▎ 摘　　要

NOVELTY - Lithium-ion battery electrolyte comprises an electrolyte, an organic solvent and an additive, where the electrolyte is lithium iron phosphate, the organic solvent comprises propylene carbonate (PC) and diethyl carbonate (DEC), and the additive comprises sub layer graphene; where the sub-graphene includes multiple layers of graphene and diamond, the diamond is located between two adjacent layers of the multilayered graphene sheet, and the diamond corresponds to the carbon atoms of the multilayered graphene sheet one by one. USE - Used as lithium-ion battery electrolyte. ADVANTAGE - The electrolyte improves the safety of the battery, improves the material conductivity, joins the material of the electrolyte without changing battery structures, increases ion exchange channels and has larger battery discharge current and reduces energy consumption. DETAILED DESCRIPTION - Lithium-ion battery electrolyte comprises an electrolyte, an organic solvent and an additive, where the electrolyte is 8-10 wt.% lithium iron phosphate, the organic solvent comprises 40-50 wt.% propylene carbonate (PC) and 40-50 wt.% diethyl carbonate (DEC), and the additive comprises 0.5-1.5 wt.% sub layer graphene; where the sub-graphene includes multiple layers of graphene and diamond, the diamond is located between two adjacent layers of the multilayered graphene sheet, and the diamond corresponds to the carbon atoms of the multilayered graphene sheet one by one. The volume ratio of the multilayer flake graphene to the diamond is 18-19:1; the multi-layered sheet of graphene is 3-5 layers of graphene, and the thickness of each layer of the multilayered sheet graphene is 0.2-0.5 nm; the interlayer spacing between two adjacent layers of the multilayered graphene is 0.2-0.4 nm; and the diamond is spherical carbon, and the spherical carbon has a particle diameter of 0.7-1.6 nm. An INDEPENDENT CLAIM is also included for preparing lithium-ion battery electrolyte comprising (i) adopting chemical deposition method for preparing multi-layer graphene sheet, depositing a layer of nickel metal layer on surface of silicon dioxide substrate by cathode ray, where the thickness of the nickel metal layer is 200-400 nm, (ii) carrying tubular furnace into mixed gas of methane, hydrogen and ammonia and normal graphite powder at 950-1150 degrees C and quickly cooling to room temperature within 100 mili seconds to obtain multilayer graphene sheet, where the layer number of the multilayer sheet-shaped graphite alkene is 3-12 layer, (iii) cleaning the environment more than hundred thousand grades, peeling off the 3-5 layer sheet of graphene and diamond by molecular knife and observing through an electron microscope , (iv) peeling off the 3-5 layer sheet of graphene and diamond of step (iii) under the vacuum 100-200 Pa at 600-800 degrees C, and stirring for 34-38 hours.