All-solid-state half-cell of Li/a-Si film using guest Li+ conductor 15NaI?LiBH4 as a solid electrolyte
All-solid-state half-cell of Li/a-Si film using guest Li+ conductor 15NaI?LiBH4 as a solid electrolyte
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以客体锂导体15NaI?LiBH4为固体电解质的Li/a-Si薄膜全固态半电池
DOI：
10.1007/s10008-020-04662-7
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发表时间：
2020
影响因子：
2.5
通讯作者：
Hihara Takehiko
中科院分区：
文献类型：
--
作者：
Miyazaki Reona;Hihara Takehiko
在本研究中，使用客体Li+离子导体（15 NaI·LiBH 4）作为固体电解质制备了全固态Li/非晶硅（a-Si）半电池。证实了a-Si膜的连续锂化/脱锂。在室温下，充放电循环稳定超过80次，库仑效率高达99%。另一方面，差的倍率性能是问题;容量在12.7 μA/cm 2下保持在约1300 mAh/g。在60 °C下加热电池导致倍率性能的改善，这可能是由于15 NaI·LiBH 4的Li+电导率的改善。为了了解15 NaI·LiBH 4的微观结构与Li+电导率之间的相关性，对球磨样品进行后退火，并通过透射电子显微镜（TEM）观察微观结构的变化。结果表明，晶格缺陷，如位错和晶格畸变，有显着的贡献的Li+离子导电性的15 NaI的LiBH 4。
In the present study, an all-solid-state half-cell Li/ amorphous Si (a-Si) was fabricated using the guest Li+ion conductor (15NaI∙LiBH4) as a solid electrolyte. Continuous lithiation/delithiation of thea-Si film was confirmed. At room temperature, the charge-discharge cycles were stable over 80 cycles with the high Coulombic efficiency of 99%. On the other hand, the poor rate performances are the problem; the capacities remained at approximately 1300 mAh/g at 12.7 μA/cm2. Heating the cell at 60 °C resulted in the improvement of the rate performance, which can be due to the improvement of the Li+conductivity of 15NaI∙LiBH4. In order to understand the correlation between the microstructure and Li+conductivity of 15NaI∙LiBH4, the as-milled sample was post-annealed and the variation in the microstructure was observed by transmission electron microscopy (TEM). It was indicated that the lattice defects, such as dislocation and lattice distortion, have a significant contribution for the Li+ion conductivity of the 15NaI∙LiBH4.