Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The role of nanoparticle concentration and CNT coating in high-performance polymer-free micro/nanostructured carbon nanotube-nanoparticle composite electrode for Li intercalation

Texto completo
Autor(es):
Freitas Neto, D. B. [1] ; Xavier, F. F. S. [1] ; Matsubara, E. Y. [1] ; Parmar, R. [1, 2] ; Gunnella, R. [2] ; Rosolen, J. M. [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, Ave Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP - Brazil
[2] Univ Camerino, Phys Div, Via Madonna Dele Carceri 9, I-62032 Camerino, MC - Italy
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 858, FEB 1 2020.
Citações Web of Science: 0
Resumo

We investigate how Li intercalation into composite electrodes resulting from the combination of graphitic carbon felt (CF) with carbon nanotubes (CNTs) functionalized with electroactive nanoparticles (NPs) depends on NP concentration. To this end, we study CF electrodes coated or not with hydrophilic CNTs containing electrodeposited beta/gamma-MnO(2)NPs (wt% 25, 42, and 69) with hollow-nanotube structure. Galvanic coupling between the CNTs and the NPs is the reason why the electrochemical performance of CNT-NP nanocomposites varies with the NP concentration. The CNT coating on the CF electrode also avoids capacity fading of the CF/MnO2NP electrodes and prevents carbon fibers from interconnecting with SEL More specifically, the CNTs stabilize the solid electrolyte interphase and prevent NP detachment, thereby producing electrodes with long-term cyclability. The best electrochemical performance occurs for CNT/MnO2NP mass wt% 25 (1114 mAh g(-1), 1st discharge/charge Faradaic efficiency similar to 80% at 1 A g(-1), cut-off potential = 4-0.005 V vs Li+ /Li). (C) 2020 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 17/04759-2 - Free-binder eletrodos para dispositivos de armazenagem/conversão de energia
Beneficiário:Jose Mauricio Rosolen
Modalidade de apoio: Auxílio à Pesquisa - Regular