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- Title
3D Interconnected Porous Carbon Aerogels as Sulfur Immobilizers for Sulfur Impregnation for Lithium-Sulfur Batteries with High Rate Capability and Cycling Stability.
- Authors
Zhang, Zhiwei; Li, Zhaoqiang; Hao, Fengbin; Wang, Xuekun; Li, Qun; Qi, Yongxin; Fan, Runhua; Yin, Longwei
- Abstract
To eliminate capacity-fading effects due to the loss of sulfur cathode materials as a result of polysulfide dissolution in lithium-sulfur (Li-S) cells, 3D carbon aerogel (CA) materials with abundant narrow micropores can be utilized as an immobilizer host for sulfur impregnation. The effects of S incorporation on microstructure, surface area, pore size distribution, and pore volume of the S/CA hybrids are studied. The electrochemical performance of the S/CA hybrids is investigated using electrochemical impedance spectroscopy, galvanostatical charge-discharge, and cyclic voltammetry techniques. The 3D porous S/CA hybrids exhibit significantly improved reversible capacity, high-rate capability, and excellent cycling performance as a cathode electrode for Li-S batteries. The S/CA hybrid with an optimal incorporating content of 27% S shows an excellent reversible capacity of 820 mAhg−1 after 50 cycles at a current density of 100 mAg−1. Even at a current density of 3.2C (5280 mAg−1), the reversible capacity of 27%S/CA hybrid can still maintain at 521 mAhg−1 after 50 cycles. This strategy for the S/CA hybrids as cathode materials to utilize the abundant micropores for sulfur immobilizers for sulfur impregnation for Li-S battery offers a new way to solve the long-term reversibility obstacle and provides guidelines for designing cathode electrode architectures.
- Subjects
AEROGELS; LITHIUM sulfur batteries; COLLOIDS; ELECTRIC batteries; CERAMIC materials; ELECTROCHEMICAL analysis; IMPEDANCE spectroscopy
- Publication
Advanced Functional Materials, 2014, Vol 24, Issue 17, p2500
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201303080