Spinel discharge/charge profiles

Figure 3 Ex situ XRD profiles of spinel-based electrodes after cycling or storage at ambient temperature. Dots Li Mn O reflections diamonds A1 current collector. (A) Discharged to 2.4 V (B) pristine LiMrr,0 (C) charged to 4.3 V (D) cycled 50 times at C/3 (E) stored for 300 h at OCV. Reproduced Irom [32] with permission of The Electrochemical Society Inc.

Fig. 6.18 Charge-discharge profiles of defect spinels (a) Lio.5MnO2.25 (Li2Mn409) and (b) Lio.51MnO2.2- Measurements were carried out at C/20 rate in the potential range 2-4 V...

Fig. 9.19 The voltage composition profile for a Li//LiMii204 using a spinel electrode synthesized by the combustion urea-assisted method. The cell was charged and discharged at current density 0.05 mA/cm ...

The product prepared by reactive milling for 5 h shows a rather disordered spinel structure as observed by Raman scattering spectroscopy (Fig. 9.21a). For this compound the Raman active Aig mode at 625 cm is shifted to 633 cm and broadened in comparison with that of a A-LiMn204 ceramic. This disordered structure is also at the origin of the electrochemical behavior shown in Fig. 9.21b. The first charge-discharge curve recorded at the C/10 rate shows deviation from the standard electrochemical profile of LiMn204 spinel. We do not observe the... 

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