#Fujitsu develops new Li iron pyrophosphate cathode material with abnormally high voltage for #LIBs
Half-cell assembling was conducted in a dry room (dew point: <-70°C). The mixture of the cathode materials, Ketjen Black and polyvinylidene difluoride in a ratio of 85:10:5 wt% was dispersed in N-methylpyrrolidone. The resulting paste was coated on Al sheet, and then dried in vacuum at 40 °C to evaporate the solvent. The Al sheet was cut out in disks (φ =16 mm), pressed under 9.5 MPa, and then dried in vacuum at 120°C overnight. 2032-type cells were assembled using the cathode sheets mentioned above as a positive electrode, Li metal disks (φ =16 mm) as a negative electrode, 1M LiPF6 solution in a 3:7 v/v mixture of ethylene carbonate/dimethyl carbonate as the electrolyte, and polypropylene separator (φ =18 mm). Galvanostatic charge and discharge measurements were carried out in CC mode (6.95 mA per 1 g of the cathode material). The voltage range was set to 2.0-4.5 V.