Influence of Electrolyte Li+ Ion Concentration on the Growth of Li2O2 Discharge Products
In this work, it is investigated the influence of electrolyte Li+ ion concentrations on discharge behavior. As shown in Fig.1, the discharge behaviour could be divided into 3 regions as electrolyte concentration increases from 10-3 M to 5 M. The first region is ranged from 10-3 to 1 M, where discharge capacities are monotonic augmenting. It only delivers 2211 mAh gcarbon-1 at 10-3 M, and quickly ramps to 3013, 6055, and 7529 mAh gcarbon-1 at 10-2, 10-1 and 1 M separately. At 2 and 3 M, the discharge capacity hovers at an extremely high level, 12250 and 13245 mAh gcarbon-1 respectively. As the concentration further increases to 4 M and 5 M, the discharge capacity slumps severely to less than 4000 mAh gcarbon-1. The capacity variation is up to ~600% as a result of the tailoring effect of Li+ ion concentration in the electrolytes. The probable mechanism and further discussion will be presented in the conference.
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