Figure : The distribution of electrolyte potential along the thickness direction within the Li-S battery under increasing discharging rates: 0.2C, 0.5C, 1C, 2C, 4C, 6C under increasing discharging rates. Meanwhile, the concnentration difference is much higher within the surfur cathode than the liquid electrolyte. This is due to the much higher Li + diffusion capability within liquid electrolyte than that of surfur cathode and it is consistent with what we found in Figure and 4. As we just mentioned, due to the inhomogeneous electrochemical reactions, the surfur cathode exhibits large inhomogeneity of Li + : regions closer to the alumina current collector exhibit relatively smaller gradient of Li + , and regions far away from the alumina current collector exhibit relatively higher gradient of Li + . This is due to the fact that for regions of surfur cathode, it participarte the electrochemical reactions much less than regions that are closer to the liquid electrolyte.