Covalently Interlinked Graphene Sheets with Sulfur-Chains Enable Superior Lithium-Sulfur Battery Cathodes at Full-Mass Level

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27640%2F21%3A10247710" target="_blank" >RIV/61989100:27640/21:10247710 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989592:15640/21:73607160

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1002/adfm.202101326" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/adfm.202101326</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/adfm.202101326" target="_blank" >10.1002/adfm.202101326</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Covalently Interlinked Graphene Sheets with Sulfur-Chains Enable Superior Lithium-Sulfur Battery Cathodes at Full-Mass Level

Popis výsledku v původním jazyce

Sulfur represents a low-cost, sustainable, and high theoretical capacity cathode material for lithium-sulfur batteries, which can meet the growing demand in portable power sources, such as in electric vehicles and mobile information technologies. However, the shuttling effect of the formed lithium polysulfides, as well as their low conductivity, compromise the electrochemical performance of lithium-sulfur cells. To tackle this challenge, a so far unexplored cathode, composed of sulfur covalently bonded directly on graphene is developed. This is achieved by leveraging the nucleophilicity of polysulfide chains, which react readily with the electrophilic centers in fluorographene, as experimental and theoretical data unveil. The reaction leads to the formation of carbon-sulfur covalent bonds and a particularly high sulfur content of 80 mass%. Owing to these features, the developed cathode exhibits excellent performance with only 5 mass% of conductive carbon additive, delivering very high full-cathode-mass capacities and rate capability, combined with superior cycling stability. In combination with a fluorinated ether as electrolyte additive, the capacity persists at ALMOST EQUAL TO700 mAh gMINUS SIGN 1 after 100 cycles at 0.1 C, and at ALMOST EQUAL TO644 mAh gMINUS SIGN 1 after 250 cycles at 0.2 C, keeping ALMOST EQUAL TO470 mAh gMINUS SIGN 1 even after 500 cycles. (C) 2021 Wiley-VCH GmbH

Název v anglickém jazyce

Covalently Interlinked Graphene Sheets with Sulfur-Chains Enable Superior Lithium-Sulfur Battery Cathodes at Full-Mass Level

Popis výsledku anglicky

Sulfur represents a low-cost, sustainable, and high theoretical capacity cathode material for lithium-sulfur batteries, which can meet the growing demand in portable power sources, such as in electric vehicles and mobile information technologies. However, the shuttling effect of the formed lithium polysulfides, as well as their low conductivity, compromise the electrochemical performance of lithium-sulfur cells. To tackle this challenge, a so far unexplored cathode, composed of sulfur covalently bonded directly on graphene is developed. This is achieved by leveraging the nucleophilicity of polysulfide chains, which react readily with the electrophilic centers in fluorographene, as experimental and theoretical data unveil. The reaction leads to the formation of carbon-sulfur covalent bonds and a particularly high sulfur content of 80 mass%. Owing to these features, the developed cathode exhibits excellent performance with only 5 mass% of conductive carbon additive, delivering very high full-cathode-mass capacities and rate capability, combined with superior cycling stability. In combination with a fluorinated ether as electrolyte additive, the capacity persists at ALMOST EQUAL TO700 mAh gMINUS SIGN 1 after 100 cycles at 0.1 C, and at ALMOST EQUAL TO644 mAh gMINUS SIGN 1 after 250 cycles at 0.2 C, keeping ALMOST EQUAL TO470 mAh gMINUS SIGN 1 even after 500 cycles. (C) 2021 Wiley-VCH GmbH

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Advanced Functional Materials

ISSN

1616-301X

e-ISSN

—

Svazek periodika

31

Číslo periodika v rámci svazku

30

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

10

Strana od-do

2101326

Kód UT WoS článku

000640561600001

EID výsledku v databázi Scopus

2-s2.0-85104356693