Lithium-Rich Cobalt-Free Manganese-Based Layered Cathode Materials for Li-Ion Batteries: Suppressing the Voltage Fading
Lithium-rich layered oxides are recognized as promising materials for Li-ion batteries, owing to higher capacity than the currently available commercialized cathode, for their lower cost. However, their voltage decay and cycling instability during the charge/discharge process are problems that need...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2020-07-01
|
Series: | Energies |
Subjects: | |
Online Access: | https://www.mdpi.com/1996-1073/13/13/3487 |
id |
doaj-3db9674286f94f109216118df92c9503 |
---|---|
record_format |
Article |
spelling |
doaj-3db9674286f94f109216118df92c95032020-11-25T03:28:19ZengMDPI AGEnergies1996-10732020-07-01133487348710.3390/en13133487Lithium-Rich Cobalt-Free Manganese-Based Layered Cathode Materials for Li-Ion Batteries: Suppressing the Voltage FadingAshraf Abdel-Ghany0Ahmed M. Hashem1Alain Mauger2Christian M. Julien3Inorganic Chemistry Department, National Research Centre, 33 Bohouth Str. (Former El Tahir Str.), Dokki-Giza 12622, EgyptInorganic Chemistry Department, National Research Centre, 33 Bohouth Str. (Former El Tahir Str.), Dokki-Giza 12622, EgyptInstitut de Minéralogie, Physique des Matériaux et Cosmologie (IMPMC), Sorbonne Université, CNRS UMR 7590, 4 Place Jussieu, CEDEX 05, 75252 Paris, FranceInstitut de Minéralogie, Physique des Matériaux et Cosmologie (IMPMC), Sorbonne Université, CNRS UMR 7590, 4 Place Jussieu, CEDEX 05, 75252 Paris, FranceLithium-rich layered oxides are recognized as promising materials for Li-ion batteries, owing to higher capacity than the currently available commercialized cathode, for their lower cost. However, their voltage decay and cycling instability during the charge/discharge process are problems that need to be solved before their practical application can be envisioned. These problems are mainly associated with a phase transition of the surface layer from the layered structure to the spinel structure. In this paper, we report the AlF<sub>3</sub>-coating of the Li-rich Co-free layered Li<sub>1.2</sub>Ni<sub>0.2</sub>Mn<sub>0.6</sub>O<sub>2</sub> (LLNMO) oxide as an effective strategy to solve these problems. The samples were synthesized via the hydrothermal route that insures a very good crystallization in the layered structure, probed by XRD, energy-dispersive X-ray (EDX) spectroscopy, and Raman spectroscopy. The hydrothermally synthesized samples before and after AlF<sub>3</sub> coating are well crystallized in the layered structure with particle sizes of about 180 nm (crystallites of ~65 nm), with high porosity (pore size 5 nm) determined by Brunauer–Emmett–Teller (BET) specific surface area method. Subsequent improvements in discharge capacity are obtained with a ~5-nm thick coating layer. AlF<sub>3</sub>-coated Li<sub>1.2</sub>Ni<sub>0.2</sub>Mn<sub>0.6</sub>O<sub>2</sub> delivers a capacity of 248 mAh g<sup>−1</sup> stable over the 100 cycles, and it exhibits a voltage fading rate of 1.40 mV per cycle. According to the analysis from galvanostatic charge-discharge and electrochemical impedance spectroscopy, the electrochemical performance enhancement is discussed and compared with literature data. Post-mortem analysis confirms that the AlF<sub>3 </sub>coating is a very efficient surface modification to improve the stability of the layered phase of the Li-rich material, at the origin of the significant improvement of the electrochemical properties.https://www.mdpi.com/1996-1073/13/13/3487Li-rich oxidelayered structurecathodevoltage decayLi-ion batteries |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ashraf Abdel-Ghany Ahmed M. Hashem Alain Mauger Christian M. Julien |
spellingShingle |
