Precisely visit the performance modulation of functionalized separator in Li-S batteries via consecutive multiscale analysis
Precisely visit the performance modulation of functionalized separator in Li-S batteries via consecutive multiscale analysis
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通过连续多尺度分析精确考察锂硫电池功能化隔膜的性能调节
DOI：
10.1016/j.ensm.2022.04.003
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发表时间：
2022
影响因子：
20.4
通讯作者：
Hao Z
中科院分区：
文献类型：
--
作者：
Hao Z
尽管功能化隔膜在防止穿梭效应和提高硫利用率方面取得了进展，但迄今为止，对Li-S电池结构-功能-性能相关性的精确和非破坏性研究仍然有限。在这里，我们建立连续的多尺度分析通过结合X射线吸收精细结构（XAFS）和X射线计算断层扫描（CT）技术，精确访问的结构-功能-性能的关系。XAFS测量提供了化学结构和环境的原子尺度变化。此外，X射线CT的非破坏性技术证明了功能化分离器在微观尺度上的作用，这是将材料的化学结构与细胞的整体性能调节联系起来的强大链接。受益于这种连续的多尺度分析，我们报告说，Sr 2+均匀掺杂到钙钛矿LaMnO 3-δ材料中改变了Mn的氧化态和导电性（化学结构），导致有效的多硫化锂捕获和加速的硫氧化还原（隔板功能），并导致出色的电池性能。
Despite progress of functionalized separator in preventing the shuttle effect and promoting the sulfur utilization, the precise and non-destructive investigation of structure-function-performance associativity remains limited so far in Li-S batteries. Here, we build consecutive multiscale analysisviacombining X-ray absorption fine structure (XAFS) and X-ray computational tomography (CT) techniques to precisely visit the structure-function-performance relationship. XAFS measurement offers the atomic scale changes in the chemical structure and environment. Moreover, a non-destructive technique of X-ray CT proves the functionalized separator role for microscopic scale, which is powerful chaining to bridge the chemical structures of the materials with the overall performance modulation of cells. Benefiting from this consecutive multiscale analysis, we report that the uniform doping of Sr2+into the perovskite LaMnO3-δmaterial changes the Mn oxidation states and conductivity (chemical structure), leading to effective lithium polysulfide trapping and accelerated sulfur redox (separator function), and resulting in outstanding cell performance.