Non-Aqueous Electrolyte Secondary Battery
Provided is a means for achieving sufficient charge and discharge cycle characteristics in a non-aqueous electrolyte secondary battery having a large capacity and a large area even when a mixture of a high-capacity Si material and a carbon material having small expansion is used as a negative electr...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | Provided is a means for achieving sufficient charge and discharge cycle characteristics in a non-aqueous electrolyte secondary battery having a large capacity and a large area even when a mixture of a high-capacity Si material and a carbon material having small expansion is used as a negative electrode active material. A non-aqueous electrolyte secondary battery which has a ratio value of a battery volume (a product of a projected area of the battery including a battery outer casing body and a thickness of the battery) to a rated capacity of 10 cm 3 /Ah or less and a rated capacity of 3 Ah or more, the battery including:
a power generating element including
a positive electrode comprising a positive electrode active material layer containing a positive electrode active material formed on a surface of a positive electrode current collector,
a negative electrode comprising a negative electrode active material layer containing a negative electrode active material formed on a surface of a negative electrode current collector, and
a separator, wherein
the negative electrode active material layer contains a negative electrode active material represented by the following Formula (1):
± (Si material) + ² (carbon material)(1)
(in the formula, the Si material is one or two or more kinds selected from the group consisting of SiO x that is a mixture of amorphous SiO 2 particles and Si particles (x represents the number of oxygen atoms satisfying an atomic valence of Si) and a Si-containing alloy; the carbon material is one or two or more kinds selected from the group consisting of graphite, non-graphitizable carbon, and amorphous carbon; ± and ² represent % by mass of each component in the negative electrode active material layer; and 80 ¤ ± + ² ¤ 98, 0.1 ¤ ± ¤ 40, and 58 ¤ ² ¤ 97.9 are satisfied), and
when area proportions (%) of the Si material and the carbon material in an area of a field of view of each image of cross-sections of the negative electrode active material layer in a case where a plurality of arbitrary places is selected in a plane of the negative electrode active material layer are designated as S (%) and (100 - S) (%), respectively, a difference between a maximum value and a minimum value of S is within 5%. |
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