Properties of LiCoPO4-non-graphitic carbon foam composites

The properties of LiCoPO4-non-graphitic carbon foams (LCP-NGCF) composites are reported. The composites are treated at 300 degrees C for different times (t, from 0 to 12 h) in air, then at 730 degrees C for 12h in nitrogen. The diffraction analysis revealed LiCoPO4 as major crystalline phase, Li4P2O7 and Co2P (t=0h), Co2P (t> 0h) as secondary phases. The morphology consists of crystalline islands with spongy-like features on the surface (for t=0h) and with acicular crystallites of different dimensions (2-20 mu m) for t >= 0.1 h. The voltammetric curves show reduction potential values between 4.40 V and 4.60 V. The LCP-NGCF composites deliver a discharge specific capacity of 100 mAh g(-1) (t=0h, discharge rate of C/25 and RT) and of 65 mAh g(-1) (t>0h). The ac-impedance analysis reveal the formation of SET-layer after high annealing times, which disfavors the kinetics of the Li-(de)intercalation processes. (C) 2013 Elsevier Ltd. All rights reserved.