公开(公告)号：US20250149654A1

公开(公告)日：2025-05-08

申请号：US18836867

申请日：2023-02-07

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuta Nishimori ,  Yoshinori Satou ,  Takashi Sasaki ,  Maho Harada ,  Takahito Nakayama

IPC: H01M10/42 ,  H01M4/02 ,  H01M4/131 ,  H01M4/36 ,  H01M4/525 ,  H01M4/62 ,  H01M10/0525

Abstract: A secondary battery includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a lithium-ion conductive electrolyte. The positive electrode includes a positive electrode current collector, and a positive electrode active material layer. The positive electrode active material layer contains a first metal oxide including a lithium-containing transition metal oxide that is a positive electrode active material, and a different second metal oxide. A metal element M contained in the second metal oxide includes an atom m1 and an atom m2 that are the same element having different valences from each other. The metal element M is at least one metal element selected from the group consisting of Al, Ti, Si, Zr, Mg, Nb, Ta, Sn, Ni, V, and Cr. An oxide of the atom m1 and the atom m2 are different in temperature dependence of electrical resistance.

公开(公告)号：US20250054982A1

公开(公告)日：2025-02-13

申请号：US18720824

申请日：2022-12-20

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Maho Harada ,  Takahito Nakayama

IPC: H01M4/62 ,  H01M4/02 ,  H01M4/04 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/525

Abstract: A positive electrode for a secondary battery including a positive electrode current collector, and a positive electrode active material layer supported on the positive electrode current collector. The positive electrode active material layer contains active material particles, a binder, and a thermal decomposable additive, and the thermal decomposable additive includes an acetamidobenzoic acid.

公开(公告)号：US20250132327A1

公开(公告)日：2025-04-24

申请号：US18836491

申请日：2023-02-07

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yoshinori Satou ,  Yuta Nishimori ,  Maho Harada ,  Takahito Nakayama

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

Abstract: A positive electrode material for a secondary battery includes a secondary particle that is an aggregate of a plurality of primary particles. The primary particles contain a first metal oxide as a positive electrode active material. The primary particles include first primary particles disposed at a surface of the secondary particle, second primary particles disposed inside the secondary particle in contact with the first primary particles, and third primary particles disposed inside the secondary particle not in contact with the first primary particles. The positive electrode material further includes a second metal oxide attached at least to surfaces of the first primary particles and the second primary particles and having a composition different from the first metal oxide. The second metal oxide is not attached to surfaces of the third primary particles, or an amount attached thereto is smaller than an amount attached to the second primary particles.

公开(公告)号：US20250038196A1

公开(公告)日：2025-01-30

申请号：US18721356

申请日：2022-12-22

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Maho Harada ,  Takahito Nakayama

IPC: H01M4/525 ,  H01M4/02 ,  H01M4/04 ,  H01M4/36 ,  H01M4/62 ,  H01M10/052

Abstract: A positive electrode for a secondary battery including a positive electrode current collector, and a positive electrode active material layer supported on the positive electrode current collector. The positive electrode active material layer contains active material particles, a binder, and a thermal decomposable additive. The thermal decomposable additive includes a sulfamic acid. The binder includes at least one selected from the group consisting of a fluorocarbon resin and a hydrogenated nitrile butadiene rubber.