The natural critical current density limit for Li7La3Zr2O12garnets

Florian Flatscher, Martin Philipp, Steffen Ganschow, H. Martin R. Wilkening, Daniel Rettenwander*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Ceramic batteries equipped with Li-metal anodes are expected to double the energy density of conventional Li-ion batteries. Besides high energy densities, also high power is needed when batteries have to be developed for electric vehicles. Practically speaking, so-called critical current densities (CCD) higher than 3 mA cm-2 are needed to realize such systems. As yet, this value has, however, not been achieved for garnet-type Li7La3Zr2O12 (LLZO) being one of the most promising ceramic electrolytes. Most likely, CCD values are influenced by the area specific resistance (ASR) governing ionic transport across the Li|electrolyte interface. Here, single crystals of LLZO with adjusted ASR are used to quantify this relationship in a systematic manner. It turned out that CCD values exponentially decrease with increasing ASR. The highest obtained CCD value was as high as 280 μA cm-2. This value should be regarded as the room-temperature limit for LLZO when no external pressure is applied. Concluding, for polycrystalline samples either stack pressure or a significant increase of the interfacial area is needed to reach current densities equal or higher than the above-mentioned target value. This journal is

Original languageEnglish
Pages (from-to)15782-15788
Number of pages7
JournalJournal of Materials Chemistry A
Volume8
Issue number31
DOIs
Publication statusPublished - 21 Aug 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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