Tartaric acid assisted carbonization of LiFePO4 synthesized through in situ hydrothermal process in aqueous glycerol solution

摘要: An in situ hydrothermal synthesis process was explored to prepare nano-sized high performance lithium iron phosphate carbon composite (LFPin/C) as active cathode material for ion batteries. Tartaric acid (TA), chelating agent and source, added into glycerol/water solution forming a homogeneous precursor. The mixture transferred reactor take full advantage of the synergistic interaction between both organic compounds LFPin/C. For comparison, properties ex-situ synthesized LFPex/C composite, obtained by addition TA after step, were evaluated. Results comparative experiments show that method is capable improve homogeneity dispersity residual combination with calcination at 600 °C 3 h. Cyclic voltammetry electrochemical impedance spectroscopy showed generated matrix embedded LiFePO4 particles can reduce charge transfer resistance. LFPin/C features large specific surface area 22.3 m2 g−1 uniform particle size distribution typical range 20–40 nm. In line these advantages, yields excellent cycle stability initial discharge capacities 166.1, 140 104 mAh g−1 at rates 0.1 C, 2 C 10 C, respectively.