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<p>Lithium–sulfur batteries (LSBs) offer high theoretical energy density and cost advantages, but their commercialisation remains hindered by several technological&#xa0;challenges, such as the lithium polysulfide shuttle effect. This review critically assesses recent advances in sparingly solvating electrolytes (SSEs), including highly concentrated, localized high-concentration, and weakly solvating systems, as strategies for enabling lean-electrolyte operation and long cycle life. Through solvation structure modulation, SSEs have demonstrated the ability to regulate polysulfide solubility, promote the formation of stable interphases, and maintain efficient ion transport, particularly under lean conditions. The merits and limitations of each SSE class are discussed, with a focus on key design principles, environmental sustainability, and cell-level constraints. Emphasis is placed on the need for evaluation under practical operating conditions to assess scalability and commercial viability. Finally, future directions are proposed, including hybrid electrolyte architectures and dynamic solvation control, to advance the transition of LSBs from laboratory to market-ready technology.</p><p></p>

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Design strategies and future directions of sparingly solvating electrolytes for lithium-sulfur batteries

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月8日

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  • Sergi Gadea,
  • Asier Soria-Fernández,
  • Alexander Santiago,
  • Daniel Carriazo,
  • Julen Castillo

摘要

Lithium–sulfur batteries (LSBs) offer high theoretical energy density and cost advantages, but their commercialisation remains hindered by several technological challenges, such as the lithium polysulfide shuttle effect. This review critically assesses recent advances in sparingly solvating electrolytes (SSEs), including highly concentrated, localized high-concentration, and weakly solvating systems, as strategies for enabling lean-electrolyte operation and long cycle life. Through solvation structure modulation, SSEs have demonstrated the ability to regulate polysulfide solubility, promote the formation of stable interphases, and maintain efficient ion transport, particularly under lean conditions. The merits and limitations of each SSE class are discussed, with a focus on key design principles, environmental sustainability, and cell-level constraints. Emphasis is placed on the need for evaluation under practical operating conditions to assess scalability and commercial viability. Finally, future directions are proposed, including hybrid electrolyte architectures and dynamic solvation control, to advance the transition of LSBs from laboratory to market-ready technology.