Nissan Motor Company Limited

Envision Aesc Japan Ltd.

Automotive Energy Supply Corporation

Fumihiro Kawamura

Osamu Shimamura

Kousuke Hagiyama

Manabu Nishijima

Kenji Ohara

Yoshiaki Nitta

Masanori Aoyagi

Manabu Kaseda

Tamaki Hirai

Kuniharu Nomoto

Yuji Muroya

Masanori Suenaga

Takashi Honda

Shigeo Ibuka

Satoru Ichikawa

Gentaro Kano

Masahiro Takaya

Ikuma Matsuzaki

Keisuke Matsumoto

Yuki Kusachi

Takeshi Miyamoto

Kazuki Miyatake

Shin Tanaka

Ryuuta Yamaguchi

Kosuke Hagiyama

Junko Nishiyama

Ryuta Yamaguchi

Sayaka Yonehara

Provided is a hybrid electric vehicle in which, in accordance with the system side of the vehicle including a fuel economy-emphasized system, a wide use-range of the SOC of a lithium ion secondary battery cell can be utilized.

Hybrid electric vehicle, and lithium ion secondary battery cell selection method for hybrid electric vehicle

A non-aqueous electrolyte secondary battery with improved cycle durability includes a power generating element including a positive electrode obtained by forming a positive electrode active material layer containing a positive electrode active material on a surface of a positive electrode current collector, a negative electrode obtained by forming a negative electrode active material layer containing a negative electrode active material on a surface of a negative electrode current collector, and a separator, a ratio of a rated capacity to a pore volume of the separator being 1.55 Ah/cc or more, a ratio of a battery area to a rated capacity being 4.0 cm/Ah or more, and a rated capacity being 30 Ah or more, wherein a variation in porosity in the separator is 4.0% or less.

Non-aqueous electrolyte secondary battery

A flat stacked type non-aqueous electrolyte secondary battery includes: a positive electrode comprising a a positive electrode active material formed on a surface of a positive electrode current collector, a negative electrode comprising a negative electrode active material formed on a surface of a negative electrode current collector, and an electrolyte layer, wherein a ratio of a rated capacity to a pore volume of the negative electrode active material layer is 1.12 Ah/cc or more, a ratio of a battery area to a rated capacity is 4.0 cm/Ah or more, and a rated capacity is 30 Ah or more, and the electrolyte layer contains an electrolyte solution containing an electrolyte salt dissolved and a value obtained by dividing a weight of an electrolyte salt in pores in the negative electrode active material layer by a weight of the negative electrode active material is 0.031 or more.

A non-aqueous electrolyte secondary battery has improved battery durability, a high capacity, a high density, and a large area and includes a power generating element including a positive electrode in which a positive electrode active material layer containing a positive electrode active material is formed on a surface of a positive electrode current collector, a negative electrode in which a negative electrode active material layer containing a negative electrode active material is formed on a surface of a negative electrode current collector, and a separator, a ratio of a rated capacity to a pore volume of the negative electrode active material layer being 1.12 Ah/cc or more, a ratio of a battery area to a rated capacity being 4.0 cm/Ah or more, and a rated capacity being 30 Ah or more, wherein a variation in porosity in the negative electrode active material layer is 6.0% or less.

A method for producing a non-aqueous electrolyte secondary battery including an electrolyte containing an electrolyte salt, a non-aqueous solvent capable of dissolving the electrolyte salt, and plural additives, wherein at least one of the additives has a reduction potential that is nobler than the reduction potential of the non-aqueous solvent. The method includes a first charging step for maintaining battery voltage at a negative electrode potential at which the additive having the noblest reduction potential of the additives is decomposed while the non-aqueous solvent and other additives are not reduced and decomposed and a second charging step for maintaining battery voltage so as to have reduction and decomposition of at least one of the non-aqueous solvents and bring the electrical potential of the negative electrode to at least 0.7 V relative to lithium. By having a uniform reaction in an electrode, a decrease in durability is suppressed.

Method for producing non-aqueous electrolyte secondary battery

The present invention provides a non-aqueous electrolyte secondary battery with various improved battery characteristics and a method for manufacturing such a non-aqueous electrolyte secondary battery. In the present invention, the battery manufacturing method includes accommodating and sealing a flat battery element () in which a positive electrode plate () and a negative electrode plate () stacked together via a separator (), together with a non-aqueous electrolyte including a surplus electrolyte and at least one kind of electrolyte additive, in a laminate film exterior member (), and then, subjecting the thus-assembled battery () to charging operation including at least initial charging in a state where a pressure is applied to a flat surface of the battery element from the outside of the exterior member ().

Nonaqueous electrolyte secondary battery and method for manufacturing same

A non-aqueous electrolyte secondary battery, when using an aqueous binder as a binder for a negative electrode active material, effectively exhausts the gas generated from an electrode, and thus, even when using it for a long period of time, a decrease in battery capacity is low. The non-aqueous electrolyte secondary battery includes a positive electrode active material layer on a surface of a positive electrode current collector, a negative electrode active material layer comprising an aqueous binder on a surface of a negative electrode current collector, a separator for maintaining an electrolytic solution, and a gas releasing means for releasing a gas generated within the power generating element to an extra space inside of the outer casing, and in which the ratio value of a volume of the extra space to a volume of pores included in the power generating element is 0.5 to 1.0.

[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 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:

Growing community of inventors

Kanagawa, Japan

Fumihiro Kawamura