Effect of Li<sub>3</sub>BO<sub>3</sub> addition to NASICON-type single-phase all-solid-state lithium battery based on Li<sub>1.5</sub>Cr<sub>0.5</sub>Ti<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub>

Akira Nishio, Atsushi Inoishi, Ayuko Kitajou, Shigeto Okada

Research output: Contribution to journalArticle

Abstract

<p>All-solid-state Li-ion battery is expected as the post Li-ion battery because of its high reliability and safety. However, the biggest issue for the all-solid-state Li-ion battery is the interfacial resistance between electrode and electrolyte rather than the bulk ionic conductivity of the solid electrolyte. In order to reduce the interfacial resistance, we recently adopted a new concept, "single-phase all-solid-state battery", which is made of a single material. In principle, single-phase all-solid-state battery has low interfacial resistance between the solid electrolyte and electrodes, because the solid electrolyte and electrodes are same material. Here, the electrochemical properties of single-phase all-solid-state battery based on Li<sub>1.5</sub>Cr<sub>0.5</sub>Ti<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> and the effect of Li<sub>3</sub>BO<sub>3</sub> additive as flux to Li<sub>1.5</sub>Cr<sub>0.5</sub>Ti<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> are shown. The pellet of Li<sub>1.5</sub>Cr<sub>0.5</sub>Ti<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> with Li<sub>3</sub>BO<sub>3</sub> additive showed higher density by filling the voids of Li<sub>1.5</sub>Cr<sub>0.5</sub>Ti<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub>. As the result of the low electronic conductivity of Li<sub>3</sub>BO<sub>3</sub>, the overpotential was increased. However, the electron leakage was suppressed. On the other hand, the operation voltage and the reversible capacity were improved due to the high lithium-ionic conductivity of Li<sub>3</sub>BO<sub>3</sub>. It was found that Li<sub>3</sub>BO<sub>3</sub> additive is useful for the improvement of the single-phase battery.</p>
Original languageEnglish
Pages (from-to)18-21
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume127
Issue number1
DOIs
Publication statusPublished - 2019

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