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A Bio‐Inspired Structurally‐Responsive and Polysulfides‐Mobilizable Carbon/Sulfur Composite as Long‐Cycling Life Li−S Battery Cathode
Author(s) -
Cheng Mengying,
Liu Jinyun,
Zhang Haikuo,
Han Tianli,
Zhang Min,
Cheng Dong,
Zhai Muheng,
Zhou Ping,
Li Jinjin
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900913
Subject(s) - faraday efficiency , sulfur , carbon fibers , materials science , composite number , battery (electricity) , electrochemistry , chemical engineering , cathode , lithium–sulfur battery , nanocomposite , coating , chemistry , nanotechnology , electrode , composite material , metallurgy , power (physics) , physics , quantum mechanics , engineering
High energy density Li−S battery has attracted wide attention because of its promising application in long driving‐range electric vehicles. However, the shuttle effect of polysulfides, electrical insulation and volume‐change of sulfur, remain great challenges. Herein, inspired from a natural mimosa pudica structure, we present a novel nanocomposite which consists of a mimosa pudica‐structured carbon matrix coating with sulfur. The biomimetic configuration is able to structurally‐respond to the volume‐change of sulfur during charge/discharge; and the carbon matrix provides a good conductivity for rapid electron transfer. The carbon/sulfur composite‐based Li−S batteries exhibit a good electrochemical performance including a stable capacity after 1000 cycles, along with a Coulombic efficiency as high as 99.6 %, and an excellent rate‐performance even after three rounds of measurements. In addition, the density function theory modeling is investigated, which confirms the adsorption effect of carbon towards the polysulfides including Li 2 S 4 , Li 2 S 6 , and Li 2 S 8 , enabling a long‐term cycling stability.