SPECIFIC CHARACTERISTICS OF SULFUR ELECTRODES IN SALT-SOLVATE ELECTROLYTES
The influence of the technological parameters of the positive electrode and the composition of the salt-solvate electrolyte LiTFSI – TEGDME on the specific characteristics of sulfur electrodes during galvanostatic cycling in lithium-sulfur cells was studied. The dependences of the change in...
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| Дата: | 2023 |
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| Формат: | Стаття |
| Мова: | English |
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V.I.Vernadsky Institute of General and Inorganic Chemistry
2023
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| Назва журналу: | Ukrainian Chemistry Journal |
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oai:ojs2.1444248.nisspano.web.hosting-test.net:article-5392023-06-14T19:46:44Z SPECIFIC CHARACTERISTICS OF SULFUR ELECTRODES IN SALT-SOLVATE ELECTROLYTES Globa, Nataliy Shmatok, Yurii Sirosh, Vitalii Kirillov, Sviatoslav salt-solvate, aprotic solvent, polysulfides, electrical conductivity, lithium-sulfur battery The influence of the technological parameters of the positive electrode and the composition of the salt-solvate electrolyte LiTFSI – TEGDME on the specific characteristics of sulfur electrodes during galvanostatic cycling in lithium-sulfur cells was studied. The dependences of the change in specific capacity on the cathode composition, the charge-discharge current density, and the preservation of the charged state were discussed. It was found that the concentration of salt in salt-solvate electrolyte determines the specific characteristics of sulfur and affects its stability during cycling. It was determined that the most stable specific capacity and high Coulombic efficiency of the discharge/charge process of lithium-sulfur cells under long-term cycling conditions were ensured at lithium salt concentration of 0.4 molar fractions (m.f.) in the salt-solvate electrolyte. The positive effect of reducing the size of sulfur particles and optimizing its concentration and the composition of conductive additives in the cathode on the specific characteristics of sulfur-containing electrodes during cycling was shown. It was determined that reducing the size of sulfur particles from δS ≤ 150 μm to δS ≤ 40 μm contributes to an increase in the specific capacity of lithium-sulfur cells by approximately 20% and had a positive effect on their stability during cycling. It was established that increasing the concentration of sulfur in the cathode from 50% to 70% by mass leads to a significant decreased in the specific capacity of lithium-sulfur cells as a result of accelerated passivation of the electrode by poorly soluble lithium polysulfides. It was shown that in salt-solvate electrolytes a high level of retention of specific capacity was achieved under the conditions of long-term storage of a charged sulfur cathode at the temperature of ~30 °C. With a sulfur content of 50% and 70% by mass in the composition of the cathode with a fractional composition of δS ≤ 80 μm, the return of the specific capacity was over 97%. V.I.Vernadsky Institute of General and Inorganic Chemistry 2023-04-28 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/539 10.33609/2708-129X.89.03.2023.37-54 Ukrainian Chemistry Journal; Vol. 89 No. 3 (2023): Ukrainian Chemistry Journal; 37-54 Украинский химический журнал; Том 89 № 3 (2023): Ukrainian Chemistry Journal; 37-54 Український хімічний журнал; Том 89 № 3 (2023): Український хімічний журнал; 37-54 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/539/274 |
| institution |
Ukrainian Chemistry Journal |
| baseUrl_str |
|
| datestamp_date |
2023-06-14T19:46:44Z |
| collection |
OJS |
| language |
English |
| topic_facet |
salt-solvate aprotic solvent polysulfides electrical conductivity lithium-sulfur battery |
| format |
Article |
| author |
Globa, Nataliy Shmatok, Yurii Sirosh, Vitalii Kirillov, Sviatoslav |
| spellingShingle |
Globa, Nataliy Shmatok, Yurii Sirosh, Vitalii Kirillov, Sviatoslav SPECIFIC CHARACTERISTICS OF SULFUR ELECTRODES IN SALT-SOLVATE ELECTROLYTES |
| author_facet |
Globa, Nataliy Shmatok, Yurii Sirosh, Vitalii Kirillov, Sviatoslav |
| author_sort |
Globa, Nataliy |
| title |
SPECIFIC CHARACTERISTICS OF SULFUR ELECTRODES IN SALT-SOLVATE ELECTROLYTES |
| title_short |
SPECIFIC CHARACTERISTICS OF SULFUR ELECTRODES IN SALT-SOLVATE ELECTROLYTES |
| title_full |
SPECIFIC CHARACTERISTICS OF SULFUR ELECTRODES IN SALT-SOLVATE ELECTROLYTES |
| title_fullStr |
SPECIFIC CHARACTERISTICS OF SULFUR ELECTRODES IN SALT-SOLVATE ELECTROLYTES |
| title_full_unstemmed |
SPECIFIC CHARACTERISTICS OF SULFUR ELECTRODES IN SALT-SOLVATE ELECTROLYTES |
| title_sort |
specific characteristics of sulfur electrodes in salt-solvate electrolytes |
| description |
The influence of the technological parameters of the positive electrode and the composition of the salt-solvate electrolyte LiTFSI – TEGDME on the specific characteristics of sulfur electrodes during galvanostatic cycling in lithium-sulfur cells was studied. The dependences of the change in specific capacity on the cathode composition, the charge-discharge current density, and the preservation of the charged state were discussed.
It was found that the concentration of salt in salt-solvate electrolyte determines the specific characteristics of sulfur and affects its stability during cycling. It was determined that the most stable specific capacity and high Coulombic efficiency of the discharge/charge process of lithium-sulfur cells under long-term cycling conditions were ensured at lithium salt concentration of 0.4 molar fractions (m.f.) in the salt-solvate electrolyte.
The positive effect of reducing the size of sulfur particles and optimizing its concentration and the composition of conductive additives in the cathode on the specific characteristics of sulfur-containing electrodes during cycling was shown. It was determined that reducing the size of sulfur particles from δS ≤ 150 μm to δS ≤ 40 μm contributes to an increase in the specific capacity of lithium-sulfur cells by approximately 20% and had a positive effect on their stability during cycling.
It was established that increasing the concentration of sulfur in the cathode from 50% to 70% by mass leads to a significant decreased in the specific capacity of lithium-sulfur cells as a result of accelerated passivation of the electrode by poorly soluble lithium polysulfides.
It was shown that in salt-solvate electrolytes a high level of retention of specific capacity was achieved under the conditions of long-term storage of a charged sulfur cathode at the temperature of ~30 °C. With a sulfur content of 50% and 70% by mass in the composition of the cathode with a fractional composition of δS ≤ 80 μm, the return of the specific capacity was over 97%. |
| publisher |
V.I.Vernadsky Institute of General and Inorganic Chemistry |
| publishDate |
2023 |
| url |
https://ucj.org.ua/index.php/journal/article/view/539 |
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