▎ 摘　　要

NOVELTY - A lead acid battery (20) comprises a negative electrode (21), a positive electrode (23) comprising lead oxide, an electrolyte in physical contact with the negative and positive electrodes, an optional separator positioned between the negative and positive electrodes. The negative electrode comprises negative particulates of graphene-protected lead or its alloy. At least one of the negative particulates is formed of a single or multiple graphene sheets. The single or multiple fine lead or its alloy particles have size less than 10 mu m. The graphene sheets and the lead or its alloy particles are mutually bonded or agglomerated into the particulate with graphene sheet(s) embracing or wrapping around the particulate. The content of graphene in the particulate is 0.01-99 wt.%. USE - Lead acid battery. Uses include but are not limited to recreational vehicle, hybrid electric vehicle, power tool, and marine industry. ADVANTAGE - The lead acid battery comprises graphene sheets in a particulate form which enables fully reversible transformation of all reactants and prevents the formation of hard lead sulfate, thus it ensures excellent cycle life (very large number of cycles without any capacity decay) and high active material utilization efficiency (high energy density) of the battery. The graphene sheet in the interior and exterior surface of particulate provides a robust 3-dimensional network of electron-conducting paths and high conductivity, and is capable of improving performance of the battery and increasing mechanical strength of the electrode. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) lead acid battery electrode; and (2) manufacture of lead acid battery, which involves preparing negative particulates by preparing a suspension of graphene sheets dispersed in a liquid medium and mixing particles of lead or its alloy in the suspension to form a multi-component suspension, and forming the multi-component suspension into a micro-droplets, and removing the liquid medium in such a manner that the lead or its alloy particles and graphene sheets are assembled together, and preparing positive particulates by preparing a precursor mixture suspension of a graphene material with a precursor to lead oxide dispersed in a liquid medium, dispensing and forming the precursor mixture suspension into precursor particulates, and thermally and/or chemically converting the precursor mixture to positive particulates of graphene-protected lead. The graphene is chosen from pristine graphene, reduced graphene oxide, graphene oxide, graphene fluoride, hydrogenated graphene, nitrogenated graphene, doped graphene, and chemically-functionalized graphene. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the lead acid battery. Lead acid battery (20) Negative electrode (21) Negative current collector (22) Positive electrode (23) Positive current collector (24)