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3D Interconnected Porous Carbon Aerogels as Sulfur Immobilizers for Sulfur Impregnation for Lithium‐Sulfur Batteries with High Rate Capability and Cycling Stability
Author(s) -
Zhang Zhiwei,
Li Zhaoqiang,
Hao Fengbin,
Wang Xuekun,
Li Qun,
Qi Yongxin,
Fan Runhua,
Yin Longwei
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201303080
Subject(s) - materials science , polysulfide , cathode , sulfur , dielectric spectroscopy , chemical engineering , electrochemistry , dissolution , carbon fibers , electrode , lithium–sulfur battery , porosity , cyclic voltammetry , lithium (medication) , aerogel , composite material , composite number , electrolyte , metallurgy , chemistry , medicine , engineering , endocrinology
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.