Li_(2)ZnTi_(3)O_(8)as the host–separator modifier with efficient polysulfides trapping and fast Li^(+)diffusion for lithium-sulfur batteries  

作　　者：Mao Qian Yakun Tang Lang Liu Yue Zhang Xiaohui Li JiaJia Chen 

机构地区：[1]State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources,Xinjiang University,Urumqi 830017,China [2]State Key Laboratory of Physical Chemistry of Solid Surfaces,Xiamen University,Xiamen 361005,China

出　　处：《Nano Research》2024年第7期6087-6094,共8页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.22278347);State Key Laboratory of Physical Chemistry of Solid Surface(No.2021X21);State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources.

摘　　要：The diffusion and loss of lithium polysulfides(LiPSs)in lithium-sulfur batteries(LSBs)reduce the sulfur utilization rate and the catalytic conversion efficiency of sulfur species,resulting in early battery failure.Li_(2)ZnTi_(3)O_(8)(LZTO),characterized by its stable spinel structure,exhibits high Li+conductivity and holds great potential as an effective adsorbent for LiPSs.This study proposes a collaborative design concept of LZTO host–separator modifier,which offers a complementary and matching approach in the cathode side,effectively addressing the challenges associated with dissolution and inadequate conversion of LiPSs.Density functional theory(DFT)calculation substantiates the pronounced chemical affinity of LZTO towards LiPSs.More importantly,the high efficiency ion transport channels are achieved in separator coating due to the presence of the LZTO particles.Furthermore,the catalytic efficacy of LZTO is validated through meticulous analysis of symmetric batteries and Tafel curves.Consequently,the LZTO host–separator modifier-based cell displays satisfactory rate capability(1449 and 1166 mAh·g^(−1)at 0.1 and 0.5 C)and an impressively capacity(606 mAh·g^(−1)after 500 cycles at 1 C).The coordinated strategy of host–separator modifier is supposed to have wide applications in LSBs.

关 键 词：Li_(2)ZnTi_(3)O_(8) lithium-sulfur batteries host-separator modifier catalytic conversion diffusion and loss of LiPSs 

分 类 号：TM912[电气工程—电力电子与电力传动]