Open AccessDesign and Construction of Sodium Polysulfides Defense System for Room‐Temperature Na–S Battery
Author(s) -
Yang Tingting,
Guo Bingshu,
Du Wenyan,
Aslam Muhammad Kashif,
Tao Mengli,
Zhong Wei,
Chen Yuming,
Bao ShuJuan,
Zhang Xuan,
Xu Maowen
Publication year - 2019
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201901557
Subject(s) - separator (oil production) , electrolyte , anode , cathode , chemical engineering , composite number , materials science , adsorption , polysulfide , sodium , battery (electricity) , composite material , chemistry , electrode , metallurgy , organic chemistry , power (physics) , physics , quantum mechanics , engineering , thermodynamics
Room‐temperature Na–S batteries are facing one of the most serious challenges of charge/discharge with long cycling stability due to the severe shuttle effect and volume expansion. Herein, a sodium polysulfides defense system is presented by designing and constructing the cathode‐separator double barriers. In this strategy, the hollow carbon spheres are decorated with MoS 2 (HCS/MoS 2 ) as the S carrier (S@HCS/MoS 2 ). Meanwhile, the HCS/MoS 2 composite is uniformly coated on the surface of the glass fiber as the separator. During the discharge process, the MoS 2 can adsorb soluble polysulfides (NaPSs) intermediates and the hollow carbon spheres can improve the conductivity of S as well as act as the reservoir for electrolyte and NaPSs, inhibiting them from entering the anode to make Na deteriorate. As a result, the cathode‐separator group applied to room‐temperature Na–S battery can enable a capacity of ≈1309 mAh g −1 at 0.1 C and long cycling life up to 1000 cycles at 1 C. This study provides a novel and effective way to develop durable room‐temperature Na–S batteries.