Open AccessThe application of Cr-MOF@MWCNT modified separator in high-performance lithium-sulfur batteries
Author(s) -
Bingqing Ma
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/619/1/012064
Subject(s) - faraday efficiency , separator (oil production) , sulfur , electrode , chemical engineering , adsorption , materials science , coating , lithium (medication) , electrical conductor , inorganic chemistry , chemistry , nanotechnology , electrochemistry , composite material , organic chemistry , metallurgy , engineering , medicine , physics , endocrinology , thermodynamics
Lithium-sulfur batteries have attracted attention when competing with the next-generation of rechargeable batteries due to their higher theoretical specific capacity, lower cost, and non-toxic and harmless feature. However, there are many obstacles towards the practical application of lithium-sulfur batteries such as low conductivity of the positive electrode and discharge products, the “shuttle effect” of polysulfides, and the unsafety of the lithium negative electrode. In this paper, Cr-MOF@MWCNT as a separator modification layer is introduced into lithium-sulfur batteries to solve the problem of “shuttle effect”. The Cr-MOF in the coating layer can adsorb polysulfides, and the MWCNT tightly combined with Cr-MOF helps to build a good conductive network, so that the adsorbed polysulfides can be converted. As the initial specific capacity and cycle stability of lithium-sulfur batteries with the Cr-MOF@MWCNT separators have been improved, the initial specific capacity is as high as 1377 mAh g −1 at a rate of 0.2 C, while the average capacity attenuation per cycle after 300 cycles is 0.14%, with 99.8% of coulombic efficiency.