三种生物质碳材料的制备及其在锂硫电池中的应用  

PREPARATION OF DIFFERENT BIOMASS CARBON MATERIALS ANDTHE APPLICATION IN LITHIUM-SULFUR BATTERIES

作　　者：李朋朋 李东楼 张娟素 程阳 白国梁 王春花 LI Peng-peng;LI dong-lou;ZHANG Juan-su;CHENG Yang;BAI Guo-liang;WANG Chun-hua(College of Chemistry and Chemical Engineering,Anqing Normal University,Anqing,Anhui 246013,China)

机构地区：[1]安庆师范大学化学化工学院,安徽安庆246013

出　　处：《井冈山大学学报（自然科学版）》2023年第6期46-52,共7页Journal of Jinggangshan University (Natural Science)

基　　金：省部共建煤炭高效利用与绿色化工国家重点实验室开放课题项目(2022-K65)。

摘　　要：锂硫电池由于具有较高的能量密度、较低的原材料成本而备受关注。本文采用三种不同的生物质材料高温热解制备了锂硫电池用生物质碳材料。采用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、FT-IR、BET、TGA进行了物理表征,并采用恒流充放电性能测试、循环伏安测试(CV)、交流阻抗测试的手段,研究了不同来源的生物质材料和高温制备的生物碳材料在锂硫电池中电化学性能的发挥。研究结果表明,以丝瓜瓤高温热解得到的丝瓜基生物碳材料,具有最高的比表面积661.5 m^(2)·g^(-1)和最大的孔容积0.4228 cm^(3)·g^(-1),并作为载体与硫复合后得到了最优的电化学性能,其首周放电比容量为910.3 m Ah·g^(-1),循环200周后比容量仍可达到554.1 m Ah·g^(-1),显示出了良好的循环性能,同时也表现出了较好的倍率性能。Lithium-sulfur batteries have gained considerable attention due to their high energy density and low raw material cost.In this paper,biomass carbon materials for lithium-sulfur batteries were prepared from three different biomass materials by high-temperature pyrolysis.Physical characterization was carried out by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),FT-IR,BET,TGA,and constant current charge/discharge performance test,cyclic voltammetry(CV)test,AC impedance test were used to investigate the development of electrochemical properties in lithium-sulfur batteries.The results showed that the loofah-based biocarbon material obtained by high-temperature pyrolysis of loofah flesh had the highest specific surface area of 661.5 m^(2)·g^(-1)and the largest pore volume of 0.4228 cm^(3)·g^(-1),and obtained the optimal electrochemical performance as a carrier compounded with sulfur,with a specific capacity of 910.3 mAh·g^(-1)in the first week of discharge and 554.1 mAh·g^(-1)after 200 weeks of cycling.The first week discharge specific capacity was 910.3 mAh·g^(-1),and the specific capacity could still reach 554.1 mAh·g^(-1)after 200 weeks of cycling,indicating good cycling and rate performance.

关 键 词：锂硫电池 正极材料 生物碳 高温热解 丝瓜瓤 

分 类 号：TM912[电气工程—电力电子与电力传动]