制备具有氧空位的钙钛矿结构的Ba0.97Ca0.03Sn0.08Ti0.92O3-δ(BCST)材料并将其作为多硫化物的固定剂,通过强的化学键合作用抑制多硫化物(LiPS)穿梭.作为促进LiPS转化的催化剂,BCST/KB/S(KB为科琴黑)正极在0.1C下提供了1 164.3 mAh·g-1的初始放电容量,以及优异的循环稳定性.经过800次的充放电循环后,平均每次循环的容量衰减率仅为0.052%.
We prepared perovskite Ba0.97Ca0.03Sn0.08Ti0.92O3-δ(BCST)with oxygen vacancies as polysulfide(LiPS)immobilizer in Li-S batteries through strong bonding interactions.As a catalyst for promoting LiPS conversion,Ba0.97Ca0.03Sn0.08Ti0.92O3-δ/Ketjen black/sulfur(BCST/KB/S)cathode delivered a high initial specific discharge capaci-ty of 1 164.3 mAh·g-1 and exceptional cycling stability with a low-capacity decay of only 0.052%per cycle over 800 cycles.