期刊
IONICS
卷 27, 期 11, 页码 4761-4770出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-021-04231-6
关键词
Lithium-sulfur battery; Cathode materials; Porous carbon; Metal-organic frameworks; Aluminum fluoride
资金
- National Natural Science Foundation of China [51772254, 11472236, 11902283]
- Natural Science Foundation of Hunan Province, China [2019JJ50578]
- National Training Program of Innovation, Entrepreneurship for Undergraduates [201510530004]
- Innovation Team of Hunan Province [2018RS3091]
By utilizing metal-organic frameworks and glucose to synthesize porous carbon materials, and introducing aluminum fluoride into the sulfur electrode, the performance and cyclic stability of lithium-sulfur batteries can be significantly improved.
Lithium-sulfur (Li-S) battery has now gradually emerged as the representative secondary energy storage battery of low cost, high security, and high theoretical specific capacity (1675 mAh g(-1)). However, the insulation properties of sulfur and shuttle issue of polysulfides between electrolytes lead to poor coulombic efficiency and performance of sulfur cathode. Therefore, we use metal-organic frameworks (MOFs) as pore-forming agent and glucose as primary carbon source to synthesize a honeycomb structured porous carbon (PC) material with high specific surface area (2151.9 m(2) g(-1)) and large mesopore volume (2.16 cm(3) g(-1)), which acts as the conductive skeleton for sulfur cathode. Furthermore, after mixing a trace of aluminum fluoride (AlF3) into sulfur electrode, the corresponding cycle performance and electrochemical stability have been further improved. The AlF3 center dot 3H(2)O/PC/S composition with 80 wt% sulfur loading exhibits the highest discharge capacity of 1298.1 mAh g(-1) at the current density of 1 C and maintains at 455.6 mAh g(-1) with similar to 99% coulombic efficiency after 500 cycles. This work supplies a facile and effective strategy for manufacture of more progressive porous carbonaceous sulfur host material and improving practical performance of Li-S batteries.
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