Toda Kogyo Corporation

Taiki Imahashi

Hideaki Sadamura

Hiroyasu Watanabe

Kazuhiko Kikuya

Osamu Sasaki

Satoshi Nakamura

Akihisa Kajiyama

Teruaki Santoki

Kazutoshi Ishizaki

Nobuyuki Tagami

The present invention provides lithium composite compound particles having good high-temperature storage property and excellent cycle characteristics as an active substance for a non-aqueous electrolyte secondary battery, and a secondary battery using the lithium composite compound particles. The Li&#x2014;Ni composite oxide particles for a non-aqueous electrolyte secondary battery according to the present invention have a BET specific surface area of 0.05 to 0.8 m/g; an atomic ratio (Ma/Ni) of a concentration of an amphoteric metal to a concentration of Ni on an outermost surface of the respective Li&#x2014;Ni composite oxide particles is 2 to 6; and the concentration of the amphoteric metal on the outermost surface of the respective Li&#x2014;Ni composite oxide particles is higher than a concentration of the amphoteric metal at a position spaced by 50 nm from the outermost surface toward a center of the respective Li&#x2014;Ni composite oxide particles.

Li&#x2014;Ni composite oxide particles and process for producing the same, and non-aqueous electrolyte secondary battery

The present invention relates to lithium composite compound particles having a composition represented by the formula: LiNiCoMO(M=B or Al), wherein the lithium composite compound particles have an ionic strength ratio A (LiO/NiO) of not more than 0.3 and an ionic strength ratio B (LiCO/Ni) of not more than 20 as measured on a surface of the respective lithium composite compound particles using a time-of-flight secondary ion mass spectrometer. The lithium composite compound particles of the present invention can be used as a positive electrode active substance of a secondary battery which has good cycle characteristics and an excellent high-temperature storage property.

Lithium composite compound particles and process for producing the same, and non-aqueous electrolyte secondary battery

The present invention aims to provide lithium composite compound particles which can exhibit good cycle characteristics and an excellent high-temperature storage property when used as a positive electrode active substance of a secondary battery, and a secondary battery using the lithium composite compound particles. The present invention relates to lithium composite compound particles having a composition represented by the compositional formula: LiNiCoMnMO, in which the lithium composite compound particles have an ionic strength ratio A (LiO/NiO) of not more than 0.5 and an ionic strength ratio B (LiCO/Ni) of not more than 20 as measured on a surface of the respective lithium composite compound particles using a time-of-flight secondary ion mass spectrometer.

The present invention relates to Li&#x2014;Ni-based composite oxide particles comprising Mn, and Co and/or Al, wherein Co and Al are uniformly dispersed within the particles, and Mn is present with a gradient of its concentration in a radial direction of the respective particles such that a concentration of Mn on a surface of the respective particles is higher than that at a central portion thereof. The Li&#x2014;Ni-based composite oxide particles can be produced by allowing an oxide and a hydroxide comprising Mn to mechanically adhere to Li&#x2014;Ni-based oxide comprising Co and/or Al; and then heat-treating the obtained material at a temperature of not lower than 400&#xb0; C. and not higher than 1,000&#xb0; C. The Li&#x2014;Ni-based composite oxide particles of the present invention are improved in thermal stability and alkalinity.

Li&#x2014;Ni-based composite oxide particles for non-aqueous electrolyte secondary battery, process for producing the same, and non-aqueous electrolyte secondary battery

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Fukuoka-ken, Japan

Taiki Imahashi