Sulfide synergistic electrochemical activity for high-performance alkaline rechargeable microbatteries
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Sulfide synergistic electrochemical activity for highperformance alkaline rechargeable microbatteries Hui Yuan1, Xiaocong Tian2, Peipei Han1, Cong Li1, Xiaobin Liao3, Liqiang Mai4,*, and Rusen Yang1,* 1
School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, People’s Republic of China Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, People’s Republic of China 3 State Key Laboratory of Silicate Materials for Architectures, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, People’s Republic of China 4 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, People’s Republic of China 2
Received: 19 May 2020
ABSTRACT
Accepted: 30 August 2020
Alkaline rechargeable microbatteries have attracted considerable and sustained attention in recent years. However, the complicated fabrication process and the limited specific capacitance of electrodes are still key problems for the development of microbatteries. Herein, we develop a simple approach to enhance electrochemical activity of electrodes via rational design of material components. A sulfide synergistic bimetallic electrode composed of Ni-Co layered double hydroxides (NiCo-LDHs) and Co4S3 composites (NiCo-LDHs-S) is prepared by one-step electrodeposition. Thanks to the richer redox couples in NiCo-LDHs-S and high conductivity of Co4S3, the areal capacitance of NiCoLDHs-S cathode is * 5.8 times, * 19.7 times and 1.5 times as high as that of electrodes based on cobalt sulfur composites (Co-O-S), nickel sulfur composites (Ni-O-S) and NiCo-LDHs, respectively. A carbon-modified Fe3O4 (Fe3O4@C) anode is prepared to promote electron transfer, leading to an areal capacitance of 207.2 mC cm-2 at a current density of 2 mA cm-2. An efficient alkaline rechargeable microbattery using NiCo-LDHs-S as a cathode and Fe3O4@C as an anode is obtained and shows an areal capacitance of 61.7 mC cm-2 and an energy density of 16.4 lWh cm-2 (1.0 mW cm-2).
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Naiqin Zhao.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05191-4
J Mater Sci
Introduction The rapid development of portable electronic devices stimulates the development of energy storage devices with small size, easy fabrication and high performance [1, 2]. Rechargeable microbatteries have attracted much attention in recent years due to their long lifetime, less life cycle cost and low environmental impact [3, 4]. Microsupercapacitors show the advantage of high power density, rapid charge/discharge and super cycle stability, but their energy density needs to be improved [5, 6]. In comparison, a microbattery exhibits higher energy density. However, toxicity of electrolyte and low power density are key problems for a
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