Highly efficient and stable cryo-ground sulphur cathode for Li-S batteries

JOURNAL OF POWER SOURCES

卷:331

Article

Kazda, T.¹  Krbal, M.²  Pouzar, M.^2,3  Vondrak, J.¹  Strakova, A. Fedorkova⁴  Slavik, M.⁵  Wagner, T.^2,6  Macak, J. M.² 

[1] Brno Univ Technol, Fac Elect Engn & Commun, Dept Elect & Elect Technol, Tech 10, Brno 61600, Czech Republic

[2] Univ Pardubice, Fac Chem Technol, Ctr Mat & Nanotechnol CEMNAT, Cs Legii 565, Pardubice 53002, Czech Republic

[3] Univ Pardubice, Inst Environm & Chem Engn, Fac Chem Technol, Studentska 573, Pardubice 53210, Czech Republic

[4] PJ Safarik Univ Kosice, Dept Phys Chem, Fac Sci, Moyzesova 11, SK-04154 Kosice, Slovakia

[5] SINTEF, Graphene Batteries AS, Forskningsveien 1, N-0314 Oslo, Norway

[6] Univ Pardubice, Fac Chem Technol, Dept Gen & Inorgan Chem, Studentska 573, Pardubice 53210, Czech Republic

关键词: Lithium-sulphur battery;    Sulphur cathode;    Cryogenic grinding;    Li-ion batteries;   

DOI  :  10.1016/j.jpowsour.2016.09.050

来源: Elsevier

【 摘 要 】

Here we report on a Li-S battery with cathode, based on a S powder obtained from bulk amorphous S, by cryogenic grinding. The cathode was prepared from a slurry, wherein the content of cryo-ground S powder was equal to 80 wt % (corresponds to approximate to 2.26 mg cm(-2)). Other slurry components included carbon Super P, and polyvinylidene fluoride, dispersed in N-methylpyrrolidone. The electrochemical performance of the as-prepared battery was compared to a battery based on an identically prepared paste, but containing reference S powder (with the orthorhombic structure). A longer life cycle, and enhanced capacity per gram, as well as per cm(2) of electrode was revealed for the cryo-ground S-based cathode. The electrochemical results show that the loss in capacity of the cryo-ground S powder cathode was just 3% after 50 cycles, which suggests on a higher stability of S inside the cathode during cycling. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free