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Microstructural analyses of all-solid-state Li–S batteries using LiBH4-based solid electrolyte for prolonged cycle performance

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Journal of Energy Chemistry 2020年第11期29卷 424-429页

作者： Kazuaki Kisu sangryun kim Ryuga Yoshida Hiroyuki Oguchi Naoki Toyama Shin-ichi Orimo Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversityKatahira 2-1-1Aoba-kuSendai 980-8577Japan Institute for Materials Research(IMR) Tohoku UniversityKatahira 2-1-1Aoba-kuSendai 980-8577Japan

Complex hydride materials have been widely investigated as potential solid electrolytes because they have good compatibility with the lithium metal anodes used in all-solid-state batteries. However, the development of all-solid-state batteries utilizing complex hydrides has been difficult as these cells tend to have short cycle lives. This study investigated the capacity fading mechanism of all-solid-state lithium–sulfur(Li–S) batteries using Li4(BH4)3I solid electrolytes by analyzing the cathode microstructure. Crosssectional scanning electron microscopy observations after 100 discharge–charge cycles revealed crack formation in the Li4(BH4)3I electrolyte and an increased cathode thickness. Raman spectroscopy indicated that decomposition of the Li4(BH4)3I solid electrolyte occurred at a constant rate during the cycling *** combat these effects, the cycle life of Li–S batteries was improved by increasing the amount of solid electrolyte in the cathode.

关键词： All-solid-state battery Complex hydride solid electrolyte Li metal anode Li–S battery Microstructure

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Room temperature operation of all-solid-state battery using a closo-type complex hydride solid electrolyte and a LiCoO_(2) cathode by interfacial modification

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Journal of Energy Chemistry 2020年第4期29卷 47-51页

作者： sangryun kim Kentaro Harada Naoki Toyama Hiroyuki Oguchi Kazuaki Kisu Shin-ichi Orimo Institute for Materials Research Tohoku UniversitySendai 980-8577Japan WPI-Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan New Industry Creation Hatchery Center(NICHe) Tohoku UniversitySendai 980-8579Japan

We report on an all-solid-state battery that employs a closo-type complex hydride solid electrolyte and a LiCoO2 *** modification between the solid electrolyte and cathode with a LiNbO3 buffer layer enables reversible charge-discharge cycling with a cell voltage of 3.9V (***^+/Li) at room *** analyses clarify that the given modification effectively suppresses side reactions at the cathode/solid electrolyte *** interfacial resistance is lowered by ca.10 times with a 5 nm thick LiNbO3 buffer layer compared to that without a buffer layer,so that a discharge capacity of 109 mAh g^-1 is *** results suggest that interfacial modification can be a viable approach to the development of high-voltage all-solid-state batteries using closo-type complex hydride solid electrolytes and oxide cathodes.

关键词： All-solid-state batteries Closo-type complex hydride Solid electrolyte High-voltage cathodes Interfacial modification

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维普期刊数据库

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Lithium ion conductivity of complex hydrides incorporating multiple closo–type complex anions

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Journal of Energy Chemistry 2019年第11期28卷 84-87页

作者： Naoki Toyama sangryun kim Hiroyuki Oguchi Toyoto Sato Shigeyuki Takagi Masaru Tazawa Genki Nogami Shin-ichi Orimo Institute for Materials Research Tohoku UniversityKatahira 2-1-1Aoba-kuSendai 980-8577Japan WPI-Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversityKatahira 2-1-1Aoba-kuSendai 980-8577Japan Mitsubishi Gas Chemicals Co. Inc.182 Tayuhama ShinwariKita-kuNiigata 950-3112Japan

We report the lithium ionic conductivities of closo –type complex hydrides synthesized from various molar ratios of lithium borohydride(LiBH4) and decaborane(B10H14) as starting materials. The prepared closo –type complex hydrides comprised [B12H12]^2-, [B11H11]^2-, and [B10H10]^2- complex anions. In addition, increasing the LiBH4 content in the starting materials increased the amounts of [B11H11]^2- and [B10H10]^2-, leading to an improved ion conductivity of the prepared sample. The present study offers useful insights into strategies for controlling the complex anion composition in emerging solid electrolytes of closo-type complex hydrides at the molecular level, and improving their ionic conductivities.

关键词： Closo-type complex hydride Solid electrolyte Lithium ion conductivity Multiple complex anions

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