Controlling Electrochemical Lithiation/Delithiation Reaction Paths for Long-cycle Life Nanochain-structured FeS2 Electrodes

摘要: Abstract Pyrite (FeS 2 ) stands out from other metal sulfides due to its abundance, low toxicity and high specific energy density. However, the utilization short cycle life of FeS caused by irreversible side reactions dramatic structural changes during charge/discharge process seriously hinders practical application. In this work, we designed nanochains address these issues because unique structure not only shortens ion/electron diffusion distance, increases electrode/electrolyte contact area, but also accommodates strain associated with Li ion intercalation deintercalation reactions. Compared nanoparticles, synthesized magnetic - field assisted aerosol pyrolysis could up 800 cycles at 0.5C, remained a discharge capacity 342.4 mA h g −1 in voltage range 1.0 2.6 V achieved remarkable fading rate 0.02% per cycle, which is among best values demonstrated so far for Li/FeS cells. situ Raman experiments revealed that be suppressed through controlling window, can benefit further improving performance