NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

Title:

NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

Document Type and Number:

WIPO Patent Application WO/2017/187637

Kind Code:

A1

Abstract:

[Problem] To provide a means for achieving adequate charge/discharge cycle characteristics in a non-aqueous electrolyte secondary battery having large capacity and a large area even when a mixture of a high-capacity Si material and a carbon material that swells little is used as a negative electrode active material. [Solution] A non-aqueous electrolyte secondary battery in which the value of the ratio of the battery volume (the product of the thickness of the battery and the projected area of the battery including a battery exterior body) with respect to the rated capacity is 10 cm3/Ah or less and the rated capacity is 3 Ah or more, said non-aqueous electrolyte secondary battery comprising a power generation element that includes: a positive electrode in which a positive electrode active material layer including a positive electrode active material is formed on the surface of a positive electrode current collector; a negative electrode in which a negative electrode active material layer including a negative electrode active material is formed on the surface of a negative electrode current collector; and a separator. The non-aqueous electrolyte secondary battery is characterized in that: the negative electrode active material layer contains a negative electrode active material represented by formula (1) (in the formula, the Si material is one or more substances selected from the group consisting of Si-containing alloys and SiOx (x represents the number of oxygen atoms satisfying the valence of Si) that is a mixture of amorphous SiO2 particles and Si particles, the carbon material is one or more substances selected from the group consisting of graphite, hardly graphitizable carbon, and amorphous carbon, α and β represent the mass% of the individual components in the negative electrode active material layer, 80 ≤ α + β ≤ 98, 0.1 ≤ α ≤ 40, and 58 ≤ β ≤ 97.9); and when a plurality of discretionary locations within the plane of the negative electrode active material layer are selected and the area ratios (%) of the Si material and the carbon material in the area of the field of view in each of images of a cross section of the negative electrode active material layer are denoted respectively as S (%) and (100-S) (%), the difference between the maximum value and the minimum value of S is within 5%.

Inventors:

YAMAMOTO KENSUKE (JP)
OGIHARA WATARU (JP)
KANO GENTARO (JP)
TANAKA HIDEAKI (JP)
KONDOU YOUICHIROU (JP)
SUZUKI MASAAKI (JP)
TANABE TSUYOSHI (JP)
NAKANO TAKASHI (JP)

Application Number:

PCT/JP2016/063491

Publication Date:

November 02, 2017

Filing Date:

April 28, 2016

Export Citation:

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Assignee:

NISSAN MOTOR (JP)

International Classes:

H01M10/052; H01M4/13; H01M4/36; H01M4/48; H01M4/505; H01M4/525; H01M4/587; H01M50/105; H01M50/119; H01M50/121; H01M50/122; H01M50/126; H01M50/449

Foreign References:

JP2014082139A	2014-05-08
JP2015106563A	2015-06-08

Other References: