用于全固态 Li/S 电池的具有纳米级离子传导路径的高容量 Li2S–Li2O–LiI 正极,Small

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用于全固态 Li/S 电池的具有纳米级离子传导路径的高容量 Li2S–Li2O–LiI 正极
Small ( IF 13.0 ) Pub Date : 2023-05-01 , DOI: 10.1002/smll.202302179
Yushi Fujita ₁ , Atsushi Sakuda ₁ , Yuki Hasegawa ₁ , Minako Deguchi ₁ , Kota Motohashi ₁ , Ding Jiong ₂ , Hirofumi Tsukasaki ₂ , Shigeo Mori ₂ , Masahiro Tatsumisago ₁ , Akitoshi Hayashi ₁

Affiliation

全固态锂硫（Li/S）电池由于其高容量和长循环寿命而成为有前途的下一代储能设备。正极采用的Li _{2 S活性物质理论容量高；}因此，由Li ₂ S、固体电解质和导电碳组成的纳米复合材料可用于制造高能量密度电池。此外，活性材料应采用微米级和纳米级离子传导路径来构建，以确保高功率。在此，开发了一种Li ₂ S-Li ₂ O-LiI正极，其中活性材料分散在非晶基质中。Li ₂ S–Li ₂ O–LiI在2 C倍率和25 °C下表现出高充放电容量和998 mAh g ^{-1的高比容量。}X射线光电子能谱、X射线衍射和透射电子显微镜观察表明，Li ₂ O-LiI在循环过程中提供纳米级离子传导路径，从而激活Li ₂ S并提供大容量；它还表现出适当的高容量起始氧化电压。^{此外，具有 10.6 mAh cm –2}高面积容量的电池被证明可以使用 Li ₂ S–Li ₂ O–LiI 正极在 25 °C 下成功运行。这项研究代表了全固态锂/硫电池商业化的重要一步。

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High Capacity Li2S–Li2O–LiI Positive Electrodes with Nanoscale Ion-Conduction Pathways for All-Solid-State Li/S Batteries

All-solid-state lithium–sulfur (Li/S) batteries are promising next-generation energy-storage devices owing to their high capacities and long cycle lives. The Li₂S active material used in the positive electrode has a high theoretical capacity; consequently, nanocomposites composed of Li₂S, solid electrolytes, and conductive carbon can be used to fabricate high-energy-density batteries. Moreover, the active material should be constructed with both micro- and nanoscale ion-conduction pathways to ensure high power. Herein, a Li₂S–Li₂O–LiI positive electrode is developed in which the active material is dispersed in an amorphous matrix. Li₂S–Li₂O–LiI exhibits high charge–discharge capacities and a high specific capacity of 998 mAh g⁻¹ at a 2 C rate and 25 °C. X-ray photoelectron spectroscopy, X-ray diffractometry, and transmission electron microscopy observation suggest that Li₂O–LiI provides nanoscale ion-conduction pathways during cycling that activate Li₂S and deliver large capacities; it also exhibits an appropriate onset oxidation voltage for high capacity. Furthermore, a cell with a high areal capacity of 10.6 mAh cm^–2 is demonstrated to successfully operate at 25 °C using a Li₂S–Li₂O–LiI positive electrode. This study represents a major step toward the commercialization of all-solid-state Li/S batteries.

更新日期：2023-05-01

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