Facile Synthesis of Lithium Sulfide Nanocrystals for Use in Advanced Rechargeable Batteries

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• 作者：Xuemin Li ; Colin A. Wolden ; Chunmei Ban ; Yongan Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 30, 2015
• 年：2015
• 卷：7
• 期：51
• 页码：28444-28451
• 全文大小：501K
• ISSN：1944-8252

文摘

This work reports a new method of synthesizing anhydrous lithium sulfide (Li₂S) nanocrystals and demonstrates their potential as cathode materials for advanced rechargeable batteries. Li₂S is synthesized by reacting hydrogen sulfide (H₂S) with lithium naphthalenide (Li-NAP), a thermodynamically spontaneous reaction that proceeds to completion rapidly at ambient temperature and pressure. The process completely removes H₂S, a major industrial waste, while cogenerating 1,4-dihydronaphthalene, itself a value-added chemical that can be used as liquid fuel. The phase purity, morphology, and homogeneity of the resulting nanopowders were confirmed by X-ray diffraction and scanning electron microscopy. The synthesized Li₂S nanoparticles (100 nm) were assembled into cathodes, and their performance was compared to that of cathodes fabricated using commercial Li₂S micropowders (1–5 μm). Electrochemical analyses demonstrated that the synthesized Li₂S were superior in terms of (dis)charge capacity, cycling stability, output voltage, and voltage efficiency.