Scholarlink

<p>High-voltage cathodes with high capacities are fundamental enablers of next-generation high-energy-density all-solid-state lithium batteries (ASSLBs). Co-free, spinel-structured lithium nickel manganese oxide (LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub>, LNMO) is a promising alternative to layered cathodes, considering its relatively low cost and high capacity with a high operating voltage. The interface failure between LNMO and solid-state electrolytes (SEs) in ASSLBs, especially at high voltages, is a major obstacle for practical applications. Here, we overcome this challenge and demonstrate the use of commercially available polycrystalline LNMO powders as a precursor for synthesizing submicron single-crystal LNMO in a molten salt environment, where the molten salt acts as a flux, causing adjacent primary particles in polycrystalline LNMO to fuse and grow. Consequently, the single-crystal LNMO delivers a higher specific capacity compared to pristine polycrystalline LNMO due to the improved contact with SEs and kinetics in composite cathodes. Moreover, a thin layer of Li<sub>2</sub>MoO<sub>4</sub> uniformly forms on the single-crystal LNMO during the molten salt synthesis, which significantly suppresses side reactions at high voltages and enables long-term stable cycling within a 4.8 V upper cutoff voltage.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Molten salt synthesis of a single-crystal LiNi0.5Mn1.5O4 cathode with an in situ constructed stable interface for 4.8 V-class all-solid-state batteries

  • 期刊论文

  • 发表日期：

    2025年5月7日

查看全文
  • Guang Sun,
  • Zhenyou Song,
  • Yiming Dai,
  • Qian Yu,
  • Qi Kang,
  • Zhongqiang Wang,
  • Yuwei Chen,
  • Yongping Shi,
  • Shixiang Qiao,
  • Zuke Xiao,
  • Wei Luo

摘要

High-voltage cathodes with high capacities are fundamental enablers of next-generation high-energy-density all-solid-state lithium batteries (ASSLBs). Co-free, spinel-structured lithium nickel manganese oxide (LiNi0.5Mn1.5O4, LNMO) is a promising alternative to layered cathodes, considering its relatively low cost and high capacity with a high operating voltage. The interface failure between LNMO and solid-state electrolytes (SEs) in ASSLBs, especially at high voltages, is a major obstacle for practical applications. Here, we overcome this challenge and demonstrate the use of commercially available polycrystalline LNMO powders as a precursor for synthesizing submicron single-crystal LNMO in a molten salt environment, where the molten salt acts as a flux, causing adjacent primary particles in polycrystalline LNMO to fuse and grow. Consequently, the single-crystal LNMO delivers a higher specific capacity compared to pristine polycrystalline LNMO due to the improved contact with SEs and kinetics in composite cathodes. Moreover, a thin layer of Li2MoO4 uniformly forms on the single-crystal LNMO during the molten salt synthesis, which significantly suppresses side reactions at high voltages and enables long-term stable cycling within a 4.8 V upper cutoff voltage.