium ion batteries (LIBs). The hierarchically porous carbon provides an ideal structure for rapid electron and ion transport and the unique redox property of CuC2O4 nanocrystals inhibited the formation of solid electrolyte interphase, leading to excellent C-rate capacity and cycling stability. The LIBs with 3DPC@CuC2O4 anode exhibited reversible capacities of 1158.6 mAh/g at 0.5C rate, 593.1 mAh/g at 10C, and 250 mAh/g at 100C rate (1C = 372 mAh/g). Furthermore, excellent capacity recycling stability was obtained even at very high C rate, namely, the capacity retention after 1000 cycles still achieved 93.8% at 10C rate and 92.4% at 100C rate. In addition, only 21 seconds at 100C is needed for the battery to complete the charging process.