Unexpected intercalation-dominated potassium storage in WS2 as a potassium-ion battery anode

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F19%3A00511497" target="_blank" >RIV/61388963:_____/19:00511497 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/19:10403771

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs12274-019-2543-0" target="_blank" >https://link.springer.com/article/10.1007%2Fs12274-019-2543-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s12274-019-2543-0" target="_blank" >10.1007/s12274-019-2543-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Unexpected intercalation-dominated potassium storage in WS2 as a potassium-ion battery anode

Popis výsledku v původním jazyce

Unexpected intercalation-dominated process is observed during K+ insertion in WS2 in a voltage range of 0.01-3.0 V. This is different from the previously reported two-dimensional (2D) transition metal dichalcogenides that undergo a conversion reaction in a low voltage range when used as anodes in potassium-ion batteries. Charge/discharge processes in the K and Na cells are studied in parallel to demonstrate the different ion storage mechanisms. The Na+ storage proceeds through intercalation and conversion reactions while the K+ storage is governed by an intercalation reaction. Owing to the reversible K+ intercalation in the van der Waals gaps, the WS2 anode exhibits a low decay rate of 0.07% per cycle, delivering a capacity of 103 mAh center dot g(-1) after 100 cycles at 100 mA center dot g-(1). It maintains 57% capacity at 800 mA center dot g(-1) and shows stable cyclability up to 400 cycles at 500 mA center dot g-(1). Kinetics study proves the facilitation of K+ transport is derived from the intercalation-dominated mechanism. Furthermore, the mechanism is verified by the density functional theory (DFT) calculations, showing that the progressive expansion of the interlayer space can account for the observed results.

Název v anglickém jazyce

Unexpected intercalation-dominated potassium storage in WS2 as a potassium-ion battery anode

Popis výsledku anglicky

Unexpected intercalation-dominated process is observed during K+ insertion in WS2 in a voltage range of 0.01-3.0 V. This is different from the previously reported two-dimensional (2D) transition metal dichalcogenides that undergo a conversion reaction in a low voltage range when used as anodes in potassium-ion batteries. Charge/discharge processes in the K and Na cells are studied in parallel to demonstrate the different ion storage mechanisms. The Na+ storage proceeds through intercalation and conversion reactions while the K+ storage is governed by an intercalation reaction. Owing to the reversible K+ intercalation in the van der Waals gaps, the WS2 anode exhibits a low decay rate of 0.07% per cycle, delivering a capacity of 103 mAh center dot g(-1) after 100 cycles at 100 mA center dot g-(1). It maintains 57% capacity at 800 mA center dot g(-1) and shows stable cyclability up to 400 cycles at 500 mA center dot g-(1). Kinetics study proves the facilitation of K+ transport is derived from the intercalation-dominated mechanism. Furthermore, the mechanism is verified by the density functional theory (DFT) calculations, showing that the progressive expansion of the interlayer space can account for the observed results.

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

Nano Research

ISSN

1998-0124

e-ISSN

—

Svazek periodika

12

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

CN - Čínská lidová republika

Počet stran výsledku

6

Strana od-do

2997-3002

Kód UT WoS článku

000494220000001

EID výsledku v databázi Scopus

2-s2.0-85074842422