Panasonic Intellectual Property Management Co., Ltd.

Shuhei Uchida

Ryuichi Natsui

Kensuke Nakura

Takuji Tsujita

Yu Otsuka

Takanori Omae

Yoshinori Satou

An active material particle include a lithium silicate composite particle including a lithium silicate phase, and silicon particles dispersed in the lithium silicate phase, and a first coating that covers at least a portion of a surface of the lithium silicate composite particle; wherein the first coating includes an oxide of a first element other than a non-metal element, and a carbon atom, the first coating has a thickness T1, an element ratio Rb of the first element relative to the carbon atom at a position of 0.25T1of the first coating from the surface of the lithium silicate composite particle, and an element ratio Rt of the first element relative to the carbon atom at a position of 0.75T1of the first coating from the surface of the lithium silicate composite particle satisfy Rb>Rt.

Active material particles, electrochemical element, method for producing said active material particles, method for producing said electrochemical element, and electrochemical device

This electrode for nonaqueous electrolyte secondary batteries is provided with a collector, an active material layer that is formed on the collector, and an assembly of filler particles, said assembly being present on the surface of the active material layer. The filler particles contain at least one of boron oxide, potassium pyrosulfate and a compound containing an alkali metal or Br, while having a transformation point, at which the filler particles undergo a transformation from a solid phase to a liquid phase or a thermal decomposition, within the range of from 180° C. to 650° C. The compound containing an alkali metal or Br contains at least one of a borate, a silicate, a carbonate, a hydrogen carbonate, a citrate or an aromatic compound.

Electrode for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

A positive electrode active material includes a first lithium composite oxide and a second lithium composite oxide that covers at least a part of the surface of the first lithium composite oxide. The first lithium composite oxide includes at least one selected from the group consisting of F, Cl, N, and S. The first lithium composite oxide has a crystal structure belonging to a layered structure. The second lithium composite oxide has a crystal structure belonging to space group Fd-3m. The positive electrode active material has an integrated intensity ratio I)/Iof greater than or equal to 0.05 and less than or equal to 0.90.

Positive electrode active material and battery including the same

A positive electrode active material includes a lithium composite oxide having a crystal structure belonging to the space group Fd-3m and has an integrated intensity ratio I/Iof greater than or equal to 0.05 and less than or equal to 0.90 and an integrated intensity ratio I/Iof greater than or equal to 0.8 and less than or equal to 2.0. The integrated intensity ratio I/Iis a ratio of an integrated intensity Ito an integrated intensity I. The integrated intensity ratio I/Iis a ratio of an integrated intensity Ito an integrated intensity I. The integrated intensity Iis an integrated intensity of a maximum peak present in a range of angle of diffraction 2θ greater than or equal to A° and less than or equal to B° in the X-ray diffraction pattern of the positive electrode active material.

A cathode active material includes a lithium composite oxide having a crystal structure which belongs to a layered structure. The lithium composite oxide has a BET specific surface area of not less than 5 m/g and not more than 10 m/g. The lithium composite oxide has an average particle size of not less than 3 &#x3bc;m and not more than 30 &#x3bc;m. The lithium composite oxide, an average crystallite size calculated by an X-ray diffraction method is not less than 150 &#x212b; and not more than 350 &#x212b;.

Cathode active material including lithium composite oxide having a layered crystal structure

Provided is a cathode active material comprising a lithium composite oxide and a covering material which covers a surface of the lithium composite oxide. The lithium composite oxide is a multi-phase mixture including a first phase having a crystal structure which belongs to a monoclinic crystal; a second phase having a crystal structure which belongs to a hexagonal crystal; and a third phase having a crystal structure which belongs to a cubical crystal. The lithium composite oxide has an integral intensity ratio I/Iof not less than 0.05 and not more than 0.99, where the integral intensity Iis an integral intensity of a peak which is a maximum peak present within a range of a diffraction angle 2&#x3b8; of not less than &#x3b1;&#xb0; and not more than &#x3b2;&#xb0; in an X-ray diffraction pattern of the lithium composite oxide. The covering material has an electronic conductivity of not more than 10S/m.

Cathode active material, and battery using the same

A cathode active material includes a lithium composite oxide and a covering material which covers a surface of the lithium composite oxide. The lithium composite oxide is a multi-phase mixture including a first phase having a crystal structure which belongs to a space group C2/m and a second phase having a crystal structure which belongs to a space group R-3m. The lithium composite oxide has an integral intensity ratio I/Iof not less than 0.05 and not more than 1.15, where the integral intensity ratio I/Iis a ratio of an integral intensity Ito an integral intensity I. The integral intensity Iis an integral intensity of a first peak which is a maximum peak present within a range of a diffraction angle 2&#x3b8; of not less than &#x3b1;&#xb0; and not more than &#x3b2;&#xb0; in an X-ray diffraction pattern of the lithium composite oxide.

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Osaka, Japan

Shuhei Uchida