Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Combined physical confinement and chemical adsorption on co-doped hollow TiO for long-term cycle lithium-sulfur batteries
Ist Teil von
Nanoscale, 2022-07, Vol.14 (26), p.941-948
Erscheinungsjahr
2022
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Lithium-sulfur (Li-S) batteries have long been expected to be promising high-energy-density secondary batteries because of their high theoretical specific capacity and element abundances. Yet, their poor cyclability and low rate-capacity strongly limited their practical application. Herein, a nitrogen and sulfur dual doped hollow TiO
2
sphere is designed and synthesized for the sulfur host. The dual doped hollow TiO
2
can enhance the adsorption ability of soluble lithium polysulfides, which effectively promote the conversion reaction of lithium polysulfides from high-order to low-order in Li-S batteries. What is more, the hollow spherical TiO
2
host provides a deposition space for lithium polysulfides and blocks polysulfide migration from the cathode to the electrolyte. Both theoretical calculations and experimental studies confirmed that the electrochemical properties of the sulfur electrode are significantly improved by the dual doped hollow TiO
2
sphere. The typical as-prepared dual doped hollow TiO
2
cathode coated sulfur has a capacity of 1258 mA h g
−1
for the first discharge and a capacity decay as low as 0.0648% per cycle during 500 cycles with a sulfur loading of 3.8 mg cm
−2
.
The co-dope hollow TiO
2
sphere is achieved
via
sacrificial template and thermal treatment methods, which remarkably enhances performances of Li-S battery due to the chemical absorption and physical containment to soluble lithium polysulfides.
Sprache
–
Identifikatoren
ISSN: 2040-3364
eISSN: 2040-3372
DOI: 10.1039/d2nr01815b
Titel-ID: cdi_rsc_primary_d2nr01815b
Format
–
Weiterführende Literatur
Empfehlungen zum selben Thema automatisch vorgeschlagen von bX