Electrochemical and ex situ XRD studies of a LiMn1.5Ni0.5O4 high-voltage cathode material

2005 ◽  
Vol 50 (20) ◽  
pp. 4104-4108 ◽  
Author(s):  
H.M. Wu ◽  
J.P. Tu ◽  
Y.F. Yuan ◽  
Y. Li ◽  
X.B. Zhao ◽  
...  
Keyword(s):  
Cathode Material ◽  
High Voltage ◽  
Ex Situ ◽  
Xrd Studies ◽  
Ex Situ Xrd

Ex-situ XRD studies of CoSb3 compound as the anode material for lithium ion batteries

2003 ◽  
Vol 542 ◽  
pp. 1-6 ◽  
Author(s):  
Jian Xie ◽  
Xinbing Zhao ◽  
Gaoshao Cao ◽  
Yaodong Zhong ◽  
Mingjian Zhao
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Lithium Ion ◽  
Ex Situ ◽  
Xrd Studies ◽  
Ex Situ Xrd

scholarly journals Extended Interfacial Stability Through Simple Acid Rinsing in a Li-Rich Oxide Cathode Material

2019 ◽  
Author(s):  
Srinivasan Ramakrishnan ◽  
Byungchun Park ◽  
Jue Wu ◽  
Wanli Yang ◽  
Bryan D. McCloskey
Keyword(s):  
Cathode Material ◽  
Surface Treatment ◽  
High Voltage ◽  
Surface Passivation ◽  
Photoelectron Spectra ◽  
Ex Situ ◽  
Rate Performance ◽  
Interfacial Instabilities ◽  
X Ray ◽  
Oxide Cathode

<p>Layered Li-rich Ni, Mn, Co (NMC) oxide cathodes in Li-ion batteries provide high specific capacities (>250 mAh/g) via O-redox at high voltages. However, associated high-voltage interfacial degradation processes require strategies for effective electrode surface passivation. Here, we show that an acidic surface treatment of a Li-rich NMC layered oxide cathode material leads to a substantial suppression of CO<sub>2</sub> and O<sub>2</sub> evolution, ~90% and ~100% respectively, during the first charge up to 4.8 V vs. Li<sup>+/0</sup>. CO<sub>2</sub> suppression is related to Li<sub>2</sub>CO<sub>3</sub> removal as well as effective surface passivation against electrolyte degradation. This treatment does not result in any loss of discharge capacity and provides superior long-term cycling and rate performance compared to as-received, untreated materials. We also quantify the extent of lattice oxygen participation in charge compensation (“O-redox”) during Li<sup>+</sup> removal by a novel ex-situ acid titration. Our results indicate that the peroxo-like species resulting from O-redox originate on the surface at least 300 mV earlier than the activation plateau region around 4.5 V. X-ray photoelectron spectra and Mn<i>-L</i> X-ray absorption spectra of the cathode powders reveal a Li<sup>+</sup> deficiency and a partial reduction of Mn ions on the surface of the acid-treated material. More interestingly, although the irreversible oxygen evolution is greatly suppressed through the surface treatment, our O K-edge resonant inelastic X-ray scattering shows the lattice O-redox behavior largely sustained. The acidic treatment, therefore, only optimizes the surface of the Li-rich material and almost eliminates the irreversible gas evolution, leading to improved cycling and rate performance. This work therefore presents a simple yet effective approach to passivate cathode surfaces against interfacial instabilities during high-voltage battery operation.</p>

scholarly journals Extended Interfacial Stability Through Simple Acid Rinsing in a Li-Rich Oxide Cathode Material

2019 ◽  
Author(s):  
Srinivasan Ramakrishnan ◽  
Byungchun Park ◽  
Jue Wu ◽  
Wanli Yang ◽  
Bryan D. McCloskey
Keyword(s):  
Cathode Material ◽  
Surface Treatment ◽  
High Voltage ◽  
Surface Passivation ◽  
Photoelectron Spectra ◽  
Ex Situ ◽  
Rate Performance ◽  
Interfacial Instabilities ◽  
X Ray ◽  
Oxide Cathode

