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Title

Room-Temperature Solid-State Lithium-Ion Battery Using a LiBH4–MgO Composite Electrolyte

Authors
Gulino, Valerio
Ngene, Peter
de Jongh, Radovan
Baricco, Marcello
Published in ACS Applied Energy Materials. 2021, vol. 4, no. 2, p. 1228-1236
Abstract LiBH4 has been widely studied as a solid-state electrolyte in Li-ion batteries working at 120 °C due to the low ionic conductivity at room temperature. In this work, by mixing with MgO, the Li-ion conductivity of LiBH4 has been improved. The optimum composition of the mixture is 53 v/v % of MgO, showing a Li-ion conductivity of 2.86 × 10–4 S cm–1 at 20 °C. The formation of the composite does not affect the electrochemical stability window, which is similar to that of pure LiBH4 (about 2.2 V vs Li+/Li). The mixture has been incorporated as the electrolyte in a TiS2/Li all-solid-state Li-ion battery. A test at room temperature showed that only five cycles already resulted in cell failure. On the other hand, it was possible to form a stable solid electrolyte interphase by applying several charge/discharge cycles at 60 °C. Afterward, the battery worked at room temperature for up to 30 cycles with a capacity retention of about 80%.
Keywords Solid-state electrolyteLiBH4Li-ion battery
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Research group Groupe Cerny
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GULINO, Valerio et al. Room-Temperature Solid-State Lithium-Ion Battery Using a LiBH4–MgO Composite Electrolyte. In: ACS Applied Energy Materials, 2021, vol. 4, n° 2, p. 1228-1236. doi: 10.1021/acsaem.0c02525 https://archive-ouverte.unige.ch/unige:150864

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Deposited on : 2021-04-12

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