Improvement of Rate and Cycle Performence by Rapid Polyaniline Coating of a MWCNT/Sulfur Cathode

被引:179
作者
Wu, Feng [1 ,2 ]
Chen, Junzheng [1 ]
Li, Li [1 ,2 ]
Zhao, Teng [1 ]
Chen, Renjie [1 ,2 ]
机构
[1] Beijing Inst Technol, Beijing Key Lab Environm Sci & Engn, Sch Chem Engn & Environm, Beijing 100081, Peoples R China
[2] Natl Dev Ctr High Technol Green Mat, Beijing 100081, Peoples R China
关键词
RECHARGEABLE LITHIUM BATTERIES; MULTIWALLED CARBON NANOTUBES; ELECTROCHEMICAL PROPERTIES; SULFUR CATHODE; COMPOSITE CATHODE; RATE CAPABILITY; GELATIN BINDER; DIMETHYLFORMAMIDE; SUPERCAPACITOR; POLYSULFIDES;
D O I
10.1021/jp207893d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Rapid in situ chemical oxidation polymerization of polyaniline was carried out to coat MWCNT-core/sulfur-shell structures. The S-coated-MWCNTs were obtained by ball-milling and thermal treatment. The polymerization was carried out by adding 2.6 g of dispersed S/MWCNT and 0.65 g of aniline hydrochloride to ethanol, and then mixing in a certain amount of ammonium peroxydisulfate dissolved in 0.2 M HCl. The addition of S/MWCNT reduced the polymerization time from 60 to 21 min. The composites were characterized by elemental analysis, FTIR, XRD, SEM, TEM, and electrochemical methods. A 70.0% sulfur, 20.2% emeraldine PANi salt and 9.8% MWCNT composite gave the typical two reduction peaks and two oxidation peaks; these are due to three polysulfide species. The initial discharge capacity was 1334.4 mAh g(-1)-S for the PANi-S/MWCNT electrode and the remaining capacity was 932.4 mAh g(-1)-S after 80 cycles. The columbic efficiency doubled to 92.4% compared to S-MWCNT-2. The rate of the reaction upon using PANi-S/MWCNT electrode was found to be almost twice that of the S/MWCNT composites. Because of the porous polymer, the diffusion distance of the lithium ion from the bulk liquid was reduced. The gel-like cathode composites and the higher conductivities improved the kinetics of the lithium sulfur redox reaction.
引用
收藏
页码:24411 / 24417
页数:7
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