期刊
JOURNAL OF POWER SOURCES
卷 376, 期 -, 页码 131-137出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.11.061
关键词
Li-S battery; Graphene; Graphite mineral; Cathode; Cyclability
资金
- National Natural Science Foundation of China [21503259, 51502320, 21373255, U1662102]
- Chinese Academy of Sciences [2015YCR001]
Lithium-sulfur battery receives intense attention owing to its high theoretical energy density. However, poor electrical conductivity of sulfur and poor cycle stability of the battery hinder its application. Here, we report that graphene microsheets prepared from microcrystalline graphite minerals by an electrochemical & mechanical approach work as a special conductive support to load sulfur as the cathode of lithium-sulfur battery. The graphene microsheets have the features of excellent conductivity and low defect, small sheet sizes of < 1 mu m(2) and <= 6 atomic layers as well as natural silicate residue covered. Li-S batteries of graphene microsheets/S as cathode exhibit long-term cyclability and high coulombic efficiency. At 1 C for 2000 cycles, average coulombic efficiency of 99.7% is reached.
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