Application Of Tin Sulfide Anode Materials In Lithium Ion Batteries

The SnS₂ materials were studied in this paper in order to obtain the high specific capacity and high cycling stability anodes for lithium-ion batteries.The first part of the research is to prepare the SnS2@GO nanocomposites coated with trace amounts of graphene by using the solvent thermal method,and then to fabricate the anode by using the slurry technology.Tested results for this anode material illustrate that the graphene can improve the electrical conductivity and speed up the rate of electron transportation in these composite materials.It can also act as a structural skeleton to buffer the volume expansion of the active material during the reaction process,thus the stability of electrode structure can be improved,with the electrochemical performance of the composites proved to be better than pure SnS2.The reversible capacity is maintained upto 668 mAh g-1 when it is restored to the initial 0.1 A g-1 after cycling at different high current density.Though the capacity of the pure SnS2 electrode decreased constantly at 0.5 A g-1,the reversible capacity of the SnS2@GO electrode is still stable at 520 mAh g-1 after 200 cycles,demonstating a higher electrode structure stability.The second part of the research is about the binder-free SnS2-MS anode fabricated by using the magnetron sputtering technology.The utilization ratio of the SnS2 active material can be greatly increased.The SnS2-MS electrodes show superior reversibility of conversion reaction due to the shorter ions/electrons transport path and closer contact between the active substance and the electrolyte,suggesting that the stable electrode structure is achieved.Its capacity retention rate is above 80%after 200 cycles at 0.5 A g-1,and the high rate capability of 788 mAh g-1 is achieved at 5.0 A g-1.Furthermore,the fabricated SnS2 nanoparticles illustrate the dominant pseudocapacitive effect,guaranteeing its high-rate performance with 967 mAh g-1 at 1.0 A g-1.These excellent cycling stability and high rate capability demonstrate its potential prospect as a high performfance anode material for lithium-ion battery.