Journal
ACS NANO
Volume 13, Issue 4, Pages 3982-3991Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b07843
Keywords
catalytic Co3S4; hierarchical carbon electrode; high-rate performance; Li-S battery; ZIF-67
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Funding
- National Key R&D Program of China [2016YFE0127300, 2017YFA0206701]
- Natural Science Foundation of China [NSFC 51672005]
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Lithium-sulfur (Li-S) batteries are next generation energy storage systems with high energy density, and the rate performance is a very important consideration for practical applications. Recent approaches such as introducing catalytic materials to facilitate polysulfide conversion have been explored, yet the results remain unsatisfactory. Here, we present an optimized Li-S electrode featured by a large amount of highly dispersed Co3S4 nanoparticles (similar to 10 nm in size) throughout a hierarchical carbon nanostructure hybridized from ZIF-67 and carbon nanotube (CNT) sponge. This enables homogeneous distribution and close contact between infiltrated sulfur and Co3S4 nanoparticles within the ZIF-67-derived N-doped carbon nanocubes, leading to effective chemical interaction with polysulfides, maximum catalytic effect and enhanced lithium ion diffusion, while the built-in three-dimensional CNT network ensures high electrical conductivity of the electrode. As a consequence, the Li-S battery exhibits both extraordinary rate performance by maintaining a capacity of similar to 850 mAh g(-1) at very high charge/discharge rate (5 C) and long-term cycling stability with 85% retention after 1000 cycles at 5 C (an average capacity fading rate of only 0.0137% per cycle).
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