CURRENT DEVELOPEMENTS ABOUT LIFEPO4 BATTERY FOR STATIONARY ENERGY STORAGE IN AFRICA

Abstract

Stationary energy storage is one of current and major challenge in the world. LiFePO4(LFP) batteries have been used more and more for several applications, stationary energy storage specifically.This technology of batteries is one of promising candidates for power lithium ion batteries due to their flat voltage profile, environmental benignity, cycling stability, and high theoretical capacity. However, the poor electronic conductivity and a low lithium ion diffusion coefficient of LiFePO4 cathode materials are the mains disadvantage which make the researchers to investigate on doping materials. This review summarize the main research which allow to improve electrochemical performance of the LiFePO4 batteries in context of stationary energy storage. The improvement of LiFePO4 batteries is mainly due to the cathode. Li-site doped with particular elements increase the width of the one-dimensional diffusion channels of lithium ions and decrease the charge transfer resistance, which resulted in a good electrochemical performance of doped LiFePO4. Fe-site doping enhance the electronic conductivity of LiFePO4 while O-site doped with proper ion improve the intrinsic conductivity and promote the redox potential of LiFePO4. Furthermore, multi-elements co-doping enhance the electrochemical performances ofLiFePO4cathodes.The more interesting doping are: LiFe0.975Zn0.025PO4,LiV0.069Ti0.025Fe0.905PO4and Li0.99La0.01Fe0.9Mg0.1PO4