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

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...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2014-11, Vol.136 (46), p.16116-16119
Main Authors: Cho, Jae-Hyun, Aykol, Muratahan, Kim, Soo, Ha, Jung-Hoon, Wolverton, C, Chung, Kyung Yoon, Kim, Kwang-Bum, Cho, Byung-Won
Format: Article
Language:English
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Summary: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.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja508463z