Open AccessA Dual‐Salt Gel Polymer Electrolyte with 3D Cross‐Linked Polymer Network for Dendrite‐Free Lithium Metal Batteries
Author(s) -
Fan Wei,
Li NianWu,
Zhang Xiuling,
Zhao Shuyu,
Cao Ran,
Yin Yingying,
Xing Yi,
Wang Jiaona,
Guo YuGuo,
Li Congju
Publication year - 2018
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201800559
Subject(s) - electrolyte , materials science , ionic conductivity , lithium (medication) , dendrite (mathematics) , chemical engineering , salt (chemistry) , polymer , conductivity , fast ion conductor , electrode , composite material , chemistry , organic chemistry , endocrinology , medicine , geometry , mathematics , engineering
Abstract Lithium metal batteries show great potential in energy storage because of their high energy density. Nevertheless, building a stable solid electrolyte interphase (SEI) and restraining the dendrite growth are difficult to realize with traditional liquid electrolytes. Solid and gel electrolytes are considered promising candidates to restrain the dendrites growth, while they are still limited by low ionic conductivity and incompatible interphases. Herein, a dual‐salt (LiTFSI‐LiPF 6 ) gel polymer electrolyte (GPE) with 3D cross‐linked polymer network is designed to address these issues. By introducing a dual salt in 3D structure fabricated using an in situ polymerization method, the 3D‐GPE exhibits a high ionic conductivity (0.56 mS cm −1 at room temperature) and builds a robust and conductive SEI on the lithium metal surface. Consequently, the Li metal batteries using 3D‐GPE can markedly reduce the dendrite growth and achieve 87.93% capacity retention after cycling for 300 cycles. This work demonstrates a promising method to design electrolytes for lithium metal batteries.