Lignin-derived hard carbon anode with a robust solid electrolyte interphase for boosted sodium storage performance  

作　　者：Jingqiang Zheng Yulun Wu Chaohong Guan Danjun Wang Yanqing Lai Jie Li Fuhua Yang Simin Li Zhian Zhang 

机构地区：[1]Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy,National Energy Metal Resources and New Materials Key Laboratory,School of Metallurgy and Environment,Engineering Research Center of the Ministry of Education for Advanced Battery Materials,Central South University,Changsha,China [2]University of Michigan-Shanghai Jiao Tong University Joint Institute,Shanghai Jiao Tong University,Shanghai,China [3]Helmholtz Institute Ulm,Ulm,Germany

出　　处：《Carbon Energy》2024年第9期235-244,共10页碳能源（英文）

基　　金：The authors are grateful for the grants provided by the National Natural Science Foundation of China(Grant no.52274309);the Postgraduate Scientific Research Innovation Project of Hunan Province(Grant no.CX20220183);Simin Li thanks the National Natural Science Foundation of China(Grant no.52204327).

摘　　要：Hard carbon is regarded as a promising anode candidate for sodium-ion batteries due to its low cost,relatively low working voltage,and satisfactory specific capacity.However,it still remains a challenge to obtain a high-performance hard carbon anode from cost-effective carbon sources.In addition,the solid electrolyte interphase(SEI)is subjected to continuous rupture during battery cycling,leading to fast capacity decay.Herein,a lignin-based hard carbon with robust SEI is developed to address these issues,effectively killing two birds with one stone.An innovative gas-phase removal-assisted aqueous washing strategy is developed to remove excessive sodium in the precursor to upcycle industrial lignin into high-value hard carbon,which demonstrated an ultrahigh sodium storage capacity of 359 mAh g^(-1).It is found that the residual sodium components from lignin on hard carbon act as active sites that controllably regulate the composition and morphology of SEI and guide homogeneous SEI growth by a near-shore aggregation mechanism to form thin,dense,and organic-rich SEI.Benefiting from these merits,the as-developed SEI shows fast Na+transfer at the interphases and enhanced structural stability,thus preventing SEI rupture and reformation,and ultimately leading to a comprehensive improvement in sodium storage performance.

关 键 词：hard carbon LIGNIN SODIUM components sodium-ion storage SOLID ELECTROLYTE INTERPHASE 

分 类 号：TM91[电气工程—电力电子与电力传动]