Structural evidence for Mg-doped LiFePO4 electrode polarisation in commercial Li-ion batteries

Goonetilleke, Damian; Faulkner, Titus J.; Peterson, Vanessa K.; Sharma, Neeraj

doi:10.1016/j.jpowsour.2018.05.024

Cited by 30 publications

(17 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…230 A shi in the potential at which the features are observed may also be observed as the applied current is varied, which can be indicative of electrode polarisation. 116,231 More recently, the application of statistical analysis and machine learning to voltage capacity proles has also highlighted the potential for them to be a useful prognostic indicator to predict cycle life and cell failures. 232 The measured cell voltage is dened by the difference in sodium electrochemical potential between the two electrodes, and in the case of half-cells typically reported in literature, this means the potential is measured vs. sodium metal.…”

Section: Analysis Of Cycling Datamentioning

confidence: 99%

Probing the charged state of layered positive electrodes in sodium-ion batteries: reaction pathways, stability and opportunities

2020

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Analysis Of Cycling Datamentioning

confidence: 99%

Probing the charged state of layered positive electrodes in sodium-ion batteries: reaction pathways, stability and opportunities

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Neutron powder diffraction has been established as an excellent in situ or operando technique for investigating the crystallographic transitions which occur in materials inside functional devices, such as batteries. − Neutron scattering cross sections are favorable to allow a greater sensitivity to elements commonly found in battery electrodes than obtained using X-ray scattering methods, and neutrons are able to penetrate through the battery casing as well as active components, allowing the study of commercial cells with little or no modification. − However, the large incoherent scattering from hydrogen from components such as the electrolyte and separator can obscure the diffraction signal from components of interest such as the electrodes. The substitution of hydrogen for deuterium such as in the deuterated forms of carbonate-based electrolytes typically used in Li-ion batteries is sometimes necessary, but can be prohibitively expensive .…”

mentioning

confidence: 99%

Structural Evolution and High-Voltage Structural Stability of Li(Ni_xMn_yCo_z)O₂Electrodes

et al. 2018

Self Cite

View full text Add to dashboard Cite

Positive electrode materials remain a limiting factor for the energy density of lithium-ion batteries (LIBs). Improving the structural stability of these materials over a wider potential window presents an opportune path to higher energy density LIBs. Herein, operando neutron diffraction is used to elucidate the relationship between the structural evolution and electrochemical behavior for a series of Li-ion pouch cells containing Li(Ni x Mn y Co z )O 2 (x + y + z = 1) electrode chemistries. The structural stability of these electrodes during charge and discharge cycling across a wide potential window is found to be influenced by the ratio of transition-metal atoms in the material. Of the electrodes investigated in this study, the Li(Ni 0.4 Mn 0.4 Co 0.2 )O 2 composition exhibits the smallest magnitude of structural expansion and contraction during cycling while also providing favorable structural stability at high voltage. Greater structural change was observed in electrodes with a higher Ni content, while decreasing inversely to the Ni and Co content in the positive electrode. The combination of structural and electrochemical characterization of a wide range of NMC compositions provides useful insight for the design and application of ideal electrode compositions for long-term cycling and structural stability during storage at the charged state.

show abstract

“…These reversible capacities of 167.51, 163.8, 157.5, 149.95, 143.52, 132.06, and 122.43 mAh g –1 are calculated at different rates of 0.5–10 C. Stable charging trends can be assigned to the promising electrochemical kinetics, which is due to the presence of CNTs. At the same time, the decrease of the voltage platform is found at an increased rate, which is due to the ohmic impedance and electrochemical polarization caused by the high current density. , …”

Section: Results and Discussionmentioning

confidence: 92%

“…At the same time, the decrease of the voltage platform is found at an increased rate, which is due to the ohmic impedance and electrochemical polarization caused by the high current density. 36,37 Electrochemical impedance spectroscopy (EIS) is widely used to investigate electrode kinetics after the electrochemical process. Figure 4a,b shows the Nyquist plots of both electrodes before and after cycling.…”

Section: Resultsmentioning

confidence: 99%

Construction of Kinetics Pathways in Lithium Titanate Composite Material to Quickly Store Sodium Ion for the Dual-Ion Batteries

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

High rate storage of sodium ions in lithium titanate still stay unsolved, although the sodium as a medium in such materials can reduce the voltage platform and enhance the high energy density of electrochemical batteries. Herein, the composite lithium titanate/carbon nanotube materials are synthesized to improve the kinetics process by designing pathways to migrate the electrons and ions. A special micronanomaterial comprises many micropores/mesopores formed from nanoparticles of lithium titanate and slender carbon nanotubes with a natural curvature style. Thus, it significantly decreases the kinetics barriers and electrochemical impedance under the charge of a high rate. It is used as sodium-based dual-ion batteries and displays the excellent electrochemical performance, such as a wide voltage window (about 1− 4.6 V), a long cycling stability (∼148 mAh g −1 after 500 cycles), and an outstanding rate capability (∼102 mAh g −1 at 20 C). Our works demonstrate that a high rate capability may be enabled by a facile design of dual-ion batteries, which avoid the long-term difficulty of sodium-ion batteries and present new opportunities of high-power battery devices.

show abstract

Structural evidence for Mg-doped LiFePO4 electrode polarisation in commercial Li-ion batteries

Cited by 30 publications

References 66 publications

Probing the charged state of layered positive electrodes in sodium-ion batteries: reaction pathways, stability and opportunities

Probing the charged state of layered positive electrodes in sodium-ion batteries: reaction pathways, stability and opportunities

Structural Evolution and High-Voltage Structural Stability of Li(Ni_xMn_yCo_z)O₂Electrodes

Construction of Kinetics Pathways in Lithium Titanate Composite Material to Quickly Store Sodium Ion for the Dual-Ion Batteries

Contact Info

Product

Resources

About

Structural evidence for Mg-doped LiFePO4 electrode polarisation in commercial Li-ion batteries

Cited by 30 publications

References 66 publications

Probing the charged state of layered positive electrodes in sodium-ion batteries: reaction pathways, stability and opportunities

Probing the charged state of layered positive electrodes in sodium-ion batteries: reaction pathways, stability and opportunities

Structural Evolution and High-Voltage Structural Stability of Li(NixMnyCoz)O2Electrodes

Construction of Kinetics Pathways in Lithium Titanate Composite Material to Quickly Store Sodium Ion for the Dual-Ion Batteries

Contact Info

Product

Resources

About

Structural Evolution and High-Voltage Structural Stability of Li(Ni_xMn_yCo_z)O₂Electrodes