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Title: Synthesis of rock-salt type lithium borohydride and its peculiar Li{sup +} ion conduction properties

The high energy density and excellent cycle performance of lithium ion batteries makes them superior to all other secondary batteries and explains why they are widely used in portable devices. However, because organic liquid electrolytes have a higher operating voltage than aqueous solution, they are used in lithium ion batteries. This comes with the risk of fire due to their flammability. Solid electrolytes are being investigated to find an alternative to organic liquid. However, the nature of the solid-solid point contact at the interface between the electrolyte and electrode or between the electrolyte grains is such that high power density has proven difficult to attain. We develop a new method for the fabrication of a solid electrolyte using LiBH{sub 4,} known for its super Li{sup +} ion conduction without any grain boundary contribution. The modifications to the conduction pathway achieved by stabilizing the high pressure form of this material provided a new structure with some LiBH{sub 4}, more suitable to the high rate condition. We synthesized the H.P. form of LiBH{sub 4} under ambient pressure by doping LiBH{sub 4} with the KI lattice by sintering. The formation of a KI - LiBH{sub 4} solid solution was confirmed both macroscopically andmore » microscopically. The obtained sample was shown to be a pure Li{sup +} conductor despite its small Li{sup +} content. This conduction mechanism, where the light doping cation played a major role in ion conduction, was termed the “Parasitic Conduction Mechanism.” This mechanism made it possible to synthesize a new ion conductor and is expected to have enormous potential in the search for new battery materials.« less
Authors:
; ;  [1]
  1. Department of Materials Science, Graduate School of Engineering, Tohoku University Aramaki Aoba 6-6-11-301-2-2, Sendai, Miyagi 980-8579 (Japan)
Publication Date:
OSTI Identifier:
22269158
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 2; Journal Issue: 5; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; AQUEOUS SOLUTIONS; CATIONS; ELECTRIC BATTERIES; ELECTRIC POTENTIAL; ENERGY DENSITY; FLAMMABILITY; GRAIN BOUNDARIES; INDIUM IONS; LITHIUM; LITHIUM IONS; POTASSIUM IODIDES; POWER DENSITY; SALT DEPOSITS; SINTERING; SOLID ELECTROLYTES; SOLID SOLUTIONS; SOLIDS; SYNTHESIS