公开(公告)号：US20220384793A1

公开(公告)日：2022-12-01

申请号：US17875978

申请日：2022-07-28

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Kazuaki ENDOH ,  Hironobu KUBOTA

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525

Abstract: A secondary battery includes a positive electrode for a secondary battery, a negative electrode, and an electrolytic solution. The positive electrode for a secondary battery includes a positive electrode active material for a secondary battery. The positive electrode active material for a secondary battery includes first particles and second particles. The first particles have a median diameter D50 of greater than or equal to 15 micrometers and less than or equal to 30 micrometers and each include a lithium-containing compound. The second particles have a median diameter D50 of greater than or equal to 1 micrometer and less than or equal to 10 micrometers and each include a center part that includes a lithium-containing compound and a covering part provided on a surface of the center part. The covering part includes, in order from a side closer to the center part, an underlayer and a surface layer. The underlayer includes a reaction product of a first metal alkoxide in which no alkyl group is bonded to a metal atom. The surface layer includes a reaction product of a second metal alkoxide in which the alkyl group is bonded to the metal atom. The reaction product of the second metal alkoxide is bonded to the reaction product of the first metal alkoxide.

公开(公告)号：US20220158186A1

公开(公告)日：2022-05-19

申请号：US17665209

申请日：2022-02-04

Applicant: MURATA MANUFACTURING CO., LTD.

Inventor： Hironobu KUBOTA ,  Kazuaki ENDOH ,  Takeshi HAYASHI ,  Takashi KASASHIMA

IPC: H01M4/525 ,  H01M4/04 ,  H01M4/36 ,  H01M4/505 ,  H01M4/60

Abstract: The present technology provides a positive electrode active material capable of more sufficiently preventing deterioration in cycle characteristics even when the positive electrode active material has a coating based on a metal alkoxide on its surface. The present technology relates to a positive electrode active material for a battery including a positive electrode active material core material and a coating formed on a surface of the positive electrode active material core material, wherein the coating is an organic-inorganic hybrid coating formed of a reactant including at least a first metal alkoxide containing no metal atom-carbon atom bond in one molecule and a second metal alkoxide containing two or more metal atom-carbon atom bonds in one molecule.