Introduction of a nitrate anion with solubility mediator in a carbonate-based electrolyte for a stable potassium metal anode
Journal article, 2024

In this study, sodium nitrate (NaNO3) dissolves in a carbonate electrolyte for K-metal batteries (KMBs) using a dimethylacetamide (DMA) solvent with a higher Gutmann donor number than that of NO3−. The K-metal anode in 0.02 M NaNO3 electrolyte exhibits enhanced stability due to the modified solid-electrolyte interphase (SEI) layer resulting from the preferential reduction of NaNO3. Reduced NaNO3 forms ionically conductive and mechanically robust compounds in the SEI layer. This compound plays a critical role in altering the morphology of electrodeposited K-metal from dendritic to spherical, reducing the barrier energy of nucleation potential for K-ions. These unique features make K-metal highly resistant to dendrite formation and aggressive electrolyte chemistry. Therefore, the K-metal anode in the proposed electrolyte containing 0.02 M NaNO3 additive ensures excellent cycle life with stable Coulombic efficiency in both symmetrical K/K half cells and full-cells coupled with a Prussian green FeFe(CN)6 cathode.

Solid electrolyte interphase layer

Phase-field modelling

K-metal anodes

Dendrite

NaNO additive 3

Author

Jimin Park

Hanyang University

Hyokyeong Kang

Hanyang University

Marco Agostini

Sapienza University of Rome

Chalmers, Physics, Materials Physics

Shizhao Xiong

Kunming University of Science and Technology

Shivam Kansara

Hanyang University

Xieyu Xu

Xi'an Jiaotong University

Yangyang Liu

Xi'an Jiaotong University

Jang Yeon Hwang

Hanyang University

Energy Storage Materials

2405-8297 (eISSN)

Vol. 69 103443

Subject Categories

Materials Chemistry

Areas of Advance

Materials Science

DOI

10.1016/j.ensm.2024.103443

More information

Latest update

5/21/2024