6 results about "Porosimetry" patented technology

Provided is a precursor of a positive electrode active material, which enables a positive electrode active material having low resistance to be obtained. A precursor of a positive electrode active material, the precursor comprising secondary particles in which a plurality of primary particles are agglomerated, the primary particles comprising a nickel composite hydroxide, the average pore diameter of the precursor, as determined by mercury porosimetry, being less than 5.80 μm, and the total pore specific surface area being more than 0.11 m 2 / g.

This invention relates to a composition based on Al and Ce in oxide form (composition C1); or based on Al, Ce, and La in oxide form (composition C2), the composition having the following proportions: - CeO2 proportion between 3.0 wt% and 35.0 wt%; - La2O3 proportion (for composition C2 only) between 0.1 wt% and 6.0 wt%; - the remainder being Al2O3; the composition exhibits the following porosity distribution: - pore volume in the range of pore size between 5 nm and 100 nm between 0.35 and 1.00 mL / g; and - pore volume less than or equal to 0.15 mL / g in the range of pore size between 10 nm and 5 nm. The pore volume in the range of 0 nm to 1000 nm, determined by mercury porosimetry; and the following characteristics: - an average crystallite size of less than 45.0 nm, preferably less than 40.0 nm, after calcination in air at 1100 °C for 5 hours (denoted as D1100 °C-5h); - an average crystallite size of less than 25.0 nm, preferably less than 20.0 nm, and even more preferably less than 15.0 nm, after calcination in air at 900 °C for 2 hours (denoted as D900 °C-2h); and - the increase in the average crystallite size of less than 30.0 nm, preferably less than 25.0 nm, ΔD, calculated by the following formula: ΔD = D 1100℃‑2h -D 900℃‑5h The average size of the crystallites was obtained by XRD from the diffraction peaks corresponding to the cubic phase of cerium oxide, which are typically present at 2Φ between 28.0 and 30.0 [111].

The present application provides a material for plasma spraying that enables formation of a HAp coating film that is high in hardness and less likely to wear even under plasma spraying conditions with low flame energy. The HAp powder has an average particle diameter (D 50 ) of 15 to 40 μm and a pore volume of pores with a pore diameter of 2000 nm or less as measured by mercury porosimetry of 0.01 to 0.30 cc / g. The HAp powder enables plasma spraying even under plasma spraying conditions with low flame energy and enables formation of a HAp coating film that is high in hardness and less likely to wear.

Disclosed in the present application are a negative electrode material and a lithium-ion battery. The negative electrode material comprises a carbon material having pores therein. The pores are characterized in that the pore volume of pores having a pore diameter of 3 nm or more and 1000 nm or less as measured by means of mercury porosimetry is V1, where V1<0.1 mL / g; the pore volume of pores having a pore diameter of 3 nm or more and 400 nm or less as measured by means of mercury porosimetry is V2, and the range of the V2 / V1 ratio satisfies 40-70%; and the pore volume of pores having a pore diameter of 3 nm or more and 500 nm or less as measured by means of mercury porosimetry is V3, and the range of the V3 / V1 ratio satisfies ≥60%.

Provided is a precursor of a positive electrode active material, which enables a positive electrode active material having excellent durability to be obtained. A precursor of a positive electrode active material, the precursor comprising secondary particles in which a plurality of primary particles are agglomerated, the primary particles comprising a nickel composite hydroxide, the average pore diameter of the precursor, as determined by mercury porosimetry, exceeding 3.60 μm, and the total pore specific surface area being less than 0.26 m 2 / g.

Provided is a positive electrode for a nonaqueous electrolyte secondary battery, which has a low porosity of a positive electrode composite sheet and can suppress a decrease in charge / discharge cycle characteristics. The positive electrode (11) includes a positive electrode core material (30) and a positive electrode composite sheet (32) bonded to a surface of the positive electrode core material (30), the positive electrode composite sheet (32) includes a conductive material-coated active material in which a conductive material is attached to a surface of a positive electrode active material and a fibrous binder, the porosity of the positive electrode composite sheet (32) is 17.8% or greater and 23.2% or less, and a mode diameter of the positive electrode composite sheet (32) obtained by a mercury porosimetry method is greater than 0.19 µm and less than 0.87 µm.