Improved Li-ion diffusion and stability of a LiNi0.5Mn1.5O4 cathode through in situ co-doping with dual-metal cations and incorporation of a superionic conductor

2017 ◽  
Vol 5 (1) ◽  
pp. 145-154 ◽  
Author(s):  
Weijie Liu ◽  
Qiang Shi ◽  
Qunting Qu ◽  
Tian Gao ◽  
Guobin Zhu ◽  
...  
Keyword(s):  
Diffusion Rate ◽  
Rate Capability ◽  
Metal Cations ◽  
Superionic Conductor ◽  
Ion Diffusion ◽  
Co Doping ◽  
Lithium Diffusion ◽  
Li Ion ◽  
Dual Metal

Incorporation of the Li7La3Zr2O12 superionic conductor into LiNi0.5Mn1.5O4 greatly improves the intrinsic lithium diffusion rate and rate capability.

scholarly journals In situ surface-enhanced Raman spectroelectrochemistry reveals the molecular conformation of electrolyte additives in Li-ion batteries

2021 ◽  
Author(s):  
Chenbo Zhu ◽  
Chenghao Fan ◽  
Emiliano Cortes ◽  
Wei Xie
Keyword(s):  
Molecular Conformation ◽  
Rate Capability ◽  
Cycle Performance ◽  
Li Ion Batteries ◽  
Electrolyte Additive ◽  
Electrolyte Additives ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Li Ion

We report on the mechanism of rhodamine B (RhB) acting as an electrolyte additive in Li/graphite cells. We show that cycle performance and rate capability of graphite is enhanced in...

Layered-spinel capped nanotube assembled 3D Li-rich hierarchitectures for high performance Li-ion battery cathodes

2016 ◽  
Vol 4 (47) ◽  
pp. 18416-18425 ◽  
Author(s):  
Fu-Da Yu ◽  
Lan-Fang Que ◽  
Zhen-Bo Wang ◽  
Yin Zhang ◽  
Yuan Xue ◽  
...  
Keyword(s):  
High Performance ◽  
Diffusion Rate ◽  
Li Ion Batteries ◽  
Li Ion Battery ◽  
Cycle Stability ◽  
Ion Diffusion ◽  
Irreversible Capacity ◽  
Capacity Loss ◽  
Li Ion ◽  
Resultant Material

We report an effective approach to fabricate layered-spinel capped nanotube assembled 3D Li-rich hierarchitectures as a cathode material for Li-ion batteries. The resultant material exhibits a reduced first-cycle irreversible capacity loss, rapid Li-ion diffusion rate and excellent cycle stability.

Insights into the lithium diffusion process in a defect-containing porous crystalline POM@MOF anode material

2020 ◽  
Vol 49 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Peipei Zhu ◽  
Xiya Yang ◽  
Xiao Li ◽  
Ning Sheng ◽  
Haifeng Zhang ◽  
...  
Keyword(s):  
Diffusion Process ◽  
Anode Material ◽  
Storage Capacity ◽  
Ex Situ ◽  
Ion Diffusion ◽  
Defect Sites ◽  
Ion Storage ◽  
Lithium Diffusion ◽  
Li Ion

A crystalline POM@MOF material with high Li-ion storage capacity with surface uncoordinated N atoms (defect sites) is reported. The Li-ion diffusion sites are confirmed via ex situ XPS and off-line XRD measurements.

In-situ self-polymerization restriction to form core-shell LiFePO4/C nanocomposite with ultrafast rate capability for high-power Li-ion batteries

Nano Energy ◽  
2017 ◽  
Vol 39 ◽  
pp. 346-354 ◽  
Author(s):  
Hongbin Wang ◽  
Runwei Wang ◽  
Lijia Liu ◽  
Shang Jiang ◽  
Ling Ni ◽  
...  
Keyword(s):  
High Power ◽  
Rate Capability ◽  
Core Shell ◽  
Li Ion Batteries ◽  
Li Ion

“Hydrotriphylites” Li1-xFe1+x(PO4)1-y(OH)4y as Cathode Materials for Li-ion Batteries

2019 ◽  
Author(s):  
Vasily D. Sumanov ◽  
Dmitry A. Aksyonov ◽  
Oleg A. Drozhzhin ◽  
Igor A. Presniakov ◽  
Alexey V. Sobolev ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
Cathode Materials ◽  
Lithium Iron Phosphate ◽  
Renewable Energy Sources ◽  
Rate Capability ◽  
Iron Phosphate ◽  
Hydroxyl Groups ◽  
Ion Diffusion ◽  
Li Ion

