10:40 AM - 11:00 AM
[KJS2] Ionic Conduction in Metal Borohydrides and Their Application to All-Solid-State Secondary Batteries
Keywords:Ionic conductor、All-solid-state batteries、Metal borohydrides、NMR
Metal borohydrides such as LiBH4 are widely used as a reducing agent in the synthesis of organic chemistry and a hydrogen storage medium. Meanwhile, ionic conduction as a new function of the metal borohydrides has been the focus of much attention since a high lithium ion conductivity of approximately 10-3 S/cm for LiBH4 was reported in 2007. To date, many metal borohydride-based ionic conductors such as Li3K3La2(BH4)12 and Na2B12H12 have been reported.
In this presentation, the recent progress of metal borohydrides as an ionic conductor will be overviewed. From a scientific point of view, the role of giant anions such as [BH4]- and [B12H12]2- on the ion transport phenomena of counter cations such as Li+ and Na+ is then discussed. Nuclear magnetic resonance (NMR) plays an important role to clarify the dynamics of ions in the metal borohydrides. Meanwhile, from an engineering point of view, the advantages of the metal borohydrides as a solid electrolyte for secondary batteries follow: 1) good chemical compatibility with metallic anode such as Li, 2) good formability, 3) negligible grain boundary resistance, and 4) light weight. Because of its nature as a strong reducing agent, however, it comes with the risk of decomposing by reacting with oxidative cathode materials such as LiCoO2. The solution would be to use an intermediate layer in between the solid electrolyte and the cathode. In this presentation, the current status of all-solid-state batteries with the metal-borohydrides-based solid electrolyte is introduced, especially focusing on the effect of the intermediate layer. The tasks and future prospect for metal borohydride-based ionic conductors will be also discussed.
In this presentation, the recent progress of metal borohydrides as an ionic conductor will be overviewed. From a scientific point of view, the role of giant anions such as [BH4]- and [B12H12]2- on the ion transport phenomena of counter cations such as Li+ and Na+ is then discussed. Nuclear magnetic resonance (NMR) plays an important role to clarify the dynamics of ions in the metal borohydrides. Meanwhile, from an engineering point of view, the advantages of the metal borohydrides as a solid electrolyte for secondary batteries follow: 1) good chemical compatibility with metallic anode such as Li, 2) good formability, 3) negligible grain boundary resistance, and 4) light weight. Because of its nature as a strong reducing agent, however, it comes with the risk of decomposing by reacting with oxidative cathode materials such as LiCoO2. The solution would be to use an intermediate layer in between the solid electrolyte and the cathode. In this presentation, the current status of all-solid-state batteries with the metal-borohydrides-based solid electrolyte is introduced, especially focusing on the effect of the intermediate layer. The tasks and future prospect for metal borohydride-based ionic conductors will be also discussed.
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