Abstract: Provided is a simple, fast, scalable, and environmentally benign method of producing graphene-embraced particles of a battery electrode active material, comprising: a) mixing graphitic material particles and multiple particles of a milling media to form a mixture in an impacting chamber of an energy impacting apparatus; b) operating the energy impacting apparatus with a frequency and an intensity for a length of time sufficient for transferring graphene sheets from the graphitic material to surfaces of milling media particles to produce graphene-embraced milling media particles; c) mixing particles of an active material with graphene-embraced milling media particles in an impacting chamber of an energy impacting apparatus; d) operating the energy impacting apparatus for transferring graphene sheets from the graphene-embraced milling media particles to surfaces of active material particles to produce graphene-embraced electrode active material particles; and e) recovering these graphene-embraced active materia

Abstract: Provided is graphene-embraced particulate for use as a lithium-ion battery anode active material, wherein the particulate comprises primary particle(s) of an anode active material and multiple sheets of a first graphene material overlapped together to embrace or encapsulate the primary particle(s) and wherein a single or a plurality of graphene-encapsulated primary particles, along with an optional conductive additive, are further embraced or encapsulated by multiple sheets of a second graphene material, wherein the first graphene and the second graphene material is each in an amount from 0.01% to 20% by weight and the optional conductive additive is in an amount from 0% to 50% by weight, all based on the total weight of the particulate. Also provided are an anode and a battery comprising multiple graphene-embraced particulates.

Abstract: A method of producing a graphene suspension, comprising: (a) mixing multiple particles of a graphitic material and multiple particles of a solid carrier material to form a mixture in an impacting chamber of an energy impacting apparatus; (b) operating the energy impacting apparatus with a frequency and an intensity for a length of time sufficient for peeling off graphene sheets from the graphitic material and transferring the graphene sheets to surfaces of the carrier material particles to produce graphene-coated carrier particles inside the impacting chamber; and (c) dispersing the graphene-coated carrier particles in a liquid medium and separating the graphene sheets from the carrier material particles using ultrasonication or mechanical shearing means and removing the carrier material from the liquid medium to produce the graphene suspension. The process is fast (1-4 hours as opposed to 5-120 hours of conventional processes), environmentally benign, cost effective, and highly scalable.

Abstract: Provided is graphene-embraced particulate for use as a lithium-ion battery anode active material, wherein the particulate comprises primary particle(s) of an anode active material and multiple sheets of a first graphene material overlapped together to embrace or encapsulate the primary particle(s) and wherein a single or a plurality of graphene-encapsulated primary particles, along with an optional conductive additive, are further embraced or encapsulated by multiple sheets of a second graphene material, wherein the first graphene and the second graphene material is each in an amount from 0.01% to 20% by weight and the optional conductive additive is in an amount from 0% to 50% by weight, all based on the total weight of the particulate. Also provided are an anode and a battery comprising multiple graphene-embraced particulates.

Abstract: The present invention provides an electrolyte solution including an ionic liquid having the structure of formula (I): wherein R1 is C1-C6alkyl, R2 is C2-C7alkyl, A? is defined in the specification. The electrolyte solution of the present invention has high conductivity and high thermal stability.