Sony Corporation

Other

Hideto Azuma

Haruo Watanabe

Tomoyo Ooyama

Atsuo Omaru

Yosuke Hosoya

Hiroshi Imoto

Guohua Li

Yoshio Nishi

Shinichiro Yamada

Masayuki Nagamine

Atsuo Yamada

Kenji Ogisu

Masanori Soma

Hiroyuki Akashi

Momoe Adachi

Yoshihisa Gonno

Kotaro Satori

Nozomu Morita

Kiyohiko Suzuki

Kenichi Kitamura

Kohichi Tanaka

Terue Sasaki

Shigeru Fujita

Naohiro Sonobe

Jiro Masuko

Koji Sekai

Minoru Ishikawa

Tadashi Senoo

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 cathode active material capable of increasing a capacity and improving high temperature characteristics or cycle characteristics, a method of manufacturing it, a cathode using the cathode active material, and a battery using the cathode active material are provided. In a cathode active material contained in a cathode, a coating layer is provided on at least part of complex oxide particle containing at least lithium (Li) and cobalt (Co). The coating layer is an oxide which contains lithium (Li) and at least one of nickel (Ni) and manganese (Mn).

Cathode active material, method of manufacturing it, cathode, and battery

A method of manufacturing a cathode active material is provided. The method includes the step of precipitating step for providing a solution of a deposition component onto composite oxide particles including lithium Li and nickel Ni, removing a solvent from the solution on the composite oxide particles within a short time period, and precipitating the deposition component on surfaces of the composite oxide particles; and heating step for heating under an oxidation atmosphere the composite oxide particles with the deposition component precipitated on the surfaces.

Method of manufacturing cathode active material

A cathode active material capable of increasing a capacity and improving high temperature characteristics or cycle characteristics, a method of manufacturing it, a cathode using the cathode active material, and a battery using the cathode active material are provided. In a cathode active material contained in a cathode, a coating layer is provided on at least part of a complex oxide particle containing at least lithium (Li) and cobalt (Co). The coating layer is an oxide which contains lithium (Li) and at least one of nickel (Ni) and manganese (Mn).

A non-aqueous electrolyte secondary battery employing a positive electrode active material containing a compound represented by the general formula LiMPO, where 0&#x3c;x&#x2266;2 and 0.8&#x2266;y&#x2266;1.2, with M containing a 3d transition metal, where LiMPOencompasses that with the grain size not larger than 10 &#x3bc;m. The non-aqueous electrolyte secondary battery has superior cyclic characteristics and a high capacity.

Positive electrode active material, non-aqueous electrolyte secondary battery and method for producing positive electrode active material

A non-aqueous electrolyte secondary battery employing a positive electrode active material containing a compound represented by the general formula Li M PO , where 0<x&lE;2 and 0.8&lE;y&lE;1.2, with M containing a 3d transition metal, where Li M PO encompasses that with the grain size not larger than 10 &mgr;m. The non-aqueous electrolyte secondary battery has superior cyclic characteristics and a high capacity.

Positive electrode active material, non-aqueous electrolyte secondary battery and method for producing positive electrode active material of positive material

A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous solvent secondary battery, is constituted by a carbonaceous material having a true density as measured by a butanol substitution method of at most 1.46 g/cm , a true density as measured by a helium substitution method of at least 1.7 g/cm , a hydrogen-to-carbon atomic ratio H/C of at most 0.15 as measured according to elementary analysis, a BET specific surface area of at most 50 m /g as measured by nitrogen adsorption BET method, and a carbon dioxide adsorption capacity of at least 10 ml/g. The carbonaceous material is advantageously produced by carbonizing an organic material originated from bamboo genera of family Gramineae, particularly genus Pleioblastus or Bambusa, at 1000-1400&deg; C. under a reduced pressure or under a flowing inert gas stream to provide an appropriate porous structure.

Carbonaceous electrode material for non-aqueous secondary battery

A negative electrode material for a secondary cell for anon-aqueous liquid electrolyte for realizing a high charging/discharging capacity and a high discharging efficiency, a method for producing such material and a non-aqueous liquid electrolyte secondary cell employing such material. The negative electrode material contains at least one carbonaceous material selected from the group consisting of coffee beans, tea leaves, cane sugar, corns, fruits, straws of cereals and husks of cereals, a carbonaceous material derived from a plant-origin high molecular material containing a sum total of 0.2 to 20 wt % of metal elements, phosphorus and sulphur calculated as elements or a carbonaceous material having a diffraction peak between 30.degree. and 32.degree. of the 2.theta. diffraction angle in the X-ray (CuK.alpha.) powder diffraction pattern. For producing the negative electrode material, at least one carbonaceous material selected from the group consisting of coffee beans, tea leaves, cane sugar, corns, fruits, straws of cereals and husks of cereals, or crystalline or fibrous cellulose admixed with at least one of metal elements, phosphorus or sulphur, is sintered for carbonization. The negative electrode material is used for a non-aqueous liquid electrolyte secondary cell having a positive electrode formed of a lithium compound oxide and a negative electrode formed of a carbonaceous negative electrode material capable of doping and dedoping lithium ions as an active negative electrode material.

Negative electrode material for non-aqueous liquid electrolyte secondary

An anode material consisting of non-graphitizable carbon material obtained by baking a carbon precursor is disclosed. In this non-graphitizable carbon material, a ratio by weight of carbon Ps in a stacking structure as determined from diffraction peak originating in a (002) crystal lattice plane and X-ray diffraction spectrum components on the lower angle side with respect to the diffraction peak originating in the (002) crystal lattice plane of X-ray diffraction spectrum is smaller than 0.59, or the stacking index SI thereof is smaller than 0.76. Moreover, an average number of carbon layers n.sub.ave in a stacking structure is smaller than 2.46. Alternatively, when the baking temperature is T.degree.C. and the half width at half maximum of the peak appearing in the vicinity of 1340 cm.sup.-1 in the Raman spectrum is HW, the condition expressed below is satisfied.

Anode material and method of manufacturing the same

A carbonaceous material and a non-aqueous electrolyte cell using the carbonaceous material as an anode are disclosed. The carbonaceous material has an interlayer spacing, d.sub.002, of not less than 3.70 angstroms and a true density of less than 1.70 g/cm.sup.3, and contains from 0.2 to 5.0 weight % of phosphorus. The carbonaceous material has a large doping capacity for Li, and the non-aqueous electrolyte cell using the material has a large capacity and improved charge-discharge cycle characteristics.

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Fukushima, Japan

Hideto Azuma