Hitachi Maxell, Limited

Maxell Holdings, Ltd.

Satoshi Kono

Masayuki Yamada

Mitsuhiro Kishimi

Akira Inaba

Kazutaka Matsuo

Masayuki Oya

Atsushi Hatakeyama

Toshiharu Shimooka

Itaru Gosho

An electrode active material includes particles of a lithium-containing composite oxide represented by the general compositional formula: LiMO, where &#x2212;0.15&#x2266;x&#x2266;0.15, and M represents an element group of three or more elements including at least Ni, Co and Mn, wherein the ratios of Ni, Co and Mn to the total elements constituting M satisfy 45&#x2266;a&#x2266;90, 5&#x2266;b&#x2266;30, 5&#x2266;c&#x2266;30 and 10&#x2266;b+c&#x2266;55, where the ratios of Ni, Co and Mn are represented by a, b and c, respectively, in units of mol %, the average valence A of Ni in the whole particles is 2.2 to 3.2, the valence B of Ni on the surface of the particles has the relationship: B&#x3c;A, the average valence C of Co in the whole particles is 2.5 to 3.2, the valence D of Co on the surface of the particles has the relationship: D&#x3c;C, and the average valence of Mn in the whole particles is 3.5 to 4.2.

Electrode active material, method for producing same, electrode for nonaqueous secondary battery, and nonaqueous secondary battery

A positive electrode material that can form a positive electrode mixture containing composition with reduced changes over time and high productivity, a manufacturing method thereof, a non-aqueous rechargeable battery less likely to swell and having a high storage characteristic during storage at high temperatures, and a positive electrode that can form the battery are provided. The object is solved by providing a positive electrode material having a coating layer of an organic silane compound on a surface of a positive electrode active material made of a lithium nickel composite oxide represented by the general compositional formula (1): LiMOwhere &#x2212;0.5&#x2266;x&#x2266;0.5, M represents a group of at least two elements including at least one of Mn and Co and Ni, and 20&#x2266;a&#x3c;100 and 50&#x2266;a+b+c&#x2266;100 when the ratios (mol %) of Ni, Mn, and Co in the elements forming M are a, b, and c, respectively.

Positive electrode material, manufacturing method thereof, positive electrode for non-aqueous rechargeable battery, and non-aqueous rechargeable battery

A lithium secondary battery positive electrode according to the present invention is a lithium secondary battery positive electrode including a positive electrode material mixture layer containing a positive electrode active material and a conductivity enhancing agent on one or both sides of a current collector, wherein the positive electrode active material contains a lithium-containing composite oxide, the conductivity enhancing agent contains carbon fibers having an average fiber length of 10 nm or more and less than 1000 nm and an average fiber diameter of 1 nm or more and 100 nm or less, and the content of the carbon fibers in the positive electrode material mixture layer is 0.25 mass % or more and 1.5 mass % or less.

Lithium secondary battery positive electrode and lithium secondary battery

The present invention provides a nonaqueous secondary battery with a high capacity, an excellent level of safety, and excellent charge-discharge cycle characteristics. The negative electrode contains, as negative electrode active materials, a graphite carbon material and a material containing Si as a constituent element, and the positive electrode includes, as a positive electrode active material, a lithium-containing composite oxide represented by the following general composition formula (1) and containing sulfur in a range of 0.01 mass % to 0.5 mass %:LiMO&#x2003;&#x2003;(1) where y satisfies &#x2212;0.3&#x2266;y&#x3c;0.3, M represents a group of five or more elements including Ni, Co, Mn, Mg and at least one of Al, Ba, Sr, Ti and Zr, and when a, b, c and d represent Ni, Co, Mn, and Mg, respectively, in mol % and e represents a total of Al, Ba, Sr, Ti and Zr in mol % of all of the elements making up M, a, b, c, d, and e satisfy 70&#x2266;a&#x2266;97, 0.5&#x3c;b&#x3c;30, 0.5&#x3c;c&#x3c;30, 0.5&#x3c;d&#x3c;30, &#x2212;10&#x3c;c&#x2212;d&#x3c;10, &#x2212;8&#x2266;(c&#x2212;d)/d&#x2266;8, and e&#x3c;10.

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Osaka, Japan

Satoshi Kono