Abstract
Rechargeable lithium sulfur cell has become the next-generation energy storage system owing to its theoretical capacity of 1673 mAh/g is 5 times higher than current state of layer-like lithium ion cell based on intercalation mechanism. The discharge/charge of electrode is formed with cleavage/formation, therefore its quantity of reactive lithium ions are not constrained by the structural stability.The present work attempts to study the characteristics of liquid-based lithium sulfur cell with lithium co-salt of LiNO3. At the first part, the study examines how the cut-off voltage region and addition of electrolyte volume (E/S ratio) affect the earlier stage of discharge capacity and middle/later stage of cycle retention. At the second part, water soluble Li3PO4 of ionic conductor is introduced to the lithium sulfur system. The study compares the electrochemical performance by using cycle voltammetry method, AC impedance method, X-ray diffraction and SEM analysis. The results suggest that the addition of 16.7 to 25 % Li3PO4 of conductive agent shows the uniform distribution on the electrode after charge/discharge, therefore they have better rate capability and cycle performance. Such a simple method for the construction of electrode scaffolds shows potential for high C-rate performance lithium sulfur batteries.