Abstract
Polycrystalline powders of LiNi 1− x Co x O 2 and LiNi 1− x− y Co xAl y O 2 were synthesized at 720 °C from the nitrate-PVA precursor method. The water was removed by two different processes: (i) evaporation-drying at 110 °C, (ii) spray-drying at 150 °C. In both cases a gel is obtained wherein LiNO 3 crystallizes in evaporated–dried samples but not in spray–dried samples which are more amorphous. All precursors give single phase powders with micronic well-shaped grains. The best electrochemical performances are obtained from evaporated samples with a capacity remaining higher than 160 mAh/g for LiNi 0.82Co 0.18O 2 and 140 mAh/g for LiNi 0.82Co 0.13Al 0.05O 2 after 20 cycles. The lower performances of the spray-dried samples seem to be related to Li 2CO 3 formation with subsequent non-stoichiometry as a consequence of the improved homogeneous distribution of the constituent cations in the polymer.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
