Faradion Limited

Sharp Kabushiki Kaisha Corporation

Sharp Corporation

Joshua Charles Treacher

Emma Kendrick

Jeremy Barker

Katherine Louise Smith

Chaou Choak Tan

A method of operating a rechargeable sodium ion cell, wherein the cell comprises an anode material which is a disordered carbon and a nickel-containing sodium oxide cathode material comprises: in a formation charge phase, charging the cell to a first voltage at which sodium is irreversibly liberated from the cathode material; and in a subsequent charge-discharge cycle, charging the cell to a second voltage lower than the first voltage. The voltage to which the cell is charged in the formation charge phase may be selected such that the amount of sodium irreversibly liberated from the cathode material in the formation charge phase substantially equals the amount of sodium deposited in a surface electrolyte layer on the anode in the formation charge phase.

Formation method for sodium ion cell or battery

The present invention is directed to an electrode comprising one or more sodium-containing transition metal silicate compounds of the formula: AMMXOwherein A comprises sodium or a mixture of sodium with lithium and/or potassium Mcomprises one or more transition metals, wherein Mis capable of undergoing oxidation to a higher oxidation state, Mcomprises one or more non transition metals and/or metalloids, X comprises at least 40 mol % silicon, a is &#x3e;0, b is &#x3e;0 c is &#x2265;0, d is &#x2265;1, e is &#x2265;2, wherein the values of a, b, c, d, and e are selected to maintain the electroneutrality of the compound; and further wherein the one or more sodium-containing transition metal silicate compounds does not include NaMnSiO.

Sodium transition metal silicates

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Oxford, United Kingdom

Joshua Charles Treacher