Hydroxyapatite nanowires composite interlayer based on aramid fiber paper for Li-S batteries

Lithium-sulfur (Li-S) batteries have higher discharge specific capacity and low cost, which is considered to be the most promising lithium-ion battery in the next generation, but the current shuttle effect is still the biggest obstacle to commercial production. In this work, hydroxyapatite (Ca-5(PO4)(3)(OH)) nanowires were prepared by hydrothermal synthesis and formed a hierarchical cross-linked network structure with aramid fiber paper (AP) to hinder the diffusion and dissolution of polysulfides, thereby effectively improving the electrochemical performance of the battery. HN adsorbs polysulfides by using chemical bonds such as hydroxyl groups and inhibits their diffusion to lithium negative electrodes; AP with 3D porous structure not only allows HN to adhere well to the surface, but also captures soluble polysulfides. The electrochemical test results showed that the primary discharge capacity of electrode with HNAP interlayer reached 1456 mAh/g at a rate of 0.05C. The remarkable cycling stability was obtained, the high reversible capacity of 840 mAh/g with negligible fading rate of 0.0243% per cycle at 1C were obtained after 200 cycles. (C) 2019 Elsevier B.V. All rights reserved.