TY  - JOUR
AU  - Gao, Ping
AU  - Zhang, Fei
AU  - Wang, Xingchao
AU  - Wu, Miaomiao
AU  - Xiang, Qian
AU  - Yang, Aikai
AU  - Sun, Ying
AU  - Guo, Jixi
AU  - Huang, Yudai
TI  - Ultrastable Dendrite-Free Potassium Metal Batteries Enabled by Weakly-Solvated Electrolyte
JO  - ACS nano
VL  - 17
IS  - 20
SN  - 1936-0851
CY  - Washington, DC
PB  - Soc.
M1  - FZJ-2024-02474
SP  - 20325 - 20333
PY  - 2023
AB  - Potassium (K) metal is considered one of the most promising anodes for potassium metal batteries (PMBs) because of its abundant and low-cost advantages but suffers from serious dendritic growth and parasitic reactions, resulting in poor cyclability, low Coulombic efficiency (CE), and safety concerns. In this work, we report a localized high-concentration electrolyte (LHCE) consisting of potassium bis(fluorosulfonyl)imide (KFSI) in a cosolvent of 1,2-dimethoxyethane (DME) and 1,1,2,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) to solve the problems of PMBs. TTE as a diluent not only endows LHCE with advantages of low viscosity, good wettability, and improved conductivity but also solves the dendrite problem pertaining to K metal anodes. Using the formulation of LHCE, a CE of 98% during 800 cycles in the K||Cu cell and extremely stable cycling of over 2000 h in the K||K symmetric cell are achieved at a current density of 0.1 mA cm–2. In addition, the LHCE shows good compatibility with a Prussian Blue cathode, allowing almost 99% CE for the K||KFeIIFeIII(CN)6 full cell during 100 cycles. This promising electrolyte design realizes high-safety and energy-dense PMBs.
LB  - PUB:(DE-HGF)16
C6  - 37830495
UR  - <Go to ISI:>//WOS:001090952700001
DO  - DOI:10.1021/acsnano.3c06368
UR  - https://juser.fz-juelich.de/record/1024808
ER  -