Results 221 to 230 of about 68,370 (266)

Pitfalls in Simulating the Diffusion Potential of Li-Ion Cells

ECS Meeting Abstracts, 2016
Variations of liquid-phase composition in electrochemical devices induce overpotentials referred to as ‘diffusion potential’ or ‘concentration potential’, which can have large effects for high current operation. Recently, an apparent discrepancy was observed in the electrochemical modelling literature when accounting for the effect of liquid-phase ...
Adrien Mathieu Bizeray, David Alastair Howey, Charles W Monroe   +2 more
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Modeling study of Li ion diffusion and microstructure of LiFePO4

Solid State Sciences, 2011
Abstract Molecular dynamics technique has been employed to investigate the relationship between the intrinsic structure and transport properties of lithium ions in LiFePO 4 cathode materials. The results show that it is more favorable for Li ion diffusion when crystalline LiFePO 4 grows along specific [100] directions, which may cause higher ...
Peixin Zhang, Dongyun Zhang, Qiuhua Yuan, Xiangzhong Ren, Teresa D. Golden   +4 more
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Enhanced Diffusion Kinetics of Li Ions in Double-Shell Hollow Carbon Fibers

ACS Applied Materials & Interfaces, 2021
The rational design and preparation of hierarchical hollow structures have promising potential in electrochemical energy storage systems. In this paper, double-shell hollow carbon fibers (DSHCFs) with tunable thickness and shell spacing are prepared using hollow electrospun polystyrene fibers as the hard template and in situ coated polypyrrole as the ...
Haipeng Liu, Wen Lei, Zhaoming Tong, Keke Guan, Quanli Jia, Shaowei Zhang, Haijun Zhang   +6 more
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Atomistic insights into Li-ion diffusion in amorphous silicon

Mechanics of Materials, 2015
Silicon has been critically examined for its potential use as an electrode material for Li-ion batteries. Diffusive transport of Li-ions in the crystalline silicon anode is one of the key mechanisms that controls the deformation during lithiation, the rate of the charge–discharge cycle, and eventual mechanical failure.
Xin Yan, Afif Gouissem, Pradeep Sharma
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First-principles investigation of Li ion diffusion in Li2FeSiO4

Solid State Ionics, 2013
We have studied the Li-ion migration and the electrochemical performance of Li2FeSiO4 in the monoclinic crystal structure with P2(1) symmetry and the related delithiated system LiFeSiO4.
Rafael B. Araujo, Ralph H. Scheicher, J.S. de Almeida, A. Ferreira da Silva, Rajeev Ahuja   +4 more
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Diffusion kinetics of water in graphite anodes for Li-ion batteries

Drying Technology, 2020
Since the loading of electrodes for Li-ion batteries with an excessive amount of moisture affects the performance of the cells, the moisture is partly removed in a post-drying process step.
Jochen C. Eser, Birthe Deichmann, Tobias Wirsching, Lisa Merklein, Marcus Müller, Philip Scharfer, Wilhelm Schabel   +6 more
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Diffusion of Li ion in glassy Li2O·B2O3 system

Solid State Ionics, 2002
Abstract The ionic migration in lithium borate glasses with various composition of molar ratio R ( R =0.15, 0.21, 0.33, 0.5, 0.7, 1 and 1.4) is studied by the conductivity and the nuclear magnetic resonance techniques. Four activation energies for Li ion migration characterizing these observed quantities, E σ determined from dc conductivity ...
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Phase-Field Simulation of Li-Ion Diffusion and Stress Evolution in Cathode Materials in NCA-Type Li-Ion Batteries

ECS Meeting Abstracts, 2020
The crack propagation in a positive electrode of lithium (Li)-ion batteries degrades the performance of Li-ion batteries. The crack propagation is driven by the Li intercalation- and deintercalation-induced stress-field in the electrode. In order to prevent the degradation of Li-ion battery performance, it is essential to understand the Li-ion ...
Akinori Yamanaka, Hajime Endo, Mitsunori Nakamoto, Kikou Yamaguchi, Hideyuki Kamisaka, Naoki Koshitani, Kazuaki Endo, Masato Yano, Masatomo Tanaka   +8 more
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Li ion diffusion in LiAlO 2 investigated by Raman spectroscopy

Solid State Sciences, 2014
Abstract The temperature dependence of Li ions behavior of γ -LiAlO 2 has been studied from 78 to 873 K. On heating, the Li ions underwent positional disordering along the structural channels, with the Li ions related modes at 220, 366 and 400 cm −1 broadening and weakening dramatically.
Qiwei Hu, Li Lei, Xiaodong Jiang, Zhe Chuan Feng, Mingjun Tang, Duanwei He   +5 more
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Diffusion of Li+ ions in concentrated solutions of LiNO3 in 1,3-diaminopropane

Journal of Solution Chemistry, 1997
The temperature and composition dependences of the self-diffusion coefficient of Li+ ions were investigated for concentrated solutions of LiNO3 in 1,3-diaminopropane by means of the NMR spin-echo technique from 20 to 50°C. The composition dependence of the activation energy shows a bend around 30 mol % LiNO3.
Hirokazu Hayashi, Yoshio Nakamura
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