Premium
Graphene‐Modified Mesoporous Iron Phosphate as Superior Binary Sulfur Host for Lithium–Sulfur Batteries
Author(s) -
Jin Fan,
Wang Bo,
Ning Yu,
Zhang Zekun,
Yang Jing,
Zhang Han,
Wang Dianlong,
Zhou Yu
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201901462
Subject(s) - mesoporous material , sulfur , cathode , graphene , materials science , electrochemistry , chemical engineering , adsorption , lithium (medication) , conductivity , amorphous solid , nanotechnology , inorganic chemistry , chemistry , electrode , catalysis , organic chemistry , metallurgy , medicine , endocrinology , engineering
Lithium–sulfur batteries (LSB) are considered to have great research value and application prospects in the future due to their high theoretical energy density, inexpensive characteristics, and environmental friendliness. However, the poor electronic conductivity, large volume change, and shuttle effect of the sulfur cathode seriously hinder the commercial application of LSBs. Herein, a graphene‐modified mesoporous amorphous FePO 4 (G/FP) binary host is synthesized using a mild one‐step hydrothermal method. The FePO 4 (FP) component with strong polarity plays a crucial role in chemical adsorption and conversion of polysulfides, thus inhibiting the shuttle effect during the cycle process. The graphene (G) framework ensures the electronic conductivity and physically adsorbs polysulfides to improve the utilization of active sulfur. The reasonable porous structure of the G/FP matrix guarantees fast Li + transport and more electrochemical reactive sites, thereby enabling the excellent electrochemical performance of the G/FP/S cathode. The prepared G/FP/S cathode with a high initial discharge specific capacity of 1469.5 mAh g −1 delivers a stable capacity of 840.7 mAh g −1 at 0.2 C after 300 cycles and 656.7 mAh g −1 at 1.0 C after 800 cycles as well as an excellent rate performance (651.8 mAh g −1 at 5.0 C) at a relatively large sulfur loading of 3.1 mg cm −2 .