发明申请
US20210020910A1 POSITIVE ELECTRODE ACTIVE MATERIAL INCLUDING LITHIUM COBALTATE COATED WITH LITHIUM TITANATE AND MAGNESIUM OXIDE
有权
基本信息:
- 专利标题： POSITIVE ELECTRODE ACTIVE MATERIAL INCLUDING LITHIUM COBALTATE COATED WITH LITHIUM TITANATE AND MAGNESIUM OXIDE
- 申请号：US17064724 申请日：2020-10-07
- 公开(公告)号：US20210020910A1 公开(公告)日：2021-01-21
- 发明人： Teruaki OCHIAI , Takahiro KAWAKAMI , Mayumi MIKAMI , Yohei MOMMA , Masahiro TAKAHASHI , Ayae TSURUTA
- 申请人： SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
- 申请人地址： JP Atsugi-shi
- 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
- 优先权： JP2016-133143 20160705,JP2016-133997 20160706,JP2017-002831 20170111,JP2017-030693 20170222,JP2017-084321 20170421,JP2017-119272 20170619
- 主分类号： H01M4/134
- IPC分类号： H01M4/134 ; H01M4/131 ; H01M4/525 ; H01M4/36 ; H01M10/0525
摘要：
A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.
公开/授权文献:
IPC结构图谱:
| H | 电学 |
| --H01 | 基本电气元件 |
| ----H01M | 用于直接转变化学能为电能的方法或装置，例如电池组 |
| ------H01M4/00 | 电极 |
| --------H01M4/02 | .由活性材料组成或包括活性材料的电极 |
| ----------H01M4/06 | ..一次电池的电极 |
| ------------H01M4/134 | ...基于金属、硅或合金的电极 |