公开(公告)号：US20220037643A1

公开(公告)日：2022-02-03

申请号：US17275247

申请日：2019-09-10

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yasunobu Iwami ,  Nobumichi Nishida ,  Takaharu Morikawa ,  Mai Yokoi ,  Toshiyuki Nakamori

IPC: H01M4/36 ,  H01M4/133 ,  H01M4/134 ,  H01M4/136 ,  H01M4/38 ,  H01M4/48 ,  H01M4/58 ,  H01M4/587 ,  H01M10/0525

Abstract: The purpose of the present invention is to provide a nonaqueous electrolyte secondary battery which has excellent charge/discharge cycle characteristics. A nonaqueous electrolyte secondary battery negative electrode which is an example of an embodiment of the present invention comprises, as negative electrode active materials, a carbon active material and a Si active material comprising Si particles dispersed in an oxide phase containing at least silicon (Si). The Si active material includes a first Si active material and a second Si active material. The first Si active material has a median size on a volume basis that is greater than that of the second Si active material and has an Si particle content that is higher than that of the second Si active material.