A Stress Dispersive Quasi-Solid Polymer Electrolyte Enables Ah-Level Impact Tolerant Lithium-Metal Batteries

To maintain reliable voltage output under dynamic impact conditions, intrinsic, materials-level strategies are urgently needed to stabilize high-energy Li batteries. Here, a stress dispersive quasi-solid polymer electrolyte (SDPE) is proposed by constructing a crosslinked network from boroxine-junction tris(aryl-amide)-linked poly(2,2'-disulfonyl-4,4'-benzidine terephthalamide) for Ah-level Li batteries. This electrolyte integrates an ultra-rigid backbone for load distribution with more compliant boroxine junctions to accommodate localized deformation. As a result, it enables a durable Li plating/stripping for over 1400 h and delivers a high discharge capacity of 476.8 mAh g^-1 in Li/Cr₈O₂₁ primary batteries, while retaining 77.2% of the initial capacity after 7 days of storage at 60°C. Importantly, this intrinsic stability translates to device-level reliability. Ah-level pouch cells employing SDPE maintain a stable open-circuit voltage under impacts exceeding 19,000 g, whereas the liquid-electrolyte counterpart exhibits an immediate 384 mV voltage drop. Moreover, no hazardous response is observed even under nail penetration of the pouch cell. Combined with force-constant analysis revealing a stiff-skeleton/compliant-junction stress-transfer hierarchy, these results establish a direct structure-function linkage between molecular design and impact-tolerant energy delivery. This work provides a viable pathway toward intrinsically resilient batteries for operation under extreme mechanical conditions.