Details
| Original language | English |
|---|---|
| Pages (from-to) | 2167-2171 |
| Number of pages | 5 |
| Journal | Zeitschrift fur Anorganische und Allgemeine Chemie |
| Volume | 647 |
| Issue number | 22 |
| Early online date | 11 Jun 2021 |
| Publication status | Published - 12 Nov 2021 |
Abstract
Li4Ti5O12 (LTO) is known as one of the most robust and long-lasting anode materials in lithium-ion batteries. As yet, the Li-ion transport properties of LTO are, however, not completely understood. Here, we used broadband impedance spectroscopy spanning a wide temperature range to investigate the full electrical response of LTO over a wide frequency range. It turned out that the isotherms recorded entail information about two relaxation processes. While at high temperatures the isotherms show a frequency independent plateau that corresponds to poor long-range ion transport (<10−11 S cm−1 (298 K), 0.79 eV), they reveal a second region, seen at lower temperatures and higher frequencies, which we attribute to short-range ion dynamics (10−8 S cm−1) with a significantly reduced activation energy of ca. 0.51 eV. At even lower temperatures, the isotherms are fully governed by nearly constant loss behavior, which has frequently been explained by cage-like dynamics. The present results agree with those earlier presented by 7Li NMR spin-lattice relaxation measurements being sensitive to dynamic processes taking place on quite different length scales. Our findings unveil complex Li+ ion dynamics in LTO and help understand its superior electrochemical properties.
Keywords
- anode materials, conductivity, dielectric properties, Li diffusion, LTO
ASJC Scopus subject areas
- Chemistry(all)
- Inorganic Chemistry
Sustainable Development Goals
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In: Zeitschrift fur Anorganische und Allgemeine Chemie, Vol. 647, No. 22, 12.11.2021, p. 2167-2171.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Broadband impedance spectroscopy of Li4Ti5O12
T2 - from nearly constant loss effects to long-range ion dynamics
AU - Gadermaier, Bernhard
AU - Hogrefe, Katharina
AU - Heitjans, Paul
AU - Wilkening, H. Martin R.
N1 - Funding Information: We thank the Deutsche Forschungsgemeinschaft (DFG) for financial support in the frame of the former research unit FOR 1277 (2010–2017) “Mobilität von Lithiumionen in Festkörpern (molife)” (WI 3600 2‐1). Furthermore, financial support by the FFG project safe battery is gratefully acknowledged. P.H. is grateful to the State of Lower Saxony (Germany) for the Niedersachsen Professorship “Mobility of Ions in Solids”.
PY - 2021/11/12
Y1 - 2021/11/12
N2 - Li4Ti5O12 (LTO) is known as one of the most robust and long-lasting anode materials in lithium-ion batteries. As yet, the Li-ion transport properties of LTO are, however, not completely understood. Here, we used broadband impedance spectroscopy spanning a wide temperature range to investigate the full electrical response of LTO over a wide frequency range. It turned out that the isotherms recorded entail information about two relaxation processes. While at high temperatures the isotherms show a frequency independent plateau that corresponds to poor long-range ion transport (<10−11 S cm−1 (298 K), 0.79 eV), they reveal a second region, seen at lower temperatures and higher frequencies, which we attribute to short-range ion dynamics (10−8 S cm−1) with a significantly reduced activation energy of ca. 0.51 eV. At even lower temperatures, the isotherms are fully governed by nearly constant loss behavior, which has frequently been explained by cage-like dynamics. The present results agree with those earlier presented by 7Li NMR spin-lattice relaxation measurements being sensitive to dynamic processes taking place on quite different length scales. Our findings unveil complex Li+ ion dynamics in LTO and help understand its superior electrochemical properties.
AB - Li4Ti5O12 (LTO) is known as one of the most robust and long-lasting anode materials in lithium-ion batteries. As yet, the Li-ion transport properties of LTO are, however, not completely understood. Here, we used broadband impedance spectroscopy spanning a wide temperature range to investigate the full electrical response of LTO over a wide frequency range. It turned out that the isotherms recorded entail information about two relaxation processes. While at high temperatures the isotherms show a frequency independent plateau that corresponds to poor long-range ion transport (<10−11 S cm−1 (298 K), 0.79 eV), they reveal a second region, seen at lower temperatures and higher frequencies, which we attribute to short-range ion dynamics (10−8 S cm−1) with a significantly reduced activation energy of ca. 0.51 eV. At even lower temperatures, the isotherms are fully governed by nearly constant loss behavior, which has frequently been explained by cage-like dynamics. The present results agree with those earlier presented by 7Li NMR spin-lattice relaxation measurements being sensitive to dynamic processes taking place on quite different length scales. Our findings unveil complex Li+ ion dynamics in LTO and help understand its superior electrochemical properties.
KW - anode materials
KW - conductivity
KW - dielectric properties
KW - Li diffusion
KW - LTO
UR - http://www.scopus.com/inward/record.url?scp=85108273241&partnerID=8YFLogxK
U2 - 10.1002/zaac.202100143
DO - 10.1002/zaac.202100143
M3 - Article
AN - SCOPUS:85108273241
VL - 647
SP - 2167
EP - 2171
JO - Zeitschrift fur Anorganische und Allgemeine Chemie
JF - Zeitschrift fur Anorganische und Allgemeine Chemie
SN - 0044-2313
IS - 22
ER -