▎ 摘　　要

NOVELTY - Method of using a graphene-cellulosic polymer composition to modulate lithium-ion battery cathode performance involves contacting an exfoliated graphene-cellulosic polymer composition with a composition comprising lithium manganese oxide (LMO) nanoparticles and a hydrophobic fluid component, depositing the composition on a lithium-ion battery cathode substrate, and annealing the deposited composition to conformally coat the LMO nanoparticles with graphene and/or cellulosic polymer annealation product, thereby modulating at least one of the packing density of the LMO nanoparticles and manganese ion dissolution from the nanoparticles. USE - Method of using graphene-cellulosic polymer composition to modulate performance of cathode (claimed) of lithium-ion battery used in personal mobile electronics, electric vehicles and high-altitude aircraft. ADVANTAGE - The method efficiently modulates or enhances the packing density of LMO nanoparticles and/or manganese ion dissolution from the nanoparticles. The use of graphene ensures high electrical conductivity, electrochemical stability, high-temperature cycle characteristics, capacity retention and energy efficiency of the battery. The nano-LMO/graphene composite ensures excellent power performance during both charge/discharge cycles up to 20C at room temperature. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) Cathode; (2) formation of composite, which involves agitating a mixture of nanoparticles, few-layered graphene and ethyl cellulose in a solvent to disperse the nanoparticles and few-layered graphene with the ethyl cellulose so as to prevent aggregation of the nanoparticles, evaporating the solvent from the mixture to form a dispersion of the nanoparticles and few-layered graphene with ethyl cellulose, and ambient-annealing the dispersion at a temperature for a preset time to decompose ethyl cellulose. The nanoparticles are selected from lithium-ion cathode active materials for a lithium-ion battery and lithium-ion anode active materials for a lithium-ion battery. The few-layered graphene comprises monolayered graphene, bilayered graphene and n-layered graphene, where n is 3-6. In the composite, nanoparticles are evenly mixed with few-layered graphene, and individual nanoparticles rather than multiparticles are conformally coated with a combination of few-layered graphene and annealation product of ethyl cellulose that comprises amorphous carbon having sp2-carbon content. The composite has a peak at 2D-band in Raman spectroscopy. The few-layered graphene does not contain graphene oxide and reduced graphene oxide.