Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 7, Pages 8581-8591Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c01112
Keywords
Zn-ion battery; acid-alkaline electrolyte; MoS2@MnO2; cycling stability; energy density
Funding
- Defence Research and Development Organization (DRDO), Ministry of Defence, Government of India [DFTM/02/3111/M/01/JCBCAT/1288/D(RD), GAP219012]
- Basic Science Research Program through the National Research Foundation (NRF) of Korea - Ministry of Education [NRF-2019R1I1A3A02059471]
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In this study, an asymmetric-bipolar Zn-ion battery (ZiB) was proposed, in which the cathode and anode work at different pHs to improve energy density. Efficiency of Zn2+ accepting the host was enhanced through modification of the MoS2 layer. Investigation on charge storage mechanisms was conducted.
Aqueous rechargeable Zn-ion batteries (ZiBs) are of low cost and high safety but suffer from a narrow electrochemical stability window, leading to the low-energy density. The battery performance is impeded because of the sluggish intercalation kinetics associated with the Zn2+ ion at the cathode in the aqueous electrolyte. An asymmetric-bipolar ZiB (H cell) consisting of an acid-alkaline dual electrolyte separated by an ion-exchange membrane is proposed. The MoS2@delta-MnO2 cathode and the Zn anode operated at different pHs of the electrolyte, leading to a high cell voltage of 2.48 V. The efficiency of Zn2+ accepting the host is enhanced through structural modification of the MoS2 layer by MnO2. The deposition/dissolution and insertion/extraction charge storage mechanisms in H cells were investigated through ex situ field-emission scanning electron microscopy, atomic force microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, temperature-dependent activation energy calculation, and distribution relaxation time studies. The H cell delivered similar to 464 mAh g(-1) specific capacity and similar to 348 Wh kg(-1) energy density at 0.2 A g(-1) current density with similar to 99.9% Coulombic efficiency and exhibited superior cycling stability with similar to 74% capacity retention after 5000 charge-discharge cycles.
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