Abstract
The effects of testing temperature on the electrochemical properties of Li(Ni0.6Mn0.2Co0.2)O2 are investigated in detail. When the testing temperature is 40 °C, the Li(Ni0.6Mn0.2Co0.2)O2 cathode material possesses the highest initial discharge capacity of 162.4 mAh·g−1 at 0.5C rate, but their cycling stability decreases markedly. When the test temperature rises up to 60 °C, the side reaction between electrolyte and cathode material becomes serious, and the Li(Ni0.6Mn0.2Co0.2)O2 cannot work. When the testing temperature decreases, the electrochemical impedances like Rct values increase, and then the discharge capacity at 0 °C, −10 °C and −20 °C is only 80%, 53% and 23% of that at 25 °C. Based on the electrochemical impedance spectra at different temperatures, four kinds of equivalent circuit models are classified. The cycle and rate performance of Li(Ni0.6Mn0.2Co0.2)O2 cathode material could be improved obviously through Ti3C2(OH)2 modification in an extreme environment, and especially in sub-zero environment.
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