Lithium iron phosphate LiFePO<sub>4</sub> triphylite is now one of the core positive electrode (cathode) materials enabling the Li-ion battery technology for stationary energy storage applications, which are important for broad implementation of the renewable energy sources. Despite the apparent simplicity of its crystal structure and chemical composition, LiFePO<sub>4</sub> is prone to off-stoichiometry and demonstrates rich defect chemistry owing to variations in the cation content and iron oxidation state, and to the redistribution of the cations and vacancies over two crystallographically distinct octahedral sites. The importance of the defects stems from their impact on the electrochemical performance, particularly on limiting the capacity and rate capability through blocking the Li ion diffusion along the channels of the olivine-type LiFePO<sub>4</sub> structure. Up to now the polyanionic (i.e. phosphate) sublattice has been considered idle on this playground. Here, we demonstrate that under hydrothermal conditions up to 16% of the phosphate groups can be replaced with hydroxyl groups yielding the Li<sub>1-x</sub>Fe<sub>1+x</sub>(PO<sub>4</sub>)<sub>1-y</sub>(OH)<sub>4y</sub> solid solutions, which we term “hydrotriphylites”. This substitution has tremendous effect on the chemical composition and crystal structure of the lithium iron phosphate causing abundant population of the Li-ion diffusion channels with the iron cations and off-center Li displacements due to their tighter bonding to oxygens. These perturbations trigger the formation of an acentric structure and increase the activation barriers for the Li-ion diffusion. The “hydrotriphylite”-type substitution also affects the magnetic properties by progressively lowering the Néel temperature. The off-stoichiometry caused by this substitution critically depends on the overall concentration of the precursors and reducing agent in the hydrothermal solutions, placing it among the most important parameters to control the chemical composition and defect concentration of the LiFePO<sub>4</sub>-based cathodes.

Exceptional lithium diffusion through porous aromatic framework (PAF) interlayers delivers high capacity and long-life lithium–sulfur batteries

2022 ◽  
Author(s):  
Ehsan Ghasemiestahbanati ◽  
Areeb Shehzad ◽  
Kristina Konstas ◽  
Caitlin J. Setter ◽  
Luke A. O'Dell ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
High Capacity ◽  
Ion Diffusion ◽  
Shuttle Effect ◽  
Porous Aromatic Framework ◽  
Porous Aromatic Frameworks ◽  
Lithium Sulfur Batteries ◽  
Lithium Diffusion ◽  
Residual Capacity ◽  
Li Ion

Sulfonated porous aromatic frameworks (SPAFs) accelerate Li-ion diffusion while retarding the polysulfide shuttle effect in Li–S batteries. This leads to high residual capacity above 1000 mA h g−1 and coulombic efficiency (>99.5%) after 500 cycles.

TiO2-B/Ag Nanocomposite Wires Enhanced Electrochemical Performance for Li-ion Batteries

2017 ◽  
Vol 20 (4) ◽  
pp. 183-188 ◽  
Author(s):  
Jinlong Wang ◽  
Kaixin Song ◽  
Changqing Tong ◽  
Guanglei Tian ◽  
Jun Wu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Diffusion Length ◽  
Rate Capability ◽  
Performance Tests ◽  
Performance Difference ◽  
Li Ion Batteries ◽  
Silver Particles ◽  
Ion Diffusion ◽  
Li Ion ◽  
Enhanced Electrochemical Performance

In this work, the pristine and Ag-composited TiO2-Bronze (TiO2-B) nanowires are successfully synthesized by hydrothermal method using anatase(P25) as titanium source. The SEM, TEM results reveal that the silver particles are well distributed on the TiO2-B nanowires. Also, the TiO2-B/Ag nanowires are dispersed very well, which demonstrate more Li-ion insertion/extraction hosts exposed to the electrolyte. Moreover, the electrochemical performance tests suggest that compared with the pristine TiO2-B, the Ag-composited TiO2-B (TiO2-B/Ag) shows remarkably higher capacities (~286mAhg-1, closing to the theoretical capacity) and superior rate capability. The reasons causing this performance difference are ascribed to the added silver particles, which could reduce the Li-ion diffusion length and improve the material electrical conductivity.

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