电解质
锂(药物)
枝晶(数学)
离子电导率
阳极
碘化锂
快离子导体
材料科学
电化学
无机化学
电导率
离子键合
化学工程
化学
离子
物理化学
电极
有机化学
工程类
内分泌学
医学
数学
几何学
作者
Masakuni Takahashi,Toshiki Watanabe,Kentaro Yamamoto,Koji Ohara,Atsushi Sakuda,T. Kimura,Seung Dae Yang,Koji Nakanishi,Takeshi Uchiyama,Masao Kimura,Atsushi Sakuda,Masahiro Tatsumisago,Yoshiharu Uchimoto
标识
DOI:10.1021/acs.chemmater.1c00270
摘要
All-solid-state lithium batteries that use lithium metal as the anode have extremely high energy densities. However, for lithium metal anodes to be used, lithium dendrite formation must be addressed. Recently, the addition of lithium iodide (LiI) to sulfide solid electrolytes was found to suppress lithium dendrite formation. It is unclear whether the cause of this suppression is the improvement of the ionic conductivity of the solid electrolyte itself or the electrochemical properties of the lithium metal/solid electrolyte interface. In this study, the cause of the suppression was quantitatively elucidated. The effect of the interphase on the dendrite growth of doping LiI into Li3PS4 was determined using X-ray absorption spectroscopy and X-ray computed tomography measurements. The results revealed that LiI-doped Li3PS4 suppressed the dendrite formation by maintaining the interface due to inhibition of the reductive decomposition of Li3PS4. In addition, annealed LiI-doped Li3PS4 showed a greater dendrite suppression ability as the ionic conductivity increased. From these results, we not only found that the physical properties of the lithium metal/solid electrolyte interface and the bulk ionic conductivity contribute to lithium dendrite suppression but also quantitatively determined the proportions of the contributions of these two factors.
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