公开(公告)号：US20210288308A1

公开(公告)日：2021-09-16

申请号：US17333664

申请日：2021-05-28

申请人： MURATA MANUFACTURING CO., LTD.

发明人： Takaaki Matsui ,  Futoshi Sato ,  Keitaro Kitada ,  Taichi Katsumoto ,  Takuma Kawahara ,  Yuta Hirano ,  Taichi Kogure ,  Kazuki Honda ,  Shinji Hatake ,  Takashi Sato ,  Naoko Yamakawa

IPC分类号： H01M4/131 ,  H01M4/133 ,  H01M10/0525 ,  H01M10/0565 ,  H01M10/0566 ,  H01M4/525 ,  H01M4/587

摘要： A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer including a lithium-cobalt composite oxide. The lithium-cobalt composite oxide has a layered rock-salt crystal structure. The negative electrode includes a negative electrode active material layer including graphite. When the secondary battery is charged and discharged with an upper limit of a closed circuit voltage being set to 4.42 V or higher, a unit capacity (mAh/g) satisfies a condition represented by 168 mAh/g≤unit capacity (mAh/g)≤(−0.28×area rate (%)+178) mAh/g.

公开(公告)号：US10727530B2

公开(公告)日：2020-07-28

申请号：US15997934

申请日：2018-06-05

申请人： MURATA MANUFACTURING CO., LTD.

发明人： Tadashi Matsushita ,  Yuya Akiyama ,  Atsushi Ouki ,  Takashi Sato ,  Masaki Kuratsuka

IPC分类号： H01M4/36 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/505 ,  H01M2/04 ,  H01M2/14 ,  H01M4/38 ,  H01M4/583 ,  H01M10/0587 ,  H01M4/02

摘要： A positive electrode includes first active material particles, second active material particles, and third active material particles, and the second active material particles include an aggregation of second primary particles. The average particle size D1 of the first active material particles, the average particle size D2 of the second active material particles, and the average particle size D3 of the third active material particles satisfy a relationship of D1>D2>D3. A first particle disintegration rate α1 of the first active material particle and a third particle disintegration rate α2 of the third active material particle are not more than 20%, and a second particle disintegration rate β of the second active material particle is not less than 70%.

公开(公告)号：US12095118B2

公开(公告)日：2024-09-17

申请号：US17171509

申请日：2021-02-09

申请人： MURATA MANUFACTURING CO., LTD.

发明人： Takaaki Matsui ,  Kazuki Honda ,  Rikako Imoto ,  Hideki Nakai ,  Takashi Sato

IPC分类号： H01M50/538 ,  H01M4/02 ,  H01M4/133 ,  H01M4/134 ,  H01M4/38 ,  H01M4/66 ,  H01M10/0525

CPC分类号： H01M50/538 ,  H01M4/133 ,  H01M4/134 ,  H01M4/386 ,  H01M4/661 ,  H01M10/0525 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2220/20

摘要： A secondary battery includes a wound electrode body. The wound electrode body includes a positive electrode, a negative electrode, and a separator. The positive electrode and the negative electrode are stacked on each other with the separator interposed therebetween and are wound about a winding axis. The wound electrode body has a section perpendicular to the winding axis. The section has an elongated shape that includes a flat part and a pair of curved parts. The curved parts oppose each other with the flat part interposed therebetween. The negative electrode includes a negative electrode current collector and a negative electrode active material layer provided on the negative electrode current collector. A width of the wound electrode body, a wound-layer number of the wound electrode body, and a ratio of a second distance to a first distance satisfy at least one of Condition A and Condition B.