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Solid State Enabled Reversible Four Electron Storage |
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| Authors: | Thomas A Yersak H Alex Macpherson Seul Cham Kim Viet‐Duc Le Chan Soon Kang Seoung‐Bum Son Yong‐Hyun Kim James E Trevey Kyu Hwan Oh Conrad Stoldt Se‐Hee Lee |
| Institution: | 1. Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309‐0427 USA;2. Department of Materials Science and Engineering, Seoul National University, Seoul, 151‐742, Korea;3. Graduate School of Nanoscience and Technology (WCU), KAIST, Daejeon 305‐701, Korea;4. HRL Laboratories Limited Liability Company, Malibu, CA 90265‐4797 USA |
| Abstract: | We report that a solid‐state battery architecture enables the reversible, four electron storage of fully utilized solvothermally synthesized cubic‐FeS2 (pyrite). With a sulfide based glass electrolyte we successfully confine electro‐active species and permit the safe use of a lithium metal anode. These FeS2/Li solid‐state cells deliver a theoretical specific capacity of 894 mAh g?1 at 60 °C. We find that nanoparticles of orthorhombic‐FeS2 (marcasite) are generated upon recharge at 30–60 °C which explains a coincident change in rate kinetics. |
| Keywords: | iron disulfide lithium metal solid state battery reversible marcasite pyrite |