Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 7, Pages 9485-9491Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.12.209
Keywords
Iron sulfide; Mesocarbon microbeads; lithium-ion batteries; Anode composite material
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Funding
- National Key R&D Program of China [2017YFB0603105]
- Recruitment of Outstanding Technologist of Chinese Academy of Sciences
- Zhengzhou High Level Talent [20180300045]
- National Natural Science Foundation of China (Youth Science Foundation Program) [21908206]
- Key Research Program of Chinese Academy of Science [ZDRW-ZS-2018-1-3]
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Iron sulfide is considered as a promising anode material for lithium ion batteries because of its high theoretical capacity, low price and non-toxicity. Unfortunately, the inherent disadvantages of iron sulfide limit its practical application, such as, low electrical conductivity, volume expansion and polysulfide dissolution during charge and discharge. Herein, a hierarchical carbon-coated Fe1-xS/mesocarbon microbeads (Fe1-xS@C/MCMB) composite with excellent cycle stability and high-rate performance was synthesized by a facile one-step in situ thermal condensation method. In this composite, the MCMB core and the external amorphous carbon provide a buffer matrix and construct a three-dimensional conducive network around the Fe1-xS nanoparticles. In addition, amorphous carbon can also act as a protective film to increase the bonding strength between MCMB and Fe1-xS nanoparticles, and inhibit the shuttle effect of polysulfide. The Fe1-xS@C/MCMB composite as lithium-ion batteries anode material exhibited excellent cycle stability (capacity retention: 531.7 mAh g at 200 mA g(-1) over 120 cycles) and high-rate performance (with a reversible capacity of 253 mAh g(-1) even at 2 A g(-1)). The design of the novel structure is expected to promote the development of commercial metal sulfide-based anode materials with impressive cycle stability.
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