Nonylbenzo-hexaquinone (NBHQ), a quinonoid polymer of low molecular weight, has been reinvestigated as a cathode material for Li cells. Its reduction mechanism gives rise at first, in a 3-electron process, to an irreversible species involving the formation of radical anion. Successively, a direct two-electron reduction of other quinone groups occurs. This second step, witch involve 4 e- in quasi-thermodynamic conditions, is reversible and allows cells of the type Li/LiClO4-PC.DME/NBHQ,C to be cycled for more than 500 cycles at the c/2 rate between 3.5 and 2.0 V. The average energy density during this cycling was 160 Wh/kg, based on the weight of the cathode material (additive included).
Redox mechanism and cycling behaviour of nonylbenzo-hexaquinone electrodes in Li cells / Pasquali, Mauro; G., Pistoia; T., Boschi; P., Tagliatesta. - In: SOLID STATE IONICS. - ISSN 0167-2738. - STAMPA. - 23:(1987), pp. 261-266. [10.1016/0167-2738(87)90003-8]
Redox mechanism and cycling behaviour of nonylbenzo-hexaquinone electrodes in Li cells
PASQUALI, Mauro;
1987
Abstract
Nonylbenzo-hexaquinone (NBHQ), a quinonoid polymer of low molecular weight, has been reinvestigated as a cathode material for Li cells. Its reduction mechanism gives rise at first, in a 3-electron process, to an irreversible species involving the formation of radical anion. Successively, a direct two-electron reduction of other quinone groups occurs. This second step, witch involve 4 e- in quasi-thermodynamic conditions, is reversible and allows cells of the type Li/LiClO4-PC.DME/NBHQ,C to be cycled for more than 500 cycles at the c/2 rate between 3.5 and 2.0 V. The average energy density during this cycling was 160 Wh/kg, based on the weight of the cathode material (additive included).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
