Unfortunate oversights on our part affected the values of electrical conductivity obtained from simulations as reported in the Letter.(1) These are (i) n in (eq S1)(1) should be taken as the number of ion pairs of the salt (LiBF4) in the solution and not as the total number of ions (ii) the value of the elementary charge e used in eq S1(1) and in eq S2(1) was incorrect (1.69 × 10–19 C) which has been

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The v/v1/2 scan rate diagnosis in electrochemical energy storage devices is based on application of the relationship i = k1v + k2v1/2 (where k1 and k2 are two constants independent of the scan rate v) to the variation of the cyclic voltammetric responses with v. Several examples show that application of this scan rate diagnosis procedure leads to absurd results because the procedure is inappropriate