摘要:
[Summary] Provided is a cathode active material for a lithium secondary battery having a layered rock salt structure, including a secondary grain formed of a large number of primary grains each having an average grain size of 0.01 μm or more and 5 μm or less, in which the secondary grain has the following characteristics: a (003) plane orientation degree of 60% or more; an average grain size of 1 μm or more and 100 μm or less; an aspect ratio of 1.0 or more and less than 2; a voidage of 3% or more and 30% or less; an average pore size of 0.1 μm or more and 5 μm or less; and a value obtained by dividing the average grain size of each of the primary grains by the average pore size of 0.1 or more and 5 or less.
摘要:
An actuator includes a first electrode disposed on the top surface of a ceramic substrate (for example, zirconium oxide), a piezoelectric/electrostrictive substance disposed on the first electrode, and a second electrode disposed on the piezoelectric/electrostrictive substance, wherein the input of an electric power alters the volume of the piezoelectric/electrostrictive substance. The piezoelectric/electrostrictive substance contains a plurality of crystal grains that have a wavy structure composed of wavy grain boundaries including concave portions and convex portions. The crystal grains contain ABO3 as the main component. The A site is Pb, and the B site contains such an amount of M that M becomes excessive after the piezoelectric/electrostrictive substance is formed (wherein M is at least one element selected from Mg, Ni, and Zn). The crystal grains of the piezoelectric/electrostrictive substance are oriented in the electric field direction, independently of the orientation of the substrate.
摘要:
A positive electrode active material containing a large number of crystal grains which contain, by 70 areal % or more, primary particles of non-octahedral shape, having particle diameters of 5 to 20 μm, and composed of lithium manganate of spinel structure containing lithium and manganese as the constituent elements.
摘要:
An actuator includes a fired ceramic substrate having a space opened downward, a first electrode formed on the upper surface of the fired ceramic substrate above the space, a piezoelectric/electrostrictive body formed on the first electrode so that the volume changes with input and output of electric power, and a second electrode formed on the piezoelectric/electrostrictive body. The piezoelectric/electrostrictive body is composed of Pb(Zr1-xTix)O3 or (Li, Na, K) (Nb, Ta)O3 as a main component and contains crystals oriented along the direction of an electric field. In the actuator, the degree of orientation of the piezoelectric/electrostrictive body can be increased regardless of the orientation of the substrate on which the piezoelectric/electrostrictive body is formed.
摘要:
A positive electrode active material comprising a large number of crystal grains composed of lithium manganate of spinel structure, wherein the large number of crystal grains contain primary particles of 3 to 20 μm in particle diameter by 70 areal % or more relative to all the crystal grains, the primary particles contain a component having a rectangular plane, and the ratio of the total area of all the rectangular planes to the total surface area of the primary particles is 0.5 to 5%.
摘要:
An actuator includes a fired ceramic substrate having a space opened downward, a first electrode formed on the upper surface of the fired ceramic substrate above the space, a piezoelectric/electrostrictive body formed on the first electrode so that the volume changes with input and output of electric power, and a second electrode formed on the piezoelectric/electrostrictive body. The piezoelectric/electrostrictive body is composed of Pb(Zr1-xTix)O3 or (Li, Na, K) (Nb, Ta)O3 as a main component and contains crystals oriented along the direction of an electric field. In the actuator, the degree of orientation of the piezoelectric/electrostrictive body can be increased regardless of the orientation of the substrate on which the piezoelectric/electrostrictive body is formed.
摘要:
A manufacturing method of the present invention includes (a) a material preparation step of preparing a material containing lithium, manganese, and bismuth, and (b) a firing step of firing the material prepared by the material preparation step at a temperature of 830° C. to 1,000° C. In the material preparation step, the material is prepared such that the residual amount of bismuth in spinel-type lithium manganate yielded by the firing step is 0.01 mol % or less with respect to manganese.
摘要:
A crystallographically-oriented ceramic containing Pb and in which piezoelectric/electrostrictive properties can be enhanced. Using a raw material having Pb(Zr1-xTiX)O3 as a main component, a ceramic sheet was formed with a thickness of 15 μm or less. In this material, grains were allowed to grow into an anisotropic shape, and crystal grains with specific crystal planes being aligned were produced. A non-oriented raw material having Pb(Zr1-xTiX)O3 as a main component and the crystal grains were mixed, and shaping was performed so that crystal grains were oriented in a predetermined direction. The shaped body was fired. In the resulting ceramic, the degree of orientation was high at 50% or more. It is possible to enhance the degree of orientation using, as crystal nuclei, a ceramic sheet which can have the same composition as that of the crystallographically-oriented ceramic. Therefore, production can be performed without adding an unnecessary element, for example, for orienting crystals.
摘要:
The production method of the present invention includes (A) a raw material preparation step of preparing a raw material mixture containing at least a manganese compound; (B) a forming step of forming the raw material mixture prepared through the raw material preparation step into a compact having a longitudinal size L and a maximum size R as measured in a direction perpendicular to the longitudinal direction (i.e., in a thickness direction) such that L/R is 3 or more; (C) a firing step of firing the compact obtained through the forming step; and (D) a crushing step of crushing the fired compact obtained through the firing step.
摘要:
A positive electrode active material containing a large number of crystal grains which contain, by 70 areal % or more, primary particles of non-octahedral shape, having particle diameters of 5 to 20 μm, and composed of lithium manganate of spinel structure containing lithium and manganese as the constituent elements.