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Title: Dendrite-Free Potassium–Oxygen Battery Based on a Liquid Alloy Anode

Abstract

The safety issue caused by the dendrite growth is not only a key research problem in lithium-ion batteries but also a critical concern in alkali metal (i.e., Li, Na, and K) oxygen batteries where a solid metal is usually used as the anode. Herein, we demonstrate the first dendrite-free K-O-2 battery at ambient temperature based on a liquid Na K alloy anode. The unique liquid liquid connection between the liquid alloy and the electrolyte in our alloy anode-based battery provides a homogeneous and robust anode electrolyte interface. Meanwhile, we manage to show that the Na K alloy is only compatible in K-O-2 batteries but not in Na-O-2 batteries, which is mainly attributed to the stronger reducibility of potassium and relatively more favorable thermodynamic formation of KO, over NaO2 during the discharge process. It is observed that our K-O-2 battery based on a liquid alloy anode shows a long cycle life (over 620 h) and a low discharge charge overpotential (about 0.05 V at initial cycles). Moreover, the mechanism investigation into the K-O-2 cell degradation shows that the 02 crossover effect and the ether electrolyte instability are the critical problems for K-O-2 batteries. In a word, this study provides a newmore » route to solve the problems caused by the dendrite growth in alkali metal oxygen batteries.« less

Authors:
 [1];  [2];  [3];  [4];  [1];  [3];  [3]; ORCiD logo [5]; ORCiD logo [3];  [1]
  1. Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  2. Department of Physics and Astronomy, California State University Northridge, 18111 Nordhoff Street, Northridge, California 91330-8268, United States
  3. Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
  4. Materials Science Institute, PCFM Lab and GDHPPC Lab, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
  5. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Joint Center for Energy Storage Research (JCESR); National Key Basic Research Program of China; National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1411039
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Applied Materials and Interfaces; Journal Volume: 9; Journal Issue: 37
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Dendrite growth; K-02 battery; Liquid-liquid interface; Na-K alloy; superoxide

Citation Formats

Yu, Wei, Lau, Kah Chun, Lei, Yu, Liu, Ruliang, Qin, Lei, Yang, Wei, Li, Baohua, Curtiss, Larry A., Zhai, Dengyun, and Kang, Feiyu. Dendrite-Free Potassium–Oxygen Battery Based on a Liquid Alloy Anode. United States: N. p., 2017. Web. doi:10.1021/acsami.7b08962.
Yu, Wei, Lau, Kah Chun, Lei, Yu, Liu, Ruliang, Qin, Lei, Yang, Wei, Li, Baohua, Curtiss, Larry A., Zhai, Dengyun, & Kang, Feiyu. Dendrite-Free Potassium–Oxygen Battery Based on a Liquid Alloy Anode. United States. doi:10.1021/acsami.7b08962.
Yu, Wei, Lau, Kah Chun, Lei, Yu, Liu, Ruliang, Qin, Lei, Yang, Wei, Li, Baohua, Curtiss, Larry A., Zhai, Dengyun, and Kang, Feiyu. Mon . "Dendrite-Free Potassium–Oxygen Battery Based on a Liquid Alloy Anode". United States. doi:10.1021/acsami.7b08962.
@article{osti_1411039,
title = {Dendrite-Free Potassium–Oxygen Battery Based on a Liquid Alloy Anode},
author = {Yu, Wei and Lau, Kah Chun and Lei, Yu and Liu, Ruliang and Qin, Lei and Yang, Wei and Li, Baohua and Curtiss, Larry A. and Zhai, Dengyun and Kang, Feiyu},
abstractNote = {The safety issue caused by the dendrite growth is not only a key research problem in lithium-ion batteries but also a critical concern in alkali metal (i.e., Li, Na, and K) oxygen batteries where a solid metal is usually used as the anode. Herein, we demonstrate the first dendrite-free K-O-2 battery at ambient temperature based on a liquid Na K alloy anode. The unique liquid liquid connection between the liquid alloy and the electrolyte in our alloy anode-based battery provides a homogeneous and robust anode electrolyte interface. Meanwhile, we manage to show that the Na K alloy is only compatible in K-O-2 batteries but not in Na-O-2 batteries, which is mainly attributed to the stronger reducibility of potassium and relatively more favorable thermodynamic formation of KO, over NaO2 during the discharge process. It is observed that our K-O-2 battery based on a liquid alloy anode shows a long cycle life (over 620 h) and a low discharge charge overpotential (about 0.05 V at initial cycles). Moreover, the mechanism investigation into the K-O-2 cell degradation shows that the 02 crossover effect and the ether electrolyte instability are the critical problems for K-O-2 batteries. In a word, this study provides a new route to solve the problems caused by the dendrite growth in alkali metal oxygen batteries.},
doi = {10.1021/acsami.7b08962},
journal = {ACS Applied Materials and Interfaces},
number = 37,
volume = 9,
place = {United States},
year = {Mon Mar 20 00:00:00 EDT 2017},
month = {Mon Mar 20 00:00:00 EDT 2017}
}