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Electrochemical lithium insertion into layered MnO 2 forms containing bismuth is reported. A low temperature technique based on a slow coprecipitation in acidic medium in the presence of KMnO 4 and a bismuth (III) salt is applied, leading to amorphous MnO 2 forms. A chronopotentiometric study has shown that the lithium insertion process occurs in one step located at 3 V and...