▎ 摘　　要

NOVELTY - A dendrite penetration-resistant layer comprises multiple graphene sheets or platelets or exfoliated graphite flakes that are chemically bonded by lithium- or sodium-containing species to form integral layer that prevents dendrite penetration through integral layer in alkali metal battery, in which lithium- or sodium-containing species is selected from lithium carbonate (Li2CO3), lithium oxide (Li2O), lithium oxalate (Li2C2O4), and lithium hydroxide (LiOH). USE - A dendrite penetration-resistant layer for rechargeable alkali metal battery (claimed) used for vehicles and portable electronic devices. ADVANTAGE - The method enables production of battery which has high specific energy, high energy density, high rate capability, and long cycle life, and is safe to use. DETAILED DESCRIPTION - A dendrite penetration-resistant layer comprises multiple graphene sheets or platelets or exfoliated graphite flakes that are chemically bonded by lithium- or sodium-containing species to form integral layer that prevents dendrite penetration through integral layer in alkali metal battery, in which lithium- or sodium-containing species is selected from lithium carbonate (Li2CO3), lithium oxide (Li2O), lithium oxalate (Li2C2O4), lithium hydroxide (LiOH), compound of formula (LiX), compound of formula (ROCO2Li), compound of formula (HCOLi), compound of formula (ROLi), compound of formula (ROCO2Li)2, compound of formula ((CH2OCO2Li)2), lithium sulfide (Li2S), compound of formula (LixSOy), sodium carbonate (Na2CO3), sodium oxide (Na2O), sodium oxalate (Na2C2O4), sodium hydroxide (NaOH), compound of formula (NaiX), compound of formula (ROCO2Na), compound of formula (HCONa), compound of formula (RONa), compound of formula (ROCO2Na)2, compound of formula (CH2OCO2Na)2, sodium sulfide (Na2S), and/or compound of formula (NaxSOy). Lithium- or sodium-containing species is derived from electrochemical decomposition reaction. X=F, Cl, I, or Br; R=hydrocarbon; x=0-1; and y=1-4. An INDEPENDENT CLAIM is included for method of producing dendrite penetration-resistant layer which involves successively performing step (a) of preparing working electrode containing porous structure of multiple graphene sheets or platelets or exfoliated graphite flakes, step (b) of preparing counter electrode containing lithium or sodium metal or alloy, step (c) of bringing working electrode and counter electrode in contact with electrolyte containing solvent and lithium salt or sodium salt dissolved in solvent, and step (d) of applying current or voltage to working electrode and counter electrode to induce electrochemical oxidative decomposition and/or reductive decomposition of electrolyte for forming lithium- or sodium-containing species that are chemically bonded to multiple graphene sheets or platelets or exfoliated graphite flakes to produce dendrite penetration-resistant layer.