Design and Synthesis of Hollow Porous Carbon Materials and Their pplication in Lithium-Sulfur Batteries

Abstract

锂硫(Li-S)电池由于具有高理论比能量(2600Whkg-1),被认为是最有希望的下一代储能电池之一,并成为了过去几年的研究热点。虽然硫具有储量丰富,低成本和无毒等优点,但硫正极本身固有的问题阻碍了Li-S电池的实际应用:首先,硫本身的电绝缘性、充放电过程中多硫化物易发生穿梭效应、以及硫与硫化锂转化过程中体积膨胀(~80%)等问题造成低的硫利用率和差的循环寿命;其次,目前所报道的Li-S电池正极单位面积的载硫量大多低于2.0mgcm-2,同时,正极中活性物质硫的百分含量普遍低于70wt%,不能满足高能量密度Li-S电池的需求;最后,单位面积硫负载量与电极厚度之间的不匹配,导致高硫负载的正极虽...Rechargeable lithium-sulfur (Li-S) batteries with the theoretical specific energy (≈2600 Wh kg−1) have attracted considerable attention due to its favorable prospect in future high-energy storage systems. Although sulfur has the advantages of high abundance, low cost, and nontoxicity, several inherent problems caused by the sulfur cathodes still prevent the practical applications of Li-S bat...学位:工学硕士院系专业:萨本栋微米纳米科学技术研究院_能源化工学号:3352014115242

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