Sanyo Electric Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Taiki Satow

Masaya Ugaji

Shinji Kasamatsu

Takeshi Ogasawara

Masaki Deguchi

Taizou Sunano

Nobuhiro Hirano

Kentaro Takahashi

Takao Kokubu

A positive electrode for a nonaqueous electrolyte secondary battery that does not undergo a decrease in discharge capacity in low-temperature discharge during charge and discharge after the battery is left standing at high temperature in a charged state, for example. The positive electrode for a nonaqueous electrolyte secondary battery includes a positive electrode active material. The positive electrode active material includes a mixture of lithium nickel cobalt manganate and lithium cobaltate having a compound adhered to part of a surface thereof, the compound containing fluorine and at least one selected from zirconium, magnesium, titanium, aluminum, and a rare earth element; and a ratio of the lithium nickel cobalt manganate relative to a total amount of the positive electrode active material is 1% by mass or more and less than 70% by mass.

Positive electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery that uses the positive electrode

A negative electrode for nonaqueous electrolyte secondary batteries includes a negative electrode core member and a negative electrode mixture layer attached to the negative electrode core member, wherein the negative electrode mixture layer contains negative electrode active material particles with a graphite structure and a binder, the mixture density of the negative electrode mixture layer is 1.5 g/cmto 1.8 g/cm, the ratio I/Iof the diffraction intensity Iof the (002) plane to the diffraction intensity Iof the (110) plane satisfies 60&#x2266;I/I&#x2266;120 as determined by measuring the negative electrode mixture layer by an X-ray diffraction method, the amount of particles with a size of 1 &#x3bc;m to 10 &#x3bc;m in the particle size distribution of a crushed product of the negative electrode mixture layer is 12% to 25% by volume.

Negative electrode for nonaqueous electrolyte secondary batteries and nonaqueous electrolyte secondary battery including the same

Provided is a negative electrode for lithium ion secondary batteries, which can enhance the penetration of non-aqueous electrolyte, and can improve the input-output characteristics. The negative electrode includes a negative electrode core material sheet, and a negative electrode material mixture layer supported thereon. The negative electrode material mixture layer includes negative electrode active material particles, and a binder. The negative electrode material mixture layer has a plurality of pores interspersed on the surface and in the interior of the negative electrode material mixture layer. The pores have an average maximum diameter R of 45 to 125 &#x3bc;m. The pores have a number density of 8 to 17 pores per 1 cmof the surface of the negative electrode material mixture layer or per 1 cmof a cross section in the plane direction of the negative electrode material mixture layer.

Negative electrode for lithium ion secondary batteries and method for producing the negative electrode, and lithium ion secondary battery

A negative electrode for a lithium ion secondary battery includes a negative electrode core member and a negative electrode mixture layer adhering to the negative electrode core member. The negative electrode mixture layer includes active material particles, a cellulose ether compound, and rubber particles. The cellulose ether compound has a degree of etherification of 0.25 or more and 0.7 or less and an average degree of polymerization of 20 or more and 1200 or less. The negative electrode mixture layer contains remaining particles including a water-insoluble portion of the cellulose ether compound and having a mean particle size of 1 &#x3bc;m or more and 75 &#x3bc;m or less. The bonding strength between the active material particles is 98 N/cmor more.

Negative electrode for lithium ion secondary battery and lithium ion secondary battery including the same

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Hyogo, Japan

Taiki Satow