Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Sanyo Electric Co., Ltd.

Panasonic Holdings Corporation

Matsushita Electric Industrial Co., Ltd.

Hidekazu Hiratsuka

Akihiro Maeda

Yasutaka Kogetsu

Kaoru Nagata

Tatsuhiko Suzuki

Tsutomu Nishioka

Norihiro Yamamoto

Takahiro Sakamoto

Yutaka Kawatate

Takaya Saito

Shigeru Hanaoka

Hiroshi Yoshizawa

Kensuke Nakura

Takashi Takeuchi

Yoshiyuki Ozaki

Jun Nunome

Shinji Arimoto

Hiroki Watanabe

Yuji Mototani

Kazunori Donoue

Hiroaki Furuta

Takuo Yoneda

Yoneda Takuo

A positive electrode active substance, wherein: the average primary particle diameter of an Ni-containing lithium complex oxide A is 0.5 μm or greater, and is greater than the average primary particle diameter (0.05 μm or greater) of an Ni-containing lithium complex oxide B; and the average secondary particle diameter of the Ni-containing lithium complex oxide A is 2-6 μm, and is less than the average secondary particle diameter (10-20 μm) of the Ni-containing lithium complex oxide B. The Ni-containing lithium complex oxides A, B contain 55 mol % or more of Ni relative to the total mol of metal elements excluding Li, have a crystallite diameter of 100-200 nm, and are such that the disorder of elemental Ni is 3% or less.

Positive electrode active substance for non-aqueous electrolyte secondary cell, and non-aqueous electrolyte secondary cell

A positive electrode active material for nonaqueous electrolyte secondary batteries includes a Ni-containing lithium transition metal oxide in the form of secondary particles formed by the aggregation of primary particles of the oxide, the proportion of Ni in the lithium transition metal oxide being not less than 80 mol % relative to the total number of moles of metal element(s) except Li, the average particle size of the primary particles being not less than 0.5 μm, the average particle size of the secondary particles being not less than 8 μm, the lithium transition metal oxide having a Ni disorder of not more than 3% and a crystallite size in the range of 100 to 200 nm according to X-ray diffractometry.

Positive electrode active material for nonaqueous electrolyte secondary batteries comprising nickel-containing lithium transition metal oxide, nonaqueous electrolyte secondary battery comprising same, and method for producing positive electrode active material for nonaqueous electrolyte secondary batteries comprising nickel-containing lithium transition metal oxide

A positive electrode active material for a nonaqueous electrolyte secondary battery, the positive electrode active material comprising a Ni-containing lithium composite oxide a, b, wherein the Ni-containing lithium composite oxide a has an average primary particle size of 1 μm or more which is larger than the average primary particle size of the Ni-containing lithium composite oxide b, the Ni-containing lithium composite oxide a has an average secondary particle size of 2 to 6 μm, the Ni-containing lithium composite oxide b has an average primary particle size of 0.05 μm or more and an average secondary particle size of 10 to 20 μm, the Ni-containing lithium composite oxide a contains Mn and at least one of B and Al, the Ni-containing lithium composite oxide b contains Mn, and the ratio of the Ni-containing lithium composite oxide a to the Ni-containing lithium composite oxide b is 5:95 to 55:45.

Positive electrode active material for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

A positive electrode active material for a non-aqueous electrolyte secondary battery according to an embodiment of the present disclosure is represented by a general formula of LiNiMO(where M includes at least one metal element selected from Co and Mn, 0.1&#x2264;x&#x2264;1.2, 0.3&#x3c;y&#x3c;1), has a volumetric average particle size (D50) of 7 &#x3bc;m or more and 30 &#x3bc;m or less, and has an average surface roughness of 4%, or less.

Positive electrode active material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

The positive electrode active material with lithium composite oxide A containing W and Ni and W-free lithium composite oxide B containing Ni. Regarding the lithium composite oxide A, the proportion of Ni relative to the total moles of metal elements except for lithium is 30 to 60 mol %, 50% particle size D50 is 2 to 6 &#x3bc;m, 10% particle size D10 is 1.0 &#x3bc;m or more, and 90% particle size D90 is 6.8 &#x3bc;m or less. Regarding the lithium composite oxide B, the proportion of Ni relative to the total moles of metal elements except for lithium is 50 to 95 mol %, 50% particle size D50 is 10 to 22 &#x3bc;m, 10% particle size D10 is 7.0 &#x3bc;m or more, and 90% particle size D90 is 22.5 &#x3bc;m or less. The mass ratio of the lithium composite oxide B to the lithium composite oxide A is 1:1 to 5.7:1.

