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<p>Lithium-sulfur (Li-S) batteries hold considerable promise as a next-generation energy storage technology, exhibiting high theoretical specific energy and capacity. However, their commercialization is hindered by challenges such as the shuttle effect of lithium polysulfides (LiPSs) and slow redox kinetics. In this study, nickel-iron layered double hydroxides (NiFe-LDHs) with varying Ni:Fe ratios are synthesized and utilized as interlayers for Li-S batteries. Among the samples, the NiFe-LDH-3 (Ni:Fe = 3:1) interlayer demonstrated the optimal performance. Li-S batteries with NiFe-LDH-3 interlayer demonstrated an initial capacity of 1469 mAh g<sup>−1</sup> at 0.1 C. The reversible capacity is recorded at 424 mAh g<sup>−1</sup> after 400 cycles at 0.5 C. The low capacity decay rate is determined to be 0.147% per cycle. The superior performance can be attributed to the NiFe-LDH-3 interlayer’s capacity for chemical adsorption of LiPSs, physical obstruction of LiPSs migration via its layered configuration, facilitation of Li⁺ transport, and catalyzation of LiPSs conversion through the redox activity of Ni and Fe ions. Consequently, this effectively inhibits the shuttle effect and accelerates reaction kinetics. This work demonstrates that NiFe-LDHs interlayers are effective in enhancing the performance of Li-S batteries.</p>

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Nickel-iron bimetallic hydroxide as an interlayer for enhanced polysulfide trapping and redox kinetics in high-performance Lithium-sulfur batteries

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Fenglin Zhao,
  • Shunhong Chen,
  • Yuxin Li,
  • Mengyue Li,
  • Hang Zhao

摘要

Lithium-sulfur (Li-S) batteries hold considerable promise as a next-generation energy storage technology, exhibiting high theoretical specific energy and capacity. However, their commercialization is hindered by challenges such as the shuttle effect of lithium polysulfides (LiPSs) and slow redox kinetics. In this study, nickel-iron layered double hydroxides (NiFe-LDHs) with varying Ni:Fe ratios are synthesized and utilized as interlayers for Li-S batteries. Among the samples, the NiFe-LDH-3 (Ni:Fe = 3:1) interlayer demonstrated the optimal performance. Li-S batteries with NiFe-LDH-3 interlayer demonstrated an initial capacity of 1469 mAh g−1 at 0.1 C. The reversible capacity is recorded at 424 mAh g−1 after 400 cycles at 0.5 C. The low capacity decay rate is determined to be 0.147% per cycle. The superior performance can be attributed to the NiFe-LDH-3 interlayer’s capacity for chemical adsorption of LiPSs, physical obstruction of LiPSs migration via its layered configuration, facilitation of Li⁺ transport, and catalyzation of LiPSs conversion through the redox activity of Ni and Fe ions. Consequently, this effectively inhibits the shuttle effect and accelerates reaction kinetics. This work demonstrates that NiFe-LDHs interlayers are effective in enhancing the performance of Li-S batteries.