公开(公告)号：US20250105260A1

公开(公告)日：2025-03-27

申请号：US18975457

申请日：2024-12-10

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Yasuhiro IKEDA

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/38 ,  H01M4/587 ,  H01M10/0525

Abstract: A negative electrode active material includes a first negative electrode active material particle, and the first negative electrode active material includes a silicon-based material. A Si2p spectrum obtained by measuring the first negative electrode active material particle in a state of 0.6 V (vs. Li/Li+) by X-ray photoelectron spectroscopy has a peak in a range from 99.0 eV to 105.0 eV, and a half width of the peak is 1.5 eV or more and 8.0 eV or less.

公开(公告)号：US20230223522A1

公开(公告)日：2023-07-13

申请号：US18122211

申请日：2023-03-16

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Qin SI ,  Daisuke ITO ,  Yasuhiro IKEDA

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/134 ,  H01M4/58 ,  C01D15/02

CPC classification number: H01M4/366 ,  H01M10/0525 ,  H01M4/134 ,  H01M4/5825 ,  C01D15/02 ,  H01M2004/027

Abstract: A secondary battery includes a positive electrode, a negative electrode including a negative electrode active material, and an electrolytic solution. The negative electrode active material includes a lithium-silicon-containing oxide that includes lithium and silicon as constituent elements and includes magnesium present on a surface layer of the lithium-silicon-containing oxide. The lithium-silicon-containing oxide includes a phase including silicon and a phase including at least one kind of lithium silicate represented by Formula (1). A range in which magnesium is present is within a range of greater than or equal to 10 nm and less than or equal to 3000 nm from a surface of the lithium-silicon-containing oxide in a depth direction. Magnesium forms at least one kind of magnesium silicate represented by Formula (2). A ratio of a number of moles of magnesium to a number of moles of lithium is greater than or equal to 0.1 mol % and less than or equal to 20 mol %,


LiaSibOc  (1)



where a, b, and c satisfy 1≤a≤6, 1≤b≤3, and 1≤c≤7, respectively,






MgxSiyOz  (2)



where x, y, and z satisfy 1≤x≤3, 1≤y≤2, and 1≤z≤4, respectively.

公开(公告)号：US20240347699A1

公开(公告)日：2024-10-17

申请号：US18755064

申请日：2024-06-26

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Yuichi SANO ,  Yasuhiro IKEDA ,  Qin SI ,  Daisuke ITO ,  Yuta KIGUCHI

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/38 ,  H01M4/485

CPC classification number: H01M4/364 ,  H01M4/386 ,  H01M4/485 ,  H01M2004/027

Abstract: A negative electrode active material for a secondary battery includes a negative electrode active material particle that includes a first object including a silicon oxide, and a second object including at least one of copper, a copper compound, tungsten, or a molybdenum oxide and attached to a surface of the first object. A Raman spectrum of the negative electrode active material particle has a maximum peak within a range of greater than or equal to 470 cm−1 and less than or equal to 490 cm−1. An XRD spectrum thereof has a peak within a range of 37°±1° and a peak within a range of 44°±1°, has a peak within a range of 40°±1°, or has a peak within any one of a range of 23°±1°, a range of 25°±1°, a range of 37°±1°, a range of 41°±1°, a range of 54°±1°, or a range of 60°±10.

公开(公告)号：US20200058941A1

公开(公告)日：2020-02-20

申请号：US16535589

申请日：2019-08-08

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Naoki HAYASHI ,  Yasuhiro IKEDA

IPC: H01M4/62 ,  H01M4/60 ,  H01M4/583 ,  H01M4/38

Abstract: A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution, and the negative electrode includes a first negative electrode active substance, a second negative electrode active substance, and a negative electrode binder. The first negative electrode active substance includes a central portion containing a material containing silicon as a constituent element, and a covering portion provided on a surface of the central portion and containing a salt compound and a conductive substance. The salt compound contains at least one of polyacrylate and carboxymethylcellulose salt, and the conductive substance contains at least one of a carbon material and a metal material. The second negative electrode active substance contains a material containing carbon as a constituent element. The negative electrode binder contains at least one type of polyvinylidene fluoride, polyimide, and aramid.