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High capacity and high energy cathodes prepared from Li-rich 0.35Li2MnO3·0.65Li[Mn0.45Ni0.35Co0.20]O2 materials must be activated in Li-ion cells prior to normal cycling, in order to achieve their high discharge capacity of >250 mA h g−1. Activation is performed by charging the electrodes to potentials of 4.7–4.8 V vs. Li/Li+. This communication reports on the discovery that electrochemical activation of these cathode materials at low temperatures (0–15 °C) increases their discharge capacity, lowers average charge voltage, and diminishes voltage hysteresis. Work with the above mentioned material is reported as a representative example.

rsc advances

Enhanced capacity and lower mean charge voltage of Li-rich cathodes for lithium ion batteries resulting from low-temperature electrochemical activation