en
Scientific article
Open access
English

Nido‐Hydroborate‐Based Electrolytes for All‐Solid‐State Lithium Batteries

Published inAdvanced Functional Materials, vol. 31, no. 18, 2010046
Publication date2021
Abstract

Hydroborate‐based solid electrolytes have recently been successfully employed in high voltage, room temperature all‐solid‐state sodium batteries. The transfer to analogous lithium systems has failed up to now due to the lower conductivity of the corresponding lithium compounds and their high cost. Here LiB11H14 nido‐hydroborate as a cost‐effective building block and its high‐purity synthesis is introduced. The crystal structures of anhydrous LiB11H14 as well as of LiB11H14‐based mixed‐anion solid electrolytes are solved and high ionic conductivities of 1.1 × 10−4 S cm−1 for Li2(B11H14)(CB11H12) and 1.1 × 10−3 S cm−1 for Li3(B11H14)(CB9H10)2 are obtained, respectively. LiB11H14 exhibits an oxidative stability limit of 2.6 V versus Li+/Li and the proposed decomposition products are discussed based on density functional theory calculations. Strategies are discussed to improve the stability of these compounds by modifying the chemical structure of the nido‐hydroborate cage. Galvanostatic cycling in symmetric cells with two lithium metal electrodes shows a small overpotential increase from 22.5 to 30 mV after 620 h (up to 0.5 mAh cm−2), demonstrating that the electrolyte is compatible with metallic anodes. Finally, the Li2(B11H14)(CB11H12) electrolyte is employed in a proof‐of‐concept half cell with a TiS2 cathode with a capacity retention of 82% after 150 cycles at C/5.

Keywords
  • Batteries tout solides
  • Electrolyte solid
  • Lithium
Research group
Funding
  • Autre - UNIGE
Citation (ISO format)
PAYANDEH, SeyedHosein et al. <i>Nido</i>‐Hydroborate‐Based Electrolytes for All‐Solid‐State Lithium Batteries. In: Advanced Functional Materials, 2021, vol. 31, n° 18, p. 2010046. doi: 10.1002/adfm.202010046
Main files (1)
Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal1616-301X
192views
75downloads

Technical informations

Creation05/06/2021 10:47:00 AM
First validation05/06/2021 10:47:00 AM
Update time03/16/2023 12:32:33 AM
Status update03/16/2023 12:32:32 AM
Last indexation01/17/2024 1:11:38 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack