在广泛的温度范围内通过离子交换战略显著提高了基于离子MOF的固态电解质的电化学性能
Changqi Gu1, Wenyu Ding1, Sheng Jin1
1College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P.R. China. kangxm@imu.edu.cn.
Dalton transactions (Cambridge, England : 2003)
|August 18, 2025
概括
这项研究开发了用于固态电解质 (SSEs) 的新型后改性金属有机框架 (MOF) 材料. 优化的Li+@Ni-MOF-2显示出高级离子电池的优越离子导电性和稳定性.
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:
- 低离子导电率和高激活能限制固态电解质 (SSE) 的发展.
- 金属有机框架 (MOF) 由于其可调节的结构,具有作为SSE的潜力.
研究的目的:
- 为了提高SSE性能,合成和表征后修改的MOF材料.
- 研究基于MOF的新型SSE的离子导电性,离子传输和电化学稳定性.
主要方法:
- 通过离子交换合成一系列Li+@Ni-MOF-X材料.
- 结构性和电化学性质的表征,包括离子导电性 (σ),转移数 (tLi+) 和电化学稳定窗口 (ESW).
- 测试LiFePO4RadyoLi+@Ni-MOF-2RadyoLi全细胞的循环稳定性.
主要成果:
- +@Ni-MOF-2表现出显著增强的性能: σ = 1.28 × 10−3 S cm−1,tLi+ = 0.76,和ESW = 5.3 V 在室温下.
- 在-40°C (2.12 × 10−4 S cm−1) 保持出色的导电性,激活能量极低 (Ea = 0.08 eV),从10°C到100°C.
- 完整电池在150个周期内表现出稳定的循环运行,容量保持率为81.30%.
结论:
- 用Li+对Ni-MOF进行后修改显著提高了SSE性能.
- +@Ni-MOF-2在广泛的温度范围内显示出对实用的离子SSE应用的希望.
- 这项工作扩大了基于MOF的SSEs的库,用于先进的能源存储.
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