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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

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

Project

<a href="/en/project/GA20-03564S" target="_blank" >GA20-03564S: New host materials and structures for advanced lithium-sulfur batteries</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

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

Name of the periodical

Materials Chemistry and Physics

ISSN

0254-0584

e-ISSN

1879-3312

Volume of the periodical

296

Issue of the periodical within the volume

FEB 2023

Country of publishing house

CH - SWITZERLAND

Number of pages

8

Pages from-to

127246

UT code for WoS article

000910716800001

EID of the result in the Scopus database

2-s2.0-85145581476