The present invention provides an alumina particle containing molybdenum (Mo) and an inorganic coating part provided on the surface of the alumina particle.

Carbon-based energy storage devices and methods of forming the same are disclosed. A method of producing an energy storage device can include treating pitch to produce a carbon fiber material, fusing a plurality of carbon fibers of the carbon fiber material together to form a carbon monolith, such that the plurality of carbon fibers are fused at contact points by melt blowing, and compressing the carbon monolith to a predetermined density.

A method of producing a graphene-based precursor includes providing graphene flakes based on one or more predetermined criteria, at least some of the graphene flakes having lattice defects, modifying the graphene flakes by decorating at least some of the graphene flakes with non-graphene carbon structures to form modified graphene flakes, and crumpling the modified graphene flakes to form graphitic carbon mesostructures.

A method of increasing porosity of graphene-based precursors including wetting the graphene-based precursors with water, rapidly freezing the graphene-based precursors after the wetting step to cause expansion of a water volume within the graphene-based precursors to cause defects within the graphene-based precursors, and thawing and removing the water from the graphene-based precursors.

A positive electrode active material, a secondary battery, and an electric device are disclosed. The positive electrode active material satisfies the following relationship: 300P*D/800; where P represents the porosity of the positive electrode active material, with a unit of %; D represents the crystal plane dimension of the (110) crystal plane of the positive electrode active material, with a unit of ; and represents a splitting degree between a diffraction angle of the (110) crystal plane and that of (108) crystal plane of the positive electrode active material, with a unit of .

A cathode active material for a lithium secondary battery includes a lithium-aluminum-titanium oxide formed on a surface of a lithium metal oxide particle having a specific formula. The cathode active material may have an improved structural stability even in a high temperature condition.

The present disclosure belongs to the technical field of batteries, and specifically discloses a cathode material and a preparation method thereof, a lithium-ion battery, and an electrical device. The cathode material satisfies: 1.5<Kn.sub.90=(Ln.sub.90Ln.sub.10)/Ln.sub.50<4.5; 0<Ln.sub.10<2000 ; Ln.sub.10<Ln.sub.50<3000 ; and Ln.sub.50<Ln.sub.90<15000 .