Sumitomo Chemical Company, Limited

Tanaka Chemical Corporation

Kenji Takamori

Yuichiro Imanari

Takashi Arimura

Yusuke Maeda

Daisuke Yamashita

Hiroyuki Kurita

Cedric Pitteloud

Kimiyasu Nakao

Tetsuri Nakayama

Hiroshi Inukai

Kyousuke Doumae

Jun-Ichi Kageura

Yasutaka Iida

Yuichi Sato

Takaaki Masukawa

Taiga Obayashi

Kenji Nakane

Satoshi Shimano

Jun-ichi Kageura

Maiko Saka

Hiroyuki Ito

Takashi Kitamoto

This lithium-containing transition metal composite oxide includes secondary particles that are aggregates of primary particles into or from which lithium ions are dopable or dedopable, and satisfies the following conditions:

Lithium-containing transition metal composite oxide, positive electrode active material for lithium secondary battery, positive electrode for lithium secondary battery, lithium secondary battery, and method for manufacturing lithium-containing transition metal composite oxide

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 &#x3b1;-NaFeOtype crystal structure of following formula (A):Li(NiCoM)O&#x2003;&#x2003;(A)wherein 0.9&#x2264;a&#x2264;1.2, 0.9&#x2264;b&#x3c;1, 0&#x3c;c&#x2264;0.1, 0.9&#x3c;b+c&#x2264;1, and Mrepresents 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, wherein Mrepresents 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 &#x3bc;m, a BET specific surface area of 0.1 to 2.5 m/g, and a value of 1.0 to 2.0 as a tamped density/untamped density ratio of the active material.

Positive electrode active material for lithium secondary batteries, positive electrode for lithium secondary batteries, and lithium secondary battery

A positive electrode active material for lithium secondary batteries includes a lithium composite metal compound containing secondary particles that are aggregates of primary particles which are capable of being doped or dedoped with lithium ions and satisfies all of specific requirements (1) to (4).

Lithium nickel cobalt composite oxide positive active material, positive electrode, and lithium secondary battery using the same

A positive electrode active material for lithium secondary batteries which is able to doped/undoped with lithium ions and contains at least Ni, in which a ratio P/Q (atom %/mass %) of a concentration P (atom %) of sulfur atoms being present in a surface of the positive electrode active material to a concentration Q (mass %) of sulfuric acid radicals being present in the whole positive electrode active material is more than 0.8 and less than 5.0, and the Q (mass %) is 0.01 or more and 2.0 or less.

Positive electrode active material for lithium secondary batteries, method of producing positive electrode active material for lithium secondary batteries, positive electrode for lithium secondary batteries, and lithium secondary battery

The present invention relates to a positive electrode active material for a lithium secondary battery, including a lithium composite metal oxide in a form of secondary particles formed by aggregation of primary particles, wherein the secondary particles have voids in interior thereof and a number of the voids with cross section thereof present per 1 &#x3bc;mof cross section of the secondary particles is 0.3 or more and 15 or less.

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 &#x3bc;m to 1 &#x3bc;m, and a 50% cumulative particle size Dof 1 &#x3bc;m to 10 &#x3bc;m, (2) a ratio (D/D) of volume-based 90% cumulative particle size Dto volume-based 10% cumulative particle size Dof 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 &#x3b1;/crystallite size &#x3b2; ratio (&#x3b1;/&#x3b2;) of 1 to 1.75 or less, wherein the crystallite size &#x3b1; is within a peak region of 2&#x3b8;=18.7&#xb1;1&#xb0; and the crystallite size &#x3b2; is within a peak region of 2&#x3b8;=44.6&#xb1;1&#xb0;, each determined by a powder X-ray diffraction measurement using Cu-K&#x3b1; ray, and has a composition represented by formula (I) below:Li[Li(NiCoMnM)]O&#x2003;&#x2003;(I)wherein 0&#x2264;x&#x2264;0.2, 0.3&#x3c;a&#x3c;0.7, 0&#x3c;b&#x3c;0.4, 0&#x3c;c&#x3c;0.4, 0&#x2264;d&#x3c;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.

