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162 TRƯỜNG ĐẠI HỌC SƯ PHẠM KỸ THUẬT - ĐẠI HỌC ĐÀ NẴNG

Assemble the pouch cell battery. The pouch cell hydrothermal method. The measurement results reveal
configuration comprises a Zinc metal anode characteristic peaks of the lattice constants (hkl): (110),
(dimensions: 4 cm x 3 cm), a cathode electrode (101), (200), (111), (211), (220), (002), (221), (301),
consisting of MnO2 (dimensions: 4 cm x 3 cm), and a corresponding to 2 Theta angles of 28.725°, 37.425°,
separator made of 600-micrometer-thick paper 40.905°, 42.825°, 56.775°, 59.505°, 64.995°, 67.515°,
(dimensions: 5 cm x 4 cm). The cell utilizes the and 72.435°. Compared to the standard ICSD spectrum
electrolyte solutions mentioned previously. Layer the with code 03-065-2821, the synthesized sample is
cell components in the following sequence: cathode identified as manganese oxide with a space group of
electrode, separator, anode electrode. Next, P42/mnm. The crystal lattice structure of the β-MnO2
approximately 5 mL of electrolyte is added, and a pouch material, illustrated in Fig. 2b using VESTA software,
cell sealing machine (LiTh-China) is used to seal the depicts the arrangement of atoms in the crystal. The
packaging process. sharp, well-defined peaks and the absence of additional
2.3. Electrochemical characterization peaks indicate that the material has good purity and is
free from contamination by other substances.
The electrochemical measurements of pouch cell
Zn//β-MnO 2 were tested at a room temperature. The CV Fig. 2 (c-d) shows the FE-SEM results of the
measurement was conducted using the Ivium system synthesized β-MnO2 material. The FE-SEM images
over a potential range from 1.0 to 1.8 V for 3 cycles at a reveal that the synthesized material has a rod-like shape
scan rate of 0.1 mV/s. The charge/discharge with diameters ranging from 50 to 200 nm. The rods
measurement was performed at a current rate of 0.1 C exhibit varying sizes. Nonetheless, the absence of
(1C = 310 mA/g). impurities suggests that the synthesized sample is of high
purity and that the synthesis and washing procedures
3. RESULTS AND DISCUSSION were executed properly.
Fig. 2a presents the X-ray diffraction spectrum
results of β-MnO 2 materials synthesized via the one-step

Fig. 2. Showing a) XRD data, (b) an image of the crystal structure,
and (c-d) FE-SEM images of the produced β-MnO2 material

ISBN:978-604-80-9779-0