Diffusion coefficient measurement of lithium ion in sintered Li1.33Ti1.67O4 by means of neutron radiography

Takai, Shigeomi

doi:10.1016/s0167-2738(99)00095-8

Cited by 179 publications

(62 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[80][81][82][83][84]), only a few investigations can be found that are concerned with Li self-diffusion in the host material (x = 0). [56,84,129,130] Li 4 + x Ti 5 O 12 with x > 0 turned out to be a material with fast Li diffusion, whereas Li motions in Li 4 Ti 5 O 12 are extremely slow. [56] By using SAE NMR spectroscopy, Li jump rates ranging from 1 to 2200 s À1 can be directly measured between 295 and 400 K by recording mixing-time-dependent echo intensities ( Figure 9).…”

mentioning

confidence: 97%

From Micro to Macro: Access to Long‐Range Li⁺ Diffusion Parameters in Solids via Microscopic ^6, 7Li Spin‐Alignment Echo NMR Spectroscopy

2011

View full text Add to dashboard Cite

The development of highly conductive solids is a rapidly growing research area in materials science. In particular, the study of Li-ion conductors is driven by the ambitious effort to design powerful lithium-ion batteries. A deeper understanding of Li dynamics in solids requires the availability of a large set of complementary techniques to probe Li self-diffusion on different length and time-scales. We report on (7)Li as well as (6)Li spin-alignment echo (SAE) nuclear magnetic resonance (NMR) spectroscopy, which is capable of probing long-range diffusion parameters from a microscopic, that is, atomic-scale, point of view. So far, variable-temperature SAE NMR spectroscopy has been applied to a number of polycrystalline and glassy Li-ion conductors. The materials investigated serve as model systems to unravel the interesting features of the technique in determining reliable Li jump rates and hopping activation energies. In particular, the latter are compared with those probed by macroscopic techniques such as dc-conductivity measurements that are sensitive to long-range translational motions.

show abstract

mentioning

confidence: 97%

From Micro to Macro: Access to Long‐Range Li⁺ Diffusion Parameters in Solids via Microscopic ^6, 7Li Spin‐Alignment Echo NMR Spectroscopy

2011

View full text Add to dashboard Cite

show abstract

“…Studies range inter alia from electrolyte filling to lithiation processes and active material synthesis. [26][27][28] In the present study, we provide a direct and detailed comparison of LFP/graphite and LFMP/graphite full-cells in order to determine the influence of manganese on the initial gas evolution by means of neutron imaging (NI). Additionally, we use Prompt Gamma Activation Analysis (PGAA) to understand the long-term development of Mn dissolution and its relation to capacity retention.…”

mentioning

confidence: 99%

Gas Evolution and Capacity Fading in LiFe_xMn_1-xPO₄/Graphite Cells Studied by Neutron Imaging and Neutron Induced Prompt Gamma Activation Analysis

Starke

Seidlmayer

Schulz

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

The gas evolution in LFP/graphite and LFMP/graphite cells during the formation has been analyzed via neutron imaging (NI). The results show that in LFMP/graphite cells approximately 30% more gas is generated in comparison to LFP/graphite and stronger gas evolution is associated with the presence of Mn. For the LFP/graphite cell two different linear phases in gas evolution rate can be detected while LFMP/graphite cells reveal an additional phase. In both full-cells a distinct relation between gas evolution and electrode potentials has been determined. Additional neutron induced Prompt Gamma Activation Analysis (PGAA) measurements were carried out in order to correlate long-term Mn dissolution and capacity retention. Long-term cycling showed higher capacity retention for the LFMP/graphite cells. The results of PGAA prove that Mn dissolution decreases rapidly with increased cycle number and the Mn dissolution rate of LFMP is far below values observed for oxide-type cathode materials. Long-term cycling showed that the negative effects of higher irreversible capacity loss in the formation step and more gas evolution of LFMP/graphite cells in comparison to LFP/graphite cells is compensated after several cycles due to higher capacity retention. Due to their high energy density and operating voltage lithiumion batteries are a key technology for mobile applications such as communication devices and electric vehicles.1-3 But also stationary energy storage systems are increasingly developed under usage of lithium-ion technology. Those stationary storage systems range from small (e. g. home storage for photovoltaic plants) to large scale applications (grid stabilization). [4][5][6] Especially in cases of high capital expenditures, consumers and operators expect a long battery lifetime in terms of capacity and charge and discharge characteristics.Applications like home energy storage require high operational safety standards. These requirements are met by the cathode active material LiFePO 4 (LFP), which has first been described in 1997. Phospho-olivines such as LFP provide good operational characteristics in terms of thermal runaways and are furthermore environmentally friendly and cost-efficient. The dissolution of Mn from LFMP as such has recently been investigated and a strong correlation between dissolved Mn and traces of H 2 O contamination in the electrolyte has been stated. It has also been found that in case of LFMP there is no selective dissolution of Mn since Fe is dissolved as well and the Mn/Fe ratio in the electrolyte and the active material is equal. 18Another study has shown that transition metal dissolution also occurs in oxide-type active materials such as layered Nickel-ManganeseCobalt oxide based active materials (NMC). 19 In case of NMC all z E-mail: benjamin.starke@haw-landshut.de present transition metals Ni, Mn and Co dissolve in the electrolyte and migrate to the anodic graphite. But while Ni and Co remain in the oxidation state +II, Mn is reduced to Mn 0 and subsequently reoxidized to Mn 2+ under co...

