Carbon coating on Nb20s for high-rate anode for Li-ion capacitors

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F21%3A63546238" target="_blank" >RIV/70883521:28610/21:63546238 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Carbon coating on Nb20s for high-rate anode for Li-ion capacitors

Popis výsledku v původním jazyce

Fast charging/discharging capability is one of the key parameters for next-generation energy storage devices. Li-ion capacitors have been proposed as an altemative approach to overcome the low energy density of conventional electrochemical double layer capacitors (EDLCs). A higher energy density could be achieved by replacing ·one activated carbon electrode with a Li-ion insertion/deinsertion electrode, which has a much higher specific capacity. The selection of this type of electrodes for Li-ion capacitors is the key to achieve desired performances. Nb2Os are one ofthe promising high-power anode materials. The Nb2Os based Li-ion capacitors working in the safe voltage range are :free of the potential safety problems associated with the electrolyte decomposition, which can result in stable cycle life. However, further progress ofNb2Os anodes for practical applications faces challenges due to their intrinsic poor electric conductivity (~3x10-6 S cm-1). In this study, polyaniline (PANI) was coated on Nb2Os particles. After the carbonization, Nb2O5/Carbon composites were obtained with different carbon contents. They were investigated through various tools such as electron microscopes and X-ray dif:fraction. Their electrochemical performance was tested in coin cell 2032 with the lithium anode. As a result, the application of carbon enhances the rate capability ofthe cell. However, the optimization of carbon content was necessary.

Název v anglickém jazyce

Carbon coating on Nb20s for high-rate anode for Li-ion capacitors

Popis výsledku anglicky

Fast charging/discharging capability is one of the key parameters for next-generation energy storage devices. Li-ion capacitors have been proposed as an altemative approach to overcome the low energy density of conventional electrochemical double layer capacitors (EDLCs). A higher energy density could be achieved by replacing ·one activated carbon electrode with a Li-ion insertion/deinsertion electrode, which has a much higher specific capacity. The selection of this type of electrodes for Li-ion capacitors is the key to achieve desired performances. Nb2Os are one ofthe promising high-power anode materials. The Nb2Os based Li-ion capacitors working in the safe voltage range are :free of the potential safety problems associated with the electrolyte decomposition, which can result in stable cycle life. However, further progress ofNb2Os anodes for practical applications faces challenges due to their intrinsic poor electric conductivity (~3x10-6 S cm-1). In this study, polyaniline (PANI) was coated on Nb2Os particles. After the carbonization, Nb2O5/Carbon composites were obtained with different carbon contents. They were investigated through various tools such as electron microscopes and X-ray dif:fraction. Their electrochemical performance was tested in coin cell 2032 with the lithium anode. As a result, the application of carbon enhances the rate capability ofthe cell. However, the optimization of carbon content was necessary.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Projekt

<a href="/cs/project/LTT20005" target="_blank" >LTT20005: Spolupráce s asociací EASE na vývoji hybridního superkapacitoru</a><br>

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