Electrolyte design weakens lithium-ion solvation energy for a fast-charging and long-cycling Si anode

Chemical Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Silicon (Si) is considered a promising anode material for next-generation lithium-ion batteries due to its high theoretical specific capacity and earth-abundancy. However, challenges such as significant volume expansion, unstable solid electrolyte interphase (SEI) formation in incompatible electrolytes, slow transport lead poor cycling rate performance. In this work, it demonstrated that superior cyclability capability of Si anodes can be achieved using ethyl fluoroacetate (EFA) fluoroethylene carbonate (FEC) solvents with low binding energy Li+ but sufficiently relative dielectric constants. By weakening the interaction between solvent, barrier desolvation process lowered, while ensuring conductivity diffusion Li+. As result, silicon-carbon optimized exhibits excellent performance, work reversibly 1709.1 mAh g-1 proceeds over 250 cycles retains 85.2% at 0.2C. Furthermore, Si/C‖LiFePO4 (LFP) full cell shows an extended service life more than 500 cycles. This offers valuable insights into design weakly solvating electrolytes high-performance Si-based batteries.

Language: Английский

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FeS2/SeS2 composite with a heterostructure toward high performance in lithium metal batteries

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 159315 - 159315

Published: Jan. 1, 2025

Language: Английский

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Pulse Current-Induced Homogeneous Phase Nucleation for High-Performance Conversion-Type Cathodes

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Conversion-type transition metal-based materials (MZx) are considered promising cathodes for lithium metal batteries due to their low cost, abundant availability, and high theoretical energy density. However, they suffer from rapid capacity decay caused by the transformation into two inhomogeneous phases during discharge. Herein, we use a pulse current discharge activation method (under 3C) induce homogeneous phase nucleations. As result, microsized FeS2 cathode transforms mixture of nanosized Fe Li2S, effectively mitigating volume expansion. It exhibits exceptional cycling performance, delivering specific 572.8 mAh g–1 after 800 cycles at 0.33C. Even areal 5.4 cm–2, it undergoes 180 with retention 89.3% This work highlights crucial role nucleation in achieving long life conversion-type cathodes.

Language: Английский

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Nano-structured FeS₂ Cathode for Lithium Metal Battery

Journal of Physics Conference Series, Journal Year: 2025, Volume and Issue: 2932(1), P. 012007 - 012007

Published: Jan. 1, 2025

Abstract FeS 2 is emerging as one of the promising cathode materials for high-energy-density energy storage systems. However, huge volume expansion and dissolution lithium polysulfides (LiPSs) result in poor cycling rate performance. Herein, nano-structured synthesized through a controllable solid-state reaction method, avoiding introducing harmful substances from waste generated by solvent reactions. Consequently, with reduced Li + diffusion exhibits an exceptional capacity 650.7 mAh g −1 (0.5 C, after 300 cycles). Moreover, it also demonstrates extremely good performance has high retention 74.8% even at C 780 cycles.

Language: Английский

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Electrolyte with single salt and single solvent enables FeS2-based lithium metal batteries with all-climate high performance

Energy storage materials, Journal Year: 2025, Volume and Issue: unknown, P. 104124 - 104124

Published: Feb. 1, 2025

Language: Английский

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Research progress on diluents of localized high-concentration electrolytes for high performance lithium metal batteries

Journal of Power Sources, Journal Year: 2025, Volume and Issue: 640, P. 236704 - 236704

Published: March 10, 2025

Language: Английский

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