Sony Corporation

Kotaro Satori

Akinori Kita

Atsuo Omaru

Kenichi Kawase

Haruo Watanabe

Yosuke Hosoya

Koji Morita

Isamu Konishiike

Masayuki Iwama

Guohua Li

Hideto Azuma

Tomoyo Ooyama

Nozomu Morita

Kiyohiko Suzuki

Koichi Matsumoto

Takakazu Hirose

Kimio Takahashi

Yuzuru Fukushima

Takashi Fujinaga

Hideki Terashima

Shunsuke Kurasawa

Rikako Imoto

Hiroko Ohnuma

A cathode active material capable of obtaining a high capacity and capable of improving stability or low-temperature characteristics, a method of manufacturing the same, and a battery are provided. A cathode () includes a cathode active material including a lithium complex oxide including Li and at least one kind selected from the group consisting of Co, Ni and Mn, and P and at least one kind selected from the group consisting of Ni, Co, Mn, Fe, Al, Mg and Zn as coating elements on a surface of the lithium complex oxide. Preferably, the contents of the coating elements are higher on the surface of the cathode active material than those in the interior thereof, and decrease from the surface to the interior.

Cathode active material, method of manufacturing the same and battery

A secondary battery having high cycle characteristics is provided. The secondary battery includes a cathode, an anode, and an electrolyte. In the anode, an anode active material layer containing silicon, carbon, and oxygen as an anode active material is provided on an anode current collector. In the anode active material, a content of carbon is from 0.2 atomic % to 10 atomic % both inclusive, and a content of oxygen is from 0.5 atomic % to 40 atomic % both inclusive. A ratio from 0.1% to 17.29% both inclusive of the silicon contained in the anode active material exists as Si&#x2014;C bond.

Anode and secondary battery including the same

A current collector forming an electrode for battery. The electrode current collector is made of copper or a copper alloy, and has a front surface color and a back surface color, at least one color of which is a color belonging to a color space represented by:50&#x2266;*&#x2266;80, 5&#x2266;*&#x3c;60, 5&#x2266;*&#x3c;60,where L*, a*, and b* are numeric values determined based on the L*a*b* calorimetric system described in JIS Z 8729.

Electrode current collector and method for inspecting the same, electrode for battery and method for producing the same, and secondary battery and method for producing the same

A method for making a negative electrode component used in a nonaqueous secondary battery that includes the steps of polishing the surface of the negative electrode component by irradiating the surface with light to produce a negative electrode that includes a carbonaceous material in which the ratio RG=Gs/Gb is at least 4.5, where Gs is the degree of graphitization the carbonaceous material as determined by a surface-enhanced Raman spectrum and Gb is degree of graphitization of the carbonaceous material as determined by a Raman spectrum measured using argon laser light and both Gs and Gb are measured under set parameters.

Method for making negative electrode component including a carbonaceous material for use in a nonaqueous secondary battery

A battery capable of improving cycle characteristics is provided. An anode active material layer is alloyed with an anode current collector at least in part of the interface with the anode current collector. The anode active material layer contains silicon and oxygen as an element. The average oxygen content in the anode active material layer is 40 atom % or less. When the average oxygen content on the current collector side is A and the average oxygen content on the surface side is B where the anode active material layer is divided into two in the thickness direction, the average oxygen content on the current collector side A is larger than the average oxygen content on the surface side B, and the difference therebetween, A&#x2212;B is from 4 atom % to 30 atom %.

Battery

A negative electrode of a nonaqueous secondary battery is formed of a carbonaceous material. The ratio RG=Gs/Gb of the degree of graphitization Gs of the carbonaceous material, determined by a surface-enhanced Raman spectrum, to the degree of graphitization Gb, determined by a Raman spectrum measured using argon laser light, is at least 4.5. Alternatively, the carbonaceous material has a peak in a wavelength range above 1,360 cmin a surface-enhanced Raman spectrum which is measured by the same surface-enhanced Raman spectrum. The deterioration of the nonaqueous secondary battery is suppressed during use in high-temperature environments and high capacity is maintained for long periods.

Nonaqueous secondary battery, method for making negative electrode component therefor, and apparatuses for evaluating and making graphite material for negative electrode component

The present invention provides a non-aqueous electrolyte secondary cell including: a cathode containing a manganese oxide or a lithium-manganese composite oxide; an anode containing a lithium metal, a lithium alloy, or a material capable of doping/dedoping lithium; and an electrolyte containing at least two electrolyte salts, one of which is LiBF contained in the range from 0.005 mol/l to 0.3 mol/l. This enables to increase the cycle characteristic, preventing deterioration of the cell characteristic caused by a repeated use.

Non-aqueous electrolyte secondary cell

A negative electrode of a nonaqueous secondary battery is formed of a carbonaceous material. The ratio RG&equals;Gs/Gb of the degree of graphitization Gs of the carbonaceous material, determined by a surface-enhanced Raman spectrum, to the degree of graphitization Gb, determined by a Raman spectrum measured using argon laser light, is at least 4.5. Alternatively, the carbonaceous material has a peak in a wavelength range above 1,360 cm in a surface-enhanced Raman spectrum which is measured by the same surface-enhanced Raman spectrum. The deterioration of the nonaqueous secondary battery is suppressed during use in high-temperature environments and high capacity is maintained for long periods.

Nonaqueous secondary battery, method for making negative electrode component therefor, and apparatus for evaluating and making graphite material for negative electrode component

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Kanagawa, Japan

Kotaro Satori