Cathode electroactive material, production method therefor, and nonaqueous secondary cell using the same

A cathode electroactive material comprising a composite oxide comprising β-MnO2 and a spinel oxide predominantly comprising lithium, manganese, and oxygen, which has pores of about 30-400 Å, wherein the β-MnO2 is comprised in the composite oxide in an amount of about 1-13 mol %.

A cathode electroactive material comprising a composite oxide comprising β-MnO2 and a spinel oxide predominantly comprising lithium, manganese, and oxygen, wherein the spinel oxide predominantly comprising lithium, manganese, and oxygen is LiMn2O4 formed of lithium, manganese, and oxygen;

• or a composite oxide Li1+xMn2−x−yMyO4 (wherein −0.1≦x≦0.2, and 0≦y≦0.2) in which a portion of Li or Mn in LiMn2O4 is replaced by a different element selected from the group consisting of chromium, cobalt, aluminum, nickel, iron, and magnesium, and which has pores of about 30-400 Å, wherein the β-MnO2 is comprised in the composite oxide in an amount of about 1-13 mol %.

A process for producing a cathode electroactive material comprising a composite oxide comprising β-MnO2 and a spinel oxide predominantly comprising lithium, manganese, and oxygen, wherein the composite oxide is a granule having a particle size of about 3-50 μm, which process comprises acid treatment of a composite oxide comprising a spinel oxide predominantly comprising lithium, manganese, and oxygen, and heat treatment of the resultant composite oxide at a temperature of about 200° C. or higher and lower than about 400° C.

A process for producing a cathode electroactive material comprising a composite oxide comprising β-MnO2 and a spinel oxide predominantly comprising lithium, manganese, and oxygen, which has pores of about 30-400Å, which process comprises acid treatment of a composite oxide comprising a spinel oxide predominantly comprising lithium, manganese, and oxygen, and heat treatment of the resultant composite oxide at a temperature of about 200° C. or higher and lower than about 400° C.

A process for producing a cathode electroactive material comprising a composite oxide comprising β-MnO2 and a spinel predominantly comprising lithium, manganese, and oxygen, wherein the spinel oxide predominantly comprising lithium, manganese, and oxygen is LiMn2O4 formed of lithium, manganese, and oxygen;

• or a composite oxide Li1+xMn2−x−yO4 (wherein −0.1≦x≦0.2, and 0≦y≦0.2) in which a portion of Li or Mn in LiMn2O4 is replaced by a different element selected from the group consisting of chromium, cobalt, aluminum, nickel, iron and magnesium, and wherein the composite oxide is a granule having a particle size of about 3-50 μm, which process comprises acid treatment of a composite oxide comprising a spinel oxide predominantly comprising lithium, manganese, and oxygen, and heat treatment of the resultant composite oxide at a temperature of about 200° C. or higher and lower than about 400° C.

A process for producing a cathode electroactive material comprising a composite oxide comprising β-MnO2 and a spinel oxide predominantly comprising lithium, manganese, and oxygen, wherein the spinel oxide predominantly comprising lithium, manganese, and oxygen is LiMn2O4 formed of lithium, manganese, and oxygen;

• or a composite oxide Li1+xMn2−x−yMyO4 (wherein −0.1≦x0.2, and 0y≦0.2) in which a portion of Li or Mn in LiMn2O4 is replaced by a different element selected from the group consisting of chromium, cobalt, aluminum, nickel, iron, and magnesium, and which has pores of about 30-400 Å, which process comprises acid treatment of a composite oxide comprising a spinel oxide predominantly comprising lithium, manganese, and oxygen, and heat treatment of the resultant composite oxide at a temperature of about 200° C. or higher and lower than about 400° C.