On the way to the optimization of Li3Fe2(PO4)3 positive electrode materials

The electrochemical performances of the two polymorphs of Li3Fe2(PO4)(3) are reported. We show that reversible capacities as high as 110 mA h g(-1) at C/20 regime with an excellent capacity retention are obtained by playing with particle sizes and surface. Tailored made particles were done chemically, by developing a new low temperature synthetic route. In contrast, the modification of the particle surface was achieved by ball-milling of carbon/Li3Fe2(PO4)(3) mixtures, confirming again the positive attribute of such process regarding the electrochemical performances of transition metal phosphates. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.