Controlling the Intercalation Chemistry to Design High-Performance Dual-Salt Hybrid Rechargeable Batteries

详细信息    查看全文

• 作者：Jae-Hyun Cho ; Muratahan Aykol ; Soo Kim ; Jung-Hoon Ha ; C. Wolverton ; Kyung Yoon Chung ; Kwang-Bum Kim ; Byung-Won Cho
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：November 19, 2014
• 年：2014
• 卷：136
• 期：46
• 页码：16116-16119
• 全文大小：349K
• ISSN：1520-5126

文摘

We have conducted extensive theoretical and experimental investigations to unravel the origin of the electrochemical properties of hybrid Mg²⁺/Li⁺ rechargeable batteries at the atomistic and macroscopic levels. By revealing the thermodynamics of Mg²⁺ and Li⁺ co-insertion into the Mo₆S₈ cathode host using density functional theory calculations, we show that there is a threshold Li⁺ activity for the pristine Mo₆S₈ cathode to prefer lithiation instead of magnesiation. By precisely controlling the insertion chemistry using a dual-salt electrolyte, we have enabled ultrafast discharge of our battery by achieving 93.6% capacity retention at 20 C and 87.5% at 30 C, respectively, at room temperature.