中空FeS_(2)/NiS_(2)/Ni_(3)S_(2)@NC立方体复合材料的制备及其电化学性能  

Preparation and Electrochemical Properties of Hollow FeS2/NiS2/Ni3S2@NC Cube Composites

作　　者：刘莹[1] 陈平[1] 周雪[1] 孙晓杰 王瑞琪 LIU Ying;CHEN Ping;ZHOU Xue;SUN Xiaojie;WANG Ruiqi(State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工学院精细化工重点实验室,大连116024

出　　处：《材料研究学报》2024年第6期453-462,共10页Chinese Journal of Materials Research

基　　金：兴辽英才项目(XLYC1802085);国家自然科学基金(51873109);大连市科技创新基金重大项目(2019J11CY007)。

摘　　要：以Cu2O立方体为自牺牲模板,进行协同刻蚀-沉淀(CEP)路线、高温煅烧、聚多巴胺(PDA)涂层包覆和高温硫化,制备出中空FeS_(2)/NiS_(2)/Ni_(3)S_(2)@NC纳米立方体复合材料并研究其电化学性能。结果表明,通过CEP路线并引入Ni和Fe金属元素,制备过程较为简单和安全。这种材料的中空立方体结构,能抑制体积膨胀和减小锂离子嵌入脱出产生的机械应力。引入N掺杂碳层(NC)能极大地提高材料的导电性和结构稳定性,更好地维持立方体结构。在电流密度为0.2 A·g^(-1)的条件下经过100次循环后,FeS_(2)/NiS_(2)/Ni_(3)S_(2)@NC纳米立方体复合材料的放电比容量保持在899.4 mAh·g^(-1),表明其具有较高的比容量、良好的循环稳定性和倍率性能(3.0 A·g^(-1)电流密度下比容量为427.5 mAh·g^(-1))。A novel composite hollow FeS2/NiS2/Ni_(3)S2@NC cube is synthesized through collaborative etch-precipitation(CEP)route,high-temperature calcination,polydopamine coating and high-temperature vulcanization with a pre-prepared Cu2O cube as sacrificial template.The preparation process is safe,while Ni and Fe are successfully incorporated through the CEP route.The hollow cube structure can effectively restrain the volume expansion and slow down the mechanical stress caused by lithium-ion embedding and release.The introduction of N-doped carbon layer(NC)can greatly improve the conductivity and structural stability of the composite material,so that it can better maintain the stability of the cube structure.Furthermore,after 100 cycles at a current density of 0.2 A·g^(-1),the specific discharge capacity of the FeS2/NiS2/Ni_(3)S2@NC cube composite can be maintained at 899.4 mAh·g^(-1),showing high specific capacity,good cycle stability,and great rate performance(427.5 mAh·g^(-1)at 3.0 A·g^(-1)).

关 键 词：复合材料 锂离子电池 负极材料 过渡金属硫化物 

分 类 号：TM912[电气工程—电力电子与电力传动]