Scholarlink

<p>Ion transport within the sub-micron diffusion layer at the electrode–electrolyte interface governs battery function, yet probing its rapid, confined dynamics under operating conditions remains a challenge. Here, we introduce a compact, highly sensitive multiresonant fiber-optic grating sensor that monitors these processes operando in sodium-ion batteries without interfering with their operation. Using this approach, we reveal an intermediate stage of ion transport between adsorption and diffusion at the interface. We find that a shorter duration of this intermediate stage correlates with superior fast-charging performance. Furthermore, by integrating the sensor’s optical intensity in real time, we achieve state-of-charge quantification with unprecedented accuracy (&gt;98%). This operando measurement platform offers a new capability for battery diagnostics and can inform the design of next-generation batteries with enhanced electrochemical properties.</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

Operando tracking of ion kinetics and state-of-charge via multiresonant fiber-optic grating sensors in sodium-ion batteries

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年6月26日

查看全文
  • Xile Han,
  • Jinliang Li,
  • Wen Wu,
  • Jiajian Long,
  • Xumiao Chen,
  • Yongqi Li,
  • Man Chen,
  • Gaozhi Xiao,
  • Yongjin Fang,
  • Wenjie Mai,
  • Tuan Guo

摘要

Ion transport within the sub-micron diffusion layer at the electrode–electrolyte interface governs battery function, yet probing its rapid, confined dynamics under operating conditions remains a challenge. Here, we introduce a compact, highly sensitive multiresonant fiber-optic grating sensor that monitors these processes operando in sodium-ion batteries without interfering with their operation. Using this approach, we reveal an intermediate stage of ion transport between adsorption and diffusion at the interface. We find that a shorter duration of this intermediate stage correlates with superior fast-charging performance. Furthermore, by integrating the sensor’s optical intensity in real time, we achieve state-of-charge quantification with unprecedented accuracy (>98%). This operando measurement platform offers a new capability for battery diagnostics and can inform the design of next-generation batteries with enhanced electrochemical properties.