Nissan Motor Company Limited

Envision Aesc Japan Ltd.

Manabu Kaseda

Shigeo Ibuka

Osamu Shimamura

Satoru Ichikawa

Kenji Ohara

Yoshiaki Nitta

Fumihiro Kawamura

Tamaki Hirai

Kenta Uwai

Kousuke Hagiyama

Hiroaki Tanizaki

Gentaro Kano

Masahiro Takaya

Manabu Nishijima

Haruyuki Saito

Kodai Nagano

Kuniharu Nomoto

Masanori Suenaga

Hideaki Horie

Takayuki Fujii

Takashi Honda

Masanori Aoyagi

Yasuyuki Tanaka

Chizuru Matsuyama

Tomoya Kubota

Yukinari Kato

Keisuke Shimamoto

Kana Sato

A current collector for a secondary battery () of the present invention includes a resin layer () having electrical conductivity, and an ion barrier layer () provided on the surface of the resin layer (). The ion barrier layer () contains ion trapping particles () in which metal compounds () are provided on the surfaces of metal containing particles (). The ion trapping particles () are continuously provided from an interface () between the resin layer () and the ion barrier layer () toward a surface () of the ion barrier layer (). Thus, the ion barrier layer () prevents from the entry of ions, so that the ion adsorption in the current collector () can be decreased.

Current collector for secondary battery and secondary battery using the same

[Object] Provided is a means which is capable, with respect to a non-aqueous electrolyte secondary battery, of suppressing a decrease in capacity when the battery is used for a long period of time, and improving cycle characteristics. [Solving Means] Provided is a positive electrode active substance for a non-aqueous electrolyte secondary battery, the positive electrode active substance being a lithium-nickel-manganese-cobalt composite oxide and having true density of 4.40 to 4.80 g/cm.

Positive electrode active substance, positive electrode material, positive electrode, and non-aqueous electrolyte secondary battery

[Object] Provided is a means which is capable, with respect to a non-aqueous electrolyte secondary battery, of suppressing a decrease in capacity when the battery is used for a long period of time, and improving cycle characteristics. [Solving Means] Disclosed is a positive electrode active substance for a non-aqueous electrolyte secondary battery comprising a composite oxide containing lithium and nickel, in which the positive electrode active substance has a structure of secondary particles formed by aggregation of primary particles, the average particle diameter of the primary particles (D1) is 0.9 &#x3bc;m or less, and the ratio value (D2/D1)) of the average particle diameter of the secondary particles (D2) to the average particle diameter of the primary particles (D1) is 11 or more. [Representative Drawing] None

A non-aqueous electrolyte secondary battery (large size cell) that has high output (low resistance) and high capacity makes it possible to improve the cycle characteristics of a battery by controlling the balance of the resistance between positive and negative electrodes. The non-aqueous electrolyte secondary battery has a positive electrode which comprises an active material and a conductive aid, a negative electrode, and an electrolyte layer, and having battery capacity of 3 Ah or more and an absolute value of battery internal resistance of 30 m&#x3a9; or less, in which the non-aqueous electrolyte second battery is characterized in that the zeta (&#x3b6;) potential between the active material and the conductive aid is in the range of 0.3 mV to 2 mV as an absolute value.

Non-aqueous electrolyte secondary battery

[Object] Provided is a means for improving cycle characteristics by suppressing electrode deterioration resulting from non-uniformity of voltage across an electrode plane in a high-capacity and large-area non-aqueous electrolyte secondary battery that includes lithium nickel-based composite oxide as a positive electrode active substance. [Solving Means] Disclosed is a positive electrode for a non-aqueous electrolyte secondary battery used in a non-aqueous electrolyte secondary battery in which the ratio value of battery area (projected area of the battery including the battery outer casing body) to rated capacity is 5 cm/Ah or more and the rated capacity is 3 Ah or more, the positive electrode comprising a positive electrode current collector and a positive electrode active substance layer that is formed on a surface of the positive electrode current collector and has a positive electrode active substance containing a lithium nickel-based composite oxide and a spinel type lithium manganese composite oxide, in which, when the average secondary particle diameter (D50) of the lithium nickel-based composite oxide is D50(A) [&#x3bc;m], the content ratio of the lithium nickel-based composite oxide in the positive electrode active substance layer is A [% by mass], the average secondary particle diameter (D50) of the spinel type lithium manganese composite oxide is D50(B) [&#x3bc;m], and the content ratio of the spinel type lithium manganese composite oxide in the positive electrode active substance layer is B [% by mass], the positive electrode satisfies the following Mathematical Formula 1 and Mathematical Formula 2:

Positive electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using the same

[Object] Provided is a means for improving cycle characteristics by suppressing electrode deterioration resulting from non-uniformity of voltage across an electrode plane in a high-capacity and large-area non-aqueous electrolyte secondary battery that includes lithium nickel-based composite oxide as a positive electrode active substance. [Solving Means] Disclosed is a positive electrode for a non-aqueous electrolyte secondary battery used in a non-aqueous electrolyte secondary battery in which the ratio value of battery area (projected area of the battery including the battery outer casing body) to rated capacity is 5 cm/Ah or more and the rated capacity is 3 Ah or more, the positive electrode comprising a positive electrode current collector and a positive electrode active substance layer that is formed on a surface of the positive electrode current collector and has a positive electrode active substance containing a lithium nickel-based composite oxide and a spinel type lithium manganese composite oxide, in which, when the average secondary particle diameter (D50) of the lithium nickel-based composite oxide is D50(A) [&#x3bc;m], the content ratio of the lithium nickel-based composite oxide in the positive electrode active substance layer is A [% by mass], the average secondary particle diameter (D50) of the spinel type lithium manganese composite oxide is D50(B) [&#x3bc;m], and the content ratio of the spinel type lithium manganese composite oxide in the positive electrode active substance layer is B [% by mass], the positive electrode satisfies the following Mathematical Formula 1 and Mathematical Formula 2:[Math. 1]0.5&#x2266;50()/50()&#x2266;2.0&#x2003;&#x2003;MathematicalFormula1:/()&#x2267;0.2&#x2003;&#x2003;MathematicalFormula2:

Disclosed is a positive electrode active substance for a non-aqueous electrolyte secondary battery including a composite oxide containing lithium and nickel, in which the positive electrode active substance has a structure of secondary particles formed by aggregation of primary particles. The average particle diameter of the primary particles (D1) is 0.9 &#x3bc;m or less. The average particle diameter of the primary particles (D1) and the standard deviation (&#x3c3;) of the average particle diameter of the primary particles (D1) meet the relationship of D1/&#x3c3;&#x2267;24.

[Object] Provided is a means capable of suppressing a decrease in capacity and improving output characteristics of a non-aqueous electrolyte secondary battery when the battery is used for a long period of time. [Solving Means] Disclosed is a positive electrode active substance for a non-aqueous electrolyte secondary battery, in which the true density/tap density of secondary particles of a lithium composite oxide containing nickel as the main component is within the range of 1.6 to 2.3, and in the secondary particles, the average porosity on the center side of the half (R/2 [&#x3bc;m]) of the particle radius (R) of D50 of the secondary particles is larger than the average porosity on the surface side.

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Yokohama, Japan

Manabu Kaseda