基本信息:
- 专利标题： POSITIVE ELECTRODE ACTIVE MATERIAL, SECONDARY BATTERY, AND VEHICLE
- 申请号：US17781178 申请日：2020-11-25
- 公开(公告)号：US20230006203A1 公开(公告)日：2023-01-05
- 发明人： Yuji IWAKI , Tatsuyoshi TAKAHASHI , Yohei MOMMA , Shunpei YAMAZAKI
- 申请人： SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
- 申请人地址： JP ATSUGI-SHI, KANAGAWA-KEN
- 专利权人： SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
- 当前专利权人： SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
- 当前专利权人地址： JP ATSUGI-SHI, KANAGAWA-KEN
- 优先权： JP2019-219306 20191204,JP2020-009008 20200123
- 国际申请： PCT/IB2020/061112 WO 20201125
- 主分类号： H01M4/525
- IPC分类号： H01M4/525 ; C01G51/00 ; B60L50/64
摘要：
As for a secondary battery using lithium cobalt oxide as a positive electrode active material, the positive electrode active material with which a decrease in battery capacity due to repeated charge and discharge is inhibited is provided. Alternatively, a positive electrode active material particle which hardly deteriorates is provided. The positive electrode active material includes lithium, cobalt, oxygen, magnesium, aluminum, and fluorine and is a crystal represented by a layered rock-salt structure. The space group of the crystal is represented by R−3m. The concentration of fluorine in a surface portion of the crystal is higher than that inside the crystal. The concentration of magnesium in the surface portion of the crystal is higher than that inside the crystal. The atomic ratio of magnesium to aluminum in the surface portion of the crystal is higher than that inside the crystal.