All-Solid-State Lithium-Ion Batteries Using the Li3AlF6-Based Composite as the Solid Electrolyte
All-Solid-State Lithium-Ion Batteries Using the Li3AlF6-Based Composite as the Solid Electrolyte
复制标题
以Li3AlF6基复合材料为固体电解质的全固态锂离子电池
DOI：
10.1021/acsaem.2c02985
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
and Yuji Katsuda
中科院分区：
文献类型：
--
作者：
Reona Miyazaki;Satoshi Ozaki;En Yagi;Yosuke Sato;Yoshimasa Kobayashi;Toshihiro Yoshida;and Yuji Katsuda
All-solid-state lithium-ion batteries (LIBs) are considered promising energy storage devices owing to their high energy density and safety. The development of solid electrolytes with high Li+conductivity, wide electrochemical stability window, air stability, and favorable mechanical properties directly leads to the realization of high-performance all-solid-state LIBs. Fluoride-based materials are potential candidates that meet these requirements. In the present study, Li+conductivity and the electrochemical performance of β-Li3AlF6-based composites have been reported. The amorphous Li3AlF6–Li2SO4composites were fabricated via planetary ball milling. The conductivity of Li3AlF6–Li2SO4(Li2SO4: 50 mol %), when ball-milled for 70 h, was 6 × 10–4S/cm at 150 °C. The conductivity did not degrade when Li3AlF6–Li2SO4was kept at 150 °C for 12 h. In the cyclic voltammetry measurements, the Li plating/stripping current was clearly observed at 0 V (vs Li+/Li), and the continuous anodic decomposition of Li3AlF6–Li2SO4was not confirmed up to 5 V (vs Li+/Li). Using Li3AlF6–Li2SO4as the solid electrolyte, the all-solid-state LIB of graphite/Li (Ni0.3Co0.6Mn0.1)O2was fabricated by uniaxial pressing without sintering. The battery was fabricated and its performance was evaluated at 120 °C in a dry room, where the dew point was maintained at −40 °C. A discharge capacity of 99 mAh/g was obtained at 0.1 C, which was maintained at 88 mAh/g at 1 C. The charge–discharge cycles were stable, and drastic capacity fading was not observed for 47 cycles at 1 C. The results indicate that fluoride-based materials are promising candidates for solid electrolytes in all-solid-state LIBs.
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