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Stable Sodium Metal Batteries via Manipulation of Electrolyte Solvation Structure
Author(s) -
Wang Shiyang,
Chen Yawei,
Jie Yulin,
Lang Shuangyan,
Song Junhua,
Lei Zhanwu,
Wang Shuai,
Ren Xiaodi,
Wang Dong,
Li Xiaolin,
Cao Ruiguo,
Zhang Genqiang,
Jiao Shuhong
Publication year - 2020
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.201900856
Subject(s) - electrolyte , faraday efficiency , anode , electrochemistry , sodium , metal , materials science , solvation , chemical engineering , interphase , inorganic chemistry , electrode , chemistry , ion , metallurgy , organic chemistry , engineering , genetics , biology
Sodium metal batteries have attracted rapidly rising attention due to their low cost and high energy densities. However, the instability and low efficiency of metallic sodium anodes pose significant concerns for their practical applications. Here a highly stable sodium metal anode enabled by an ether‐based electrolyte is reported, which exhibits a long‐term stable cycling up to 400 cycles and achieves an unprecedentedly average Coulombic efficiency of over ≈99.93%. It is revealed that the organic/inorganic hybrid structure containing B–O species and NaF in the ultrathin solid‐electrolyte interphase layer plays the key role for the outstanding electrochemical performances. Furthermore, a Na||Na 3 V 2 (PO 4 ) 3 full cell successfully achieves a stable cycling performance that paves the way for the development of sodium metal batteries.