In Situ Formed Ir3Li Nanoparticles as Active Cathode Material in Li–Oxygen Batteries

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F19%3A00511372" target="_blank" >RIV/61388955:_____/19:00511372 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0301654" target="_blank" >http://hdl.handle.net/11104/0301654</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpca.9b06875" target="_blank" >10.1021/acs.jpca.9b06875</a>

Jazyk výsledku

angličtina

Název v původním jazyce

In Situ Formed Ir3Li Nanoparticles as Active Cathode Material in Li–Oxygen Batteries

Popis výsledku v původním jazyce

Lithium–oxygen (Li–O2) batteries are a promising class of rechargeable Li batteries with a potentially very high achievable energy density. One of the major challenges for Li–O2 batteries is the high charge overpotential, which results in a low energy efficiency. In this work size-selected subnanometer Ir clusters are used to investigate cathode materials that can help control lithium superoxide formation during discharge, which has good electronic conductivity needed for low charge potentials. It is found that Ir particles can lead to lithium superoxide formation as the discharge product with Ir particle sizes of ∼1.5 nm giving the lowest charge potentials. During discharge these 1.5 nm Ir nanoparticles surprisingly evolve to larger ones while incorporating Li to form core–shell structures with Ir3Li shells, which probably act as templates for growth of lithium superoxide during discharge. Various characterization techniques including DEMS, Raman, titration, and HRTEM are used to characterize the LiO2 discharge product and the evolution of the Ir nanoparticles. Density functional calculations are used to provide insight into the mechanism for formation of the core–shell Ir3Li particles. The in situ formed Ir3Li core–shell nanoparticles discovered here provide a new direction for active cathode materials that can reduce charge overpotentials in Li–O2 batteries.

Název v anglickém jazyce

In Situ Formed Ir3Li Nanoparticles as Active Cathode Material in Li–Oxygen Batteries

Popis výsledku anglicky

Lithium–oxygen (Li–O2) batteries are a promising class of rechargeable Li batteries with a potentially very high achievable energy density. One of the major challenges for Li–O2 batteries is the high charge overpotential, which results in a low energy efficiency. In this work size-selected subnanometer Ir clusters are used to investigate cathode materials that can help control lithium superoxide formation during discharge, which has good electronic conductivity needed for low charge potentials. It is found that Ir particles can lead to lithium superoxide formation as the discharge product with Ir particle sizes of ∼1.5 nm giving the lowest charge potentials. During discharge these 1.5 nm Ir nanoparticles surprisingly evolve to larger ones while incorporating Li to form core–shell structures with Ir3Li shells, which probably act as templates for growth of lithium superoxide during discharge. Various characterization techniques including DEMS, Raman, titration, and HRTEM are used to characterize the LiO2 discharge product and the evolution of the Ir nanoparticles. Density functional calculations are used to provide insight into the mechanism for formation of the core–shell Ir3Li particles. The in situ formed Ir3Li core–shell nanoparticles discovered here provide a new direction for active cathode materials that can reduce charge overpotentials in Li–O2 batteries.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Physical Chemistry A

ISSN

1089-5639

e-ISSN

—

Svazek periodika

123

Číslo periodika v rámci svazku

46

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

10047-10056

Kód UT WoS článku

000499738900016

EID výsledku v databázi Scopus

2-s2.0-85075172371