Abstract: The invention provides novel non-aqueous electrolyte compositions comprising: a) one or more sodium-containing compounds; and b) a solvent system which comprises: i) a first solvent component which comprises one or more organo carbonate-based solvents; and ii) a second solvent component which comprises one or more surfactants in an amount of >0.5 to ?10% by weight of the solvent system.

Abstract: The invention relates to a sodium-ion secondary cell comprising a cathode and an anode, wherein the cathode comprises one or more cathode electrode active materials which include at least one layered nickel-containing sodium oxide material, and the anode comprises a layer of anode electrode active material disposed on an anode substrate; where in the layer of anode electrode active material comprises at least one disordered carbon material, and the mass of the layer of anode electrode active material per square metre of the anode substrate is less than 80 gm?2-; further wherein the ratio of the mass of the cathode electrode active material to the mass of the layer of anode electrode active material is from 0.1 to 10, and wherein the thickness of the layer of anode electrode active material on the anode substrate is less than 100 ?m.

Abstract: Disclosed herein is a non-flammable sodium-ion battery having a cathode and an anode and which uses an electrolyte that includes NaBF4 and a glyme solvent, where the battery has an average voltage of from 1.5 V to 6.0 V and has a coulombic efficiency after 5 charge/discharge cycles of at least 90%.

Abstract: The present invention relates to an electrode material for a sodium-ion battery, in particular, the present invention relates to an electrode material suitable for use as an anode of a sodium-ion battery wherein the electrode material comprises sodium titanate. In an aspect of the present invention, the electrode material comprises a sodium titanate having the formula Na3+xTi3O7, wherein the value of x is defined as ?0.5?x?0.3, wherein said material is an intermediate phase between Na2Ti3O7 and Na3+xTi3O7.