Electrochemical behaviour of a graphite electrode in propylene carbonate and 1,3-benzodioxol-2-one based electrolyte system

The electrochemical behaviour of a graphite electrode in a 1 M LiPF6-propylene carbonate (PC)/diethyl carbonate (DEC) (1:1 in volume) electrolyte system and in the same electrolyte system with the addition of 1,3-benzodioxol-2-one (C6H4CO3) is investigated. The decomposition of PC molecules on the graphite during the first lithium intercalation is significantly reduced by the addition of 1,3-benzodioxol-2-one. A mechanism is proposed for the suppression of PC decomposition. The 1,3-benzodioxol-2-one is stable against a LiCoO2 electrode up to 4.3 V (vs. Li+/Li). (C) 1998 Elsevier Science S.A. All rights reserved.