Lithium ion secondary battery
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsJunji Nakajima, Tsumoru Ohata, Takashi Takano, Kohei Suzuki, Tetsuya Hayashi
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Abstract
A lithium ion secondary battery comprising: a positive electrode, a negative electrode, a separator interposed between the positive and negative electrodes, and an electrolyte prepared by dissolving a lithium salt in a non-aqueous solvent, wherein the separator comprises a porous film layer containing basic solid particles and a composite binder, the porous film layer is adhered to at least one surface of at least one of the positive and negative electrodes, the composite binder comprises a primary binder and a secondary binder, the primary binder comprises polyether sulfone and the secondary binder comprises polyvinylpyrrolidone.
Claims6
A lithium ion secondary battery comprising:
- (a) a positive electrode;
- (b) a negative electrode;
- (c) a separator interposed between said positive electrode and said negative electrode;
- and
- (d) an electrolyte comprising a lithium salt and a non-aqueous solvent dissolving said lithium salt,
- wherein said separator comprises a porous film layer, said porous film layer comprising basic solid particles and a composite binder, and being adhered to at least one surface of at least one of said positive electrode and said negative electrode,
- said composite binder comprises a primary binder and a secondary binder,
- said primary binder comprises polyether sulfone and
- said secondary binder comprises polyvinylpyrrolidone.
Dependencies are inferred from the claim text.