Electrochemical lithium extraction and insertion in LiFe1-xMnxPO4 has been investigated by high throughput cyclic voltammetry on an array of samples with different degrees of carbon coating to assist electron transfer. A linear decrease in the capacity was observed with an increase in the value of x and was explained by a gradual loss of electronic conductivity due to the manganese substituent. Slow scan voltammograms show differences in peak shapes corresponding to a heterogeneous (two-phase) reaction in LiFePO4 and a homogeneous (one-phase) reaction of iron in LiFe0.2Mn0.8PO4, illustrating a general interpretation of voltammograms to differentiate these mechanisms. <br/
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