<p>Layered Li-rich Ni, Mn, Co (NMC) oxide cathodes in Li-ion batteries provide high specific capacities (>250 mAh/g) via O-redox at high voltages. However, associated high-voltage interfacial degradation processes require strategies for effective electrode surface passivation. Here, we show that an acidic surface treatment of a Li-rich NMC layered oxide cathode material leads to a substantial suppression of CO<sub>2</sub> and O<sub>2</sub> evolution, ~90% and ~100% respectively, during the first charge up to 4.8 V vs. Li<sup>+/0</sup>. CO<sub>2</sub> suppression is related to Li<sub>2</sub>CO<sub>3</sub> removal as well as effective surface passivation against electrolyte degradation. This treatment does not result in any loss of discharge capacity and provides superior long-term cycling and rate performance compared to as-received, untreated materials. We also quantify the extent of lattice oxygen participation in charge compensation (“O-redox”) during Li<sup>+</sup> removal by a novel ex-situ acid titration. Our results indicate that the peroxo-like species resulting from O-redox originate on the surface at least 300 mV earlier than the activation plateau region around 4.5 V. X-ray photoelectron spectra and Mn<i>-L</i> X-ray absorption spectra of the cathode powders reveal a Li<sup>+</sup> deficiency and a partial reduction of Mn ions on the surface of the acid-treated material. More interestingly, although the irreversible oxygen evolution is greatly suppressed through the surface treatment, our O K-edge resonant inelastic X-ray scattering shows the lattice O-redox behavior largely sustained. The acidic treatment, therefore, only optimizes the surface of the Li-rich material and almost eliminates the irreversible gas evolution, leading to improved cycling and rate performance. This work therefore presents a simple yet effective approach to passivate cathode surfaces against interfacial instabilities during high-voltage battery operation.</p>

scholarly journals One-pot coating of LiCoPO4/C by a UiO-66 metal–organic framework

RSC Advances ◽  
2020 ◽  
Vol 10 (58) ◽  
pp. 35206-35213
Author(s):  
Abdelaziz M. Aboraia ◽  
Viktor V. Shapovalov ◽  
Alexnader A. Guda ◽  
Vera V. Butova ◽  
Alexander Soldatov
Keyword(s):  
Cathode Material ◽  
Electrochemical Properties ◽  
High Voltage ◽  
Metal Organic Framework ◽  
One Pot ◽  
Metal Organic ◽  
Organic Framework

LiCoPO4 (LCP) is a promising high voltage cathode material but suffers from low conductivity and poor electrochemical properties.

Realization of a High-Voltage and High-Rate Nickel-Rich NCM Cathode Material for LIBs by Co and Ti Dual Modification

2021 ◽  
Author(s):  
Xiaoyu Zhang ◽  
Yuegang Qiu ◽  
Fangyuan Cheng ◽  
Peng Wei ◽  
Yuyu Li ◽  
...  
Keyword(s):  
Cathode Material ◽  
High Voltage ◽  
High Rate

First Principles Calculations on Lithium Diffusion near Surface and in Bulk of Fe-doped LiCoPO4

2021 ◽  
Author(s):  
Kuan-Ching Wu ◽  
Chieh-Ming Hsieh ◽  
Bor Kae Chang
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
High Voltage ◽  
First Principles ◽  
Energy Barrier ◽  
Lithium Ion ◽  
First Principles Calculations ◽  
Near Surface ◽  
Lithium Diffusion ◽  
Olivine Phosphate

The olivine phosphate LiCoPO4 is a prospective cathode material in high voltage lithium ion batteries. During lithium diffusion, the ions must overcome diffusion energy barrier near the surface and in...

scholarly journals Na2Fe3(SO4)4 as a new high-voltage potential cathode material for sodium-ion batteries

2021 ◽  
Vol 130 (1B) ◽  
pp. 59-67
Author(s):  
Thien Lan Tran ◽  
Huu Duc Luong ◽  
Trong Lam Pham ◽  
Viet Bac Phung ◽  
Van An Dinh
Keyword(s):  
Cathode Material ◽  
High Voltage ◽  
Density Functional ◽  
Diffusion Processes ◽  
Small Polaron ◽  
Diffusion Mechanism ◽  
Sodium Ion ◽  
Structure Stability ◽  
Sodium Ion Batteries ◽  
Significant Difference

Based on the density functional theory, we propose a promising cathode material, Na2Fe3(SO4)4, applicable for sodium-ion batteries. The crystal structure, stability, average voltage, and diffusion mechanism are carefully investigated to evaluate the electrochemical properties. The proposed material exhibits a high voltage of 4.0 V during the Na extraction. A small polaron is proved to be formed preferably at the first nearest Fe sites to Na vacancy and simultaneously accompanies the Na vacancy during its migration. Four elementary diffusion processes of the polaron–Na vacancy complexes, namely two parallel and two crossing processes, have been explored. The significant difference of activation energies between parallel and crossing processes suggests the substantial effect of the small polaron migration on the Na vacancy diffusion. We found that the parallel process along the [001] direction has the lowest activation energy of 808 meV, implying that the Na vacancy preferably diffuses in a zigzag pathway along the [001] direction.

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