Ultrahigh-rate lithium-ion batteries with 3D fungus-structured carbon/CuC2O4·xH2O electrodes
Herein, an excellent anode material, which comprised the 3D fungus-structured carbon (3DFC) and the CuC2O4·xH2O nanocrystal, was demonstrated for lithium ion batteries (LIBs). The hierarchically porous carbon provided an ideal structure for rapid electron and ion transport and the unique redox properties of CuC2O4·xH2O nanocrystals inhibited the formation of a solid electrolyte interphase, leading to excellent C-rate capacity and cycling stability. The LIBs with the 3DFC@CuC2O4·xH2O anode exhibited reversible capacities of 1158.6 mA h g−1 at 0.5C rate, 593.1 mA h g−1 at 10C, and 250 mA h g−1 at 100C rate (1C = 372 mA h g−1). Furthermore, excellent capacity recycling stability was obtained even at very high C rates, namely, the capacity retention after 1000 cycles still achieved 93.8% at 10C rate and 92.4% at 100C rate. In addition, only 21.8 seconds at 100C was needed for the battery to complete the charging process.