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Synergistic Engineering of Defects and Architecture in Binary Metal Chalcogenide toward Fast and Reliable Lithium–Sulfur Batteries
Author(s) -
Luo Dan,
Li Gaoran,
Deng YaPing,
Zhang Zhen,
Li Jingde,
Liang Ruilin,
Li Matthew,
Jiang Yi,
Zhang Weiwei,
Liu Yangshuai,
Lei Wen,
Yu Aiping,
Chen Zhongwei
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201900228
Subject(s) - polysulfide , materials science , sulfur , spinel , rational design , electrochemistry , lithium (medication) , energy storage , chemical engineering , battery (electricity) , chalcogenide , nickel , electrode , nanotechnology , chemistry , metallurgy , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering , electrolyte
Lithium–sulfur (Li–S) batteries have great promise to support the next‐generation energy storage if their sluggish redox kinetics and polysulfide shuttling can be addressed. The rational design of sulfur electrodes plays key roles in tacking these problems and achieving high‐efficiency sulfur electrochemistry. Herein, a synergetic defect and architecture engineering strategy to design highly disordered spinel Ni–Co oxide double‐shelled microspheres (NCO‐HS), which consist of defective spinel NiCo 2 O 4– x ( x = 0.9 if all nickel is Ni 2+ and cobalt is Co 2.13+ ), as the multifunctional sulfur host material is reported. The in situ constructed cation and anion defects endow the NCO‐HS with significantly enhanced electronic conductivity and superior polysulfide adsorbability. Meanwhile, the delicate nanoconstruction offers abundant active interfaces and reduced ion diffusion pathways for efficient Li–S chemistry. Attributed to these synergistic features, the sulfur composite electrode achieves excellent rate performance up to 5 C, remarkable cycling stability over 800 cycles and good areal capacity of 6.3 mAh cm −2 under high sulfur loading. This proposed strategy based on synergy engineering could also inform material engineering in related energy storage and conversion fields.