Wang Lin, Qu Yunpeng, Xu Shugang, Jin Xin, Pei Mengfan, Li Borui, Su Chang, Jian Xigao, Hu Fangyuan
School of Materials Science and Engineering, State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, Technology Innovation Center of High Performance Resin Materials (Liaoning Province), Dalian University of Technology, Dalian, 116024, China.
State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Technology Innovation Center of High Performance Resin Materials (Liaoning Province), Dalian University of Technology, Dalian, 116024, China.
Small. 2025 Jul;21(27):e2503672. doi: 10.1002/smll.202503672. Epub 2025 May 28.
The pursuit of safe lithium metal batteries (LMBs) with ultrahigh energy density is fundamentally challenged by thermal runaway risks. This study proposes a thermal management strategy through the rational design of a multifunctional gel polymer electrolyte (PPW@GPE). By engineering phase change materials (paraffin wax) within flame-retardant PPBES copolymer matrices via coaxial electrospinning, a self-regulating separator with a dual-phase thermal response is constructed. Subsequent in situ polymerization immobilizes liquid electrolytes into a 3D crosslinked network, achieving simultaneous temperature modulation and ionic conduction optimization. The electrolyte can achieve a uniform hotspot, improve the electrochemical performance and safety of the battery, restrain hotspots, and mitigate temperature rise. In addition, PPW@GPE has excellent flame retardant properties and effectively forms the stabilized carbon layer at high temperatures, effectively protecting battery safety. This Li/PPW@GPE/LFP cell has excellent cycling performance, maintaining 500 stable cycles at 0.2C with only 0.0596% degradation per cycle. In addition, the fluorine-containing monomer helps to form a stable SEI layer and inhibits the growth of lithium dendrites. Through intelligent detection and Comsol simulation, the safety effectiveness of the battery under localized hot spots and external penetration nailing conditions is verified, which provides a new idea for the battery thermal management system.
追求具有超高能量密度的安全锂金属电池（LMB）从根本上受到热失控风险的挑战。本研究通过合理设计多功能凝胶聚合物电解质（PPW@GPE）提出了一种热管理策略。通过同轴静电纺丝在阻燃PPBES共聚物基体中构建相变材料（石蜡），制备了具有双相热响应的自调节隔膜。随后的原位聚合将液体电解质固定在三维交联网络中，实现了温度调制和离子传导优化的同步。该电解质能够实现均匀热点，提高电池的电化学性能和安全性，抑制热点并减轻温度上升。此外，PPW@GPE具有优异的阻燃性能，在高温下能有效形成稳定的碳层，有效保护电池安全。这种Li/PPW@GPE/LFP电池具有优异的循环性能，在0.2C下保持500次稳定循环，每次循环仅降解0.0596%。此外，含氟单体有助于形成稳定的固体电解质界面（SEI）层并抑制锂枝晶的生长。通过智能检测和Comsol模拟，验证了电池在局部热点和外部穿透钉扎条件下的安全有效性，为电池热管理系统提供了新思路。
