Sumitomo Chemical Company, Limited

Tanaka Chemical Corporation

Kyocera Document Solutions Inc.

Hiroyuki Kurita

Yuichiro Imanari

Daisuke Yamashita

Kenji Takamori

Jun-ichi Kageura

Kimiyasu Nakao

Takaaki Masukawa

Takeshi Sakaguchi

Eiji Mifune

Hiroyuki Ito

Yasutaka Iida

Shunji Miki

Koji Habata

Osamu Mine

Mari Kurimoto

Ryuma Kuroda

Yusuke Maeda

Takashi Arimura

Kyousuke Doumae

Kentaro Masui

Ryota Kobayashi

Shin Saito

Kayo Matsumoto

The present invention provides a positive electrode active material for lithium secondary batteries including: secondary particles obtained by aggregating primary particles capable of being doped and de-doped with lithium ions, in which the secondary particles have pores, and pore distribution obtained by a mercury intrusion method satisfies requirements (1) and (2) below:

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

A positive electrode active material for a lithium secondary battery, including secondary particles formed by aggregation of primary particles capable of being doped and undoped with lithium ions, said positive electrode active material having: an &#x3b1;-NaFeOtype crystal structure represented by formula: Li[Li(NiCoMnM)]O(I), wherein 0&#x2264;x&#x2264;0.1, 0.7&#x3c;a&#x3c;1, 0&#x3c;b&#x3c;0.2, 0&#x2264;c&#x3c;0.2, 0&#x3c;d&#x3c;0.1, a+b+c+d=1, and M is at least one metal element selected from the group consisting of Fe, Cr, Ti, Mg, Al, Zr, Ca, Sc, V, Cr, Cu, Zn, Ga, Ge, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In and Sn; and a crystallite size &#x3b1;/crystallite size &#x3b2; ratio (&#x3b1;/&#x3b2;) of 1.60 to 2.40, 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;=44.4&#xb1;1&#xb0;, each determined by a powder X-ray diffraction measurement using Cu-K&#x3b1; radiation.

A positive electrode active material for lithium secondary batteries, includes: a lithium composite metal compound containing secondary particles formed by aggregation of primary particles; and a lithium-containing tungsten oxide, in which the lithium-containing tungsten oxide is present at least in interparticle spaces of the primary particles, and in a pore distribution of the positive electrode active material for lithium secondary batteries measured by a mercury intrusion method, a surface area of pores having a pore diameter in a range of 10 nm or more to 200 nm or less is 0.4 m/g or more and 3.0 m/g 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 for a lithium secondary cell, having a layered structure and comprising at least nickel, cobalt and manganese, the positive electrode active material satisfying requirements (1), (2) and (3) below: (1) a composition represented by a composition formula: Li[Li(NiCoMnM)]O, wherein 0&#x2264;x&#x2264;0.10, 0.30&#x3c;&#x3b1;&#x2264;0.34, 0.30&#x3c;&#x3b2;&#x2264;0.34, 0.32&#x2264;&#x3b3;&#x3c;0.40, 0&#x2264;&#x3b4;&#x2264;0.10, &#x3b2;&#x3c;&#x3b3;, &#x3b4;+&#x3b1;+&#x3b2;+&#x3b3;=1, M represents at least one metal selected from the group consisting of Fe, Cu, Ti, Mg, Al, W, Zn, Sn, Zr, Ga and V; (2) a secondary particle diameter of 2 &#x3bc;m or more and 10 &#x3bc;m or less; and (3) a maximum peak value in a pore diameter range of 90 nm to 150 nm in a pore diameter distribution determined by mercury porosimetry.

Positive-electrode active material for lithium secondary cell, positive electrode for lithium secondary cell, and lithium secondary cell

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

A mark detection apparatus includes a reading unit, a converter, and a determination part. The reading unit reads an image on a document. The converter compares respective portions of the image read by the reading unit with a plurality of preset reference patterns, and converts a portion of the image to a character associated with a corresponding reference pattern. The determination part determines that the portion of the image to have been compared on the document is a mark in a case in which the character converted by the converter is a preset first reference character, and that the portion of the image to have been compared on the document is not a mark in a case in which the character converted by the converter is not a preset first reference character.

Mark detection apparatus and method for detecting mark

A process for producing a polymer electrolyte emulsion having the following steps (1) and (2) is provided. Step (1): a step of dissolving a polymer electrolyte in a solvent comprising a good solvent for the polymer electrolyte to prepare a polymer electrolyte solution having a polymer electrolyte concentration of 0.1 to 10% by weight. Step (2): a step of mixing the polymer electrolyte solution 10 obtained in the step (1), and a poor solvent for the polymer electrolyte at a ratio of 4 to 99 parts by weight of the poor solvent based on 1 part by weight of the polymer electrolyte solution. In addition, a process for producing a polymer 15 electrolyte emulsion comprising separating a polymer electrolyte dispersion in which a polymer electrolyte particle is dispersed in a dispersing medium, with a membrane is provided.

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Osaka, Japan

Hiroyuki Kurita