Unravelling the Secrets of Magnetic Field-Enhanced Li + Ion Conduction in Solid-State Electrolytes

作者：Donggun Kim, Yimin Chen, Yimin Chen, Xin Hu, Qi Han, Baozhi Yu, Ying Chen, Ying Chen · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c04502 · 被引用次数：3 · 研究领域：Advanced Battery Materials and Technologies、Advancements in Battery Materials、Thermal Expansion and Ionic Conductivity

Solid-state lithium metal batteries (SSLMBs) promise high energy density but are limited by sluggish Li + transport and dendrite formation in solid-state electrolytes (SSEs). Here, we introduce an operational, rather than materials-based, strategy to accelerate ion conduction by applying an external magnetic field during cell operation. The field induces a magnetohydrodynamic (MHD) effect, where the Lorentz force between the ionic current and the magnetic field promotes Li + mobility and directs ion motion along favorable pathways. Under 240 mT, the ionic conductivity of an ion gel SSE rises from 7.44 × 10 –4 S cm –1 to 1.64 × 10 –3 S cm –1 and the Li + transference number increases from 0.181 to 0.277 at 25 °C. Consequently, SSLMBs with a LiFePO 4 cathode achieve 157.2 mAh g –1 after 250 cycles with 96.3% capacity retention. This work elucidates magnetic-field-enhanced Li + conduction and offers a simple, scalable route to boost SSE performance toward practical, high-energy SSLMBs.