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首页> 外文期刊>Advanced energy materials >Revisiting the Role of Hydrogen in Lithium-Rich Antiperovskite Solid Electrolytes: New Insight in Lithium Ion and Hydrogen Dynamics
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Revisiting the Role of Hydrogen in Lithium-Rich Antiperovskite Solid Electrolytes: New Insight in Lithium Ion and Hydrogen Dynamics

机译：Revisiting the Role of Hydrogen in Lithium-Rich Antiperovskite Solid Electrolytes: New Insight in Lithium Ion and Hydrogen Dynamics

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摘要

Li_2OHX (X = Cl or Br) with an antiperovskite structure possess the advantagesof low melting point, low cost, and ease of scaling-up, which showgreat promise for applications in all-solid-state Li metal batteries (ASSLMBs).However, Li-ion transport mechanisms in Li_2OHX are still debated and theinfluence of H on the electrochemical performance of Li_2OHX is yet to beexplored. Herein, combining the theoretical calculations and experimentalmeasurements, it is found that H affects Li-ion transport, crystal stability,electrochemical stability, and electronic conductivity of Li_2OHX. Comparedwith H-free Li_3OCl, although H helps to generate vacancy-like defects, theelectrostatic repulsive force between H and Li-ion leads to an increase inboth the activation energy and the diffusion length (space compensationeffect), resulting in special Li ion transport trajectories along the Li-O plane.Decreasing H content reduces the electronic conductivity and enhances thereduction-resistant ability of Li_2OHX, promoting the cycling stability and rateperformance of Li∣Li_2OHX∣Li symmetric cells and the ASSLMBs. This workdelivers a new insight into the role of H in antiperovskite Li_2OHX and canserve as guidance for solid electrolyte design.

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