Abstract: A pre-doping agent for a power storage device includes a lithium iron oxide represented by Formula (1), wherein in X-ray diffractometry, a half width of a diffraction peak at a diffraction angle (2?) of 23.6°±0.5° is 0.06° to 0.17°, and an intensity ratio (I44.6/I23.6) of a diffraction peak intensity (I44.6) at a diffraction angle (2?) of 44.6°±0.5° to a diffraction peak intensity (I23.6) at a diffraction angle (2?) of 23.6°±0.5° is less than 8%. The pre-doping agent for a power storage device with a large irreversible capacity can be suitably used as a power storage device, which can suppress reduction in a volume energy density of a power storage device, can reduce a production cost, can prevent decomposition of an electrolytic solution. LixFeOy??(1) wherein x meets 3.5?x?7.0 and y meets 3.1?y?5.0.

Abstract: Provided is an inorganic powder composite used for a water-in-oil type fine dispersion system which is excellent in emulsification and emulsification stability. The inorganic powder composite includes: an inorganic powder; and a first hydrophobic treatment agent, a second hydrophobic treatment agent, and a hydrophilic treatment agent, which cover at least one part of a surface of the inorganic powder, the first hydrophobic treatment agent is a silicon compound, the second hydrophobic treatment agent is a fatty acid, and the hydrophilic treatment agent is hydrous silica.