A sulphide lithium super ion conductor is superior to liquid ion conductors for use in rechargeable batteries

We report that a heat-treated Li2S–P2S5 glass-ceramic conductor has an extremely high ionic conductivity of 1.7 × 10−2 S cm−1 and the lowest conduction activation energy of 17 kJ mol−1 at room temperature among lithium-ion conductors reported to date. The optimum conditions of the heat treatment reduce the grain boundary resistance, and the influence of voids, to increase the Li+ ionic conductivity of the solid electrolyte so that it is greater than the conductivities of liquid electrolytes, when the transport number of lithium ions in the inorganic electrolyte is unity.

[1]  Yuki Kato,et al.  A lithium superionic conductor. , 2011, Nature materials.

[2]  Masahiro Tatsumisago,et al.  Structure and properties of Li2S–P2S5–P2S3 glass and glass–ceramic electrolytes , 2009 .

[3]  S. Adams,et al.  Crystal structure of a superionic conductor, Li7P3S11 , 2007 .

[4]  M. Osada,et al.  Synthesis of phosphorous sulfide solid electrolyte and all-solid-state lithium batteries with graphite electrode , 2005 .

[5]  K. Tadanaga,et al.  New, Highly Ion‐Conductive Crystals Precipitated from Li2S–P2S5 Glasses , 2005 .

[6]  T. Minami,et al.  Preparation of Li2S–P2S5 Amorphous Solid Electrolytes by Mechanical Milling , 2004 .

[7]  S. Kondo,et al.  Solid-state lithium battery with graphite anode , 2003 .

[8]  Ryoji Kanno,et al.  Lithium Ionic Conductor Thio-LISICON: The Li2 S ­ GeS2 ­ P 2 S 5 System , 2001 .

[9]  Y. Aihara,et al.  Pulse-Gradient Spin-Echo (1)H, (7)Li, and (19)F NMR Diffusion and Ionic Conductivity Measurements of 14 Organic Electrolytes Containing LiN(SO2CF3)2. , 1999, The journal of physical chemistry. B.

[10]  V. Koch,et al.  Conductance of Solutions of Lithium tris(trifluoromethanesulfonyl) Methide in Water, Acetonitrile, Propylene Carbonate, N,N‐Dimethylformamide, and Nitromethane at 25°C , 1996 .

[11]  Bruno Scrosati,et al.  Challenge of portable power , 1995, Nature.

[12]  Liquan Chen,et al.  Candidate compounds with perovskite structure for high lithium ionic conductivity , 1994 .

[13]  Y. Sadaoka,et al.  Electrical property and sinterability of LiTi2(PO4)3 mixed with lithium salt (Li3PO4 or Li3BO3) , 1991 .

[14]  Y. Sadaoka,et al.  Ionic conductivity and sinterability of lithium titanium phosphate system , 1990 .

[15]  J. Kennedy.  Ionically conductive glasses based on SiS2 , 1989 .

[16]  Annie Pradel,et al.  Electrical properties of lithium conductive silicon sulfide glasses prepared by twin roller quenching , 1986 .

[17]  G. Robert,et al.  Superionic conduction in Li2S - P2S5 - LiI - glasses , 1981 .