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In this work, we have fabricated a novel hybrid electrochemical energy storage device with composite cathode containing LiNi0.5Co0.2Mn0.3O2 and activated carbon (AC), and graphite anode. The specific energy increases with the content of LiNi0.5Co0.2Mn0.3O2 in composite cathode. The hybrid device possesses a specific energy 5.7 times higher than that of the electrical double layer capacitor. Meanwhile,...
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