Cathode material for secondary battery, method for producing cathode material for secondary battery and secondary battery

A cathode material for a secondary battery, synthesized so as to contain a cathode active material represented by a general formula LinFePO4 (wherein 0<n≦1) as a primary component, one or more metal elements selected from the group consisting of vanadium (V), chromium (Cr), copper (Cu), zinc (Zn), indium (In), tin (Sn), molybdenum (Mo), and titanium (Ti), and a halogen element, by mixing a halide or halides of the metal element or elements with the ingredients of the cathode active material represented by the general formula LinFePO4, and then calcining the mixture, wherein the total content of the metal element or elements is in the range of 0.1 to 5 mol %, in terms of elemental ratio, based on iron in the cathode active material, and the halogen element is contained in an amount of 0.1 mol % or more based on P, wherein the upper limit of molar content of the halogen element is a molar concentration of twice that of the metal element or elements.

A method for producing a cathode material for a secondary battery, synthesized so as to contain a cathode active material represented by a general formula LinFePO4 (wherein 0<n≦1) as a primary component, one or more metal elements selected from the group consisting of vanadium (V), chromium (Cr), copper (Cu), zinc (Zn), indium (In), tin (Sn), molybdenum (Mo), and titanium (Ti), and a halogen element, the method comprising:

• mixing the ingredients of the cathode active material LinFePO4 with a halide of at least one of the metal elements to obtain a calcination precursor, and then calcining the calcination precursor to composite the cathode active material with the metal element or elements, wherein the total content of the metal element or elements is in the range of 0.1 to 5 mol %, in terms of elemental ratio, based on iron in the cathode active material, and the halogen element is contained in an amount of 0.1 mol % or more based on P, wherein the upper limit of molar content of the halogen element is a molar concentration of twice that of the metal element or elements.

A cathode material for a secondary battery containing a cathode active material represented by a general formula LinFePO4 (wherein 0<n≦1) as a primary component, one or more metal elements selected from the group consisting of vanadium (V), chromium (Cr), copper (Cu), zinc (Zn), indium (In), tin (Sn), molybdenum (Mo), and titanium (Ti), the total content of which metal element is in the range of 0.1 to 5 mol %, in terms of elemental ratio, based on iron in the cathode active material, and a halogen element in an amount of 0.1 mol % to 1.45 mol % based on P.

A cathode material for a secondary battery, synthesized so as to contain a cathode active material represented by a general formula LinFePO4 (wherein 0<n≦1) as a primary component, one or more metal elements selected from the group consisting of vanadium (V), chromium (Cr), copper (Cu), zinc (Zn), indium (In), tin (Sn), molybdenum (Mo), and titanium (Ti), and a halogen element, by mixing a halide or halides of the metal element or elements with the ingredients of the cathode active material represented by the general formula LinFePO4, and then calcining the mixture, wherein the total content of the metal element or elements is in the range of 0.1 to 5 mol %, in terms of elemental ratio, based on iron in the cathode active material, and the halogen element is contained in an amount of 0.1 mol % to 1.45 mol % based on P.

A method for producing a cathode material for a secondary battery, synthesized so as to contain a cathode active material represented by a general formula LinFePO4 (wherein 0<n≦1) as a primary component, one or more metal elements selected from the group consisting of vanadium (V), chromium (Cr), copper (Cu), zinc (Zn), indium (In), tin (Sn), molybdenum (Mo), and titanium (Ti), and a halogen element, the method comprising:

• mixing the ingredients of the cathode active material LinFePO4 with a halide of at least one of the metal elements to obtain a calcination precursor, and then calcining the calcination precursor to composite the cathode active material with the metal element or elements, wherein the total content of the metal element or elements is in the range of 0.1 to 5 mol %, in terms of elemental ratio, based on iron in the cathode active material, and the halogen element is contained in an amount of 0.1 mol % to 1.45 mol % based on P.