Solid State Enabled Reversible Four Electron Storage

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.

Ultra‐thin Solid‐State Li‐Ion Electrolyte Membrane Facilitated by a Self‐Healing Polymer Matrix

“…[ 10 ] On the other hand, the sulfi de family of solid electrolytes, such as Li 10 MP 2 S 12 crystals and Li 2 S-P 2 S 5 glass ceramics, have lithium-ion conductivities comparable to liquid electrolytes, can be simply processed by cold-compacting the powders, and exhibit ductile-like mechanical properties. [ 3,11,12 ] Thus, the present study makes use of the sulfi de the development of malleable covalent network polymers, often called vitrimers. Vitrimers are capable of stress relaxation and fl ow due to dynamic covalent bonding of reversible crosslinks within the network.…”

Morphology controllable syntheses of micro- and nano-iron pyrite mono- and poly-crystals: a review

“…The sputtering deposition, [125][126][127][128][129] microwave, [130][131][132] plasma, 91,124 magnetic eld, 133 electrochemical deposition, 134 pulsed electron ablation 135 and mechanical milling 136 were employed to synthesize iron pyrite. However, not all of these highly efficient methods could be the appropriate ones to synthesize iron pyrite crystals with the designed morphologies.…”

Mechanism and Solution for the Capacity Fading of Li/FeS2Battery

“…15 Based on the above redox mechanism, the C-FeS 2 composites [16][17][18][19][20][21] and carbon-modified/wrapped FeS 2 materials [22][23][24][25] with various novel structures, such as nanocrystals, 4 microspheres 26,27 and core-shell structures, 28 have been widely synthesized to improve the cyclability and power capability of the Li/FeS 2 cells. On the other hand, the solid-state electrolyte, 11,[29][30][31][32] polymer composite electrolyte, 6,11,29,30 and ionic liquid 33 have been proposed to prevent the dissolution of Li 2 S n . More recently, the strong nucleophilic reactivity of polysulfide anions has come into attention, and it has been recognized that the carbonate-based electrolytes currently z E-mail: shengshui.zhang.civ@mail.mil; shengshui@gmail.com used in state-of-the-art Li-ion batteries are chemically incompatible with the Li/FeS 2 chemistry.…”