Enhanced performance of Si-based Li-ion batteries through elastic cushioning with hollow graphene shells

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F22%3A10251031" target="_blank" >RIV/61989100:27710/22:10251031 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.webofscience.com/wos/woscc/full-record/WOS:000798084500001" target="_blank" >https://www.webofscience.com/wos/woscc/full-record/WOS:000798084500001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s40843-021-2031-8" target="_blank" >10.1007/s40843-021-2031-8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Enhanced performance of Si-based Li-ion batteries through elastic cushioning with hollow graphene shells

Popis výsledku v původním jazyce

Silicon (Si) is a promising anode material for next-generation Li-ion batteries. The nanometer-sized Si could alleviate the pulverization caused by large volume changes during deep cycling. However, compression between agglomerated Si particles causes Si cracking and electrode failure. Considering this, we engineered a mechanical cushioning space between Si particles via elastic hollow graphene shells (GSs) to flexibly buffer volume changes and maintain the stability of the electrode structure. The stress generated from the Si volume expansion during lithiation was mechanically buffered and gently released by compression of the hollow space of the GS. In this Si/GS composite electrode, GS also reduced the local agglomeration of Si particles and effectively improved the overall conductivity. Considering these advantages, the designed Si/GS electrode showed an enhanced cycling performance with more than 1200 mA h g(-1) at 0.8 A g(-1) and an excellent rate capability of 1025 mA h g(-1) at 4 A g(-1) after 200 cycles.

Název v anglickém jazyce

Enhanced performance of Si-based Li-ion batteries through elastic cushioning with hollow graphene shells

Popis výsledku anglicky

Silicon (Si) is a promising anode material for next-generation Li-ion batteries. The nanometer-sized Si could alleviate the pulverization caused by large volume changes during deep cycling. However, compression between agglomerated Si particles causes Si cracking and electrode failure. Considering this, we engineered a mechanical cushioning space between Si particles via elastic hollow graphene shells (GSs) to flexibly buffer volume changes and maintain the stability of the electrode structure. The stress generated from the Si volume expansion during lithiation was mechanically buffered and gently released by compression of the hollow space of the GS. In this Si/GS composite electrode, GS also reduced the local agglomeration of Si particles and effectively improved the overall conductivity. Considering these advantages, the designed Si/GS electrode showed an enhanced cycling performance with more than 1200 mA h g(-1) at 0.8 A g(-1) and an excellent rate capability of 1025 mA h g(-1) at 4 A g(-1) after 200 cycles.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20400 - Chemical engineering

Projekt

<a href="/cs/project/EF16_019%2F0000853" target="_blank" >EF16_019/0000853: Institut environmentálních technologií - excelentní výzkum</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Science China-Materials

ISSN

2095-8226

e-ISSN

2199-4501

Svazek periodika

Neuveden

Číslo periodika v rámci svazku

September 2022

Stát vydavatele periodika

CN - Čínská lidová republika

Počet stran výsledku

11

Strana od-do

nestrankovano

Kód UT WoS článku

000798084500001

EID výsledku v databázi Scopus

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