학술논문
高导多孔导电碳材料的合成及其在高能量密度锂硫电池中的应用 / Synthesis and Application of Carbon Material with High Conductivity and Multiple Pores for High-Energy Lithium Sulfur Batteries
Document Type
Academic Journal
Author
Source
新能源进展 / Advances in New and Renewable Enengy. 11(6):519-523
Subject
Language
Chinese
ISSN
2095-560X
Abstract
锂硫电池具有较高克容量和能量密度的优势,其理论克容量和能量密度远超现有的正极,被视为最有潜力的下一代储能器件之一.但是硫本身较差的导电性及充放电过程中突出的穿梭效应限制了其应用.提出一种基于硫正极极片的新型导电添加剂的制备及应用.将海绵焦与碱性造孔剂混合,在高温下热处理,形成具有高导电性、微孔及介孔(2～3 nm)分布的多孔碳.将该多孔碳应用在硫正极上,可有效提升硫正极的导电性并加强其对多硫化物的吸附,从而提升硫正极的循环稳定性和倍率性能.
Lithium sulfur battery is considered as one of the most promising energy storage devices owing to its high theoretical specific capacity and energy density,which are much higher than those of the current cathode.However,the technical challenges including the intrinsic insulation nature of sulfur and the famed shuttle effect during cycling prohibit its practical application.Herein,a new carbon additive applied in sulfur electrodes was proposed,which was synthesized by heating the mixture of sponge coke and alkali pore-forming agent.The obtained porous carbon with high conductivity and abundant micro-,meso-pores(2-3 nm)is beneficial for improving the conductivity of the sulfur electrodes and enhancing the adsorption for the soluble polysulfide when appropriately used as the conductive additive,leading to the sulfur electrodes with high stability and high rate capability.
Lithium sulfur battery is considered as one of the most promising energy storage devices owing to its high theoretical specific capacity and energy density,which are much higher than those of the current cathode.However,the technical challenges including the intrinsic insulation nature of sulfur and the famed shuttle effect during cycling prohibit its practical application.Herein,a new carbon additive applied in sulfur electrodes was proposed,which was synthesized by heating the mixture of sponge coke and alkali pore-forming agent.The obtained porous carbon with high conductivity and abundant micro-,meso-pores(2-3 nm)is beneficial for improving the conductivity of the sulfur electrodes and enhancing the adsorption for the soluble polysulfide when appropriately used as the conductive additive,leading to the sulfur electrodes with high stability and high rate capability.