Enhancing Li-Ion Conductivity in LiBH4-Based Solid Electrolytes by Adding Various Nanosized Oxides

Valerio Gulino; Laura Barberis; Peter Ngene; Marcello Baricco; Petra E. De Jongh

doi:10.1021/acsaem.9b02268

Enhancing Li-Ion Conductivity in LiBH₄-Based Solid Electrolytes by Adding Various Nanosized Oxides

Valerio Gulino
, Laura Barberis
, Peter Ngene
, Marcello Baricco^*
, Petra E. De Jongh

^*Corresponding author for this work

University of Turin

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Solid-state ion conductors are gaining increasing importance, among other ion conductors, to enable a transition to next-generation all-solid-state Li batteries. However, few lightweight and low-cost materials show sufficiently high Li-ion conduction at room temperature to be used as solid electrolytes. Here, we report the effect of adding nanosized oxides, SiO₂, CaO, MgO, Î-Al₂O₃, TiO₂, and ZrO₂, to LiBH₄ by ball-milling. In all cases, the room temperature Li-ion conductivity was greatly enhanced. For SiO₂, which has been reported before as a conductivity enhancing material, the highest conductivity (4.1 × 10^-5 S/cm at 40 °C) and the lowest activation energy (0.49 eV) were found at 20 v/v% SiO₂. For the first time, ZrO₂ and MgO were also added to LiBH₄, leading to more than a 4 orders of magnitude increase in conductivity at 40 °C, reaching 0.26 and 0.18 mS/cm, respectively. Based on insights into the effect of structural properties on conductivity, we present a set of general guidelines to maximize the Li-ion conductivity in these nanocomposite solid electrolytes, independently of the type of oxide added. We expect that these results and insights will be helpful for the further development of new room temperature solid-state ion conductors.

Original language	English
Pages (from-to)	4941-4948
Number of pages	8
Journal	ACS Applied Energy Materials
Volume	3
Issue number	5
DOIs	https://doi.org/10.1021/acsaem.9b02268
Publication status	Published - 26 May 2020

Funding

Financial support from The Netherlands Organisation for Scientific Research (NWO-ECHO) is gratefully acknowledged. V.G. and L.B. thank the Erasmus Traineeship Programme for the financial support in the exchange mobility period between the University of Utrecht and the University of Turin. The authors kindly acknowledge Sander Lambregts, Laura de Kort, and Jan Willem de Rijk for technical support in the laboratory.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

complex metal hydrides
ionic conductivity
lithium-ion batteries
nanocomposites
solid electrolytes

Access to Document

10.1021/acsaem.9b02268

acsaem.9b02268Final published version, 2.08 MB

Cite this

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title = "Enhancing Li-Ion Conductivity in LiBH4-Based Solid Electrolytes by Adding Various Nanosized Oxides",

abstract = "Solid-state ion conductors are gaining increasing importance, among other ion conductors, to enable a transition to next-generation all-solid-state Li batteries. However, few lightweight and low-cost materials show sufficiently high Li-ion conduction at room temperature to be used as solid electrolytes. Here, we report the effect of adding nanosized oxides, SiO2, CaO, MgO, {\^I}-Al2O3, TiO2, and ZrO2, to LiBH4 by ball-milling. In all cases, the room temperature Li-ion conductivity was greatly enhanced. For SiO2, which has been reported before as a conductivity enhancing material, the highest conductivity (4.1 {\texttimes} 10-5 S/cm at 40 °C) and the lowest activation energy (0.49 eV) were found at 20 v/v\% SiO2. For the first time, ZrO2 and MgO were also added to LiBH4, leading to more than a 4 orders of magnitude increase in conductivity at 40 °C, reaching 0.26 and 0.18 mS/cm, respectively. Based on insights into the effect of structural properties on conductivity, we present a set of general guidelines to maximize the Li-ion conductivity in these nanocomposite solid electrolytes, independently of the type of oxide added. We expect that these results and insights will be helpful for the further development of new room temperature solid-state ion conductors.",

keywords = "complex metal hydrides, ionic conductivity, lithium-ion batteries, nanocomposites, solid electrolytes",

author = "Valerio Gulino and Laura Barberis and Peter Ngene and Marcello Baricco and \{De Jongh\}, \{Petra E.\}",

year = "2020",

month = may,

day = "26",

doi = "10.1021/acsaem.9b02268",

language = "English",

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journal = "ACS Applied Energy Materials",

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T1 - Enhancing Li-Ion Conductivity in LiBH4-Based Solid Electrolytes by Adding Various Nanosized Oxides

AU - Gulino, Valerio

AU - Barberis, Laura

AU - Ngene, Peter

AU - Baricco, Marcello

AU - De Jongh, Petra E.

PY - 2020/5/26

Y1 - 2020/5/26

N2 - Solid-state ion conductors are gaining increasing importance, among other ion conductors, to enable a transition to next-generation all-solid-state Li batteries. However, few lightweight and low-cost materials show sufficiently high Li-ion conduction at room temperature to be used as solid electrolytes. Here, we report the effect of adding nanosized oxides, SiO2, CaO, MgO, Î-Al2O3, TiO2, and ZrO2, to LiBH4 by ball-milling. In all cases, the room temperature Li-ion conductivity was greatly enhanced. For SiO2, which has been reported before as a conductivity enhancing material, the highest conductivity (4.1 × 10-5 S/cm at 40 °C) and the lowest activation energy (0.49 eV) were found at 20 v/v% SiO2. For the first time, ZrO2 and MgO were also added to LiBH4, leading to more than a 4 orders of magnitude increase in conductivity at 40 °C, reaching 0.26 and 0.18 mS/cm, respectively. Based on insights into the effect of structural properties on conductivity, we present a set of general guidelines to maximize the Li-ion conductivity in these nanocomposite solid electrolytes, independently of the type of oxide added. We expect that these results and insights will be helpful for the further development of new room temperature solid-state ion conductors.

AB - Solid-state ion conductors are gaining increasing importance, among other ion conductors, to enable a transition to next-generation all-solid-state Li batteries. However, few lightweight and low-cost materials show sufficiently high Li-ion conduction at room temperature to be used as solid electrolytes. Here, we report the effect of adding nanosized oxides, SiO2, CaO, MgO, Î-Al2O3, TiO2, and ZrO2, to LiBH4 by ball-milling. In all cases, the room temperature Li-ion conductivity was greatly enhanced. For SiO2, which has been reported before as a conductivity enhancing material, the highest conductivity (4.1 × 10-5 S/cm at 40 °C) and the lowest activation energy (0.49 eV) were found at 20 v/v% SiO2. For the first time, ZrO2 and MgO were also added to LiBH4, leading to more than a 4 orders of magnitude increase in conductivity at 40 °C, reaching 0.26 and 0.18 mS/cm, respectively. Based on insights into the effect of structural properties on conductivity, we present a set of general guidelines to maximize the Li-ion conductivity in these nanocomposite solid electrolytes, independently of the type of oxide added. We expect that these results and insights will be helpful for the further development of new room temperature solid-state ion conductors.

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KW - lithium-ion batteries

KW - nanocomposites

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