1999
DOI: 10.1016/s0013-4686(99)00208-x
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An overview of the Li(Ni,M)O2 systems: syntheses, structures and properties

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Cited by 310 publications
(248 citation statements)
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“…In a last step, for the most deintercalated phases, there is no more evolution of the various iron populations. In previous works on the Li V (Ni, Co)O system (22,36), it was shown that nickel ions were oxidized in a "rst step and cobalt ions in the second step due to the di!erence in crystal "eld imposed by the prevailing cations within the slabs (37,38). If one assumes a similar behavior in the Li V (Ni, Co, Fe)O system, comparison of the average cationic charge (deduced from the electrochemical study) to the number of oxidized iron ions (deduced from MoK ssbauer calculation) shows that Ni> and Fe> are simultaneously oxidized during the second step of the charge (0.304x40.90).…”
Section: * the Isomer Shift Ismentioning
confidence: 99%
“…In a last step, for the most deintercalated phases, there is no more evolution of the various iron populations. In previous works on the Li V (Ni, Co)O system (22,36), it was shown that nickel ions were oxidized in a "rst step and cobalt ions in the second step due to the di!erence in crystal "eld imposed by the prevailing cations within the slabs (37,38). If one assumes a similar behavior in the Li V (Ni, Co, Fe)O system, comparison of the average cationic charge (deduced from the electrochemical study) to the number of oxidized iron ions (deduced from MoK ssbauer calculation) shows that Ni> and Fe> are simultaneously oxidized during the second step of the charge (0.304x40.90).…”
Section: * the Isomer Shift Ismentioning
confidence: 99%
“…21 The irreversible capacity losses of all the samples likely resulted from the formation of inactive regions due to the oxidation of Ni 2+ ions occupying Li sites in the Li layer. 22 The sample calcined at 700°C delivered the maximum discharge capacity of all the samples (207 mAhg −1 in the first cycle), whereas the material prepared at 800 °C delivered the lowest discharge capacity (160 mAhg −1 ). The discharge capacities of the samples prepared at 650 and 750 °C were ca.…”
Section: Resultsmentioning
confidence: 91%
“…Entretanto, a síntese estequiométrica desse material é um tanto complexa, e seu comportamento eletroquímico é fortemente dependente da existência de defeitos estruturais formados durante este processo [39][40][41] . Além disso, sob extensiva deintercalação (na qual x se aproxima de zero e o estado de valência do níquel se torna próximo de 4+) os íons níquel migram de seus sítios para as vacâncias deixadas pelos íons lítio.…”
Section: Materiais Catódicos Materiais Inorgânicos: óXidos De Metais unclassified
“…Outro exemplo da classe dos materiais híbridos é o que abrange os cátodos formados entre PCEs e os polioxometalatos como o fósforomolibdato, por exemplo 203 . Nesse sentido, Otero et al 204 discutiram as propriedades do compósito entre polipirrol e PW 12 O 40 3-, apesar dos problemas de dissolução do cátodo com o decorrer dos ciclos de carga/descarga, o material apresentou uma capacidade específica da ordem de 100 A h kg -1 .…”
Section: Compósitos Entre Materiais Orgânicos E Inorgânicosunclassified