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HỘI THẢO QUỐC TẾ ATiGB LẦN THỨ CHÍN - The 9 ATiGB 2024 171

scale applications. Therefore, alternative battery ability of this electrolyte to inhibit the formation of
technologies that are low-cost and safe need to be Zn dendrites. [5-7]
developed.[1, 2] 2. EXPERIMENT
Zinc-ion batteries (ZIBs) are a promising option 2.1. Prepare symmetric pouch cells
due to their low cost, low flammability and toxicity,
environmental friendliness, and high specific The symmetric pouch cell system consists of zinc
capacity. However, the uncontrolled dendrite growth metal/separator/zinc metal. The separator used is filter
during the electrochemical process greatly hinders paper with a thickness of 200 μm. The dimensions of
their practical application. Therefore, researching the zinc electrode are 3 cm x 4 cm (length x height).
strategies to prevent Zn dendrite formation will The dimensions of the separator are 4 cm x 5 cm
significantly improve the performance of ZIBs. (length x width). The electrolyte used is 2M ZnSO 4
Adding additives to the electrolyte is a reliable and with 0% DMSO, 10% DMSO, 20% DMSO, 30%
low-cost method to address the issues of Zn dendrite DMSO, 40% DMSO, and 50% DMSO (volume
formation and adverse side reactions. Several percentage relative to water). The pouch case used
additives have been studied, such as MnSO 4, Na2SO4, has dimensions of 5 cm x 6 cm (length x width).
Gelatin, Ethylene Glycol (EG), and Sorbitol; they 2.2. Investigate the phenomenon of dendrite
have shown excellent effectiveness in limiting Zn suppression
dendrite formation and improving the electrochemical Symmetric pouch cell configuration: Perform
performance of zinc-ion batteries. [3, 4]
charge/discharge measurements over 50 hours (1-hour
Dimethyl Sulfoxide (DMSO) is an organic sulfur charge and 1-hour discharge cycles) at a current
compound with the formula (CH 3)2SO, a molecular density of 1.0 mA/cm² using electrolyte systems
weight of 78.14 g/mol. DMSO is a clear liquid that is containing 0% DMSO, 10% DMSO, 20% DMSO,
essentially odorless, has a flash point of 192°F, and is 30% DMSO, 40% DMSO, and 50% DMSO.
highly volatile. Its vapor is heavier than air. Skin Measurements are conducted at room temperature.
contact can cause irritation and burning sensations, 2.3. Examine dendrite formation on the zinc
leading to a garlic-like breath odor. It is an excellent metal surface
permeation solvent that can transport harmful
substances through the skin. High vapor concentrations After conducting the 50-hour stripping/plating
can cause headaches and dizziness. It acts as a polar measurement, the symmetric pouch cell configuration
aprotic solvent, capable of dissolving both polar and will undergo SEM analysis to examine the surface of
non-polar compounds, and is miscible with a wide the zinc electrode. XRD measurements will be used to
range of organic solvents and water. Because it is a investigate the formation of the SEI layer on the zinc
highly polar organic liquid, it is widely used as a electrode surface using electrolyte systems containing
chemical solvent. Due to its ability to penetrate 0% DMSO and 20% DMSO.
biological membranes, it is used as a vehicle for The X-ray diffraction (XRD) patterns were
topical pharmaceutical applications. It is also used to recorded using the PANalytical X’Pert PRO, a typical
protect tissue during cryopreservation. [11, 12] 1.8 kW sealed X-ray tube source. The source was
DMSO exhibits a range of pharmacological activities, CuKα, operating at 40 kV, 35 mA. Scanning electron
including analgesic and anti-inflammatory effects.[9] microscopy (SEM) was used for morphology and
Research using the additive DMSO brings many elemental mapping using a Hitachi TM4000 Plus
unique properties that can improve the performance (Hitachi Corporation, Japan).
of zinc-ion batteries. Firstly, it increases the 3. RESULTS AND DISCUSSION
reversibility of the zinc plating/stripping process,
thereby reducing the restriction of dendrite formation To investigate the ability to resist dendrite
that can pierce the separator and cause short circuits. formation in zinc-ion batteries, charge/discharge
Secondly, adding DMSO as an electrolyte additive measurements (charging for 1 hour, discharging for
can reduce the decomposition of the electrolyte- 1 hour) are carried out with a current density of
generating hydrogen gas (H2) and the corrosion of the 1.0 mA/cm² for 50 hours. The battery system includes
zinc metal, thereby improving the performance and a Zn metal// separator (200µm thick)// Zn metal.
Electrolyte systems of 2M ZnSO4/H2O-DMSO are
electrochemical stability of zinc-ion batteries.[10] In used with ratios of 10%, 20%, 30%, 40%, and 50%.
this study, we use the organic compound Dimethyl The measurements are conducted at room
Sulfoxide (DMSO) as an additive for the ZnSO 4 temperature. The dendrite suppression measurement
electrolyte, creating a base electrolyte of 2M ZnSO 4 results are shown in Fig. 1. Fig 1a illustrates the
and varying the volume percentage concentration of charge-discharge performance of the Zn//Zn cell
DMSO relative to water. From this, investigate the using 2M ZnSO4 - 0% DMSO electrolyte. In this

ISBN: 978-604-80-9779-0