Murata Manufacturing Co., Ltd.

Takashige Fujikawa

Masaki Kuratsuka

Atsushi Ouki

Sho Takahashi

Shinichi Katayama

Shoichi Nishiyama

Ryuji Soeda

Takatoshi Munaoka

Yosuke Koike

Takamasa Ono

Masumi Fukuda

Yosuke Kono

Yoshinori Gamoh

Shinji Hayazaki

Takeo Asanuma

Susumu Endo

Ryosuke Matsuoka

Yousuke Shima

Atsushi Nemoto

Yoshihito Akiyama

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a lithium-nickel composite oxide. The negative electrode includes a lithium-titanium composite oxide. The electrolytic solution includes a carboxylic acid ester. The carboxylic acid ester includes at least one of ethyl acetate, propyl acetate, ethyl propionate, or propyl propionate. A first oxygen spectrum and a second oxygen spectrum are detectable by a surface analysis of the positive electrode by X-ray photoelectron spectroscopy. The first oxygen spectrum has a peak within a range of binding energy that is greater than or equal to 528 eV and less than or equal to 531 eV. The second oxygen spectrum has a peak within a range of binding energy that is greater than 531 eV and less than or equal to 535 eV. A ratio of an intensity of the first oxygen spectrum to an intensity of the second oxygen spectrum is greater than or equal to 0.30 and less than or equal to 0.80. A third oxygen spectrum and a fourth oxygen spectrum are detectable by a surface analysis of the negative electrode by the X-ray photoelectron spectroscopy. The third oxygen spectrum has a peak within a range of binding energy that is greater than or equal to 528 eV and less than or equal to 531 eV. The fourth oxygen spectrum has a peak within a range of binding energy that is greater than 531 eV and less than or equal to 535 eV. A ratio of an intensity of the third oxygen spectrum to an intensity of the fourth oxygen spectrum is greater than or equal to 0.82 and less than or equal to 1.35.

Secondary battery

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes a lithium-nickel composite oxide of a layered rock-salt type.

Positive electrode for secondary battery, and secondary battery

A positive electrode active material for a secondary battery includes a center part and a covering part. The center part includes a layered rock-salt lithium-nickel composite oxide. The covering part covers a surface of the center part and includes a boron compound. The positive electrode active material has a crystallite size of a (104) plane that is greater than or equal to 40.0 nm and less than or equal to 74.5 nm. The crystallite size is calculated by X-ray diffractometry and Scherrer equation. The positive electrode active material has a specific surface area that satisfies a condition represented by −0.0160×Z+1.72≤A≤−0.0324×Z+2.94 where Z is the crystallite size (nm), and A is the specific surface area (m/g). The specific surface area is measured by BET specific surface area measurement method.

Positive electrode active material for secondary battery, and secondary battery

A secondary battery includes a positive electrode; a negative electrode including a negative electrode active material layer including a negative electrode active material and a negative electrode conductive agent, and an electrolytic solution. The negative electrode active material includes a plurality of primary negative electrode active material particles and a plurality of secondary negative electrode active material particles, and the negative electrode active material includes a lithium titanium composite oxide.

Secondary battery, battery pack, electrically driven vehicle, electric power storage system, electric tool, and electronic device

A secondary battery includes a cathode; an anode (1) including a plurality of carbon particles and a plurality of non-carbon particles, (2) the carbon particles containing graphite, (3) the non-carbon particles containing a material including, as a constituent element, one or more of silicon (Si), tin (Sn), and germanium (Ge), and (4) a distribution of a first-order differential value of an integrated value Q of a relative particle amount with respect to a particle diameter D of the plurality of carbon particles having one or more discontinuities, where a horizontal axis and a vertical axis of the distribution indicate the particle diameter D (&#x3bc;m) and a first-order differential value dQ/dD, respectively; and an electrolyte.

Secondary battery-use active material, secondary battery-use electrode, secondary battery, electric vehicle, and electronic apparatus

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Kanagawa, Japan

Takashige Fujikawa