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%.
Highlights
Li-ion batteries (LIBs) are widely used in portable devices and play a major role in the fast-growing electro-mobility market
Solid-state electrolytes (SSEs) are promising candidates for resolving the intrinsic limitations of the organic liquid electrolyte currently employed in LIBs, such as the low cation transference number, the incompatibility and reactivity with lithium metal anodes, and flammability.[1−3] Such drawbacks limit the cell energy density and require major safety precautions
The Li-ion conductivity of LiBH4 was improved in all cases, and the samples containing 53 v/v % of MgO showed the best enhancement (2.86 × 10−4 S cm−1 at 20 °C), since the volume fraction of LiBH4 allowed to completely fill the pore volume of MgO
Summary
Li-ion batteries (LIBs) are widely used in portable devices and play a major role in the fast-growing electro-mobility market. Solid-state electrolytes (SSEs) are promising candidates for resolving the intrinsic limitations of the organic liquid electrolyte currently employed in LIBs, such as the low cation transference number, the incompatibility (due to the uneven Li plating resulting in shortcuts) and reactivity with lithium metal anodes, and flammability.[1−3] Such drawbacks limit the cell energy density and require major safety precautions. SSEs can overcome these hindrances or bottleneck limitations, thanks to their intrinsic stiffness, which makes them less prone to dendrite penetration.[4] superior chemical stability allows the use of metallic lithium as a negative electrode.[5,6] The improved safety naturally comes from the solid nature of the electrolyte. An SSE must fulfill several requirements to be employed in an all-solid-state battery (SSB), such as a Li-ion conductivity higher than 10−3 S cm−1 at room temperature (RT), a negligible electronic conductivity, and a wide electrochemical stability window.[3]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
