公开(公告)号：US20240290966A1

公开(公告)日：2024-08-29

申请号：US18569130

申请日：2022-05-31

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuanlong Zhong ,  Shohei Watarigawa

IPC: H01M4/525 ,  H01M4/02 ,  H01M10/0567

CPC classification number: H01M4/525 ,  H01M10/0567 ,  H01M2004/028

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material, the positive electrode active material includes a lithium-transition metal composite oxide containing Ni, Mn, and Al, and the proportions of Ni, Mn, and Al in metal elements other than Li contained in the lithium-transition metal composite oxide are, respectively, Ni: 50 atm % or more, Mn: 10 atm % or less, and Al: 10 atm % or less. When the lithium-transition metal composite oxide contains Co, the proportion of Co in the metal dements other than Li is 1.5 atm % or less. The nonaqueous electrolyte includes an organophosphorus compound represented by a general formula (1). In the general formula (1), R1 and R2 are each independently an alkyl group with 1 to 4 carbon atoms, and R3 is a fluorinated alkyl group with 1 to 4 carbon atoms.

公开(公告)号：US20250006997A1

公开(公告)日：2025-01-02

申请号：US18695596

申请日：2022-09-20

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Shohei Watarigawa

IPC: H01M10/0569 ,  H01M4/36 ,  H01M4/38 ,  H01M4/587 ,  H01M10/052 ,  H01M10/0567 ,  H01M10/0568

Abstract: In a non-aqueous electrolyte secondary battery, a negative electrode active material included in a negative electrode includes composite particles including a silicon phase dispersed in a matrix phase. The non-aqueous electrolyte includes a heterocyclic compound represented by the following formula (I), and a fluorine-containing cyclic carbonate. (In the formula, X1, X2, and X3 are each an oxygen element or a sulfur element, and R1, R2, and R3 are each an alkyl group having 1 to 5 carbon atoms.