Tungsten doped multi-ionic cathode

A process for preparation of the cathode active material of Formula (I) comprising;

• i. Preparing separate solutions of the base metal C, D & E in their respective stoichiometric ratios, and the second solution of a mixture of 1% or 2% or 5% Tungstic acid dissolved in both NaOH and NH4OH solutions, wherein the second solution is further kept for vigorous stirring under an N2 atmosphere;
• ii. Mixing the above two solutions simultaneously drop wise into a fixed volume stirred reactor followed by aging (maturing) for a period of 12 hrs, under the stirring condition to allow homogenous particle formation, which is then washed, neutralized, and dried to form the ternary hydroxides;
• iii. Intimately mixing the obtained ternary hydroxides of step (ii) with stoichiometric quantities of A and B salts;
• iv. Heating the resulting mixture in a furnace under a suitable atmosphere over a temperature range of 450° C. to 900° C. until reaction product forms;
• and
• v. Allowing the product to cool before grinding it to a powder.

A alkali-ion electrochemical cell comprising;

• i. the cathode consisting of tungsten doped mixed cation active material of the formula (I);
• wherein,
• ‘A’ comprises one or more alkali metal selected from Sodium, Lithium, Potassium and the like;
• ‘B’ comprises one or more alkali metal selected from Sodium, Lithium, Potassium and the like;
• M1 is the transition metal in the oxidation state +2;
• M2 is the transition metal in the oxidation state +3;
• M3 is the transition metal in the oxidation state +4;
• W is tungsten in oxidation state +3;
• Wherein
• 0.67≤a≤1, preferably 0.85≤a≤1, further preferably 0.95≤a≤1,
• 0.01≤b≤0.25, preferably 0.01≤b≤0.1, further preferably 0.01≤b≤0.05;
• 0≤c≤0.5, preferably 0≤c≤0.45, further preferably 0≤c≤0.333;
• 0≤d≤0.5, preferably 0≤d≤0.45, further preferably 0≤d≤0.333;
• 0≤e≤0.5, preferably 0≤e≤0.45, further preferably 0≤e≤0.333;
• ii. an anode selected from graphite, hard carbon, and silicon;
• iii. a separator;
• and
• iv. a non-aqueous electrolyte comprising 0.8M NaPF6-PC:EMC:FEC:PST:DDT composition.