Scholarlink

<p>Progress in extending the cycle life of lithium metal batteries has primarily been achieved through strategies focused on slow charging and fast discharging conditions, with limited practical impact. However, accelerated performance degradation under the opposite operation protocols—fast charging and slow discharging—remains a challenge. Here, we introduce (difluoromethyl)trimethylsilane with a large electrostatic potential difference as a diluent for localized high-concentration electrolytes. The presence of this diluent limits the size of ion clusters and promotes the transfer of Li ions through the swollen solid-electrolyte-interphase layer for robust fast charging. The diluent also increases electrode polarization, which leads to spatially uniform Li stripping sites and allows reliable discharging even at low current densities. As a result, the electrolyte achieves an average Coulombic efficiency of 98.12% even at 12 mA cm<sup>−2</sup> in Li <i>|</i> <i>|</i>Cu asymmetric cells. In full cells, a state-of-charge of 77.3% is achieved within 6 minutes while retaining 81.3% capacity after 200 cycles at a 10 C charging rate, demonstrating their stability under fast-charging and slow-discharging protocols.</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

Electrolyte diluent with large electrostatic potential difference for fast charging and slow discharging lithium metal batteries

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月25日

查看全文
  • Minkwan Kim,
  • Jinhyeong Kim,
  • Minsung Baek,
  • Jihoon Oh,
  • Jimin Lee,
  • Ali Coskun,
  • Jang Wook Choi

摘要

Progress in extending the cycle life of lithium metal batteries has primarily been achieved through strategies focused on slow charging and fast discharging conditions, with limited practical impact. However, accelerated performance degradation under the opposite operation protocols—fast charging and slow discharging—remains a challenge. Here, we introduce (difluoromethyl)trimethylsilane with a large electrostatic potential difference as a diluent for localized high-concentration electrolytes. The presence of this diluent limits the size of ion clusters and promotes the transfer of Li ions through the swollen solid-electrolyte-interphase layer for robust fast charging. The diluent also increases electrode polarization, which leads to spatially uniform Li stripping sites and allows reliable discharging even at low current densities. As a result, the electrolyte achieves an average Coulombic efficiency of 98.12% even at 12 mA cm−2 in Li | |Cu asymmetric cells. In full cells, a state-of-charge of 77.3% is achieved within 6 minutes while retaining 81.3% capacity after 200 cycles at a 10 C charging rate, demonstrating their stability under fast-charging and slow-discharging protocols.