Murata Manufacturing Co., Ltd.

Takatoshi Munaoka

Masayuki Ihara

Shigeru Fujita

Masaki Kuratsuka

Yoshihide Nagata

Shinichi Katayama

Keitaro Kitada

Takashige Fujikawa

Atsushi Ouki

Kenji Matsubara

Takuju Hashimoto

Yousuke Shima

Yuko Ohtaniuchi

Aiko Kanazawa

Nobuyuki Nagaoka

Masahiro Kikkawa

Takeshi Morozumi

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

The secondary battery includes an electrolytic solution, a positive electrode and a negative electrode, and the negative electrode includes a plurality of particulate negative electrode active materials, a first negative electrode binder, and a plurality of second negative electrode binders with an average particle size smaller than the plurality of particulate negative electrode active materials. The plurality of particulate negative electrode active materials have an average particle size of 5 &#x3bc;m or more and 30 &#x3bc;m or less. The first negative electrode binder includes one or both of a styrene butadiene rubber and a derivative thereof. The plurality of second negative electrode binders include one or both of a polyvinylidene fluoride and a derivative thereof, and the plurality of second negative electrode binders have an average particle size of 0.1 &#x3bc;m or more and 10 &#x3bc;m or less.

Negative electrode for secondary battery, secondary battery, battery pack, electric vehicle, power storage system, power tool, and electronic device

A secondary battery includes a cathode, an anode, and an electrolytic solution, in which the anode includes a plurality of first anode active material particles, a plurality of second anode active material particles, a first anode binder, and a second anode binder. The plurality of first anode active material particles include carbon, and an R value of the plurality of first anode active material particles is from 0.35 to 0.45, and a median diameter of the plurality of first anode active material particles is from 5 &#x3bc;m to 14.5 &#x3bc;m. The plurality of second anode active material particles include carbon, and the R value of the plurality of second anode active material particles is from 0.1 to 0.25, and a median diameter of the plurality of second anode active material particles is from 15 &#x3bc;m to 25 &#x3bc;m.

Anode for secondary battery, secondary battery, battery pack, electric motor vehicle, power storage system, electric tool, and electronic device

Provided are a negative electrode, a battery, a battery pack, an electronic apparatus, an electrically driven vehicle, an electrical storage device, and an electric power system which are capable of improving cycle characteristics.

Negative electrode, battery, battery pack, electronic apparatus, electrically driven vehicle, electrical storage device, and electric power system

A secondary battery includes a cathode, an anode including an active material, and non-aqueous electrolytic solution. The active material includes a center portion and a covering portion provided on part or all of the center portion. The center portion includes silicon, tin, or both as constituent elements. The covering portion includes a plurality of fibrous carbon materials. Part or all of the fibrous carbon materials extend in a direction along a surface of the center portion and are closely attached to the center portion.

Active material, method of manufacturing active material, electrode, and secondary battery

Growing community of inventors

Kyoto, Japan

Takatoshi Munaoka