调节溶解结构和离子传输,通过易斯基双功能共价有机聚合物分离器,用于无树的金属阳极
Hao Wu1, Xinying Wang1, Wenguang Wang1
1School of Materials and Energy, Guangdong University of Technology, Guangzhou Higher Education Mega Centre, No. 100 Waihuan Xi Road, Guangzhou 510006, P. R. China.
ACS nano
|December 22, 2025
概括
在聚烯分离器中集成的一种新型共价有机聚合物 (COP-DQCC) 有效地抑制了树脂的生长,并增强了金属阳极 (LMA) 中的固体电解质接口稳定性. 这一突破可以实现稳定的循环,并促进高能量密度电池.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物化学 聚合物化学
背景情况:
- 在金属阳极 (LMA) 中,高的Li+溶解能量导致树的生长和固体电解质接口 (SEI) 的不稳定性,阻碍了商业化.
- 目前的LMA技术面临着缓慢的动力学,劣质的离子运输和有限的循环寿命的挑战.
研究的目的:
- 开发一种功能化的分离材料,以提高LMA中离子运输和稳定性.
- 研究一种新型共价有机聚合物对涂/剥离行为和SEI形成的影响.
主要方法:
- 基于易斯的N/O双功能共价有机聚合物 (COP-DQCC) 的设计和合成.
- 将COP-DQCC集成到商用聚烯分离器中.
- 电化学性能测试 (对称电池,LiFePO4/LMA电池) 和现场光学显微镜.
- 使用飞行时间二次离子质谱法 (ToF-SIMS) 和理论计算进行表征.
主要成果:
- COP-DQCC增强了盐解离和Li+溶解,减少了溶剂运输和加速了Li+迁移.
- 修改后的分离器有效地抑制了树的生长,并促进了的均沉积.
- 形成了一个稳定的,富含LiF的SEI层,调节离子运输.
- 对称细胞在1.0 mA cm-2下2400小时,在4.0 mA cm-2下900小时表现出稳定的循环.
- FePO4/COP-DQCC@PP/Li电池表现出极好的循环稳定性,在1.0°C的1200个循环后保持84.6%的容量.
结论:
- 经过COP-DQCC修改的分离器显著提高了LMA的电化学性能和稳定性.
- 这种方法提供了一个有前途的策略,用于开发耐用,无树的阳极,用于高能量密度电池.
- 这项研究强调了功能化共价有机聚合物在先进电池技术中的潜力.
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