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JOURNAL OF THE ELECTROCHEMICAL SOCIETY · 2017 ·Vol. 164 ·期 14 ·A3649 · IF 3.259

Commercial Carbon Molecular Sieves as a Na+-Storage Anode Material in Dual-Ion Batteries

Xiaohong Wang,Li Qi,Hongyu Wang

The commercial carbon molecular sieve (CMS) displays outstanding performance with high reversible capacity at a low potential, superior cyclic stability, and fast diffusion of Na+ cations, which indicate that CMS anode can couple with graphite cathode well in sodium-based dual-ion batteries (NDIBs). NDIBs with pre-sodiated CMS anode and graphite cathode exhibit exceptional properties, such as high voltage, long cycle life, and impressive energy and power densities. Furthermore, we optimize the working conditions of NDIBs and clarify the influences of cutoff voltage and the graphite/CMS mass ratio.

研究领域: 材料科学 · 电化学

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JOURNAL OF MEMBRANE SCIENCE · 2023 · IF 9.5

Small molecule DOPO-p-DP crosslinked 6FDA-DAM-Br-85% carbon molecular sieve membrane with superior aging for efficient gas separation

Xiuling Chen,Lei Wu,Cong Xie,Shan Xu,Yanfang Fan,Nanwen Li

Carbon molecular sieve (CMS), as the gas separation membrane materials, still faces challenges for regulation pore diameter precisely. In this work, we propose to reconstruct the 6FDA-DAM-Br-85% polyimide CMS membranes by introducing 6,6'-(1,4-phenylenebis(((4-hydroxyphenyl)amino)methylene))bis(dibenzo[c,e][1,2] oxaphosphinine6-oxide) small molecule compound (DOPO- p -DP) as crosslinking agent to regulate the pore distribution. The crosslinked precursors were obtained via the reaction between C–Br bond in 6FDA-DAM-Br-85% polyimide and N–H bond in DOPO- p -DP compound, the precursors and CMS membranes (550 °C- 2 h) were characterized with ATR-TFIR, XRD and XPS. The pore size distribution of crosslinked CMS membranes was range in 4.5–8.0 Å from the N 2 adsorption data. The crosslinked CMS membranes exhibited excellent gas separation performance, which was strongly dependent on the mass fraction of DOPO- p -DP, an increasing mass fraction of DOPO- p -DP leaded to improve in gas selectivity, while reduced its permeability. The 6FDA-DAM-Br-85%/DOPO- p -DP-20% CMS membrane showed the impressive permeability and superior gas selectivity, the permeabilities of O 2 , CO 2 , and H 2 are 798, 3018, and 13560 Barrer combined with the O 2 /N 2 , CO 2 /CH 4 , and H 2 /CH 4 selectivities of 7.8, 65.6, and 294.8 respectively, the separation performances surpassed the latest trade-off relationship. In addition, the 20% of the DOPO- p -DP crosslinked CMS membrane revealed the superior aging behaviour than that of the 6FDA-DAM-Br-85% CMS membrane over 480 h aging under vacuum conditions.

研究领域: 材料科学 · 化学工程

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Commercial Carbon Molecular Sieves as a Na+-Storage Anode Material in Dual-Ion Batteries

Small molecule DOPO-p-DP crosslinked 6FDA-DAM-Br-85% carbon molecular sieve membrane with superior aging for efficient gas separation