Tanaka Chemical Corporation

Fukui, Japan

Tanaka Chemical Corporation

Fukui, Japan
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The object of the present invention is to provide a positive electrode active material usable for a lithium ion battery capable of high charge/discharge cycle performance and high discharge capacity. The positive electrode active material for a lithium secondary battery has a layered structure and comprises at least nickel, cobalt and manganese. Further, the positive electrode active material satisfies requirements (1) to (3) below: (1) a primary particle size of 0.1 m to 1m, and a 50 % cumulative particle size D_(50) of 1 m to 10 m, (2) a ratio (D_(90)/D_(10)) of volume-based 90% cumulative particle size D_(90) to volume-based 10% cumulative particle size D_(10) of 2 to 6, and (3) a lithium carbonate content in a residual alkali on particle surfaces of 0.1 % by mass to 0.8 % by mass as measured by neutralization titration.


The object of the present invention is to provide a positive electrode active material usable for a lithium ion battery capable of high charge/discharge cycle performance and high discharge capacity. The positive electrode active material for a lithium secondary battery has a layered structure and comprises at least nickel, cobalt and manganese. Further, the positive electrode active material satisfies requirements (1) to (3) below: (1) a primary particle size of 0.1 m to 1 m, and a 50% cumulative particle size D_(50 )of 1 m to 10 m, (2) a ratio (D_(90)/D_(10)) of volume-based 90% cumulative particle size D_(50 )to volume-based 10% cumulative particle size D_(10 )of 2 to 6, and (3) a lithium carbonate content in a residual alkali on particle surfaces of 0.1% by mass to 0.8% by mass as measured by neutralization titration.


A positive electrode active material, which has a crystallite size /crystallite size ratio (/) of 1 to 1.75 or less, wherein the crystallite size is within a peak region of 2 = 18.7 1 and the crystallite size is within a peak region of 2 = 44.6 1, each determined by a powder X-ray diffraction measurement using Cu-K ray, and has a composition represented by formula (I) below:Li[Li_(x)(Ni_(a)Co_(b)Mn_(c)M_(d))_(1-x)]O_(2)(I)wherein 0 x 0.2, 0.3 < a < 0.7, 0 < b < 0.4, 0 < c < 0.4, 0 d < 0. 1, a + b + c + d = 1, and M is at least one metal selected from the group consisting of Fe, Cr, Ti, Mg, Al and Zr.


Patent
NEC Corp and Tanaka Chemical Corporation | Date: 2014-08-19

There is provided a lithium-iron-manganese-based composite oxide capable of providing a lithium-ion secondary battery which has a high capacity retention rate in charge/discharge cycles and in which the generation of a gas caused by charge/discharge cycles is reduced. A lithium-iron-manganese-based composite oxide having a layered rock-salt structure, wherein at least a part of the surface of a lithium-iron-manganese-based composite oxide represented by the following formula (1) is coated with an inorganic material: Li_(x)M^(1)_((y-p))Mn_(p)M^(2)_((z-p))Fe_(q)O_((2-) )(1) (wherein 1.05x1.32, 0.33y0.63, 0.06z0.50, 0


Patent
Tanaka Chemical Corporation and Sumitomo Chemical | Date: 2016-05-18

Provided is a positive electrode active material which is useful for a lithium secondary battery having a battery resistance lower than that of the conventional positive electrode active material below freezing point. The positive electrode active material for a lithium secondary battery contains at least one element selected from a group consisting of nickel, cobalt and manganese, the positive electrode active material having a layered structure and satisfying all of the following requirements (1) to (3): (1) a primary particle size is 0.1 m to 1 m and a secondary particle size is 1 m to 10 m; (2) in an X-ray powder diffraction measurement using CuK radiation, a crystallite size in the peak within 2 = 18.7 1 is 100 to 1200 and a crystallite size in the peak within 2 = 44.6 1 is 100 to 700 ; and (3) in a pore distribution obtained by a mercury intrusion method, a pore peak exists in a range where the pore size is 10 nm to 200 nm and a pore volume in the said range is 0.01 cm^(3)/g to 0.05 cm^(3)/g.


A positive electrode active material for a lithium secondary battery, comprising a lithium-containing composite metal oxide in the form of secondary particles formed by aggregation of primary particles capable of being doped and undoped with lithium ions, each of the secondary particles having on its surface a coating layer, the positive electrode active material satisfying the following requirements (1) to (3): (1) the metal oxide has an -NaFeO_(2 )type crystal structure of following formula (A): Li_(a)(Ni_(b)Co_(c)M^(1)_(1-b-c))O_(2)(A) wherein 0.9a1.2, 0.9b<1, 0


The present invention relates to a nickel oxide-stabilized zirconia composite in which nickel oxide is dispersed uniformly, a process for readily producing the composite oxide, and an anode for a solid oxide fuel cell having excellent output characteristics. More specifically, the present invention provides a nickel oxide-stabilized zirconia composite that is produced by sintering a mixture of nickel hydroxide and/or nickel carbonate and a hydroxide of stabilized zirconium.


Patent
Tanaka Chemical Corporation | Date: 2012-09-26

A lithium-rich lithium metal complex oxide contains at least 50 mol % of Mn with respect to a total amount of metals other than lithium, and at least one other metal. The lithium metal complex oxide has a tapped density in a range of 1.0 g/ml to 2.0 g/ml.


Patent
Tanaka Chemical Corporation and Sumitomo Chemical | Date: 2014-07-01

Provided is a positive electrode active material which is useful for a lithium secondary battery having a battery resistance lower than that of the conventional positive electrode active material below freezing point. The positive electrode active material for a lithium secondary battery contains at least one element selected from a group consisting of nickel, cobalt and manganese, the positive electrode active material having a layered structure and satisfying all of the following requirements (1) to (3): (1) a primary particle size is 0.1 m to 1 m and a secondary particle size is 1 m to 10 m; (2) in an X-ray powder diffraction measurement using CuK radiation, a crystallite size in the peak within 2=18.71 is 100 to 1200 and a crystallite size in the peak within 2=44.61 is 100 to 700 ; and (3) in a pore distribution obtained by a mercury intrusion method, a pore peak exists in a range where the pore size is 10 nm to 200 nm and a pore volume in the said range is 0.01 cm^(3)/g to 0.05 cm^(3)/g.


A positive electrode active material for a lithium secondary battery, comprising a lithium-containing composite metal oxide in the form of secondary particles formed by aggregation of primary particles capable of being doped and undoped with lithium ions, each of the secondary particles having on its surface a coating layer, the positive electrode active material satisfying the following requirements (1) to (3):(1) the metal oxide has an -NaFeO_(2) type crystal structure of following formula (A):Li_(a)(Ni_(b)Co_(c)M^(1)_(1-b-c))O_(2)(A)wherein 0.9 a 1.2, 0.9 b < 1, 0 < c 0.1, 0.9 < b + c 1, and M^(1) represents at least one optional metal selected from Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In and Sn;(2) the coating layer comprises Li and M^(2), wherein M^(2) represents at least one optional metal selected from Al, Ti, Zr and W; and(3) the active material has an average secondary particle diameter of 2 to 20 m, a BET specific surface area of 0.1 to 2.5 m^(2)/g, and a value of 1.0 to 2.0 as a tamped density/untamped density ratio of the active material.

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