全固态锂硫电池电极及电解质膜的制备及性能研究  

Preparation and performance of electrode and electrolyte membrane for all-solid-state Li-S batteries

作　　者：吕忠伟 彭锦雪 郑陈熙 龚正良 LU Zhongwei;PENG Jinxue;ZHENG Chenxi;GONG Zhengliang(College of Energy,Xiamen University,Xiamen Fujian 361102,China)

机构地区：[1]厦门大学能源学院,福建厦门361102

出　　处：《电源技术》2024年第4期622-627,共6页Chinese Journal of Power Sources

基　　金：国家重点研发计划项目(2021YFB2401800);国家自然科学基金项目(22279108、21935009、22261160570);厦门大学大学生创新创业训练计划项目(202210384151)。

摘　　要：全固态锂硫电池(ASSLSBs)兼具高能量密度与高安全性,被认为是最具潜力的下一代储能体系候选者之一,然而目前实验室使用的粉末冷压技术并不适合实际应用。因此,开发合适的工艺大规模制备固态电解质膜以及复合正极对促进全固态锂硫电池的实际化应用具有重要意义。以二甲苯作为溶剂,苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)作为粘结剂,通过浆料涂布工艺制备了具有高离子电导率(4.7×10^(-4) S/cm)的自支撑硫化物固态电解质膜以及高硫含量(50%质量分数)、高硫载量(4~5 mg/cm^(2))的复合硫正极极片,并研究了其性能。研究表明:SEBS质量分数为3%时,电解质膜兼具柔性及高离子电导率;SEBS质量分数为1%的复合硫正极极片表现出良好的电化学性能。使用固态电解质膜与复合正极极片组装的全固态锂硫电池首次放电比容量可达742.9 mAh/g。All-solid-state Li-S batteries(ASSLSBs)are considered to be one of the most promising can‐didates for next-generation energy storage systems due to high energy density and high safety.How‐ever,the powder cold pressing technology currently used in the laboratory is not suitable for large-scale manufacturing.Thus,it is significant to develop a process to prepare electrolyte membranes and electrodes to promote the practical application of ASSLSBs.In this work,self-supported sulfide-based electrolyte membrane and sulfur electrode sheet were prepared by a scalable slurry-casting method using Xylene as the solvent and styrene‐ethylene-butylene‐styrene block copolymer(SEBS)as the binder.The electrolyte membranes with high ionic conductivity(4.7×10^(-4) S/cm)and sulfur cathode sheet with high sulfur content(50%)and high sulfur loading(4-5 mg/cm^(2))were obtained,and their performance were studied.The results indicate that when the SEBS content is 3%,the electrolyte membrane shows flexibility and high ionic conductivity.The sulfur cathode sheet with 1%SEBS ex‐hibits high reversible capacity and good cycling stability.The sheet-type ASSLSBs assembled with the electrolyte membrane and sulfur cathode sheet,delivers a discharge specific capacity of 742.9 mAh/g.

关 键 词：全固态锂硫电池 自支撑 硫化物电解质膜 硫正极极片 

分 类 号：TM912.9[电气工程—电力电子与电力传动]