Premium
Synergistic Dual‐Additive Electrolyte Enables Practical Lithium‐Metal Batteries
Author(s) -
Li Siyuan,
Zhang Weidong,
Wu Qiang,
Fan Lei,
Wang Xinyang,
Wang Xiao,
Shen Zeyu,
He Yi,
Lu Yingying
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202004853
Subject(s) - electrolyte , cathode , anode , chemical engineering , materials science , lithium (medication) , metal , inorganic chemistry , chemistry , electrode , metallurgy , medicine , engineering , endocrinology
A rechargeable Li metal anode coupled with a high‐voltage cathode is a promising approach to high‐energy‐density batteries exceeding 300 Wh kg −1 . Reported here is an advanced dual‐additive electrolyte containing a unique solvation structure and it comprises a tris(pentafluorophenyl)borane additive and LiNO 3 in a carbonate‐based electrolyte. This system generates a robust outer Li 2 O solid electrolyte interface and F‐ and B‐containing conformal cathode electrolyte interphase. The resulting stable ion transport kinetics enables excellent cycling of Li/LiNi 0.8 Mn 0.1 Co 0.1 O 2 for 140 cycles with 80 % capacity retention under highly challenging conditions (≈295.1 Wh kg −1 at cell‐level). The electrolyte also exhibits high cycling stability for a 4.6 V LiCoO 2 (160 cycles with 89.8 % capacity retention) cathode and 4.95 V LiNi 0.5 Mn 1.5 O 4 cathode.