Lithium Secondary Battery
OwnerHideharu Takezawa, Shinji Kasamatsuinventors
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Abstract
A high capacity lithium secondary battery with excellent safety is provided by suppressing expansion of a negative electrode active material during charge and increasing the content of a heat-resistant resin in a separator relative to conventional one. The lithium secondary battery includes: a negative electrode active material that comprises compound particles containing at least one metal element selected from the group consisting of Si, Sn, Al, and Zn; and a separator that has a first porous layer comprising polyolefin and a second porous layer comprising a heat-resistant resin. The separator contains 10 to 60 parts by weight of the second porous layer per 100 parts by weight of the first porous layer.
Claims14
A lithium secondary battery comprising:
- a positive electrode comprising a positive electrode active material;
- a negative electrode comprising a negative electrode active material;
- a separator interposed between said positive electrode and said negative electrode;
- and a non-aqueous electrolyte,
- wherein said negative electrode active material comprises a compound containing at least one metal selected from the group consisting of Si, Sn, Al, and Zn,
- said separator has a first porous layer comprising polyolefin and a second porous layer comprising a heat-resistant resin, and
- said separator includes 10 to 60 parts by weight of said second porous layer per 100 parts by weight of said first porous layer.
Dependencies are inferred from the claim text.