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1.发明公开
公开(公告)号：EP4328188A1
公开(公告)日：2024-02-28
申请号：EP23188342.2
申请日：2023-07-28
发明人： YAMAMOTO, Yuji , SUZUKI, Shinya
摘要： Provided are particles convertible to a lithium transition metal composite oxide that can reduce an initial resistance of a lithium ion secondary battery. The particles disclosed here are particles convertible to a lithium transition metal composite oxide by firing. Each of the particles includes lithium and a transition metal element. The particles have an average particle size of 2.0 µm or more. In the case of obtaining a reflected electron image of the particles with a scanning electron microscope, a domain observed as a brightest region in the particles has a maximum diameter less than 1 µm.
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公开(公告)号：EP4276941A1
公开(公告)日：2023-11-15
申请号：EP23169775.6
申请日：2023-04-25
发明人： SUZUKI, Shinya , TSUJIKO, Akira
IPC分类号： H01M4/1391 , H01M4/36 , H01M4/525 , H01M4/62 , C01G53/00
摘要： A positive electrode active material (1) disclosed herein includes a Ni content lithium complex oxide (2) containing 70 mol% or more of nickel relative to the total of metal elements other than lithium, and a boron element (4). The Ni content lithium complex oxide (2) is in a form of a secondary particle in which primary particles (2a) are aggregated and has a porosity of 2% or more and 10% or less, and inside the secondary particle, a larger space than an average cross-sectional area of the primary particles (2a) does not exist. The boron element (4) is contained by 0.5 to 3 mol% when the total of metal elements of the Ni content lithium complex oxide (2) is 100 mol%.
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公开(公告)号：EP4276935A1
公开(公告)日：2023-11-15
申请号：EP23169803.6
申请日：2023-04-25
发明人： SUZUKI, Shinya , TSUJIKO, Akira
摘要： A positive electrode (50) of a nonaqueous electrolyte secondary battery (100) disclosed herein includes a positive electrode active material layer (54) with a multilayer structure including a positive electrode lower layer (54A) close to a positive electrode current collector (52) and a positive electrode upper layer (54B) far from the positive electrode current collector (52). The positive electrode lower layer (54A) includes a first positive electrode active material (1) including a first Ni content lithium complex oxide (1A) with a porosity of less than 2%. The positive electrode upper layer (54B) includes a second positive electrode active material (2) including a second Ni content lithium complex oxide (2A) that is in a form of a secondary particle in which primary particles (2p) are aggregated, has a porosity of 2 to 20%, and does not include a larger space than an average cross-sectional area of the primary particles (2p) inside the secondary particle, and a covering element (4). The ratio of the covering element (4) is 0.5 to 3 mol% when the total of metal elements of the second Ni content lithium complex oxide (2A) is 100 mol%.
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