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Titolo:
ROLE OF DISSOLUTION OF MN(III) SPECIES IN DISCHARGE AND RECHARGE OF CHEMICALLY-MODIFIED MNO2 BATTERY CATHODE MATERIALS
Autore:
QU DY; CONWAY BE; BAI L; ZHOU YH; ADAMS WA;
Indirizzi:
UNIV OTTAWA,DEPT CHEM OTTAWA K1N 6N5 ONTARIO CANADA UNIV OTTAWA,CTR ELECTROCHEM SCI & TECHNOL OTTAWA K1N 6N5 ONTARIO CANADA
Titolo Testata:
Journal of Applied Electrochemistry
fascicolo: 7, volume: 23, anno: 1993,
pagine: 693 - 706
SICI:
0021-891X(1993)23:7<693:RODOMS>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRODES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
D.Y. Qu et al., "ROLE OF DISSOLUTION OF MN(III) SPECIES IN DISCHARGE AND RECHARGE OF CHEMICALLY-MODIFIED MNO2 BATTERY CATHODE MATERIALS", Journal of Applied Electrochemistry, 23(7), 1993, pp. 693-706

Abstract

Various experimental techniques, including cyclic-voltammetry, constant current discharge and recharge, with a detecting electrode for determination of soluble Mn(III) intermediate species, were used to study the reaction mechanism involved in the reduction of a chemical modified form of MnO2 that is multiply rechargeable. The results show how dissolution of Mn(III) species plays an important role in the overall path of the reduction reaction and also in the rechargeability of the material. Mainly an heterogeneous reduction mechanism is involved; substantial loss of capacity can arise if diffusion of the soluble Mn(III) species into the bulk electrolyte solution is allowed to take place. Inpractical cells, this effect must be minimized using cells with 'starved electrolyte', i.e. with only a small free volume-fraction of KOH electrolyte in the MnO2-carbon electrode structure. Soluble Mn(III) species were detected in in situ experiments by means of (a) a spectro-electrochemical procedure, (b) a 'collector' electrode system at which dissolved Mn(III) was reoxidized to MnO2, and (c) a rotating ring-disc electrode.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 12:00:23