The electrochemical characteristics of sulfur composite cathode

The electrochemical characteristics of the sulfur composite cathode for reversible lithium storage were investigated based on different charge/discharge manner. The sulfur composites showed novel electrochemical characteristics as well as the high specific capacity and the good cycleability. The investigation showed that the deep discharge down to less than 1.0 V benefited the performance of the sulfur composite cathode, and the overcharge up to 4.0 V deteriorated its performance. The compaction of the sulfur composite electrode was also investigated. The electrochemical performance of the sulfur composite electrodes was tested at the compaction strength from 0 to 24 MPa, showing that the sulfur composites electrode presented the best electrochemical characteristics at the certain compaction strength of 8 MPa. Its performance seriously deteriorated at the compaction strength of 24 MPa. The study reveals that the appropriate compaction strength benefits the electrochemical performance of the sulfur composite electrode.