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Titolo:
Charge-discharge characteristics and phase transitions of mixed LiNi0.8Co0.2O2 and LiMn2O4 cathode materials for lithium-ion batteries
Autore:
Ma, ZF; Yang, XQ; Sun, X; McBreen, J;
Indirizzi:
Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai 200240, Peoples R China Shanghai Jiao Tong Univ Shanghai Peoples R China 200240 Peoples R China Brookhaven Natl Lab, Upton, NY 11973 USA Brookhaven Natl Lab Upton NY USA11973 aven Natl Lab, Upton, NY 11973 USA
Titolo Testata:
JOURNAL OF NEW MATERIALS FOR ELECTROCHEMICAL SYSTEMS
fascicolo: 2, volume: 4, anno: 2001,
pagine: 121 - 125
SICI:
1480-2422(200104)4:2<121:CCAPTO>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-DIFFRACTION; THERMAL-STABILITY; PERFORMANCE; LI-1-XNIO2;
Keywords:
composite cathode; lithium ion batteries; cycle life; phase transitions;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Ma, ZF Shanghai Jiao Tong Univ, Dept Chem Engn, Shanghai 200240, Peoples RChina Shanghai Jiao Tong Univ Shanghai Peoples R China 200240 s R China
Citazione:
Z.F. Ma et al., "Charge-discharge characteristics and phase transitions of mixed LiNi0.8Co0.2O2 and LiMn2O4 cathode materials for lithium-ion batteries", J NEW M E S, 4(2), 2001, pp. 121-125

Abstract

The charge-discharge characteristics of the composite cathode made of the mixture of LiNi0.8Co0.2O2 and LiMn2O4 was studied in a battery cell using alithium foil as an anode. Three plateaus were observed at 3.85 V, 4.0 V and 4.2 V during charge. The operating voltage of the composite cathode is higher than the single-component cathode LiNi0.8Co0.2O2. Compared to the other single-component LiMn2O4 cathode, a smaller capacity fading was obtained for the composite cathode. The synchrotron based In situ x-ray diffraction (XRD) was used to study the phase transitions of the composite cathode during charge-discharge. In the composite cathode, the phase transitions of each component during charge-discharge can be clearly identified. These phase transitions are basically the same as observed in single-component cathode:the phase transitions from hexagonal I(HI) to hexagonal II (H2), and then to hexagonal III (H3) were observed for the component of LiNi0.8Co0.2O2, and the phase transitions from cubic I(C1) to cubic II (C2), and then to cubic III (C3) were observed for the component of LiMn2O4. However; some interesting new kinetic effects, which ave differentiation the single-component cathode, were observed.

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Documento generato il 27/10/20 alle ore 10:09:19