Journal
ADVANCED SCIENCE
Volume 8, Issue 7, Pages -Publisher
WILEY
DOI: 10.1002/advs.202003400
Keywords
hollow polyhedrons; layered double hydroxides; lithium-sulfur batteries; nano-micro hierarchies; spray drying
Categories
Funding
- Program for the Outstanding Young Talents of Hebei Province, China
- Natural Science Foundation of Hebei Province of China [B2020202052, B2019202277]
- Chunhui Project of Ministry of Education of the People's Republic of China [Z2017010]
- Guangdong Innovative and Entrepreneurial Team Program [2016ZT06C517]
- Science and Technology Program of Guangzhou [2019050001]
- Science and Technology Program of Zhaoqing [2019K038]
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology,China [EERI_PI2020007]
- Natural Sciences and Engineering Research Council of Canada
- University of Waterloo
- Waterloo Institute for Nanotechnology
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In this study, a unique bimetallic NiCo-layered double hydroxide was developed as an advanced sulfur reservoir for lithium-sulfur batteries, replacing the traditional monometallic Co-LDH. The bimetallic configuration improved the electrode structure and chemical interactions, leading to enhanced cycling performance and rate capability of Li-S cells.
Rational construction of sulfur electrodes is essential in pursuit of practically viable lithium-sulfur (Li-S) batteries. Herein, bimetallic NiCo-layered double hydroxide (NiCo-LDH) with a unique hierarchical micro-nano architecture is developed as an advanced sulfur reservoir for Li-S batteries. Compared with the monometallic Co-layered double hydroxide (Co-LDH) counterpart, the bimetallic configuration realizes much enriched, miniaturized, and vertically aligned LDH nanosheets assembled in hollow polyhedral nanoarchitecture, which geometrically benefits the interface exposure for host-guest interactions. Beyond that, the introduction of secondary metal intensifies the chemical interactions between layered double hydroxide (LDH) and sulfur species, which implements strong sulfur immobilization and catalyzation for rapid and durable sulfur electrochemistry. Furthermore, the favorable NiCo-LDH is architecturally upgraded into closely packed micro-nano clusters with facilitated long-range electron/ion conduction and robust structural integrity. Due to these attributes, the corresponding Li-S cells realize excellent cyclability over 800 cycles with a minimum capacity fading of 0.04% per cycle and good rate capability up to 2 C. Moreover, highly reversible areal capacity of 4.3 mAh cm(-2) can be achieved under a raised sulfur loading of 5.5 mg cm(-2). This work provides not only an effective architectural design but also a deepened understanding on bimetallic LDH sulfur reservoir for high-performance Li-S batteries.
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