TiO2 top layer improving the performance of sulfur/carbon composite cathode in Li-sulfur cells

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F23%3A00566054" target="_blank" >RIV/61388955:_____/23:00566054 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0337494" target="_blank" >https://hdl.handle.net/11104/0337494</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matchemphys.2022.127246" target="_blank" >10.1016/j.matchemphys.2022.127246</a>

Jazyk výsledku

angličtina

Název v původním jazyce

TiO2 top layer improving the performance of sulfur/carbon composite cathode in Li-sulfur cells

Popis výsledku v původním jazyce

Facile preparation of the TiO2 top layer on the sulfur/carbon cathode in a Li-sulfur battery is presented. The layer significantly improves the initial charge capacity of composite cathodes. To demonstrate the versatility of the TiO2 top layer, its effect is evaluated on the sulfur composite cathodes with three kinds of carbonaceous additives. The electrochemical performance of these sulfur composite cathodes in the Li-sulfur battery is studied by cyclic voltammetry, galvanostatic chronopotentiometry, and electrochemical impedance spectroscopy. The sulfur/composite cathode with TOB carbon provides the highest charge capacity of 816 mAh g−1 from cyclic voltammetry, however, due to its structural disorder, exhibits the most pronounced capacity fade during galvanostatic cycling at 0.1C rate. The graphene nanoplatelets/sulfur composite cathode provides a charging capacity of 739 mAh g−1 in cyclic voltammetry and excellent cycling stability over 100 cycles of galvanostatic charging/discharging. A TiO2 top layer on the cathode and a TiO2-modified separator increase substantially the initial charge capacities of sulfur composite cathodes with all three kinds of carbon. The voltammetric charge capacities are 1427 mAh g−1, 1349 mAh g−1, and 952 mAh g−1 for TOB carbon, graphene nanoplatelets, and Penta carbon, respectively. This represents the relative enhancement by 75%, 83%, and 44%, respectively, as referenced to the cells with titania-free materials. Galvanostatic chronopotentiometry confirms the beneficial effect of inorganic additive on the charge capacity of Penta carbon and graphene nanoplatelets, however, the long-term cycling stability of the composite electrode is determined exclusively by the carbonaceous additive.

Název v anglickém jazyce

TiO2 top layer improving the performance of sulfur/carbon composite cathode in Li-sulfur cells

Popis výsledku anglicky

Facile preparation of the TiO2 top layer on the sulfur/carbon cathode in a Li-sulfur battery is presented. The layer significantly improves the initial charge capacity of composite cathodes. To demonstrate the versatility of the TiO2 top layer, its effect is evaluated on the sulfur composite cathodes with three kinds of carbonaceous additives. The electrochemical performance of these sulfur composite cathodes in the Li-sulfur battery is studied by cyclic voltammetry, galvanostatic chronopotentiometry, and electrochemical impedance spectroscopy. The sulfur/composite cathode with TOB carbon provides the highest charge capacity of 816 mAh g−1 from cyclic voltammetry, however, due to its structural disorder, exhibits the most pronounced capacity fade during galvanostatic cycling at 0.1C rate. The graphene nanoplatelets/sulfur composite cathode provides a charging capacity of 739 mAh g−1 in cyclic voltammetry and excellent cycling stability over 100 cycles of galvanostatic charging/discharging. A TiO2 top layer on the cathode and a TiO2-modified separator increase substantially the initial charge capacities of sulfur composite cathodes with all three kinds of carbon. The voltammetric charge capacities are 1427 mAh g−1, 1349 mAh g−1, and 952 mAh g−1 for TOB carbon, graphene nanoplatelets, and Penta carbon, respectively. This represents the relative enhancement by 75%, 83%, and 44%, respectively, as referenced to the cells with titania-free materials. Galvanostatic chronopotentiometry confirms the beneficial effect of inorganic additive on the charge capacity of Penta carbon and graphene nanoplatelets, however, the long-term cycling stability of the composite electrode is determined exclusively by the carbonaceous additive.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

<a href="/cs/project/GA20-03564S" target="_blank" >GA20-03564S: Nové hostitelské materiály a struktury pro pokročilé baterie lithium-síra</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials Chemistry and Physics

ISSN

0254-0584

e-ISSN

1879-3312

Svazek periodika

296

Číslo periodika v rámci svazku

FEB 2023

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

8

Strana od-do

127246

Kód UT WoS článku

000910716800001

EID výsledku v databázi Scopus

2-s2.0-85145581476