Enhancing ionic conductivity in Li₇P₃S₁₁ solid electrolytes via doping strategies: Implications for solid-state lithium-sulfur batteries

IF 3 4区 材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2025-03-15 DOI:10.1016/j.ssi.2025.116844
Amirhossein Mirtaleb, Ruigang Wang
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Abstract

Solid-state electrolytes in the Li₂S-P₂S₅ system have emerged as promising candidates for next-generation all-solid-state batteries (ASSBs) due to their high ionic conductivity and superior electrochemical stability. Among these, the Li₇P₃S₁₁ phase exhibits exceptional ionic conductivity (∼10−3 S cm−1 at room temperature), making it a focal point for materials research. This review provides a comprehensive analysis of dopant-driven modifications in Li₇P₃S₁₁, emphasizing their impact on structural evolution, ionic transport, electrochemical performance, and long-term stability. Both cationic (e.g., transition and alkali metals) and anionic (e.g., oxygen) doping strategies are examined, offering insights into their roles in optimizing ionic conductivity and interfacial compatibility. Sulfide dopants enhance lithium-ion mobility and interfacial stability with lithium metal and sulfur cathodes, while oxide dopants improve air stability and suppress dendrite formation. Nitride dopants, though beneficial for interfacial compatibility, may introduce additional resistance at electrode-electrolyte interfaces. Despite these advancements, challenges such as dopant-induced phase instability, synthesis complexity, and environmental sensitivity persist, necessitating a strategic approach to doping. By categorizing dopants based on their chemical interactions with the Li₇P₃S₁₁ matrix, this review outlines a framework for rational dopant selection and design. The insights presented herein provide a foundation for advancing doped solid electrolytes, accelerating the development of high-performance lithium‑sulfur batteries for next-generation energy storage applications.

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锂₂S-P₂S₅体系的固态电解质具有高离子电导率和优异的电化学稳定性,因此已成为下一代全固态电池(ASSB)的理想候选材料。其中,Li₇P₃S₁₁相表现出卓越的离子导电性(室温下为 ∼10-3 S cm-1),使其成为材料研究的焦点。本综述全面分析了 Li₇P₃S₁₁ 中掺杂剂驱动的改性,强调了它们对结构演化、离子传输、电化学性能和长期稳定性的影响。本文研究了阳离子(如过渡金属和碱金属)和阴离子(如氧)掺杂策略,深入探讨了它们在优化离子传导性和界面相容性方面的作用。硫化物掺杂物提高了锂离子迁移率以及与锂金属和硫阴极的界面稳定性,而氧化物掺杂物则改善了空气稳定性并抑制了枝晶的形成。氮化物掺杂剂虽然有利于界面兼容性,但可能会在电极-电解质界面产生额外的电阻。尽管取得了这些进步,但掺杂剂引起的相不稳定性、合成复杂性和环境敏感性等挑战依然存在,因此必须采取战略性的掺杂方法。本综述根据掺杂剂与 Li₇P₃S₁₁ 基质的化学作用对掺杂剂进行分类,从而勾勒出合理选择和设计掺杂剂的框架。本文提出的见解为推动掺杂固体电解质的发展奠定了基础,从而加速了下一代储能应用中高性能锂硫电池的开发。
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来源期刊
Solid State Ionics
Solid State Ionics 物理-物理:凝聚态物理
CiteScore
6.10
自引率
3.10%
发文量
152
审稿时长
58 days
期刊介绍: This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.
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