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<p>To achieve high density and high Li-ion conductivity in the garnet LLZO (Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub>), an effective strategy is to dope it with high-valence elements to stabilize the cubic phase and to lower the sintering temperature. As well known, flash sintering (FS) is characterized by short sintering times and low furnace temperature. Herein, the doping modification of Ta-LLZO by flash sintering at 700&#xa0;°C for the higher conductivity of LLZO was investigated in the present study. The results indicate that the addition of an appropriate amount of Ta<sup>5+</sup> can enhance the ionic conductivity. The relative density of the sintered cubic Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub> is 94.72%, with a corresponding total ion conductivity of 9.8 × 10<sup>–4</sup> S cm<sup>−1</sup>, demonstrating good electrical performance. A solid-state lithium metal battery with Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub> electrolyte was assembled, and its electrical performance was tested at 50&#xa0;°C. The results showed that an initial discharge specific capacity of 126.5 mAh g<sup>−1</sup> at a 0.1C rate could be reached.</p>

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Low-temperature flash sintering of dense Ta-doped Li7La3Zr2O12 solid electrolyte for solid-state lithium batteries

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Yue Yang,
  • Zheng Zhang,
  • Tianhui Ma,
  • Shaoting Jia,
  • Chao Huang

摘要

To achieve high density and high Li-ion conductivity in the garnet LLZO (Li7La3Zr2O12), an effective strategy is to dope it with high-valence elements to stabilize the cubic phase and to lower the sintering temperature. As well known, flash sintering (FS) is characterized by short sintering times and low furnace temperature. Herein, the doping modification of Ta-LLZO by flash sintering at 700 °C for the higher conductivity of LLZO was investigated in the present study. The results indicate that the addition of an appropriate amount of Ta5+ can enhance the ionic conductivity. The relative density of the sintered cubic Li6.4La3Zr1.4Ta0.6O12 is 94.72%, with a corresponding total ion conductivity of 9.8 × 10–4 S cm−1, demonstrating good electrical performance. A solid-state lithium metal battery with Li6.4La3Zr1.4Ta0.6O12 electrolyte was assembled, and its electrical performance was tested at 50 °C. The results showed that an initial discharge specific capacity of 126.5 mAh g−1 at a 0.1C rate could be reached.