公开(公告)号：US20230231133A1

公开(公告)日：2023-07-20

申请号：US17998946

申请日：2021-05-18

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： KENICHI NAGAMITSU ,  NOBUHIRO SHIMAMURA

IPC: H01M4/587 ,  H01M10/0525 ,  H01M10/0562 ,  H01M4/133 ,  H01G11/42 ,  H01G11/66 ,  H01G11/58

CPC classification number: H01M4/587 ,  H01M10/0525 ,  H01M10/0562 ,  H01M4/133 ,  H01G11/42 ,  H01G11/66 ,  H01G11/58 ,  H01M2300/008 ,  H01M2004/021

Abstract: An electrochemical device includes a positive electrode, a negative electrode, and an electrolyte having lithium ion conductivity. The positive electrode includes a positive current collector and a positive electrode mixture layer supported on the positive current collector. The positive electrode mixture layer contains a positive electrode active material reversibly doped with an anion. The negative electrode includes a negative current collector and a negative electrode mixture layer supported on the negative current collector. The negative electrode mixture layer contains a negative electrode active material reversibly doped with lithium ions. The negative electrode active material contains non-graphitizable carbon. A ratio Mp/Mn of a mass Mp of the positive electrode active material supported on a unit area of the positive electrode to a mass Mn of the negative electrode active material supported on a unit area of the negative electrode is in a range from 1.1 to 2.5, inclusive.

公开(公告)号：US20240282912A1

公开(公告)日：2024-08-22

申请号：US18548892

申请日：2022-03-17

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： NOBUHIRO SHIMAMURA ,  KENICHI NAGAMITSU

IPC: H01M4/133 ,  H01M4/02 ,  H01M4/587 ,  H01M4/62 ,  H01M10/0525

CPC classification number: H01M4/133 ,  H01M4/587 ,  H01M4/625 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/027

Abstract: The present disclosure provides a high-output electrochemical device with a low internal resistance, the electrochemical device including a positive electrode, a negative electrode, and an electrolyte having lithium ion conductivity. The negative electrode includes a negative current collector and a negative electrode mixture layer supported on the negative current collector. The negative electrode mixture layer contains a conductive additive and a negative electrode active material reversibly doped with a lithium ion. A surface area A per unit mass of the negative electrode mixture layer and a mass B of the negative electrode mixture layer supported on a unit area of the negative current collector on one surface satisfy a relationship of 200≤AB≤1,400.

公开(公告)号：US20240170670A1

公开(公告)日：2024-05-23

申请号：US18548894

申请日：2022-03-17

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： NOBUHIRO SHIMAMURA ,  KENICHI NAGAMITSU ,  TOUGO ENDOU

IPC: H01M4/587 ,  H01M4/02 ,  H01M4/62 ,  H01M10/42

CPC classification number: H01M4/587 ,  H01M4/622 ,  H01M10/4235 ,  H01M2004/027 ,  H01M2300/0065

Abstract: The electrochemical device includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. The negative electrode includes a negative electrode mixture layer, the negative electrode mixture layer contains a binding agent and a negative electrode active material reversibly doped with a lithium ion. The negative electrode active material contains non-graphitizable carbon. An average particle size of the binding agent is more than or equal to 140 nm. In a discharged state, a potential of the negative electrode is less than or equal to +0.2 V with respect to a potential of a Li counter electrode.