材料科学
聚合物电解质
锂(药物)
电解质
聚合物
固态
快离子导体
化学工程
纳米技术
工程物理
复合材料
离子电导率
物理化学
电极
医学
化学
工程类
内分泌学
作者
Xuemin Shi,Zhuangzhuang Jia,Donghai Wang,Bowen Jiang,Yaqi Liao,Zhang Guo-hua,Qingsong Wang,Danqi He,Yunhui Huang
标识
DOI:10.1002/adma.202405097
摘要
Abstract Extensively‐used rechargeable lithium‐ion batteries (LIBs) face challenges in achieving high safety and long cycle life. To address such challenges, ultrathin solid polymer electrolyte (SPE) is fabricated with reduced phonon scattering by depositing the composites of ionic‐liquid (1‐ethyl‐3‐methylimidazolium dicyamide, EMIM:DCA), polyurethane (PU) and lithium salt on the polyethylene separator. The robust and flexible separator matrix not only reduces the electrolyte thickness and improves the mobility of Li + , but more importantly provides a relatively regular thermal diffusion channel for SPE and reduces the external phonon scattering. Moreover, the introduction of EMIM:DCA successfully breaks the random intermolecular attraction of the PU polymer chain and significantly decreases phonon scattering to enhance the internal thermal conductivity of the polymer. Thus, the thermal conductivity of the as‐obtained SPE increases by approximately six times, and the thermal runaway (TR) of the battery is effectively inhibited. This work demonstrates that optimizing thermal safety of the battery by phonon engineering sheds a new light on the design principle for high‐safety Li‐ion batteries.
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