三维共价有机框架与密集的性基站点作为保护层,以实现高性能金属电池
Shuang Zheng1,2, Yubin Fu3,4, Shuai Bi5
1CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute (SARI), Chinese Academy of Sciences (CAS), Shanghai, 201210, P. R. China.
Angewandte Chemie (International ed. in English)
|November 5, 2024
概括
一种具有性位点的新型3D共价有机框架 (COF) 保护金属电池,通过实现均沉积和快速离子传输来提高寿命和效率.
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
- 纳米技术 纳米技术
背景情况:
- 金属电池具有高能量密度,但由于树突和低库伦比效率 (CE) 的原因,其寿命很短.
- 为阳极开发有效的保护层对于提高电池性能和循环寿命至关重要.
研究的目的:
- 设计和合成一个三维 (3D) 性有机框架 (COF) 与丰富的性位作为无氧保护层使用.
- 调查COF促进均沉积的能力,并提高金属电池的电化学性能.
主要方法:
- 采用了 [6+4] 合成策略,使用循环三酸衍生物化物和基于氨酸的四乙烯胺来创建3D COF.
- 合成的COF的特点是其结构性质和性位密度 (32.32 wt%).
- 使用Li/Por-PN-COF-Cu细胞和LiFePO4全细胞评估了电化学性能,包括库伦比克效率,循环寿命和离子运输研究.
主要成果:
- 3D COF展示了密集的性位,促进了均的Li + 流量,并使沉积非常光滑和紧.
- /-PN-COF-Cu电池在320个周期内实现了99.1%的平均CE记录,使用稳定的涂层.
- COF促进了快速的Li+运输 (Li+传输数为0.87),并使LiFePO4全细胞在5C时也能够稳定地剥离/.
结论:
- 开发的3D COF作为金属电池的有效阳极保护层,显著提高了循环寿命和库伦比效率.
- 氧化的性质和3D结构增强了Li+的运输,促进了均的Li沉积,减轻了树突的形成.
- 理论计算证实了+与COF的强烈相互作用,表明其对下一代高能量密度电池的潜力.
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