Positive electrode active material for nonaqueous electrolyte secondary battery, positive electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

This positive electrode active substance for a nonaqueous electrolyte secondary battery contains secondary particles that are aggregates of primary particles of a lithium transition metal oxide. The average particle diameter of the primary particles is within the range of 0.5 to 2 &#x3bc;m, the compressive breaking strength of the primary particles is 1,000 MPa or greater, and the crystallite diameter of the primary particles is within the range of 100 to 280 nm.

Positive electrode active substance for nonaqueous electrolyte secondary battery, positive electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A positive electrode active material for nonaqueous electrolyte secondary batteries includes secondary particles of lithium transition metal oxide including aggregates of primary particles of the oxide. The primary particles have an average particle size of not less than 1 &#x3bc;m, and the secondary particles have a void content of more than 30%.

Positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

A positive electrode for a nonaqueous electrolyte secondary battery includes a positive electrode current collector and a positive electrode mixture layer which contains a positive electrode active material and is disposed on the positive electrode current collector. The void ratio of the positive electrode mixture layer is 30% or less, and the void ratio of secondary particles of the positive electrode active material is within a range of 30% or more and 70% or less of the void ratio of the positive electrode mixture layer.

Positive electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

A positive electrode active material for nonaqueous electrolyte secondary batteries, which has high energy density and excellent cycle characteristics. A positive electrode active material for nonaqueous electrolyte secondary batteries of the present invention is represented by general formula LiNiCoMO(wherein M represents at least one element selected from among metal elements, 0.3&#x2264;x&#x3c;1.0 and 0&#x3c;y&#x2264;0.5) and is configured of particles, each of which is an aggregate of crystallites. Each particle has a compressive breaking strength of from 200 MPa to 500 MPa (inclusive), and the crystallite diameter in the vector direction of the particle is from 100 nm to 300 nm (inclusive).

A positive electrode active material for a non-aqueous electrolyte secondary battery according to an embodiment of the present disclosure is represented by a general formula of LiNiMO(where M includes at least one metal element selected from Co and Mn, 0.1&#x2264;x&#x2264;1.2, 0.3&#x3c;y&#x3c;1), has a volumetric average particle size (D50) of 7 &#x3bc;m or more and 30 &#x3bc;m or less, and has an average surface roughness of 4% or less.

A positive electrode active material for a nonaqueous electrolyte secondary battery is used for a nonaqueous electrolyte secondary battery. The positive electrode active material includes a composite oxide containing at least lithium, nickel, and manganese and contains aggregated particles of primary particles having an average particle diameter of 1.0 &#x3bc;m or more. The primary particles have a layered crystal structure and a spinel crystal structure.

Positive electrode active material for nonaqueous electrolyte secondary battery

A positive electrode active material for a nonaqueous electrolyte secondary battery contains, as a main component, a lithium composite oxide in which a ratio of Ni relative to a total number of moles of metal elements other than Li is greater than 30 mol %. The lithium composite oxide is a secondary particle being aggregation of primary particles having an average particle diameter of 3 &#x3bc;m or more and 20 &#x3bc;m or less, and having a compression rupture strength of 100 MPa or more and less than 200 MPa. The lithium composite oxide contains at least one element selected from Ba, Ca, and Sr.

Positive electrode active material for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A positive electrode active material for use in nonaqueous electrolyte secondary batteries. The active material is composed of particles each formed by the gathering of grains that comprises at least one metal element selected from the group consisting of Ta and Nb. One of the particles has a compression fracture strength of 500 MPa or more. The grain diameter in the (110) vector direction of the particles is 100 nm to 300 nm.

Positive electrode active material for nonaqueous electrolyte secondary batteries and nonaqueous electrolyte secondary battery

A positive electrode active material for a nonaqueous electrolyte secondary battery contains a lithium composite oxide particle as a main component, in which a ratio of Ni to a total number of moles of all metal elements other than Li is greater than 30 mol %. The lithium composite oxide particle includes a secondary particle being aggregation of primary particles having an average particle diameter of 1 &#x3bc;m or more, and a shell constituted around the secondary particle. A surface layer void is present between the secondary particle and the shell.

A positive electrode active material for a non-aqueous electrolyte secondary battery according to an example of an embodiment of the present disclosure includes a lithium composite oxide as a main component. The ratio of a number of moles of Ni in the lithium composite oxide to a total number of moles of metal elements in the lithium composite oxide other than Li is larger than 30 mol %. The lithium composite oxide includes particles each including aggregated primary particles having a volumetric average particle size of 0.5 &#x3bc;m or more and at least one element selected from W, Mo, Nb, and Ta is dissolved in the lithium composite oxide.

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Osaka, Japan

Hidekazu Hiratsuka