期刊
MATERIALS TRANSACTIONS
卷 57, 期 9, 页码 1639-1644出版社
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.MAW201601
关键词
complex hydrides; cluster anion; bulk-type all-solid-state batteries; fast lithium ionic conductors; solid-state electrolytes
资金
- Target Project 4 of WPI-AIMR, Tohoku University
- Collaborative Research Center on Energy Materials, Tohoku University
- JSPS [25220911]
- Advanced Low Carbon Technology Research and Development Program (ALCA) from the Japan Science and Technology Agency (JST)
In this study, we incorporated fast lithium ion conducting complex hydrides containing cluster anions, namely icosahedral dodecahydro-closo-dodecaborate anions, [B12H12](2-), into a bulk-type all-solid-state battery. Li2B12H12, TiS2 and Li were used as an electrolyte, a positive electrode active material and a negative electrolyte, respectively, for a battery assembly to investigate its battery performance. Bulk-type battery contains high quantity of electrode active materials in the electrode layer, and thereby the enhanced energy-storage density is expected. In addition, nonflammable solid-state electrolyte would ensure the safety, which is currently problematic for the conventional lithium rechargeable battery that uses organic liquid electrolyte. Li2B12H12 has a high lithium ionic conductivity of log(sigma/S cm(-1))= -2.6 at 393 K. It exhibits a relatively higher conductivity of log(sigma/S cm(-1)) = -3.5 at reduced temperatures such as 333 K. These high lithium ionic conductivity allows for the repeated operation of the bulk-type all-solid-state TiS2/Li battery for at least 10 cycles at not only 393 K but also 333 K with the discharge capacities higher than 190 mAh g(-1). Li2B12H12 exhibits higher oxidative stability. Thus, our battery realized high coulombic efficiencies of over 92% during the battery operation. This information will be beneficial for the further development of novel complex hydride-based electrolyte to have high-performance bulk-type all-solid-state batteries.
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