Preparation of Li<sub>2</sub>S-AlI<sub>3</sub>-LiI Composite Solid Electrolyte and Its Application in All-Solid-State Li-S Battery
Novel (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·yLiI composite solid electrolytes (y = 5, 10, 15) were prepared by mechannochemical synthesis. XRD results showed that the pattern of 80Li<sub>2</sub>S − 20AlI<sub>3</sub> was similar to that of AlI<sub&...
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MDPI AG
2023-05-01
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| Series: | Batteries |
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| Online Access: | https://www.mdpi.com/2313-0105/9/6/290 |
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| author | Tran Anh Tu Nguyen Huu Huy Phuc Luong Thi Quynh Anh Tran Viet Toan |
| author_facet | Tran Anh Tu Nguyen Huu Huy Phuc Luong Thi Quynh Anh Tran Viet Toan |
| author_sort | Tran Anh Tu |
| collection | DOAJ |
| description | Novel (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·yLiI composite solid electrolytes (y = 5, 10, 15) were prepared by mechannochemical synthesis. XRD results showed that the pattern of 80Li<sub>2</sub>S − 20AlI<sub>3</sub> was similar to that of AlI<sub>3</sub>, which means that Li<sub>2</sub>S was dissolved in AlI<sub>3</sub> matrix during preparation. This structure was still maintained after LiI addition. The current measured at constant applied DC voltage indicated that (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·yLiI composites are intrinsically pure Li-ion conductors. The ionic conductivity at 25 °C of y = 10 was about 2.3 × 10<sup>−4</sup> Scm<sup>−1</sup>, which was about three times higher than that of y = 0. The conductivity of y = 10 increased 20 times to 2.2 × 10<sup>−3</sup> Scm<sup>−1</sup> at 70 °C. These values were highest among those observed from Li<sub>2</sub>S-based materials. It was revealed that Li-ion moves in 80Li<sub>2</sub>S − 20AlI<sub>3</sub> by a hoping mechanism, while the lattice dipoles are the origin of Li-ion movement in (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·yLiI. The polarization measurements using Liǀ90 (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·10LiI ǀLi and LiǀLi<sub>6</sub>PS<sub>5</sub>Clǀ90 (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·10LiIǀLi<sub>6</sub>PS<sub>5</sub>ClǀLi cells proved that 90 (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·10LiI reacts with Li metal, but it is relatively stable at a low voltage. Sample y = 10 was also employed as a solid electrolyte in the positive electrode of a solid-state Li-S battery to study its stability in the voltage range of the positive electrode. CuS and Li<sub>4.4</sub>Si were the electrode-active materials. The cell was cycled in CC-CV mode at 1.0 mA cm<sup>−2</sup> (CC) with a cut-off voltage of 1.0–2.3 V. The cell delivered a stable capacity of about 400 mAh g<sup>−1</sup><sub>CuS</sub> after 40 cycles. |
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| spelling | doaj.art-d9e34aaecdc5467c8abbeaef728443a52023-11-18T09:17:32ZengMDPI AGBatteries2313-01052023-05-019629010.3390/batteries9060290Preparation of Li<sub>2</sub>S-AlI<sub>3</sub>-LiI Composite Solid Electrolyte and Its Application in All-Solid-State Li-S BatteryTran Anh Tu0Nguyen Huu Huy Phuc1Luong Thi Quynh Anh2Tran Viet Toan3Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Str., Dist. 10, Ho Chi Minh City 70000, VietnamFaculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Str., Dist. 10, Ho Chi Minh City 70000, VietnamFaculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Str., Dist. 10, Ho Chi Minh City 70000, VietnamFaculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Str., Dist. 10, Ho Chi Minh City 70000, VietnamNovel (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·yLiI composite solid electrolytes (y = 5, 10, 15) were prepared by mechannochemical synthesis. XRD results showed that the pattern of 80Li<sub>2</sub>S − 20AlI<sub>3</sub> was similar to that of AlI<sub>3</sub>, which means that Li<sub>2</sub>S was dissolved in AlI<sub>3</sub> matrix during preparation. This structure was still maintained after LiI addition. The current measured at constant applied DC voltage indicated that (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·yLiI composites are intrinsically pure Li-ion conductors. The ionic conductivity at 25 °C of y = 10 was about 2.3 × 10<sup>−4</sup> Scm<sup>−1</sup>, which was about three times higher than that of y = 0. The conductivity of y = 10 increased 20 times to 2.2 × 10<sup>−3</sup> Scm<sup>−1</sup> at 70 °C. These values were highest among those observed from Li<sub>2</sub>S-based materials. It was revealed that Li-ion moves in 80Li<sub>2</sub>S − 20AlI<sub>3</sub> by a hoping mechanism, while the lattice dipoles are the origin of Li-ion movement in (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·yLiI. The polarization measurements using Liǀ90 (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·10LiI ǀLi and LiǀLi<sub>6</sub>PS<sub>5</sub>Clǀ90 (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·10LiIǀLi<sub>6</sub>PS<sub>5</sub>ClǀLi cells proved that 90 (80Li<sub>2</sub>S − 20AlI<sub>3</sub>)·10LiI reacts with Li metal, but it is relatively stable at a low voltage. Sample y = 10 was also employed as a solid electrolyte in the positive electrode of a solid-state Li-S battery to study its stability in the voltage range of the positive electrode. CuS and Li<sub>4.4</sub>Si were the electrode-active materials. The cell was cycled in CC-CV mode at 1.0 mA cm<sup>−2</sup> (CC) with a cut-off voltage of 1.0–2.3 V. The cell delivered a stable capacity of about 400 mAh g<sup>−1</sup><sub>CuS</sub> after 40 cycles.https://www.mdpi.com/2313-0105/9/6/290Li<sub>2</sub>S conductivityLi-S batterysolid-state batterycomplex impedance spectroscopy |
| spellingShingle | Tran Anh Tu Nguyen Huu Huy Phuc Luong Thi Quynh Anh Tran Viet Toan Preparation of Li<sub>2</sub>S-AlI<sub>3</sub>-LiI Composite Solid Electrolyte and Its Application in All-Solid-State Li-S Battery Batteries Li<sub>2</sub>S conductivity Li-S battery solid-state battery complex impedance spectroscopy |
| title | Preparation of Li<sub>2</sub>S-AlI<sub>3</sub>-LiI Composite Solid Electrolyte and Its Application in All-Solid-State Li-S Battery |
| title_full | Preparation of Li<sub>2</sub>S-AlI<sub>3</sub>-LiI Composite Solid Electrolyte and Its Application in All-Solid-State Li-S Battery |
| title_fullStr | Preparation of Li<sub>2</sub>S-AlI<sub>3</sub>-LiI Composite Solid Electrolyte and Its Application in All-Solid-State Li-S Battery |
| title_full_unstemmed | Preparation of Li<sub>2</sub>S-AlI<sub>3</sub>-LiI Composite Solid Electrolyte and Its Application in All-Solid-State Li-S Battery |
| title_short | Preparation of Li<sub>2</sub>S-AlI<sub>3</sub>-LiI Composite Solid Electrolyte and Its Application in All-Solid-State Li-S Battery |
| title_sort | preparation of li sub 2 sub s ali sub 3 sub lii composite solid electrolyte and its application in all solid state li s battery |
| topic | Li<sub>2</sub>S conductivity Li-S battery solid-state battery complex impedance spectroscopy |
| url | https://www.mdpi.com/2313-0105/9/6/290 |
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