Patent ID: 7550232

Claim:
A lithium-ion rechargeable battery, comprising: a positive electrode capable of absorbing and desorbing lithium ions; a negative electrode capable of absorbing and desorbing lithium ions; a separator interposed between said positive electrode and said negative electrode; and a non-aqueous electrolyte, wherein said negative electrode comprises a negative electrode current collector and a negative electrode material mixture layer carried on said negative electrode current collector, said negative electrode material mixture layer comprises graphite and carbon nano-tubes, said graphite being adhered with carbonized pitch, and an amount of said carbon nano-tubes in said negative electrode material mixture layer is not smaller than 1 part by weight and not larger than 10 parts by weight, per 100 parts by weight of said graphite, wherein said carbon nano-tubes have an average fiber diameter of 50 μm or smaller, and an average fiber length of 5 μm or smaller.