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Sulfur Microspheres Encapsulated in Porous Silver‐Based Shell with Superior Performance for Lithium‐Sulfur Batteries
Author(s) -
Mo YuXue,
Jiang YouHong,
Lin JinXia,
Zhou Yao,
Li JunTao,
Wu QiHui,
Huang Ling,
Liao HongGang,
Sun ShiGang
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800337
Subject(s) - polysulfide , electrochemistry , sulfur , dissolution , materials science , porosity , cathode , chemical engineering , lithium (medication) , composite number , plating (geology) , shell (structure) , lithium–sulfur battery , composite material , electrode , metallurgy , electrolyte , chemistry , medicine , geophysics , geology , engineering , endocrinology
The lithium‐sulfur system is considered as one of the next‐generation batteries owing to its low‐cost and high theoretical energy density. However, the poor conductivity of sulfur, undesirable dissolution, and shuttling of lithium polysulfides are still main challenges for a practical application. Herein, a chemical plating method was developed to encapsulate sulfur microspheres within a porous Ag‐based thin shell of ca. 67 nm in thickness (denoted as S@Ag microcomposites). The sulfur content in the S@Ag particles is 89 wt%. With such structural and compositional merits, the core‐shell composites can effectively facilitate the electron transfer and alleviate the polysulfide dissolution. When utilized as cathode in Li−S batteries, the S@Ag microcomposites exhibit good electrochemical performance, featured by an initial charge capacity of 1231 mAh g −1 and a capacity of 922 mAh g −1 after 100 cycles at 0.2 C. The electrochemical performance of commercial S particles was also improved after treated by this chemical plating method. This study provides a simple and novel approach to fabricate S composite cathodes with high S content and promising electrochemical properties.