Importance

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Abstract

A phosphate based compound basically comprising —A: exchangeable cations used in charging and discharging, e.g. Li, Na, K, Ag, —B: non-exchangeable cations from the transition metals, group 3-12 of the periodic table of elements, e.g. Fe, Mn, Co, Cr, Ti, V, Cu, Sc, —C: 60 Mol-%-90 Mol-%, preferably 75 Mol-% of the compound being phosphate (PO₄)³⁻ anions, where oxygen is or may be partially substituted by a halide (e.g. F, Cl) and/or OH⁻ to a maximum concentration of 10 Mol-% of the oxygen of the anions and wherein said (PO₄)³⁻ coordination polyhedra may be partially substituted by one or more of: SiO₄⁴ silicate, BO₃³⁻ borate, CO₃²⁻ carbonate, H₂O water up to a maximum amount of <31 Mol-% of the anions, said compound being in crystalline form and having open elongate channels extending through the unit cell of the structure and with the compound being present either in single crystal form or as an anisotropic microcrystalline or nanocrystalline material. The phosphate based compound is used as an electroactive material, for example as a cathode, an anode or a separator in an ion battery or electrochemical storage device or electrochemical cell.

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First Claim