4.8 Article

Fluorinated Graphite (FG)-Modified Li-S Batteries with Superhigh Primary Specific Capacity and Improved Cycle Stability

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 44, 页码 52717-52726

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c16978

关键词

lithium-sulfur batteries; fluorinated graphite; cathode material; porosity electrode; ion transport

资金

  1. National Natural Science Foundation of China [51673199, 51677176]
  2. Youth Innovation Promotion Association of CAS [2015148]
  3. Innovation Foundation of DICP [ZZBS201615, ZZBS201708]
  4. Dalian Science and Technology Star Program [2016RQ026]
  5. National Key Research and Development Project [2019YFA0705600]

向作者/读者索取更多资源

In this study, fluorinated graphite (FG) was introduced to the cathode of lithium-sulfur (Li-S) batteries to alleviate issues related to low sulfur utilization and the shuttle effect of polysulfide. The results showed that the FG improved the initial specific capacity and cycle stability of the batteries by enhancing cathode porosity and polarity, leading to increased electrolyte infiltration and polysulfide adsorption. This new strategy may help improve the energy density and cycle stability of Li-S batteries.
Lithium-sulfur (Li-S) batteries have received extensive attention because of their high theoretical energy density and low cost. However, the low sulfur utilization and the shuttle effect of polysulfide cause low initial capacity and serious capacity decay. Herein, fluorinated graphite (FG) is introduced to the cathode to alleviate these issues. The results indicated that the FG could provide additional capacity during the first discharge process and increase the porosity and polarity of the cathode via in situ formation of lithium fluoride (LiF) nanocrystals, which can enhance the infiltration of electrolyte and polysulfide adsorption. As a result, the as-prepared cathode containing FG shows a high initial specific capacity of 1602 mA h g(-1) and the reversible specific capacity is 650 mA h g(-1) at 0.5C after 300 cycles. Moreover, its specific capacity remains at 860 mA h g(-1) at 5C, which is 367% higher than that of the sample without FG. This paper provides a new strategy to improve the energy density and the cycle stability of Li-S batteries.

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