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*

*此作品的通信作者

研究成果: Article同行評審

3 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)22512-22522
頁數11
期刊Journal of Materials Chemistry A
10
發行號42
DOIs
出版狀態Published - 5 10月 2022

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