The structure of pure LiFePO and Ni or V

Electrochemical tests were conducted with 2032 coin-type cells. The cathode electrodes were fabricated with active-material (70 wt%), carbon black (Super P and KS-4, 20 wt%) and polyvinylidene fluoride (PVDF, 10 wt%) which were mixed in a N-methyl-pyrrolidinone (NMP) solution and then coated onto Al foil by tape casting. The electrolyte 1 M LiPF6 was dissolved in a 1:1 mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC). A microporous polypropylene film (Celgard 2400) separator was wetted with the electrolyte and sandwiched between the cathode and the anode electrodes. Metallic lithium was used as the anode electrode. All Gefitinib were assembled in an argon-filled glove box. The charge–discharge curves and cycling performance of coin cells were conducted on an automatic charge–discharge unit (Acu Tech Systems, BAT-750B) between 2.0 V and 4.0 V cut-off voltages at different C rates at room temperature. Cyclic voltammetry (CV) was conducted at scanning rates of 0.05, 0.1, 0.2, 0.5, 1.0, 2.0, and 5.0 mV s−1 on a Jiehan 5000 Electrochemical workstation. Electrochemical impedance spectroscopy (EIS) was recorded under a Solartron 1287 Electrochemical Interface connected with a Solartron 1255B frequency response analyzer in a range of 106 to 1.0×10−2 Hz.