OLCHOWKA, Jacob; INVERNIZZI, Ronan; LEMOINE, Alexia; ALLOUCHE, Joachim; BARAILLE, Isabelle; FLAHAUT, Delphine; GUERLOU-DEMOURGUES, Liliane

doi:10.1149/1945-7111/ab9a03

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OLCHOWKA, Jacob
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

INVERNIZZI, Ronan
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

LEMOINE, Alexia
Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]

Langue

Article de revue

Ce document a été publié dans

Journal of The Electrochemical Society. 2020-10-06, vol. 167, n° 10, p. 100527 (7 p.)

Electrochemical Society

Résumé en anglais

Nano-oxides and hydroxides generate great interest as promising positive electrode materials for the development of high energy density supercapacitors. However, their usually limited ionic and electronic conductivities significantly decrease their energy storage performances when increasing the electrode's mass loading. Here, we report on a sonochemical approach to functionalize the surface of Co(OH)2 nanomaterials by EmimBF4 ionic liquid that greatly improves the stability and the electrochemical performances of high mass loading electrodes (13 mg cm−2). This surface functionalization boosts the transport properties and strongly enhances the capacity as well as the capacity retention at higher current densities compared to basic Co(OH)2 (e.g. 113.5 C g−1 vs 59.2 C g−1 at 1 A g−1). Additionally, the protective layer formed by the ionic liquid stabilizes the electrode material upon cycling in KOH aqueous electrolyte and protects the material from oxidation upon open-air storage.< Réduire

Mots clés en anglais

Supercapacitors

Electrochemical energy storage

Surface modification

Cobalt hydroxide

Ionic Liquids

DOI

http://dx.doi.org/10.1149/1945-7111/ab9a03

Project ANR

Laboratory of excellency for electrochemical energy storage - ANR-10-LABX-0076

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026