Preparation and properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte by wet-chemical method
For advanced all-solid-state lithium batteries, the solid electrolyte is one of the most critical factors that significantly affect the performance of batteries. The Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid-state electrolyte was successfully prepared by wet...
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| Format: | Article |
| Language: | zho |
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Journal of Materials Engineering
2021-04-01
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| Series: | Cailiao gongcheng |
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| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000126 |
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| author | LIU Wei-ming LI Jiu-yong ZHANG Xiao-feng MA Yi-bo WEI You-xiu ZHANG Xuan YAN Yue |
| author_facet | LIU Wei-ming LI Jiu-yong ZHANG Xiao-feng MA Yi-bo WEI You-xiu ZHANG Xuan YAN Yue |
| author_sort | LIU Wei-ming |
| collection | DOAJ |
| description | For advanced all-solid-state lithium batteries, the solid electrolyte is one of the most critical factors that significantly affect the performance of batteries. The Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid-state electrolyte was successfully prepared by wet-chemical synthesis and subsequent vacuum heat-treatment method, taking P<sub>2</sub>S<sub>5</sub>, Li<sub>2</sub>S and LiI as the raw materials and tetrahydrofuran as the reaction solvent. The morphology, elements distribution, and phase composition of the electrolyte sample were studied by means of simultaneous thermal analysis, powder X-ray diffraction, Raman spectroscopy, scanning electron microscope, and energy dispersive spectrometer. The electrochemical properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte were analyzed by AC impedance measurements, cyclic voltammetry, and DC polarization test. The results show that the optimal heat-treatment temperature of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte is 230 ℃ and the obtained sample has nanoporous structure and each kind of elements is uniformly distributed in it. Electrochemical tests show that the ionic conductivity of the electrolyte at 25 ℃ is 1.63×10<sup>-4</sup> S·cm<sup>-1</sup>, the activation energy is 0.388 eV, the electrochemical window reaches 5 V and the lithium ion transport number is larger than 0.999. In addition, the symmetrical cell assembled with the electrolyte and lithium metal can be charged and discharged stably for more than 262 cycles (525 h). This proves that the Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte prepared by this method has excellent electrochemical stability and chemical compatibility with the metal lithium anode. |
| first_indexed | 2024-04-11T02:54:52Z |
| format | Article |
| id | doaj.art-1f01e8a7da6a4919bd27db93b3303c93 |
| institution | Directory Open Access Journal |
| issn | 1001-4381 1001-4381 |
| language | zho |
| last_indexed | 2024-04-11T02:54:52Z |
| publishDate | 2021-04-01 |
| publisher | Journal of Materials Engineering |
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| series | Cailiao gongcheng |
| spelling | doaj.art-1f01e8a7da6a4919bd27db93b3303c932023-01-02T15:28:09ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43811001-43812021-04-0149415916610.11868/j.issn.1001-4381.2020.00012620210418Preparation and properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte by wet-chemical methodLIU Wei-ming0LI Jiu-yong1ZHANG Xiao-feng2MA Yi-bo3WEI You-xiu4ZHANG Xuan5YAN Yue6AECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaAECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaAECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaAECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaAECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaAECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaAECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaFor advanced all-solid-state lithium batteries, the solid electrolyte is one of the most critical factors that significantly affect the performance of batteries. The Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid-state electrolyte was successfully prepared by wet-chemical synthesis and subsequent vacuum heat-treatment method, taking P<sub>2</sub>S<sub>5</sub>, Li<sub>2</sub>S and LiI as the raw materials and tetrahydrofuran as the reaction solvent. The morphology, elements distribution, and phase composition of the electrolyte sample were studied by means of simultaneous thermal analysis, powder X-ray diffraction, Raman spectroscopy, scanning electron microscope, and energy dispersive spectrometer. The electrochemical properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte were analyzed by AC impedance measurements, cyclic voltammetry, and DC polarization test. The results show that the optimal heat-treatment temperature of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte is 230 ℃ and the obtained sample has nanoporous structure and each kind of elements is uniformly distributed in it. Electrochemical tests show that the ionic conductivity of the electrolyte at 25 ℃ is 1.63×10<sup>-4</sup> S·cm<sup>-1</sup>, the activation energy is 0.388 eV, the electrochemical window reaches 5 V and the lithium ion transport number is larger than 0.999. In addition, the symmetrical cell assembled with the electrolyte and lithium metal can be charged and discharged stably for more than 262 cycles (525 h). This proves that the Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte prepared by this method has excellent electrochemical stability and chemical compatibility with the metal lithium anode.http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000126solid electrolyteli<sub>7</sub>p<sub>2</sub>s<sub>8</sub>itetrahydrofuranwet-chemical method |
| spellingShingle | LIU Wei-ming LI Jiu-yong ZHANG Xiao-feng MA Yi-bo WEI You-xiu ZHANG Xuan YAN Yue Preparation and properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte by wet-chemical method Cailiao gongcheng solid electrolyte li<sub>7</sub>p<sub>2</sub>s<sub>8</sub>i tetrahydrofuran wet-chemical method |
| title | Preparation and properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte by wet-chemical method |
| title_full | Preparation and properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte by wet-chemical method |
| title_fullStr | Preparation and properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte by wet-chemical method |
| title_full_unstemmed | Preparation and properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte by wet-chemical method |
| title_short | Preparation and properties of Li<sub>7</sub>P<sub>2</sub>S<sub>8</sub>I solid electrolyte by wet-chemical method |
| title_sort | preparation and properties of li sub 7 sub p sub 2 sub s sub 8 sub i solid electrolyte by wet chemical method |
| topic | solid electrolyte li<sub>7</sub>p<sub>2</sub>s<sub>8</sub>i tetrahydrofuran wet-chemical method |
| url | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000126 |
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