公开(公告)号：US11367903B2

公开(公告)日：2022-06-21

申请号：US16582141

申请日：2019-09-25

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Naoya Morisawa ,  Kazuhiro Iida ,  Masaki Deguchi ,  Atsushi Fukui

IPC: H01M10/00 ,  H01M10/0569 ,  H01M4/1315 ,  H01M4/02

Abstract: A nonaqueous electrolyte solution according to one embodiment of the present disclosure contains a lithium salt and a nonaqueous solvent; the nonaqueous solvent contains fluoroethylene carbonate and a chain carboxylic acid ester having a dielectric constant of 6.0 or more; the lithium salt contains LiPO2F2 and LiSO3F; and the respective concentrations of LiPO2F2 and LiSO3F in the non-aqueous solvent are 0.15 mol/L or more.

公开(公告)号：US20220013780A1

公开(公告)日：2022-01-13

申请号：US17295513

申请日：2019-11-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Satoshi Nishitani ,  Masaki Deguchi

IPC: H01M4/58 ,  H01M4/38 ,  H01M4/583 ,  H01M10/0562

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolyte. The negative electrode includes a negative electrode active material capable of electrochemically absorbing and releasing lithium ions, and the negative electrode active material includes a first composite material containing a silicate phase and silicon particles dispersed in the silicate phase. The silicate phase includes at least one of an alkali metal and an alkaline earth metal. The content of the silicon particles in the first composite material is 30 mass % or more and 80 mass % or less. The electrolyte includes lithium fluorosulfonate.

公开(公告)号：US20200091500A1

公开(公告)日：2020-03-19

申请号：US16471944

申请日：2017-12-20

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Satoshi Nishitani ,  Hiroshi Minami ,  Masaki Deguchi

IPC: H01M4/131 ,  H01M4/134 ,  H01M4/38 ,  H01M4/485 ,  H01M4/62 ,  H01M4/36 ,  H01M4/587 ,  H01M4/133 ,  H01M10/0567 ,  H01M10/0525

Abstract: A positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode includes a negative electrode material, a binder, and a thickener, and the negative electrode material includes a lithium silicate phase, and Si particles dispersed in the lithium silicate phase. The ratio of the Si particles in the negative electrode material is 30 mass % or more. The binder includes a poly(meth)acrylic acid, the thickener includes a carboxyalkyl cellulose, and the amount of the poly(meth)acrylic acid relative to 100 parts by mass of the negative electrode material is 0.1 parts by mass or more and 5 parts by mass or less. The non-aqueous electrolyte includes a lithium salt, a non-aqueous solvent, and an acid that exhibits a pKa of 1 to 30 in water at 25° C. The non-aqueous electrolyte secondary battery can suppress the generation of gas during high-temperature storage, and secure excellent cycle characteristics.