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A Full Li–S Battery with Ultralow Excessive Li Enabled via Lithiophilic and Sulfilic W 2 C Modulation
Author(s) -
Wei Benben,
Shang Chaoqun,
Akinoglu Eser Metin,
Wang Xin,
Zhou Guofu
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202002822
Subject(s) - redox , nucleation , battery (electricity) , cathode , materials science , kinetics , chemical engineering , nanotechnology , chemistry , physics , thermodynamics , power (physics) , organic chemistry , quantum mechanics , engineering , metallurgy
The practical application of Li–S batteries demands low cell balance (Li capacity /S capacity ), which involves uniform Li growth, restrained shuttle effect, and fast redox reaction kinetics of S species simultaneously. Herein, with the aid of W 2 C nanocrystals, a freestanding 3D current collector is applied as both Li and S hosts owing to its lithiophilic and sulfilic property. On the one hand, the highly conductive W 2 C can reduce Li nucleation overpotentials, thus guiding uniform Li nucleation and deposition to suppress Li dendrite growth. On the other hand, the polar W 2 C with catalytic effect can enhance the chemisorption affinity to lithium polysulfides (LiPSs) and guarantee fast redox kinetics to restrain S species in cathode region and promote the utilization of S. Surprisingly, a full Li–S battery with ultralow cell balance of 1.5:1 and high sulfur loading of 6.06 mg cm −2 shows obvious redox plateaus of S and maintains high reversible specific capacity of 1020 mAh g −1 (6.2 mAh cm −2 ) after 200 cycles. This work may shed new sights on the facile design of full Li–S battery with low excessive Li supply.