Article abstract
Nature Materials 4, 254 - 260 (2005)
doi:10.1038/nmat1335
Subject Categories: Electronic materials | Materials for energy
The existence of a temperature-driven solid solution in LixFePO4 for 0 
x 1
Charles Delacourt1, Philippe Poizot1, Jean-Marie Tarascon1 and Christian Masquelier1
Abstract
Lithium-ion batteries have revolutionized the powering of portable electronics. Electrode reactions in these electrochemical systems are based on reversible insertion/deinsertion of Li+ ions into the host electrode material with a concomitant addition/removal of electrons into the host. If such batteries are to find a wider market such as the automotive industry, less expensive positive electrode materials will be required, among which LiFePO4 is a leading contender. An intriguing fundamental problem is to understand the fast electrochemical response from the poorly electronic conducting two-phase LiFePO4/FePO4 system. In contrast to the well-documented two-phase nature of this system at room temperature, we give the first experimental evidence of a solid solution LixFePO4 (0 x 1) at 450 °C, and two new metastable phases at room temperature with Li0.75FePO4 and Li0.5FePO4 composition. These experimental findings challenge theorists to improve predictive models commonly used in the field. Our results may also lead to improved performances of these electrodes at elevated temperatures.
- Laboratoire de Réactivité et de Chimie des Solides, CNRS UMR 6007, Université de Picardie Jules Verne, 33 Rue St. Leu, 80039 Amiens Cedex 9, France
Correspondence to: Christian Masquelier1 e-mail: christian.masquelier@sc.u-picardie.fr
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