Positive electrode active material for lithium secondary battery, positive electrode for lithium secondary battery, and lithium secondary battery

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 &#x3bc;m to 1 &#x3bc;m and a secondary particle size is 1 &#x3bc;m to 10 &#x3bc;m; (2) in an X-ray powder diffraction measurement using CuK&#x3b1; radiation, a crystallite size in the peak within 2&#x3b8;=18.7&#xb1;1&#xb0; is 100 &#x212b; to 1200 &#x212b; and a crystallite size in the peak within 2&#x3b8;=44.6&#xb1;1&#xb0; is 100 &#x212b; to 700 &#x212b;; 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/g to 0.05 cm/g.

Positive electrode active material for lithium secondary battery, positive electrode, and secondary battery

Provided are a transition metal mixed hydroxide comprising an alkali metal other than Li, SOand a transition metal element, wherein the molar ratio of the molar content of the alkali metal to the molar content of the SOis not less than 0.05 and less than 2, and a lithium mixed metal oxide obtained by calcining a mixture of the transition metal mixed hydroxide and a lithium compound by maintaining the mixture at a temperature of 650 to 1000&#xb0; C.

Transition metal composite hydroxide and lithium composite metal oxide

The present invention provides a method of producing a lithium mixed metal oxide, a lithium mixed metal oxide and a nonaqueous electrolyte secondary battery. The method includes a step of calcining a mixture of one or more compounds of M wherein M is one or more elements selected from the group consisting of nickel, cobalt and manganese, and a lithium compound, in the presence of one or more inactive fluxes selected from the group consisting of a fluoride of A, a chloride of A, a carbonate of A, a sulfate of A, a nitrate of A, a phosphate of A, a hydroxide of A, a molybdate of A and a tungstate of A, wherein A is one or more elements selected from the group consisting of Na, K, Rb, Cs, Ca, Mg, Sr and Ba. The lithium mixed metal oxide contains nickel, cobalt and manganese, has a BET specific surface area of from 3 m/g to 15 m/g, and has an average particle diameter within a range of 0.1 &#x3bc;m or more to less than 1 &#x3bc;m, the diameter determined by a laser diffraction scattering method.

Method for producing lithium composite metal oxide, lithium composite metal oxide, and nonaqueous electrolyte secondary battery

A lithium composite metal oxide that contains Li, Ni, and Mn, has a layered structure, has a diffraction peak in a range of 2&#x3b8;=20.8&#xb1;1&#xb0; in a powder X-ray diffraction pattern obtained with powder X-ray diffraction measurement using a Cu&#x2014;K&#x3b1; radiation, has a BET specific surface area in a range of 6 m/g to 30 m/g, and has an average particle diameter measured with a laser diffraction scattering method in a range of 0.1 &#x3bc;m to 10 &#x3bc;m.

Lithium composite metal oxide, positive electrode active substance, positive electrode, and non-aqueous electrolyte secondary battery

The present invention provides a positive electrode active material. The positive electrode active material is represented by the following formula (I) and has a BET specific surface area of larger than 5 m/g and not larger than 15 m/g:LiMMO&#x2003;&#x2003;(I)wherein Mis at least one transition metal element selected from Group 5 elements and Group 6 elements of the Periodic Table, Mis at least one transition metal element other than Mand selected from among transition metal elements excluding Fe, x is not less than 0.9 and not more than 1.3, and y is more than 0 and less than 1.

Positive electrode active material

A lithium mixed metal oxide, shown by the following formula (A):Lix(Mn1&#x2212;y&#x2212;z&#x2212;dNiyFezMd)O2&#x2003;&#x2003;(A)wherein M is one or more elements selected from the group consisting of Al, Mg, Ti, Ca, Cu, Zn, Co, Cr, Mo, Si, Sn, Nb and V; x is 0.9 or more and 1.3 or less; y is 0.3 or more and 0.7 or less; z is more than 0 and 0.1 or less, and d is more than 0 and 0.1 or less. A positive electrode active material, including the lithium mixed metal oxide. A positive electrode, including the positive electrode active material. A nonaqueous electrolyte secondary battery, including the positive electrode.

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Tsukuba, Japan

Kenji Takamori