摘要:
An object of the present invention is to realize more effective intercalation and deintercalation of lithium ions in a cathode active material. The preset invention provides a cathode active material plate-like particle for a lithium secondary battery, the particle having a layered rock salt structure, wherein lithium-intercalation/deintercalation-plane-oriented grains (primary crystal grains whose (003) plane is oriented so as to intersect a plate surface of the plate-like particle) are present in a dispersed state among numerous (003)-plane-oriented grains (primary crystal grains whose (003) plane is oriented in parallel with the plate surface of the plate-like particle).
摘要:
A ceramic sheet is self-supported and planar and has a thickness of 10 μm or less, wherein a surface of the sheet includes a specific crystal plane, and the number of crystal grains present in the thickness direction of the sheet at any one point is substantially one. Preferably, the aspect ratio of the crystal grains is 3 or more, and the degree of orientation measured by the Lotgering method is 30% or more. The crystal grains may be composed of an oxide represented by general formula ABO3, wherein the A site contains at least one element selected from the group consisting of Li, Na, K, Bi, and Ag, and the B site contains at least one element selected from the group consisting of Nb, Ta, and Ti. The crystal grains may be composed of an oxide having a perovskite structure and an isotropic shape.
摘要:
The cathode active material precursor particle, which forms, through incorporation of lithium thereinto, a cathode active material particle for use in a lithium secondary battery, the cathode active material particle containing a lithium complex oxide having a layered rock salt structure, is characterized in that the precursor particle has an aspect ratio, which is a ratio of long axis diameter to short axis diameter, of 1.0 or more and less than 2 and is formed so that the (003) planes of the lithium-incorporated cathode active material particle are substantially uniaxially oriented.
摘要:
The lithium secondary battery cathode active material having a layered rock salt structure is characterized in that the material is formed of a plurality of primary particles having a mean particle size of 0.01 to 5 μm, and contains secondary particles having a mean particle size of 1 to 100 μm and an aspect ratio, which is a ratio of long axis diameter to short axis diameter, of 1.0 or more and less than 2; and that the primary particles forming the secondary particles have a (003) plane orientation degree of 50% or higher.
摘要:
The invention provides lithium secondary battery cathode active material particle, which is formed as a secondary particle that is a mass of a plurality of single-crystal primary particles of a lithium-nickel-based complex oxide having a layered rock salt structure, wherein the primary particles have a mean particle size of 0.01 to 5 μm, and the secondary particle has an aspect ratio, which is a ratio of long axis diameter to short axis diameter, of 1.0 or more and less than 2 and a mean particle size of 1 to 100 μm, wherein the (003) planes of the second particle are substantially uniaxially oriented.
摘要:
A plate-like polycrystalline particle is produced by forming inorganic particles into a self-supported, sheet-like shaped body with a predetermined thickness, firing the shaped body, and crushing and classifying the fired shaped body by passing through a mesh having openings with a predetermined size. The inorganic particles are composed of an oxide having a perovskite structure and grow into crystal grains with an isotropic and polyhedral shape. Since grain growth in the thickness direction is limited and grain growth in the surface direction of the sheet is promoted, it is possible to obtain crystal grains having a high aspect ratio and a high degree of orientation. Therefore, in the plate-like polycrystalline particle, in most parts, the number of crystal grains present in the thickness direction of the particle at any one point is one, and a high aspect ratio and a high degree of orientation are achieved.