Long-range Li ion diffusion in NASICON-type Li1.5Al0.5Ge1.5(PO4)3 (LAGP) studied by 7Li pulsed-gradient spin-echo NMR

2017 ◽  
Vol 19 (34) ◽  
pp. 23483-23491 ◽  
Author(s):  
Kikuko Hayamizu ◽  
Shiro Seki
Keyword(s):  
Long Range ◽  
Spin Echo ◽  
Ion Diffusion ◽  
Nasicon Type ◽  
Li Ion ◽  
Pgse Nmr ◽  
Parameter Dependent

PGSE NMR showed parameter-dependent 7Li diffusion for a solid conductor LAGP in micrometer space, suggesting disperse mobility of Li ions.

scholarly journals Li-Ion Diffusion in Nanoconfined LiBH4-LiI/Al2O3: From 2D Bulk Transport to 3D Long-Range Interfacial Dynamics

2020 ◽  
Vol 12 (34) ◽  
pp. 38570-38583 ◽  
Author(s):  
Roman Zettl ◽  
Maria Gombotz ◽  
David Clarkson ◽  
Steven G. Greenbaum ◽  
Peter Ngene ◽  
...  
Keyword(s):  
Long Range ◽  
Ion Diffusion ◽  
Interfacial Dynamics ◽  
Li Ion ◽  
Bulk Transport

Non-uniform lithium-ion migration on micrometre scale for garnet- and NASICON-type solid electrolytes studied by 7Li PGSE-NMR diffusion spectroscopy

2018 ◽  
Vol 20 (26) ◽  
pp. 17615-17623 ◽  
Author(s):  
Kikuko Hayamizu ◽  
Shiro Seki ◽  
Tomoyuki Haishi
Keyword(s):  
Solid Electrolytes ◽  
Spin Echo ◽  
Lithium Ion ◽  
Solid Oxide ◽  
Ion Migration ◽  
Solid Oxide Electrolytes ◽  
Nasicon Type ◽  
Nmr Diffusion ◽  
Pgse Nmr

The migration behaviours of Li+ in three garnet- and one NASICON-type solid oxide electrolytes were studied on the micrometre scale by pulsed-gradient spin-echo (PGSE) 7Li NMR diffusion spectroscopy to clarify common and specific characteristics of each electrolyte.

Influence of VC and FEC Additives on Interphase Properties of Carbon in Li-Ion Cells Investigated by Combined EIS & EQCM-D

2020 ◽  
Author(s):  
Paul Kitz ◽  
Matthew Lacey ◽  
Petr Novák ◽  
Erik Berg
Keyword(s):  
Electrochemical Impedance ◽  
Solid Electrolyte Interphase ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Gas Analysis ◽  
Side Reactions ◽  
Ion Diffusion ◽  
Battery Cell ◽  
Anode Passivation ◽  
Order Of Magnitude ◽  
Li Ion

<div>The electrolyte additives vinylene carbonate (VC) and fluoroethylene carbonate (FEC) are well known for increasing the lifetime of a Li-ion battery cell by supporting the formation of an effective solid electrolyte interphase (SEI) at the anode. In this study combined simultaneous electrochemical impedance spectroscopy (EIS) and <i>operando</i> electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) are employed together with <i>in situ</i> gas analysis (OEMS) to study the influence of VC and FEC on the passivation process and the interphase properties at carbon-based anodes. In small quantities both additives reduce the initial interphase mass loading by 30 to 50 %, but only VC also effectively prevents continuous side reactions and improves anode passivation significantly. VC and FEC are both reduced at potentials above 1 V vs. Li<sup>+</sup>/Li in the first cycle and change the SEI composition which causes an increase of the SEI shear storage modulus by over one order of magnitude in both cases. As a consequence, the ion diffusion coefficient and conductivity in the interphase is also significantly affected. While small quantities of VC in the initial electrolyte increase the SEI conductivity, FEC decomposition products hinder charge transport through the SEI and thus increase overall anode impedance significantly. </div>

Advanced ordered mesoporous carbon with fast Li-ion diffusion for lithium–selenium sulfide batteries in a carbonate-based electrolyte

