Covalent organic frameworks (COFs) as fast lithium-ion transport fillers for solid polymer electrolytes

被引:0
|
作者
Zhang, Chaoyan [1 ]
Jiang, Zhen [2 ]
Guo, Peng [1 ]
Song, Jianjun [1 ]
Shi, Chuan [1 ]
机构
[1] Qingdao Univ, Coll Phys, Qingdao 266071, Peoples R China
[2] Univ Penn, Dept Chem, Philadelphia, PA 19104 USA
基金
中国国家自然科学基金;
关键词
Covalent organic frameworks; Solid polymer electrolytes; Fillers; Polyvinylidene fluoride; Solid lithium metal batteries; MECHANISMS;
D O I
10.1016/j.cej.2024.158146
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The incorporation of inorganic electrolyte fillers into solid polymer electrolytes (SPEs) provides fast Li-ion transport channels, enhancing the ionic conductivity of SPEs. However, their insufficient specific surface area and poor compatibility with the polymer matrix impede the efficient diffusion of Li-ions from polymer into fillers, thereby limiting further advancements in SPEs. To address this challenge, we propose the utilization of covalent organic frameworks (COFs), TpPa-SO3Li, as fillers due to their rapid Li+ transport properties, favorable compatibility with the polymer matrix, and ultra-high specific surface area. Validated by in-situ conductive AFM and DFT calculation, TpPa-SO3Li provides high-speed Li+ transport pathways in the polyvinylidene fluoridebased SPEs (PVDF-TpPaSO3Li). This is attributed to their higher affinity energy of -1.93 eV compared to 1.34 eV of PVDF and their low Li+ migrating barrier of 0.35 eV. Consequently, PVDF-TpPaSO3Li exhibits an outstanding ion conductivity of 1.93 mS cm-1 at 30 degrees C, an enhanced ion transfer number of 0.44, and a desirable mechanical strength of 13.5 MPa. The lithium-symmetrical batteries with PVDF-TpPaSO3Li exhibit stable Li stripping/plating cycling for 2500h at 60 degrees C and 0.1 mA cm-2. Similarly, LiFePO4/Li batteries also display stable cycling with a retention in capacity of 93.83 % after 300 cycles at 0.5C.
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页数:9
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