LITHIUM ION SECONDARY BATTERY

Organization Name

Panasonic Intellectual Property Management Co., Ltd.

Inventor(s)

LITHIUM ION SECONDARY BATTERY

This abstract first appeared for US patent application 18711307 titled 'LITHIUM ION SECONDARY BATTERY

Original Abstract Submitted

A negative electrode of this lithium ion secondary battery comprises a negative electrode collector and a negative electrode mixture layer that is formed on the surface of the negative electrode collector; the thickness of the negative electrode collector is 4 μm to 12 μm; the 1% proof stress of the negative electrode collector is 300 MPa to 700 MPa; the negative electrode mixture laver contains a carbon-based material and a silicon-based material, which serve as negative electrode active materials; the discharge capacity of the negative electrode active materials is 400 mAh/g to 750 mAh/g the carbon-based material contains a carbon-based material A and a carbon-based material B, which have different particle fracture strengths from each other; the particle fracture strength of the carbon-based material A is 5 MPa to 15 MPa; and the particle fracture strength of the carbon-based material B is 25 MPa to 40 MPa.