Premium
Hybrid Aqueous/Nonaqueous Water‐in‐Bisalt Electrolyte Enables Safe Dual Ion Batteries
Author(s) -
Zhu Jiaojiao,
Xu Yongtai,
Fu Yujun,
Xiao Dewei,
Li Yali,
Liu Lingyang,
Wang Yue,
Zhang Qingnuan,
Li Junshuai,
Yan Xingbin
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201905838
Subject(s) - electrolyte , anode , faraday efficiency , materials science , battery (electricity) , electrochemistry , electrochemical window , niobium pentoxide , cathode , aqueous solution , chemical engineering , electrode , chemistry , niobium , organic chemistry , ionic conductivity , metallurgy , power (physics) , physics , quantum mechanics , engineering
Dual ion batteries (DIBs) have recently attracted ever‐increasing attention owing to the potential advantages of low material cost and good environmental friendliness. However, the potential safety hazards, cost, and environmental concerns mainly resulted from the commonly used nonaqueous organic solvents severely hinder the practical application of DIBs. Herein, a hybrid aqueous/nonaqueous water‐in‐bisalt electrolyte with both broad electrochemical stability window and excellent safety performance is developed. The lithium‐based DIB assembled using KS6 graphite and niobium pentoxide as the active materials in the cathode and anode exhibits good comprehensive performance including capacity, cycling stability, rate performance, and medium discharge voltage. Initial capacities of ≈47.6 and 29.6 mAh g −1 retention after 300 cycles can be delivered with a medium discharge voltage of around 2.2 V in the voltage window of 0–3.2 V at the current density of 200 mA g −1 . Good rate performance for the battery can be indicated by 29.7 mAh g −1 discharge capacity retention at 400 mA g −1 . It is noteworthy that the coulombic efficiency of the battery can reach as high as 93.9%, which is comparable to that of the corresponding DIBs using nonaqueous organic electrolytes.