show abstract

“…The authors demonstrated that the 3 V hybrid supercapacitor was able to deliver 11 Wh kg −1 energy density and up to 4 kW kg −1 power density21. However, poor electronic conductivity (<10 −13 S cm −1 )22 and sluggish Li + diffusion (<10 −6 cm 2 s −1 )23 are the biggest obstacles for as-fabricated Li 4 Ti 5 O 12 electrodes. In order to balance the slow faradic process and double-layer capacitance, the poor power performance of Li 4 Ti 5 O 12 should be improved by combining Li 4 Ti 5 O 12 with some electrically conductive materials or nanocrystallization.…”

mentioning

confidence: 99%

Porous mesocarbon microbeads with graphitic shells: constructing a high-rate, high-capacity cathode for hybrid supercapacitor

Lei

Huang

Yang

et al. 2013

Sci Rep

View full text Add to dashboard Cite

Li4Ti5O12/activated carbon hybrid supercapacitor can combine the advantages of both lithium-ion battery and supercapacitor, which may meet the requirements for developing high-performance hybrid electric vehicles. Here we proposed a novel “core-shell” porous graphitic carbon (PGC) to replace conventional activated carbon for achieving excellent cell performance. In this PGC structure made from mesocarbon microbead (MCMB), the inner core is composed of porous amorphous carbon, while the outer shell is graphitic carbon. The abundant porosity and the high surface area not only offer sufficient reaction sites to store electrical charge physically, but also can accelerate the liquid electrolyte to penetrate the electrode and the ions to reach the reacting sites. Meanwhile, the outer graphitic shells of the porous carbon microbeads contribute to a conductive network which will remarkably facilitate the electron transportation, and thus can be used to construct a high-rate, high-capacity cathode for hybrid supercapacitor, especially at high current densities.

show abstract

Diffusion coefficient measurement of lithium ion in sintered Li1.33Ti1.67O4 by means of neutron radiography

Cited by 179 publications

References 5 publications

From Micro to Macro: Access to Long‐Range Li⁺ Diffusion Parameters in Solids via Microscopic ^6, 7Li Spin‐Alignment Echo NMR Spectroscopy

From Micro to Macro: Access to Long‐Range Li⁺ Diffusion Parameters in Solids via Microscopic ^6, 7Li Spin‐Alignment Echo NMR Spectroscopy

Gas Evolution and Capacity Fading in LiFe_xMn_1-xPO₄/Graphite Cells Studied by Neutron Imaging and Neutron Induced Prompt Gamma Activation Analysis

Porous mesocarbon microbeads with graphitic shells: constructing a high-rate, high-capacity cathode for hybrid supercapacitor

Contact Info

Product

Resources

About

Diffusion coefficient measurement of lithium ion in sintered Li1.33Ti1.67O4 by means of neutron radiography

Cited by 179 publications

References 5 publications

From Micro to Macro: Access to Long‐Range Li+ Diffusion Parameters in Solids via Microscopic 6, 7Li Spin‐Alignment Echo NMR Spectroscopy

From Micro to Macro: Access to Long‐Range Li+ Diffusion Parameters in Solids via Microscopic 6, 7Li Spin‐Alignment Echo NMR Spectroscopy

Gas Evolution and Capacity Fading in LiFexMn1-xPO4/Graphite Cells Studied by Neutron Imaging and Neutron Induced Prompt Gamma Activation Analysis

Porous mesocarbon microbeads with graphitic shells: constructing a high-rate, high-capacity cathode for hybrid supercapacitor

Contact Info

Product

Resources

About

From Micro to Macro: Access to Long‐Range Li⁺ Diffusion Parameters in Solids via Microscopic ^6, 7Li Spin‐Alignment Echo NMR Spectroscopy

From Micro to Macro: Access to Long‐Range Li⁺ Diffusion Parameters in Solids via Microscopic ^6, 7Li Spin‐Alignment Echo NMR Spectroscopy

Gas Evolution and Capacity Fading in LiFe_xMn_1-xPO₄/Graphite Cells Studied by Neutron Imaging and Neutron Induced Prompt Gamma Activation Analysis