Ashraf Abdel-Ghany Ahmed M. Hashem Alain Mauger Christian M. Julien Lithium-Rich Cobalt-Free Manganese-Based Layered Cathode Materials for Li-Ion Batteries: Suppressing the Voltage Fading Energies Li-rich oxide layered structure cathode voltage decay Li-ion batteries |
author_facet |
Ashraf Abdel-Ghany Ahmed M. Hashem Alain Mauger Christian M. Julien |
author_sort |
Ashraf Abdel-Ghany |
title |
Lithium-Rich Cobalt-Free Manganese-Based Layered Cathode Materials for Li-Ion Batteries: Suppressing the Voltage Fading |
title_short |
Lithium-Rich Cobalt-Free Manganese-Based Layered Cathode Materials for Li-Ion Batteries: Suppressing the Voltage Fading |
title_full |
Lithium-Rich Cobalt-Free Manganese-Based Layered Cathode Materials for Li-Ion Batteries: Suppressing the Voltage Fading |
title_fullStr |
Lithium-Rich Cobalt-Free Manganese-Based Layered Cathode Materials for Li-Ion Batteries: Suppressing the Voltage Fading |
title_full_unstemmed |
Lithium-Rich Cobalt-Free Manganese-Based Layered Cathode Materials for Li-Ion Batteries: Suppressing the Voltage Fading |
title_sort |
lithium-rich cobalt-free manganese-based layered cathode materials for li-ion batteries: suppressing the voltage fading |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2020-07-01 |
description |
Lithium-rich layered oxides are recognized as promising materials for Li-ion batteries, owing to higher capacity than the currently available commercialized cathode, for their lower cost. However, their voltage decay and cycling instability during the charge/discharge process are problems that need to be solved before their practical application can be envisioned. These problems are mainly associated with a phase transition of the surface layer from the layered structure to the spinel structure. In this paper, we report the AlF<sub>3</sub>-coating of the Li-rich Co-free layered Li<sub>1.2</sub>Ni<sub>0.2</sub>Mn<sub>0.6</sub>O<sub>2</sub> (LLNMO) oxide as an effective strategy to solve these problems. The samples were synthesized via the hydrothermal route that insures a very good crystallization in the layered structure, probed by XRD, energy-dispersive X-ray (EDX) spectroscopy, and Raman spectroscopy. The hydrothermally synthesized samples before and after AlF<sub>3</sub> coating are well crystallized in the layered structure with particle sizes of about 180 nm (crystallites of ~65 nm), with high porosity (pore size 5 nm) determined by Brunauer–Emmett–Teller (BET) specific surface area method. Subsequent improvements in discharge capacity are obtained with a ~5-nm thick coating layer. AlF<sub>3</sub>-coated Li<sub>1.2</sub>Ni<sub>0.2</sub>Mn<sub>0.6</sub>O<sub>2</sub> delivers a capacity of 248 mAh g<sup>−1</sup> stable over the 100 cycles, and it exhibits a voltage fading rate of 1.40 mV per cycle. According to the analysis from galvanostatic charge-discharge and electrochemical impedance spectroscopy, the electrochemical performance enhancement is discussed and compared with literature data. Post-mortem analysis confirms that the AlF<sub>3 </sub>coating is a very efficient surface modification to improve the stability of the layered phase of the Li-rich material, at the origin of the significant improvement of the electrochemical properties. |
topic |
Li-rich oxide layered structure cathode voltage decay Li-ion batteries |
url |
https://www.mdpi.com/1996-1073/13/13/3487 |
work_keys_str_mv |
AT ashrafabdelghany lithiumrichcobaltfreemanganesebasedlayeredcathodematerialsforliionbatteriessuppressingthevoltagefading AT ahmedmhashem lithiumrichcobaltfreemanganesebasedlayeredcathodematerialsforliionbatteriessuppressingthevoltagefading AT alainmauger lithiumrichcobaltfreemanganesebasedlayeredcathodematerialsforliionbatteriessuppressingthevoltagefading AT christianmjulien lithiumrichcobaltfreemanganesebasedlayeredcathodematerialsforliionbatteriessuppressingthevoltagefading |
_version_ |
1724584961712848896 |