Tape-cast Ce-substituted Li7La3Zr2O12 electrolyte for improving electrochemical performance of solid-state lithium batteries

Purna Chandra Rath, Yu Syuan Jheng, Cheng Chia Chen, Chih Long Tsai, Yu Sheng Su, Chun Chen Yang, Rüdiger A. Eichel, Chien Te Hsieh, Tai Chou Lee, Jeng Kuei Chang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Solid-state lithium-metal batteries (SSLMBs) with a composite solid electrolyte (CSE) have great potential for achieving both high energy density and high safety and are thus promising next-generation energy storage devices. The current bottlenecks are a high electrode/electrolyte interface resistance and the limited Li+ conductivity of the solid electrolyte layer. To reduce the interface resistance, a tape casting method is used to directly deposit a CSE layer (∼20 μm) onto a model LiFePO4 cathode. The CSE slurry infiltrates the cathode layer, forming a Li+ conduction network and ensuring intimate contact between the CSE and the cathode. The tape casting parameters, such as the polymer/Li salt ratio, inorganic filler fraction, and casting thickness, for the CSE layer are investigated. To increase Li+ conductivity, Ce substitution is conducted for Li7La3Zr2−xCexO12, x = 0-0.15. The effects of Ce content on the specific capacity, rate capability, and cycling stability of Li//CSE//LiFePO4 cells are systematically studied. Li7La3Zr1.9Ce0.1O12 (i.e., x = 0.1) is found to be the optimal composition; it outperforms Li7La3Zr2O12 and Li6.25Ga0.25La3Zr2O12 in terms of CSE conductivity and SSLMB charge-discharge performance.

Original languageEnglish
Pages (from-to)22512-22522
Number of pages11
JournalJournal of Materials Chemistry A
Volume10
Issue number42
DOIs
StatePublished - 5 Oct 2022

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