Carbon ◽  
2020 ◽  
Vol 170 ◽  
pp. 236-244
Author(s):  
Wonhee Kim ◽  
Jiyeon Lee ◽  
Seungmin Lee ◽  
KwangSup Eom ◽  
Chanho Pak ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Ordered Mesoporous Carbon ◽  
Ion Diffusion ◽  
Ordered Mesoporous ◽  
Li Ion ◽  
Selenium Sulfide

scholarly journals Na-ion diffusion in a NASICON-type solid electrolyte: a density functional study

2016 ◽  
Vol 18 (39) ◽  
pp. 27226-27231 ◽  
Author(s):  
Kieu My Bui ◽  
Van An Dinh ◽  
Susumu Okada ◽  
Takahisa Ohno
Keyword(s):  
Density Functional Theory ◽  
Solid Electrolyte ◽  
Electronic Structures ◽  
Density Functional ◽  
Diffusion Mechanism ◽  
Functional Study ◽  
Ion Diffusion ◽  
Functional Theory ◽  
Density Functional Study ◽  
Nasicon Type

Based on density functional theory, we have systematically studied the crystal and electronic structures, and the diffusion mechanism of the NASICON-type solid electrolyte Na3Zr2Si2PO12.

Effect of Li Source on Charge/Discharge Performance of LiFePO4

2012 ◽  
Vol 509 ◽  
pp. 51-55
Author(s):  
Hong Quan Liu ◽  
Fei Xiang Hao ◽  
Yi Jie Gu ◽  
Yun Bo Chen
Keyword(s):  
Low Cost ◽  
Utilization Efficiency ◽  
Ion Diffusion ◽  
Diffusion Distance ◽  
Pore Characteristics ◽  
Discharge Performance ◽  
High Theoretical Capacity ◽  
Low Toxicity ◽  
Li Ion ◽  
Potential Plateau

LiFePO4 has been considered as the most promising positive electrode due to its low cost, high theoretical capacity, stability and low toxicity, all highly required in vehicle applications. In this work, LiFePO4 compound was synthesized by the solid carbothermic reduction reactions with different Li resource. The pure LiFePO4 phase was confirmed for all samples by analysis of the XRD results. The different morphologies were obtained due to different Li resources. The potential plateau of all samples is in the range from 3V to 4V. The sample (LiCO3 as the Li resource) has a higher discharge capacity of 118mAhg−1 at 0.2C 20% greater than that of the sample (LiOH as the Li resource). The reason comes maybe from nano pore characteristics, which reduce Li ion diffusion distance, and increase the utilization efficiency of material.

Synthesis and Electrochemical Properties of Spherical LiFePO4/C Composite via Spray Drying

2015 ◽  
Vol 1120-1121 ◽  
pp. 554-558 ◽  
Author(s):  
Juan Mei Wang ◽  
Bing Ren ◽  
Ying Lin Yan ◽  
Qing Zhang ◽  
Yan Wang
Keyword(s):  
Diffusion Coefficient ◽  
Electrochemical Properties ◽  
Spray Drying ◽  
Electrochemical Impedance ◽  
Retention Rate ◽  
Lithium Ion ◽  
Constant Current ◽  
Ion Diffusion ◽  
Electrochemical Tests ◽  
Li Ion

In this work, spherical LiFePO4/C composite had been synthesized by co-precipitation and spray drying method. The structure, morphology and electrochemical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM), transmission electron microscope (TEM), constant current charge-discharge tests and electrochemical impedance spectroscopy (EIS) tests. The spherical LiFePO4/C particles consisted of a number of smaller grains. The results showed that the morphology of LiFePO4/C particles seriously affected the Li-ion diffusion coefficient and electrochemical properties of lithium ion batteries. Electrochemical tests revealed the spherical LiFePO4/C composite had excellent Li-ion diffusion coefficient which was calculated to be 1.065×10-11 cm2/s and discharge capacity of 149 (0.1 C), 139 (0.2 C), 133 (0.5 C), 129 (1 C) and 124 mAhg-1(2 C). After 50 cycles, the capacity retention rate was still 93.5%.

Improved Li-ion diffusion process in TiO2/rGO anode for lithium-ion battery

2017 ◽  
Vol 727 ◽  
pp. 998-1005 ◽  
Author(s):  
Juan Li ◽  
Jianfeng Huang ◽  
Jiayin Li ◽  
Liyun Cao ◽  
Hui Qi ◽  
...  
Keyword(s):  
Diffusion Process ◽  
Lithium Ion Battery ◽  
Lithium Ion ◽  
Ion Diffusion ◽  
Li Ion
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