18773991. LITHIUM SECONDARY BATTERY (Toyota Jidosha Kabushiki Kaisha)

LITHIUM SECONDARY BATTERY

Organization Name

Toyota Jidosha Kabushiki Kaisha

Inventor(s)

Junko Amano of Toyota-shi JP

LITHIUM SECONDARY BATTERY

This abstract first appeared for US patent application 18773991 titled 'LITHIUM SECONDARY BATTERY

Original Abstract Submitted

The lithium secondary battery includes a positive electrode, a separator, a negative electrode, and an electrolytic solution. The negative electrode includes a current collector sheet. The thickness of the current collector sheet is 10 μm to 20 μm. The current collector sheet has a plurality of recessed portions. In each of the recesses, assuming that a diameter on a surface is a, a center-to-center distance with another recess closest to the recess is b, and a depth is d, and assuming that an average value of the diameter a is A, an average value of the center-to-center distance b is B, an average value of the depth d is D, and a thickness of the current collection sheet is C, the following expressions (1), (2), and (3): 0.05≤A≤0.18 (1), B≤0.18 (2), and D/C≥3/5 (3) are satisfied.