A positive electrode active material for nonaqueous electrolyte secondary batteries according to one embodiment of the present disclosure contains a lithium transition metal composite oxide which is represented by general formula Li.sub.aNi.sub.bCo.sub.cAl.sub.dX.sub.eO.sub.f (wherein 0.9≤a≤1.2; 0.88≤b≤0.96; 0≤c≤0.12; 0≤d≤0.12; 0≤e≤0.1; 1.9≤f≤2.1; (b+c+d)=1; and X represents at least one element that is selected from among Mn, Mg, Ca, Sr, Ba, Ti, Zr, V, Nb, Ta, Mo, W and B); and the lithium transition metal composite oxide has a pore volume of pores having a pore diameter of 0.3 μm or less of from 6×10.sup.−4 mL/g to 50×10.sup.−4 mL/g, while having a particle fracture strength of 120 MPa or more at the volume average particle diameter.

A supported catalyst for decomposing an organic substance that includes a carrier and catalyst particles supported on the carrier. The catalyst particles contain a perovskite-type composite oxide represented by A.sub.xB.sub.yM.sub.zO.sub.w, where A contains at least one of Ba and Sr, B contains Zr, M is at least one of Mn, Co, Ni, and Fe, y+z=1, x>1, z<0.4, and w is a positive value that satisfies electrical neutrality. An organic substance decomposition rate after the supported catalyst is subjected to a heat treatment at 950° C. for 48 hours is greater than 0.97 when the organic substance decomposition rate before the heat treatment is regarded as 1, and an amount of the catalyst particles peeled off when the supported catalyst is ultrasonicated in water at 28 kHz and 220 W for 15 minutes is less than 1 wt % of the catalyst particles before untrasonication.

Provided is a 5 V class spinel type lithium nickel manganese-containing composite oxide having an operating potential of 4.5 V or more with respect to a metal Li reference potential, wherein the composite oxide is able to improve cycle characteristics while suppressing the amount of gas generated under high temperature environments and, moreover, to improve output characteristics while suppressing a shoulder on discharge at around 4.1 V in a charge and discharge curve. The spinel type lithium nickel manganese-containing composite oxide is represented by a general formula [Li(Li.sub.aNi.sub.yMn.sub.xTi.sub.bMg.sub.zM.sub.α)O.sub.4-δ] (where 0<a, 0<b, 0.30≤y<0.60, 0<z, 0≤α, x=2−a−b−y−z−α<1.7, 3≤b/a≤8, 0.11<b+z+α, 0<z/b<1, 0≤δ≤0.2, and M represents one or two or more elements selected from the group consisting of Fe, Co, Ba, Cr, W, Mo, Y, Zr, Nb, P, and Ce).

An organic matter decomposition catalyst that contains a perovskite type complex oxide represented by A.sub.xB.sub.yM.sub.zO.sub.w, wherein A contains 90 at % or more of at least one element selected from the group consisting of Ba and Sr, B contains 80 at % or more of Zr, M is at least one element selected from the group consisting of Mn, Co, Ni, and Fe, y+z=1, x>1, z<0.4, and w is a positive value that satisfies electrical neutrality.

The present invention is related to a process for making an electrode active material wherein said process comprises the following steps: (a) Providing a hydroxide TM(OH).sub.2 or at least one oxide TMO or at least one oxyhydroxide of TM or a combination of at least two of the foregoing wherein TM is one or more metals and contains at least 97 mol-% Ni and, optionally, in total up to 3 mol-% of at least one metal selected from Al, Ti, Zr, V, Co, Zn, Ba, and Mn; (b) mixing said hydroxide TM(OH).sub.2 or oxide TMO or oxyhydroxide of TM or combination with a source of lithium and a source of Mg wherein the molar amount of (Li+Mg) corresponds to 75 to 95 mol-% of TM; (c) treating the mixture obtained from step (b) thermally at a temperature in the range of from 450 to 650° C., thereby obtaining an intermediate; (d) mixing the intermediate from step (c) with a source of Li and with at least one compound of a metal M.sup.1 selected from Al, Zr, Co, Mn, Nb, Ta, Mo, and W; (e) treating the mixture obtained from step (d) thermally at a temperature in the range of from 500 to 850° C.

The present invention discloses a cathode material for a sodium ion battery and a preparation method and application thereof. The cathode material has a general chemical formula of Na.sub.1+aNi.sub.1−x−y−zMn.sub.xFe.sub.yA.sub.zO.sub.2, where −0.40≤a≤0.25, 0.08<x<0.5, 0.05<y<0.5, 0.0<z<0.26. A is selected from one of or a combination of two or more of Ti, Zn, Co, Al, Zr, Y, Ca, Li, Rb, Cs, W, Ce, Mo, Ba, Mg, Ta, Nb, V, Sc, Sr, B and Cu. Here, in the cathode material for the sodium ion battery, at least two diffraction peaks exist when a diffraction angle 2θ is 42°-46°. The diffraction angle 2θ values of the two diffraction peaks are respectively around 43° and around 45°. The present invention increases the discharge capacity of the sodium ion battery by controlling the structure of the cathode material of the sodium ion battery to reduce the residual alkali content of the cathode material.

A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte, in which the positive electrode includes a positive electrode active material, the positive electrode active material includes a lithium-transition metal composite oxide containing Ni, Mn, and Al, proportions of Ni, Mn, and Al in metal elements other than Li contained in the lithium-transition metal composite oxide are, respectively, Ni: 50 atm % or more, Mn: 10 atm % or less, and Al: 10 atm % or less, when the lithium-transition metal composite oxide contains Co, a content of Co in the metal elements other than Li is 1.5 atm % or less, and the non-aqueous electrolyte includes a fluorosulfonic acid salt.

A positive electrode active material that is stable in a high potential state or a high temperature state and a highly safe secondary battery are provided. The positive electrode includes a first material and a second material and includes a region where at least part of a surface of the first material is covered with the second material. The first material includes a lithium cobalt oxide containing magnesium, fluorine, aluminum, and nickel. The second material includes a composite oxide (containing one or more selected from Fe, Ni, Co, and Mn) having an olivine crystal structure.

Disclosed is a lithium complex oxide and method of manufacturing the same, more particularly, a lithium complex oxide effective in improving the characteristics of capacity, resistance, and lifetime with reduced residual lithium and with different interplanar distances of crystalline structure between a primary particle locating in an internal part of secondary particle and a primary particle locating on the surface part of the secondary particle, and a method of preparing the same.

The presently disclosed subject matter is directed to a positive electrode active material for a non-aqueous electrolyte secondary battery including a lithium transition metal-containing composite oxide, comprising secondary particles formed by aggregates of primary particles. The secondary particles comprise: an outer-shell section formed by an aggregate of the primary particles; at least one aggregate section formed by an aggregate of primary particles and existing on an inside of the outer-shell section, and electrically and structurally connected to the outer-shell section; and at least one space section existing on the inside of the outer-shell section and in which there are no primary particles. The average particle size of the secondary particles being within the range 1 μm to 15 μm, an index [(d90-d10)/average particle size] that indicates a spread of a particle size distribution of the secondary particles being 0.7 or less, and the surface area per unit volume being 1.7 m.sup.2/cm.sup.3 or greater.