Additives strategies to improving cycling stability of Li metal batteries by modifying electrode electrolyte interphases

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：Li metal batteries(LMBs)have attracted much attention due to the ultra-high theoretical capacity of the Li metal anode(LMA).However,the uncontrollable dendrites growth and low coulombic efficiency hinder their practical application.Here,we explore 3,5-difluoropyridine(2F-BD)as a novel electrolyte additive to enable high-performance LMBs.The 2F-BD additive participates in and modifies the solvation structure of Li ions by reducing the coordinated number of PF6-at the electrode surface,leading to the formation of a LiF and Li3N-rich solid electrolyte interphase(SEI).The LiF component increases the robustness of SEI and suppresses the formation of Li dendrites,while the Li3N component facilitates the transportation and reaction kinetics of Li ions.As a result,the Li||Li symmetric cell presents a stable cycling performance of up to 500 h at a current density of 1 mA cm-2.After coupling with LiFePO4 cathode,the obtained full cell achieves high specific capacities of 106.06 mA h g-1 and 84.98 mA h g-1 at 2.55 mA cm-2 and 5.10 mA cm-2,respectively,and maintains a high capacity retention of 84.0%after 1000 cycles at 0.13 mA cm-2,with an average cycling CE of 99.58%.

外文关键词：

Li metal batteriesLi dendritesElectrolyte additiveLiF and Li3N-Rich electrode-electrolyte inter-phaseLiFePO4 cathode

作者：

Yuan Li、Pengfei Huang、Chunyu Cui、Xiaoyuan Ma、Li Chen、Zekun Li、Linhai Li、Yuhong Tian

展开 >

作者单位：

School of Biological and Chemical Engineering,Guangxi University of Science and Technology,Liuzhou,545006,China

School of College of Chemistry and Chemical Engineering,Hunan University,Changsha,410012,China

Isky Future Energy Institute,Changsha,410012,China

基金：

National Natural Science Foundation of ChinaNatural Science Foundation of Guangxi Province

项目编号：

222680122021GXNSFAA220067

出版年：

2024

DOI：

10.1016/j.pnsc.2024.03.005

自然科学进展·国际材料(英文)

国家自然科学基金委员会

自然科学进展·国际材料(英文)

影响因子：0.25

ISSN：1002-0071

年,卷(期)：2024.34(2)

参考文献量32