▎ 摘　　要

NOVELTY - Method for preparing nanoparticle/graphene/boron nitride (BN) nanocomposite, involves ball-milling a mixture comprising metal salt, graphene and boron nitride, and calcining the mixture. USE - The method is useful for preparing nanoparticle/graphene/boron nitride (BN) nanocomposite, and nanoparticle/graphene/boron nitride (BN)/sulfur (S) nanocomposite for preparing electrode for lithium-ion battery (all claimed) and rechargeable battery for safe energy-storage device and oil industry to power downhole equipment (e.g. equipment used to monitor conditions in oil wells and other oil-related applications). ADVANTAGE - The nanocomposite is resistant to thermal runaway and used as electrode material in rechargeable battery that are safe, reliable and stable when operated at high temperature and high pressure, more stable and economical, has improved thermal stability, increased surface area and enhanced electrochemical property and consistent electrochemical property even after more than 1000 charge-discharge cycles at about 150 degrees C, and exhibits enhanced performance and stability from room temperature to high temperatures (e.g. more than 25-150 degrees C). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a nanoparticle/graphene/boron nitride (BN) nanocomposite prepared by the above method comprising nanoparticles, graphene and boron nitride; (2) a method for preparing a nanoparticle/graphene/boron nitride (BN)/sulfur (S) nanocomposite, which involves ball-milling a mixture of the nanocomposite and sulfur; (3) a nanoparticle/graphene/boron nitride (BN)/sulfur (S) nanocomposite prepared by the above method; (4) a method for preparing an electrode, which involves mixing the nanoparticle/graphene/boron nitride (BN) nanocomposite with one or more conductive agents, binding agent, and optional additive in a solvent to obtain a slurry, coating a foil substrate with the slurry to form a film, and drying the film under vacuum, or dispersing one or more conductive agents in a solvent to prepare a first solution, preparing a second solution of a binding agent with an optional additive in a solvent, dispersing the nanoparticle/graphene/boron nitride (BN) nanocomposite in a solvent to prepare a third solution, mixing the first, second and third solutions to obtain a slurry, coating a foil substrate with the slurry to form a film, and drying the film under vacuum, or mixing the nanoparticle/graphene/boron nitride (BN)/sulfur (S) nanocomposite with one or more conductive agents and binding agent in a solvent to form a slurry, coating a foil substrate with the slurry to form a film, and drying the film under vacuum; and (5) a lithium-ion battery comprising an anode, a cathode, an electrolyte and a separator between the anode and the cathode, where the anode comprises the nanoparticle/graphene/boron nitride (BN) nanocomposite, or the cathode comprises the nanoparticle/graphene/boron nitride (BN)/sulfur (S) nanocomposite.