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Dense‐Stacking Porous Conjugated Polymer as Reactive‐Type Host for High‐Performance Lithium Sulfur Batteries
Author(s) -
Wang Xiaowei,
Yang Yangyuchen,
Lai Chen,
Li Runlai,
Xu Haomin,
Tan Darren H. S.,
Zhang Kun,
Yu Wei,
Fjeldberg Oeystein,
Lin Ming,
Tang Wei,
Meng Ying Shirley,
Loh Kian Ping
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202016240
Subject(s) - cathode , electrolyte , porosity , polymer , chemical engineering , sulfur , materials science , redox , kinetics , lithium (medication) , chemistry , electrode , inorganic chemistry , composite material , organic chemistry , medicine , physics , quantum mechanics , engineering , endocrinology
Commercialization of the lithium‐sulfur battery is hampered by bottlenecks like low sulfur loading, high cathode porosity, uncontrollable Li 2 S x deposition and sluggish kinetics of Li 2 S activation. Herein, we developed a densely stacked redox‐active hexaazatrinaphthylene (HATN) polymer with a surface area of 302 m 2 g −1 and a very high bulk density of ca. 1.60 g cm −3 . Uniquely, HATN polymer has a similar redox potential window to S, which facilitates the binding of Li 2 S x and its transformation chemistry within the bulky polymer host, leading to fast Li 2 S/S kinetics. The compact polymer/S electrode presents a high sulfur loading of ca. 15 mg s cm −2 (200‐μm thickness) with a low cathode porosity of 41 %. It delivers a high areal capacity of ca. 14 mAh cm −2 and good cycling stability (200 cycles) at electrolyte–sulfur (E/S) ratio of 5 μL mg s −1 . The assembled pouch cell delivers a cell‐level high energy density of 303 Wh kg −1 and 392 Wh L −1 .