公开(公告)号：US20240413326A1

公开(公告)日：2024-12-12

申请号：US18773850

申请日：2024-07-16

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Shigeki MORIYA ,  Nobuhiro SAKITANI ,  Takaharu MORIKAWA

IPC: H01M4/525 ,  H01M4/02 ,  H01M4/36 ,  H01M4/62 ,  H01M4/66

Abstract: The purpose of the present invention is to provide a winding-type nonaqueous electrolyte secondary battery which is capable of minimizing degradation of charge-discharge cycle characteristics. The winding-type nonaqueous electrolyte secondary battery according to an embodiment of the present invention is provide with a negative electrode that has a negative electrode current collector, an inner-circumference-side negative electrode mixture layer which is disposed, of the two surfaces of the negative electrode current collector, on the inner-circumference-side surface, and an outer-circumference-side negative electrode mixture layer disposed on the outer-circumference-side surface, wherein the inner-circumference-side negative electrode mixture layer and the outer-circumference-side negative electrode mixture layer each include a negative electrode active material and carbon nanotubes, and the carbon nanotubes in the outer-circumference-side negative electrode mixture layer have an average fiber length of 5-30 um, which is longer than that of the carbon nanotubes in inner-circumference-side negative electrode mixture layer.