首页|Accelerating lithium ion transport via increasing the entropy of the electrolyte for stable lithium metal batteries
Accelerating lithium ion transport via increasing the entropy of the electrolyte for stable lithium metal batteries
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Promoting inorganic-rich solid-electrolyte interphase(SEI)formation by constructing anion-rich solvated structures is a promising strategy for improving the long-term cycling of lithium-metal batteries.However,the increase of anions within the solvated structure inevitably reduces the coordination of Li+with the solvent,which leads to a low lithium diffusion coefficient and a decreased lithium conduc-tivity.Here,high entropy electrolyte is achieved by increasing the molecular diversity in electrolyte.Multiple anions(TFSI-,FSI-,NO3-and PF6-)presented in entropy electrolyte individually coordinate with Li+,creating a diverse and anion-rich solvation structure.The large variety of solvation structures leads to a diversified Li+diffusion barriers in the electrolyte,which results in the increase of channels available for Li+diffusion.Thus,three-dimensional diffusion with high Li+diffusion coefficient occurs in HE elec-trolytes.Furthermore,the anion-rich solvation structures promote the formation of the inorganic-rich SEI.As a result,over 2000 h of reversible Li plating/stripping with a low overpotential less than 27 mV is achieved in Li||Li cell using electrolyte modified by high-entropy strategy.Besides,the Li||LFP full cell with a negative capacity/positive capacity(N/P)ratio of 4.52 exhibits remarkably enhanced cycling sta-bility,retaining 83.6％of its initial capacity after 150 cycles.This strategy offers a novel approach for accelerating Li+transport kinetics and constructing stable SEI in lithium metal batteries.
Lithium metal batteries electrolyteEntropyLithium ion diffusionInorganic-rich SEI
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