Impact of Li<sub>3</sub>BO<sub>3</sub> Addition on Solid Electrode-Solid Electrolyte Interface in All-Solid-State Batteries
All-solid-state lithium-ion batteries raise the issue of high resistance at the interface between solid electrolyte and electrode materials that needs to be addressed. The article investigates the effect of a low-melting Li<sub>3</sub>BO<sub>3</sub> additive introduced into L...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/98f6d6118ccb4a59900bafdab813b501 |
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| Sumario: | All-solid-state lithium-ion batteries raise the issue of high resistance at the interface between solid electrolyte and electrode materials that needs to be addressed. The article investigates the effect of a low-melting Li<sub>3</sub>BO<sub>3</sub> additive introduced into LiCoO<sub>2</sub>- and Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>-based composite electrodes on the interface resistance with a Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> solid electrolyte. According to DSC analysis, interaction in the studied mixtures with Li<sub>3</sub>BO<sub>3</sub> begins at 768 and 725 °C for LiCoO<sub>2</sub> and Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>, respectively. The resistance of half-cells with different contents of Li<sub>3</sub>BO<sub>3</sub> additive after heating at 700 and 720 °C was studied by impedance spectroscopy in the temperature range of 25–340 °C. It was established that the introduction of 5 wt% Li<sub>3</sub>BO<sub>3</sub> into LiCoO<sub>2</sub> and heat treatment at 720 °C led to the greatest decrease in the interface resistance from 260 to 40 Ω cm<sup>2</sup> at 300 °C in comparison with pure LiCoO<sub>2</sub>. An SEM study demonstrated that the addition of the low-melting component to electrode mass gave better contact with ceramics. It was shown that an increase in the annealing temperature of unmodified cells with Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> led to a decrease in the interface resistance. It was found that the interface resistance between composite anodes and solid electrolyte had lower values compared to Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>|Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> half-cells. It was established that the resistance of cells with the Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>/Li<sub>3</sub>BO<sub>3</sub> composite anode annealed at 720 °C decreased from 97.2 (<i>x</i> = 0) to 7.0 kΩ cm<sup>2</sup> (<i>x</i> = 5 wt% Li<sub>3</sub>BO<sub>3</sub>) at 150 °C. |
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