FeS_(2)/竹叶碳复合负极材料的制备及其储锂性能研究  

Preparation and Lithium Storage Properties of FeS_(2)/Bamboo-Leaf Carbon Composite Anode Materials

作　　者：金姚瑶 胡章涛 张瀚 望军 JIN Yaoyao;HU Zhangtao;ZHANG Han;WANG Jun(College of Materials and New Energy,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]重庆科技大学材料与新能源学院,重庆401331

出　　处：《重庆科技大学学报(自然科学版)》2025年第1期37-43,共7页Journal of Chongqing University of Science and Technology(Natural Sciences Edition)

基　　金：国家自然科学基金项目“锂硫电池正极载体材料的构筑及其对放电过程的分段控制机制”(52107223)。

摘　　要：作为典型的转化反应型储锂负极材料,FeS_(2)具有无毒、成本低廉和理论比容量高等优势,是高性能锂离子电池潜在的负极材料之一。然而,FeS_(2)在储能过程中的动力学性能较差,导致其在锂离子电池中的应用受限。为提高锂离子电池性能并降低成本,采用水热法将竹叶碳(BC)与FeS_(2)结合制备成FeS_(2)/BC复合负极材料。电化学性能测试结果表明,FeS_(2)BC具有优异的循环稳定性和倍率性能。当电流密度为200 mA/g时,循环100次后的FeS_(2)/BC放电比容量为703.3(mA·h)/g。这归因于BC可以增大电解质与活性材料之间的接触面积,并通过额外的空隙空间来适应其体积变化。动力学性能测试结果表明,赝电容行为在决定FeS_(2)/BC电极整体容量方面起着比较重要的作用。该研究为提高FeS_(2)基负极材料的可逆容量和长循环寿命提供了一条新途径。As a typical lithium storage negative material of conversion reaction-type,FeS_(2),which has the superior advantages of nontoxicity,low cost,and high theoretical property,is one of the potential negative materials for lithium-ion batteries with high-performance.However,the poor kinetic energy of FeS_(2)during the storage process hinders its commercial application in lithium-ion batteries.FeS_(2)/BC composite negative materials are prepared by hydrothermal method with the combination of bamboo leaf carbon and FeS_(2).The results of electrochemical test show that FeS_(2)/BC has excellent cycling stability and rate performance.When the current density is 200 mA g,the discharge property of FeS_(2)/BC after 100 cycles is 703.3(mA·h)g,the reason of which is that bamboo leaf carbon can increase the contact area between the electrolyte and the active material,thereby improving electrical conductivity and adapting to volume changes through additional void space.The results of the kineticenergy test manifest that the performance of double-layer capacitor plays a significant role in determining the overall capacity of the FeS_(2)/BC electrode.This pager provides a new approach for improving the reversible capacity and long-cycle life of FeS_(2)-based negative materials.

关 键 词：锂离子电池 FeS_(2) 负极材料 竹叶碳 电化学性能 动力学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]